In industrial applications, inverters play a crucial role in motor speed control. Their performance directly affects system efficiency and reliability. The AnyHz (Anyi) FST-650 series inverter is widely used in fans, pumps, and compressors. Among its common faults, “Err13” is frequently encountered, indicating output phase loss. This article provides a comprehensive analysis of Err13, including its causes, diagnosis steps, parameter tuning, and long-term solutions.
2. Meaning of Err13
According to the official user manual and display panel codes:
Fault Code: Err13 Fault Description: Power output phase loss
“Output phase loss” means that the inverter detects one of the output phases (U, V, or W) is missing or the current is significantly abnormal, triggering a protective shutdown.
3. Common Causes of Err13
1. Loose or poor motor terminal connections
Caused by vibrations, poor tightening, corrosion, or wear, leading to poor contact on U/V/W terminals.
2. Damaged output cables
Aging insulation, rodents, mechanical stress, or improper bending could break one phase of the cable.
3. Motor winding failure
One phase of the stator coil is open due to burnout or manufacturing defects.
4. Inverter output module failure
The internal IGBT or current sensing circuit of the FST-650 is damaged, causing abnormal or missing output.
5. Output fuse blown (if used externally)
Some systems use fuses on each output phase. A blown fuse on one phase can cause Err13.
4. On-Site Troubleshooting Steps
Step 1: Confirm if it’s a false alarm
Use a clamp meter to measure U, V, W phase currents.
Use a multimeter to check motor winding resistance symmetry.
Step 2: Inspect output cables
Check all wiring terminals for secure connection and signs of overheating.
Inspect cable routing for physical damage or moisture ingress.
Step 3: Test motor condition
Use a megohmmeter to check insulation.
If possible, replace with another working motor to isolate the issue.
Step 4: Inspect inverter internals
Check IGBT module, driver board, and current sensors.
Observe for damaged components or abnormal heating.
5. Relevant Parameter Settings
The FST-650 inverter detects output phase loss via current monitoring and software logic. The following parameters affect phase loss detection:
Parameter No.
Name
Recommended Setting
Description
F9.10
Phase loss detection enable
1 (Enable)
Turns on the function
F9.11
Detection delay time
0.2–2.0s
Avoids false alarms
F2.10
Torque/current limit
≥110%
Avoids misjudgment as overcurrent
F0.17 / F0.18
Acceleration / deceleration time
10–30s
Prevents current overshoot
6. Repair Actions
1. Re-tighten U/V/W terminal screws
Ensure all output terminals are properly secured.
2. Replace or test output cable
Swap suspected cables with known good ones to isolate faults.
3. Test or replace the motor
If the motor is suspected, test with a known good motor and observe for recurrence.
4. Repair or replace inverter output module
If all external components are normal, the inverter’s power module or current sensor may need replacement.
7. Prevention and Maintenance Tips
Regular tightening of output terminals, especially in vibrating machinery.
Quarterly insulation testing of cables and motor windings.
Install output phase monitoring relay to detect early signs of failure.
Ensure proper cooling and dust protection for the inverter panel.
For critical systems, consider motor + encoder + phase monitor redundancy setup.
8. Conclusion
The Err13 “Output Phase Loss” fault on AnyHz FST-650 inverters is a critical protection mechanism that prevents motor damage. While often caused by external wiring or motor faults, internal inverter failures can also trigger this alarm. Systematic diagnosis and parameter adjustments, along with preventive maintenance, will greatly improve system uptime. If issues persist, consult with qualified service professionals or the manufacturer.
The Saice SES800III servo drive is a high-performance device widely used in industrial automation, delivering precise control in various applications. Despite its reliability, users may encounter fault codes during prolonged operation or under challenging conditions, with the A.83 fault code being a notable issue. This code specifically indicates a resolver signal failure, pointing to an anomaly in the feedback signal from the resolver, a critical sensor for monitoring motor rotor position. A resolver failure can compromise motor control accuracy and potentially halt system operations, causing significant production disruptions.
This article provides a comprehensive analysis of the A.83 fault, including its causes, detailed troubleshooting steps, and preventive measures. The goal is to equip users with practical, systematic guidance to resolve the issue efficiently and ensure long-term equipment stability.
Definition of the A.83 Fault
In the Saice SES800III servo drive, the A.83 fault code is designated to indicate a resolver signal failure. A resolver is a robust electromagnetic sensor mounted within the motor, designed to detect the rotor’s angular position and transmit this data to the drive for precise speed and position control. Compared to optical encoders, resolvers are preferred in industrial settings due to their resilience to high temperatures, vibrations, and contaminants.
When the resolver signal is interrupted, distorted, or otherwise abnormal, the drive detects the issue and triggers the A.83 fault code. This typically prompts the system to enter a protective mode, stopping the motor and displaying an alarm on the control panel or monitoring software.
Possible Causes of the A.83 Fault
The A.83 fault is typically linked to the resolver or its signal transmission path. Below are the common causes, spanning hardware, environmental, and installation factors:
1. Wiring Issues
Poor Contact: Loose connections between the resolver and drive due to prolonged vibration or improper installation can destabilize signal transmission.
Wiring Errors: Incorrect connections of signal lines (e.g., SIN, COS, EXC) to the wrong terminals during initial setup or maintenance can disrupt normal operation.
2. Damaged Signal Cables
Physical Damage: Cables may break, short-circuit, or lose insulation due to mechanical friction, compression, or external impacts.
Aging: In high-temperature, humid, or corrosive environments, cable insulation may degrade, reducing signal quality over time.
3. Resolver Failure
Internal Damage: Defects in the resolver’s coils, magnetic core, or other components, whether from manufacturing or wear, can lead to signal loss.
Misalignment: Improper alignment between the resolver and motor shaft can result in distorted position signals.
4. Environmental Factors
Temperature Extremes: Operating beyond the recommended temperature range (typically 0-40°C) can impair resolver performance.
Vibration Interference: Excessive mechanical vibration may loosen internal components or connections within the resolver.
Humidity Effects: High humidity (>90% RH) can cause short circuits or signal interference in electrical components.
5. Electromagnetic Interference (EMI)
Poor Grounding: Inadequate grounding of the drive or resolver can expose signals to external electromagnetic noise.
External Sources: Nearby high-power devices (e.g., inverters, motors, or radio equipment) may generate electromagnetic radiation that interferes with resolver signals.
Troubleshooting Steps
To quickly identify and resolve the A.83 fault, users should follow these systematic troubleshooting steps:
1. Inspect Wiring Integrity
Visual Check: Examine all connections between the resolver and drive, ensuring plugs are secure and free of looseness or detachment.
Electrical Testing: Use a multimeter to test the continuity of signal lines (SIN, COS, EXC) for open circuits or shorts.
Terminal Verification: Cross-check all connections against the equipment manual to rule out wiring errors.
2. Assess Signal Cable Condition
Visual Inspection: Look for signs of wear, breaks, or excessive bending in the signal cables, replacing damaged sections as needed.
Cable Routing: Ensure signal lines are routed away from power cables or interference sources, preferably using shielded cables.
3. Test Resolver Performance
Signal Analysis: Use an oscilloscope to check the SIN and COS signal waveforms, verifying amplitude, phase, and frequency against standards.
Replacement Test: Swap the suspected faulty resolver with a known good unit to determine if the issue lies with the resolver itself.
Alignment Adjustment: Check the resolver’s alignment with the motor shaft; recalibrate if misalignment is detected.
4. Improve Operating Environment
Temperature Control: Maintain the environment within the recommended temperature range, adding ventilation or cooling if necessary.
Vibration Reduction: Install vibration dampers on the equipment base or adjust the layout to minimize vibration.
Humidity Management: Use dehumidifiers in high-humidity settings to protect electrical components.
5. Mitigate Electromagnetic Interference
Grounding Optimization: Verify that the drive and resolver are properly grounded, with resistance meeting specifications.
Shielding: Add shielding to signal lines or use ferrite cores to suppress high-frequency interference.
6. Reset and Test the System
Fault Clearance: After repairs, reset the drive according to the manual (e.g., press the RST key) to clear the fault code.
Operational Verification: Run the motor in low-speed mode (e.g., set parameter Pr0.26=0) to confirm normal operation.
7. Seek Professional Support
If the issue persists after the above steps, it may indicate a complex internal fault in the drive or resolver. Contact Saice technical support or an authorized service center for advanced diagnosis.
Preventive Measures
To prevent the A.83 fault and enhance equipment reliability, consider the following proactive steps:
Regular Inspections: Conduct comprehensive checks of wiring, signal cables, and the resolver every 3-6 months to catch potential issues early.
Environmental Optimization: Keep the operating environment clean, dry, and at a stable temperature to avoid extreme conditions affecting the equipment.
Proper Installation: Adhere strictly to manual guidelines during installation and commissioning to ensure correct configuration of the resolver and drive.
Staff Training: Train operators and maintenance personnel on troubleshooting procedures and equipment care to improve response capabilities.
Conclusion
The A.83 fault (resolver signal failure) in the Saice SES800III servo drive is a critical issue requiring prompt attention. This guide offers a thorough breakdown of its causes, troubleshooting methods, and preventive strategies, enabling users to address the problem effectively and minimize downtime. Whether the fault stems from wiring issues, cable damage, or environmental factors, a systematic approach can resolve most cases. For complex scenarios, professional assistance from Saice is recommended. This resource aims to support users in maintaining stable, efficient operations over the long term.
In the field of modern industrial automation, Variable Frequency Drives (VFDs) are core devices for controlling the speed of AC motors and are widely used in industries such as fans, pumps, packaging machinery, and textile machinery. The Andap VCD-2000 series VFD is favored by users for its high efficiency, stability, and ease of use. However, during operation, the VFD may trigger various fault codes due to different reasons, with E-30 being a common one. This article will delve into the meaning of the E-30 fault code, explore its possible causes, and provide detailed troubleshooting and solutions to help users quickly restore the normal operation of the equipment.
_cuva
Overview of Andap VCD-2000 Series VFD
The Andap VCD-2000 series VFD is a high-performance vector control VFD launched by Andap. It employs highly intelligent IGBT modules and a 32-bit CPU dual-core processor, supporting current vector control technology to achieve precise torque and frequency regulation. This series of VFDs has the following characteristics:
High Efficiency and Energy Saving: By optimizing the Space Vector Pulse Width Modulation (SVPWM) modulation technology, it achieves efficient energy conversion and significant energy-saving effects.
Stable and Reliable: It supports sensorless vector control with a starting frequency range of 0.40Hz to 20.00Hz, adapting to various load requirements.
Versatile: It offers multiple control methods such as constant torque V/F curves and automatic torque boost, suitable for applications like fans, pumps, and textile machinery.
User-Friendly: Equipped with a simple operation panel, it supports various parameter settings and real-time monitoring, facilitating user operation and maintenance.
The VCD-2000 series is widely used in industrial scenarios such as constant pressure water supply, wire-cutting machines, and central air conditioning systems. However, even high-performance equipment may trigger fault codes due to external or internal factors, such as E-30.
The Role of VFD Fault Codes
VFD fault codes are an internal diagnostic system of the device, used to issue warnings to users when abnormal conditions are detected. These codes usually correspond to specific fault types, such as overcurrent, overvoltage, overheating, or module failure. By displaying fault codes, the VFD can:
Quickly Locate Problems: Help users or technicians identify the cause of the fault promptly.
Reduce Downtime: Shorten the troubleshooting and repair time through clear error prompts.
Protect Equipment: Trigger protection mechanisms to prevent the fault from escalating and protect the VFD and connected equipment.
For the Andap VCD-2000 series VFD, the E-30 fault code is closely related to the protection mechanism of the power module, indicating that the device has detected an abnormality that may cause serious damage.
Meaning of the E-30 Fault Code
The E-30 fault code represents “Module Drive Protection”. According to the provided documentation, E-30 is triggered when the VFD detects a possible short circuit during the power module drive process. The power module is the core component of the VFD, responsible for converting DC power to AC power to drive the motor. If a short circuit occurs within the module or in the external circuit, it may cause the module to overheat or be damaged. Therefore, the VFD will immediately stop operating and display the E-30 code.
Possible causes of “Module Drive Protection” triggering include:
Internal Short Circuit in the Power Module: Damage to IGBTs or other components within the module, leading to a short circuit.
External Circuit Short Circuit: Short circuits in the motor coil, connecting cables, or connectors.
Abnormal Drive Circuit: Signal abnormalities in the module drive circuit, leading to a false short circuit detection.
Troubleshooting and Solutions for E-30 Fault
When the Andap VCD-2000 series VFD displays the E-30 fault, users can follow these steps for troubleshooting and resolution:
Step 1: Check for Output Short Circuit
Operation: Disconnect the VFD from the load (motor) to ensure the VFD is in a no-load state.
Test: Attempt to start the VFD and observe if the E-30 fault still appears.
Judgment:
If the fault disappears, the problem may lie with the motor or the connecting circuit.
If the fault persists, the problem may be inside the VFD.
Note: Check the motor coil, cables, and connectors for signs of burning, damage, or poor insulation.
Step 2: Check the External Circuit
Operation: If the fault disappears in the no-load state, further check the external circuit.
Method:
Use a multimeter to measure the resistance of the motor coil to confirm if there is a short circuit.
Check the connecting cables for damage, aging, or insulation layer peeling.
Ensure the connectors are secure, with no looseness or corrosion.
Judgment:
If a short circuit is found, repair or replace the damaged components.
If the external circuit is normal, proceed to the next step.
Step 3: Test and Replace the Motor
Operation: Connect a known normal motor to the VFD.
Test: Start the VFD and observe if the E-30 fault still occurs.
Judgment:
If the fault disappears, the original motor may have problems and requires further inspection or replacement.
If the fault persists, the problem may be inside the VFD.
Step 4: Check the Internal Module of the VFD
Operation: If the above steps cannot solve the problem, check the power module inside the VFD.
Method:
Contact professional technicians or the Andap official service center to use professional equipment to detect the power module.
If the module is damaged, it may need to be replaced or the entire VFD may need to be replaced.
Note: The power module involves high-voltage circuits. Non-professional personnel should not attempt to disassemble or repair it to avoid electric shock or further damage to the equipment.
Step 5: Refer to the User Manual
Operation: Consult the user manual of the Andap VCD-2000 series VFD to find detailed descriptions of the E-30 fault.
Suggestion: The manual usually contains a fault code table and model-specific troubleshooting steps, which may provide additional parameter adjustment suggestions.
Step 6: Contact Technical Support
Operation: If the above steps cannot solve the problem, contact the company’s technical support or authorized service provider.
Provide Information:
VFD model (e.g., VCD2000-A2S0007B).
Fault code (E-30).
Operating conditions when the fault occurred (e.g., load type, ambient temperature).
Troubleshooting steps already attempted.
Reference: You can contact us for support.
_cuva
Preventive Measures for E-30 Fault
To reduce the occurrence of the E-30 fault, users can take the following preventive measures:
Regular Connection Checks: Inspect the motor and VFD connecting cables monthly to ensure no looseness, damage, or corrosion.
Maintain a Good Environment: Install the VFD in a dry, well-ventilated area, avoiding high temperatures (>40℃) or dusty environments.
Load Management: Ensure the motor power matches the VFD’s rated power to avoid overloading.
Regular Maintenance: Clean the heat sink, check the insulation performance, and update the firmware version according to the manufacturer’s recommendations.
Firmware Updates: Check for new firmware versions and upgrade to optimize protection mechanisms and performance.
Conclusion
The E-30 fault code of the Andap VCD-2000 series VFD indicates that the power module drive protection has been triggered, usually caused by internal or external short circuits. Through systematic troubleshooting, including checking for output short circuits, testing the motor, and inspecting the internal module, users can effectively locate the problem and take appropriate measures. Regular maintenance and proper use are key to preventing such faults and ensuring the long-term stable operation of the VFD. If the problem is complex, it is recommended to contact professional technical support promptly to avoid further damage to the equipment.
Fault Troubleshooting Flow Chart
Step
Operation
Judgment
Next Action
1. Check Output
Disconnect the load and start the VFD
Fault disappears: External problem; Fault persists: Internal problem
Check the motor and cables
2. Check External Circuit
Use a multimeter to check the motor and cables
Short circuit found: Repair; No short circuit: Continue
Replace and test the motor
3. Replace Motor
Connect a normal motor and start
Fault disappears: Original motor problem; Fault persists: VFD problem
Check the power module
4. Check Module
Contact professionals to detect the module
Module damaged: Replace; Module normal: Check the drive circuit
Contact technical support
5. Refer to Manual
View the user manual
Specific instructions found: Follow the suggestions
Variable Frequency Drives (VFDs), such as the Hope-130 series manufactured by Senlan, are critical components in modern industrial automation, enabling precise control of motor speed and energy efficiency. However, like any sophisticated equipment, VFDs are prone to faults that can disrupt operations if not addressed promptly. One such fault is the “Er.OLL” error code, which signals an overcurrent or overload condition. This article delves into the meaning of the Er.OLL fault, its potential causes, diagnostic methods, and step-by-step solutions to restore normal operation. By understanding this fault, operators can minimize downtime and maintain productivity in their facilities.
What Does the Er.OLL Fault Mean?
The “Er.OLL” fault code, as indicated on the Hope-130 VFD display, is an alarm triggered by the device’s protective mechanisms when it detects an overcurrent or overload situation. According to the technical manual for the Hope-130 series (referenced on Page 111), this fault, denoted as code 15, is associated with excessive current draw that exceeds the VFD’s rated capacity. Overcurrent can occur when the motor is subjected to a load beyond its design limits, or when electrical issues such as short circuits or insulation failures are present. The fault is designed to protect the VFD and connected motor from damage, but it requires immediate attention to identify and resolve the underlying issue.
Common Causes of the Er.OLL Fault
Several factors can contribute to the Er.OLL fault, ranging from mechanical to electrical and configuration-related issues. Understanding these causes is the first step toward effective troubleshooting:
Excessive Mechanical Load: If the motor is driving a machine with an unusually high load—such as a jammed conveyor belt or a pump handling blocked fluid—the current demand may spike, triggering the fault.
Short Circuit or Ground Fault: Damaged wiring, faulty insulation, or a short circuit between phases can cause an abrupt increase in current, leading to the Er.OLL alarm.
Incorrect VFD Parameter Settings: Misconfigured parameters, such as an improperly set current limit or acceleration/deceleration time, can cause the VFD to misinterpret normal operation as an overload.
Motor Issues: A motor with worn bearings, internal short circuits, or phase imbalances can draw excessive current, prompting the fault.
Power Supply Problems: Voltage fluctuations or an unstable power supply can lead to irregular current flows, potentially triggering the protective mechanism.
Diagnostic Approach
Diagnosing the Er.OLL fault requires a systematic approach to pinpoint the root cause. Here are the steps to follow:
Visual Inspection: Begin by checking the motor, wiring, and connected machinery for obvious signs of damage, such as burnt cables, loose connections, or mechanical blockages.
Review VFD Display and Logs: The Hope-130 VFD provides fault details on its display. Use the “MENU” and “ENTER” buttons to access fault history and current readings (e.g., A for amperage) to confirm the overcurrent condition.
Measure Electrical Parameters: Use a multimeter to check the input voltage and current drawn by the motor. Compare these values against the VFD’s rated specifications.
Inspect Motor Operation: Run the motor manually (if safe) to listen for unusual noises or vibrations that might indicate mechanical issues.
Check Parameter Settings: Access the VFD’s parameter menu to verify settings such as current limit, overload protection thresholds, and acceleration profiles.
Step-by-Step Solutions
Once the cause is identified, the following solutions can be applied to resolve the Er.OLL fault:
Address Mechanical Overload:
If a mechanical blockage is found (e.g., a jammed conveyor), stop the system, clear the obstruction, and restart the VFD.
Ensure the load matches the motor’s rated capacity. If the load is consistently high, consider upgrading to a more powerful motor or VFD.
Fix Electrical Faults:
Inspect all wiring for signs of damage or short circuits. Replace any faulty cables or connectors.
Test for ground faults using an insulation resistance tester. Repair or replace any components with compromised insulation.
Adjust VFD Parameters:
Access the VFD’s parameter settings via the control panel. Increase the acceleration/deceleration time to reduce the current spike during startup.
Adjust the current limit parameter to align with the motor’s rated current, ensuring it does not exceed the VFD’s capacity.
Service the Motor:
If the motor is faulty, disassemble it to check for worn bearings or internal short circuits. Lubricate or replace bearings as needed, and rewind or replace the motor if damage is extensive.
Balance the motor phases by checking the resistance of each winding with a multimeter.
Stabilize Power Supply:
Install a voltage stabilizer or UPS if power fluctuations are detected. Ensure the power source meets the VFD’s voltage requirements.
After implementing these fixes, reset the fault by pressing the “RESET” button on the VFD panel and attempt to restart the system. Monitor the operation to ensure the fault does not recur.
Preventive Measures
To avoid future Er.OLL faults, consider the following preventive strategies:
Regular Maintenance: Schedule routine inspections of the VFD, motor, and connected machinery to detect wear or damage early.
Proper Installation: Ensure the VFD and motor are installed according to the manufacturer’s guidelines, with adequate ventilation and secure wiring.
Training: Train operators to recognize early signs of overload or electrical issues and to use the VFD’s diagnostic features effectively.
Load Management: Avoid sudden load changes by implementing gradual startup procedures and ensuring machinery operates within design limits.
Conclusion
The Er.OLL fault in a Hope-130 VFD is a critical alert that demands prompt action to protect equipment and maintain operational efficiency. By understanding its meaning as an overcurrent or overload condition and systematically diagnosing its causes—whether mechanical, electrical, or configurational—operators can apply targeted solutions to resolve the issue. From clearing mechanical blockages to adjusting VFD parameters and servicing the motor, each step contributes to a robust resolution process. Moreover, adopting preventive measures can significantly reduce the likelihood of recurrence, ensuring long-term reliability. With proper care and attention, the Hope-130 VFD can continue to serve as a dependable asset in industrial applications, minimizing downtime and maximizing productivity.
Variable Frequency Drives (VFDs), commonly known as inverters, are essential components in modern industrial control systems. They regulate motor speed and performance to achieve energy efficiency and precise control. However, their complexity can lead to faults, which are often indicated by error codes on the inverter’s display. In the SUNYE CM530 and CM530H series inverters, ERR24 is a frequently encountered fault code, typically associated with an “output side phase error” or “output phase loss.” This article provides a comprehensive guide to understanding ERR24, identifying its causes, troubleshooting the issue, and implementing preventive measures to ensure reliable operation.
Understanding ERR24
The ERR24 fault code likely indicates that the inverter has detected an issue with the output side, specifically a phase sequence error or a missing phase in the three-phase output (U, V, W) to the motor. This disruption can prevent the motor from operating correctly, potentially causing equipment downtime or damage. The error suggests an imbalance in the current or voltage output, which is critical for maintaining stable motor performance. Addressing ERR24 promptly is vital to minimizing disruptions in industrial processes.
Possible Causes of ERR24
Several factors may trigger the ERR24 fault code. Based on common inverter issues and general electrical engineering principles, the following are the most likely causes:
Output Cable Issues
Cables connecting the inverter to the motor may become loose, damaged, or disconnected due to vibration, aging, or external factors, resulting in phase loss.
Insulation damage in cables can cause short circuits between phases or to ground, disrupting the phase sequence.
Motor-Related Problems
Internal motor windings may develop open circuits or short circuits due to overheating, aging, or voltage imbalances, leading to unbalanced phases.
Loose or disconnected motor terminal connections can also trigger ERR24.
Inverter Internal Faults
Internal components, such as Insulated Gate Bipolar Transistors (IGBTs) in the inverter’s output module, may fail due to overload or wear, causing phase sequence errors.
Faults in the control circuit or power board can also contribute to ERR24.
Environmental Factors
High dV/dt (voltage change rate) from Pulse Width Modulation (PWM) outputs can stress cable or motor insulation, leading to phase loss.
Long cable runs (over 50 meters) may require dV/dt or sine wave filters to mitigate voltage spikes.
System Configuration Issues
A mismatch between the inverter’s output capacity and the motor’s rated power can destabilize the phase sequence.
Excessive motor load or frequent start/stop cycles may also induce ERR24.
Troubleshooting ERR24
To resolve the ERR24 fault, follow these systematic steps to identify and address the root cause:
Inspect Output Cables
Verify that the U, V, W three-phase cables are securely connected, free from wear, breaks, or burn marks.
Use a multimeter to test cable continuity and check for open circuits or short circuits.
For cable runs exceeding 50 meters, consider installing dV/dt or sine wave filters to reduce voltage spikes.
Examine Motor Connections
Check that motor terminal connections are tight and secure, tightening them if necessary.
Measure the resistance of the motor’s three-phase windings (U1-V1, V1-W1, W1-U1) with a multimeter to ensure consistent values. Inconsistent readings may indicate a need for motor repair or replacement.
Check Inverter Internals
If cables and motor are intact, the issue may lie within the inverter, such as a faulty IGBT module or control circuit.
Contact SUNYE’s official after-sales service or a qualified technician to inspect internal components using specialized diagnostic tools.
Verify System Configuration
Ensure the inverter’s output capacity matches the motor’s rated power to prevent phase sequence issues.
Check for excessive motor load and adjust operating parameters or reduce start/stop frequency as needed.
Assess Environmental Factors
Confirm that cables meet VFD standards, such as XLPE insulation, and are properly grounded in metal conduits.
Evaluate the operating environment for high temperatures, humidity, or corrosive gases that could degrade cable or motor insulation.
Troubleshooting Steps Table
Step
Action
Tools/Notes
Inspect Output Cables
Check U, V, W cables for secure connections and damage
Contact professionals for internal module inspection
Requires specialized equipment; safety first
Verify Configuration
Match inverter capacity to motor; adjust load and parameters
Refer to user manual for settings
Assess Environment
Ensure VFD-standard cables and proper grounding; check environmental conditions
Use XLPE cables; avoid harsh environments
Preventive Measures
To minimize the occurrence of ERR24 faults, implement the following preventive strategies:
Regular Maintenance
Conduct routine inspections of output cables and motor connections to detect and address wear or looseness.
Perform preventive motor maintenance, including insulation testing, to identify potential issues early.
Proper Equipment Selection
Select an inverter with a capacity that matches the motor’s rated power to avoid compatibility issues.
Install dV/dt or sine wave filters for long cable runs to protect against voltage spikes.
Environmental Protection
Shield cables and motors from high temperatures, humidity, or corrosive environments.
Use VFD-compliant cables, such as XLPE-insulated cables, and ensure proper grounding.
Operational Monitoring
Leverage the inverter’s monitoring features to regularly check output current and voltage balance.
Address any detected anomalies promptly by adjusting parameters or seeking technical support.
Case Studies
The following real-world examples illustrate how ERR24 faults were diagnosed and resolved:
Case Study: Cable Insulation Failure In a manufacturing facility, a CM530H inverter displayed ERR24, and the motor failed to start. Technicians discovered that the cables connecting the inverter to the motor had deteriorated insulation due to prolonged use, causing a short circuit in one phase. Replacing the cables with new, properly grounded ones resolved the ERR24 fault, and the system resumed normal operation.
Case Study: Inverter Component Failure Another user reported persistent ERR24 errors despite normal cable and motor checks. A professional technician used diagnostic tools to identify a damaged IGBT module in the inverter, caused by overloading. Replacing the module and optimizing the load configuration eliminated the fault.
Conclusion
The ERR24 fault code on SUNYE CM530 and CM530H inverters likely indicates an output side phase sequence error or phase loss, potentially caused by issues with cables, motor windings, internal inverter components, or improper system configuration. By systematically inspecting cables, motor connections, inverter internals, and system settings, users can effectively diagnose and resolve the issue. Preventive measures, including regular maintenance, proper equipment selection, environmental protection, and operational monitoring, are essential to reducing ERR24 occurrences. For complex issues, refer to the SUNYE user manual, particularly Chapter 7, “Fault Diagnosis and Countermeasures,” or contact SUNYE’s official after-sales service for professional assistance. Addressing ERR24 promptly ensures equipment reliability and enhances industrial production efficiency.
In the field of industrial automation, Variable Frequency Drives (VFDs) are essential for controlling motor speed and torque. The Shihlin SS2 series inverter is widely recognized for its efficiency and reliability across various industrial applications. However, like any electronic device, it may encounter faults, one of which is the “ou0” fault—a common issue that can lead to downtime and affect productivity. This article provides an in-depth analysis of the “ou0” fault, its causes, and detailed solutions to help users restore normal operation swiftly.
What Is the “ou0” Fault?
The “ou0” fault code typically indicates that the inverter has detected an excessively high DC bus voltage, a condition known as overvoltage. The DC bus is a critical component in the inverter that converts AC input into DC before inversion. When the DC bus voltage exceeds the safety threshold, the inverter triggers a protective mechanism, displaying “ou0” and halting operation to prevent damage to internal components like the IGBT module. On the Shihlin SS2 inverter’s control panel, “ou0” is usually shown in red, accompanied by an abnormal status of the operation indicator light.
Common Causes of the “ou0” Fault
Overvoltage faults can stem from multiple factors, with the following being the most prevalent:
High Input Voltage If the AC input voltage exceeds the inverter’s rated range (typically 380V ±15%), the DC bus voltage rises accordingly. Grid fluctuations, poor power quality, or external disturbances like lightning strikes can contribute to this issue.
Regenerative Energy Feedback During motor deceleration, especially with high-inertia loads (e.g., CNC machines or heavy machinery), the motor can act as a generator, feeding energy back to the inverter. If the deceleration time is too short or there is no mechanism to dissipate this energy, the DC bus voltage spikes.
Component Aging or Failure DC bus capacitors play a vital role in absorbing and stabilizing voltage. Aging or damaged capacitors may fail to perform, leading to voltage fluctuations. Additionally, faults in the rectifier or inverter modules can also cause overvoltage.
Improper Parameter Settings A deceleration time set too short is a frequent misconfiguration, causing regenerative energy to accumulate rapidly. Other parameters, such as voltage regulation settings, may also impact voltage stability.
External Factors
Excessively long cables or degraded insulation can introduce voltage interference or leakage.
Environmental conditions like high temperatures or dust accumulation may affect the inverter’s cooling and performance.
Diagnosing the “ou0” Fault
To accurately identify the cause of the “ou0” fault, a systematic diagnostic approach is recommended:
Check Input Voltage Use a multimeter to measure the three-phase input voltage of the inverter, ensuring it falls within the Shihlin SS2 series’ rated range (typically 380V ±15%). If the voltage is too high or fluctuates significantly, investigate grid stability or external interference.
Review Deceleration Time Settings Access the inverter’s parameter settings through the control panel and check the deceleration time parameter (possibly P.02, as per the manual). If the deceleration time is too short (e.g., 2 seconds), consider extending it to 5 seconds or more to reduce regenerative energy buildup.
Inspect DC Bus Capacitors If possible, use a capacitance tester to measure the DC bus capacitors’ capacitance and equivalent series resistance (ESR). Aging capacitors may show reduced capacitance or physical damage (e.g., bulging or leakage). Replace them if necessary.
Evaluate Load Characteristics Determine if the load is high-inertia (e.g., heavy machinery or fans). High-inertia loads generate significant regenerative energy during deceleration, potentially requiring additional braking equipment.
Inspect Cables and Grounding Ensure the output cable length does not exceed the recommended limit (typically 50 meters) and check the cable insulation for integrity. Verify that the inverter is properly grounded to avoid electrical noise or static interference.
Use Diagnostic Tools If the inverter supports communication features, connect diagnostic software to view detailed fault logs. Record the operating condition during the fault (e.g., acceleration, deceleration, or constant speed) for further analysis.
Solutions
Based on the diagnosis, the following measures can resolve the “ou0” fault:
Adjust Deceleration Time Extending the deceleration time is a simple and effective way to address regenerative energy issues. Access the parameter settings via the control panel and adjust the deceleration time (e.g., P.02) from a short duration (like 2 seconds) to 5 seconds or longer, depending on the load characteristics.
Install a Braking System For high-inertia loads, installing a braking resistor and braking unit is highly recommended. The braking resistor dissipates excess regenerative energy as heat, preventing the DC bus voltage from rising beyond the protection threshold. Ensure the resistor matches the inverter model, as specified in the Shihlin SS2 manual.
Stabilize Input Voltage If the grid voltage is unstable, consider installing a voltage regulator or reactive power compensation device. A line reactor can also help filter high-order harmonics, improving power quality.
Replace Faulty Components If the capacitors or other internal components are damaged, they should be replaced by a qualified technician. Ensure the power is disconnected and safety protocols are followed during replacement.
Optimize Environmental Conditions Ensure the inverter is installed in a well-ventilated, temperature-controlled environment. Regularly clean the heat sink and fan to prevent dust buildup that could impair cooling.
Reset Parameters If parameter settings may be incorrect, reset the inverter to factory defaults (often by holding the “STOP/RESET” key while powering on, as per the manual). Reconfigure the necessary parameters afterward.
Preventive Measures
To prevent the recurrence of the “ou0” fault, consider the following:
Regular Maintenance: Inspect the inverter’s capacitors, connectors, and cooling system every 6-12 months to ensure optimal condition.
Monitor Power Quality: Use a power quality analyzer to periodically check the input voltage stability and address potential issues early.
Optimize Parameter Settings: Adjust acceleration and deceleration times to match the load characteristics, ensuring compatibility with the application.
Install Protective Equipment: In lightning-prone areas, install surge protection devices to safeguard the inverter from transient overvoltage.
Case Study
In a manufacturing plant, a Shihlin SS2 inverter controlling a CNC machine frequently reported the “ou0” fault during rapid deceleration. Technicians first measured the input voltage, confirming it was within 380V ±10%, ruling out power supply issues. They then reviewed the parameters and found the deceleration time set to 2 seconds, which was too short. After extending it to 5 seconds, the fault ceased. To further enhance reliability, the plant installed a braking resistor, effectively managing the regenerative energy from the high-inertia load. This case highlights the importance of proper parameter adjustments and hardware upgrades in resolving the “ou0” fault.
Conclusion
The “ou0” fault in the Shihlin SS2 inverter is typically an overvoltage issue caused by factors like input voltage anomalies, regenerative energy buildup, or component failure. Through systematic diagnosis (e.g., checking voltage, adjusting parameters, installing braking systems), users can effectively address the issue. Regular maintenance and optimized settings are key to preventing future faults. If the problem persists, professional technical support is advised to ensure safe and reliable operation.
Common Overvoltage Fault Codes and Solutions
Below is a summary of typical overvoltage faults in inverters for reference:
Fault Code
Description
Possible Causes
Solutions
OV1
Overvoltage during acceleration
High input voltage, short acceleration time
Extend acceleration time, check input voltage
OV2
Overvoltage at constant speed
Regenerative energy buildup, capacitor failure
Check capacitors, install braking unit
OV3
Overvoltage during deceleration
Short deceleration time, high-inertia load
Extend deceleration time, install braking resistor
In the field of industrial automation control, inverters, as the core equipment for motor speed regulation, are widely used in various scenarios requiring graded speed regulation, such as fans, pumps, and conveyor belts. This article will take the ZK880-N positive control inverter as an example, combined with official technical documentation and practical application scenarios, to elaborate in detail on how to achieve three-stage speed control through DI digital input terminals, providing systematic guidance from hardware wiring to parameter settings.
I. Technical Principles of Three-Stage Speed Control
The essence of three-stage speed control is to preset the motor operating frequency into three different levels through the multi-stage speed instruction function of the inverter. Users can select the corresponding frequency band through external switch signals to realize the graded regulation of motor speed. The ZK880-N inverter uses digital input terminals (DI) as the trigger signal source, combined with function code parameter settings, to build a flexible and reliable multi-stage speed control system.
II. Hardware Wiring Implementation Steps
1. Terminal Function Definition
According to control requirements, the DI1-DI3 digital input terminals need to be configured as multi-stage speed control ports. Refer to the inverter terminal distribution diagram, with standard wiring terminals located in the control circuit interface area.
2. Wiring Specifications
Power Connection: Ensure that the main circuit power supply (R/S/T) and control circuit power supply (usually +24V) of the inverter are correctly connected.
DI Terminal Wiring:
DI1: As the first-stage speed trigger terminal, it is recommended to connect a normally open contact switch.
DI2: As the second-stage speed trigger terminal.
DI3: As the third-stage speed trigger terminal.
Common Terminal (COM): The signal common terminal for all DI terminals, which should be connected to the other end of the switch.
3. Wiring Precautions
The switch signal voltage range must comply with the DI terminal input specifications (5-30V DC).
It is recommended to use shielded twisted pair cables for signal transmission to avoid electromagnetic interference.
After wiring, use a multimeter to detect the insulation resistance between terminals to ensure there is no short circuit.
III. Detailed Explanation of Core Parameter Settings
The following function codes need to be configured through the operation panel or dedicated software:
1. DI Terminal Function Mapping
Function Code
Parameter Item
Setting Value
Function Description
F4-00
DI1 Function Selection
4
Multi-stage Speed 1 (corresponding to the first-stage speed)
F4-01
DI2 Function Selection
5
Multi-stage Speed 2 (corresponding to the second-stage speed)
F4-02
DI3 Function Selection
6
Multi-stage Speed 3 (corresponding to the third-stage speed)
2. Multi-Stage Speed Frequency Settings
Function Code
Parameter Item
Setting Value
Typical Application Scenarios
FC-00
Multi-stage Speed 1 Frequency
20Hz
Light load start/low-speed operation
FC-01
Multi-stage Speed 2 Frequency
35Hz
Normal working speed
FC-02
Multi-stage Speed 3 Frequency
50Hz
High-speed discharge/emergency acceleration
3. Operating Parameter Configuration
Function Code
Parameter Item
Recommended Value
Function Description
F6-00
Acceleration Time 1
8.0s
Transition time from first-stage to second-stage speed
F6-01
Deceleration Time 1
5.0s
Transition time from second-stage to first-stage speed
F6-02
Acceleration Time 2
12.0s
Transition time from second-stage to third-stage speed
F6-03
Deceleration Time 2
8.0s
Transition time from third-stage to second-stage speed
FC-16
Operation Instruction Selection
1
Terminal control mode
FC-17
Fault Reset Selection
1
Allow DI terminals to perform fault reset
IV. Realization of Three-Stage Speed Control Logic
1. Single Terminal Single-Stage Speed Mode
Only DI1 is closed: The motor operates at the frequency set by FC-00 (20Hz).
Only DI2 is closed: The motor operates at the frequency set by FC-01 (35Hz).
Only DI3 is closed: The motor operates at the frequency set by FC-02 (50Hz).
2. Combined Control Mode (Advanced Application)
Through function codes FC-03 to FC-07, combined stage speeds can be set:
DI1+DI2 closed: Execute the frequency set by FC-03 (reserved for extended stage speed).
DI2+DI3 closed: Execute the frequency set by FC-04 (reserved for extended stage speed).
Special application scenarios: Realize automatic stage speed switching logic through PLC programming.
V. Commissioning and Verification Process
1. No-Load Test Stage
Disconnect the motor load and only retain the inverter and dummy load.
Close the DI1-DI3 switches in turn to observe whether the output frequency is consistent with the set value.
Use an oscilloscope to detect the output voltage waveform and confirm there is no distortion.
2. Load Commissioning Stage
Gradually load to the rated load.
Test the current impact during stage speed switching (should be less than 1.5 times the rated current).
Verify whether the acceleration/deceleration time meets the process requirements.
3. Abnormal Handling Test
Simulate DI terminal signal adhesion fault.
Verify the effectiveness of the FC-17 fault reset function.
Test the reliability of overload protection (OL) action.
VI. Typical Application Cases
In a certain water plant’s constant pressure water supply system, the three-stage speed control of the ZK880-N inverter is adopted:
First-stage speed (25Hz): Maintain the basic pressure of the pipe network during night low-peak periods.
Second-stage speed (40Hz): Meet normal water demand during daytime water supply.
Third-stage speed (50Hz): Quickly supplement the pipe network pressure during peak water consumption periods.
Through the automatic switching of stage speeds by pressure sensor signals, an energy-saving rate of 32% is achieved, and the pressure fluctuation range is controlled within ±0.02MPa.
VII. Maintenance and Optimization Suggestions
Regularly check the reliability of DI terminal wiring, and recommend tightening every six months.
Recheck the FC-00 to FC-02 parameter settings every quarter according to load characteristics.
Upgrade to the latest firmware version (currently V2.13) to obtain an optimized stage speed switching algorithm.
For impact loads, it is recommended to add an input reactor to improve power quality.
By following the above systematic implementation steps, users can efficiently achieve the three-stage speed control function of the ZK880-N inverter. In practical applications, it is necessary to combine specific process requirements and optimize parameters to achieve the best control effect. With the development of Industry 4.0, this inverter supports the Modbus-RTU communication protocol and can be integrated with the host computer system to achieve more intelligent stage speed scheduling management.
Inverters are vital components in industrial automation, enabling precise control over motor speed and torque across various sectors, including manufacturing and energy. The Shihlin SS2 series inverter, manufactured by Shihlin Electric, is widely recognized for its reliability and performance. However, like any complex equipment, it may encounter faults during operation. One such issue is the E0 fault, which can be perplexing for users due to its specific triggering conditions. This article provides a comprehensive analysis of the E0 fault in the Shihlin SS2 inverter, detailing its meaning, causes, solutions, and preventive measures to assist users in restoring normal operation efficiently.
1. Meaning of the E0 Fault
According to the Shihlin SS2 Series Inverter Manual (version V1.07), the E0 fault is triggered under specific conditions related to the inverter’s parameter settings and operation mode. Specifically, when parameter P.75 (stop function setting) is set to 1, and the inverter is operating in a mode other than PU (panel operation mode) or H2 (high-frequency mode), pressing the stop button (labeled as “(20) key” in the manual) for 1.0 second causes the inverter to stop. The display shows “E0,” and all functions are disabled or reset. This behavior acts as a protective mechanism to prevent unintended operation or potential damage under these conditions.
Interestingly, the manual also lists E0 in the fault code table under “00(H00)” as “no fault” (无异常), which may indicate a different context, such as a default or reset state in fault logging. This dual reference suggests that E0’s meaning depends on the operational context, but the primary focus here is its association with the stop function and parameter P.75.
2. Causes of the E0 Fault
To effectively resolve the E0 fault, understanding its causes is essential. Based on the manual and related information, the following are the primary reasons for the E0 fault:
Parameter P.75 Configuration: Parameter P.75 governs the inverter’s stop behavior. When set to 1, it enables a deceleration stop function. In non-PU or non-H2 modes, pressing the stop button for 1 second triggers the E0 fault, as the inverter interprets this as an invalid operation under the current settings.
Operation Mode Restrictions: The E0 fault is specific to non-PU and non-H2 modes. PU mode allows direct control via the inverter’s control panel, while H2 mode may relate to specific high-frequency applications. Operating in external control mode (e.g., via external signals) with P.75 set to 1 increases the likelihood of triggering E0.
External STE/STR Command Interference: External start/stop commands (STE/STR) can conflict with the inverter’s settings. The manual notes that when E0 occurs, these external commands are canceled, suggesting that signal interference may contribute to the fault.
Operator Error: Inadvertently pressing the stop button for more than 1 second in an incompatible mode can trigger the E0 fault. This is particularly common during initial setup, debugging, or when operators are unfamiliar with the inverter’s operation.
It’s worth noting that earlier versions of the Shihlin SS2 manual (e.g., V1.01) describe E0 as a communication error related to parity check issues. This discrepancy indicates that fault code definitions may have evolved across manual versions, with V1.07 providing the most relevant information for modern SS2 inverters.
3. Solutions for the E0 Fault
Resolving the E0 fault involves a systematic approach to eliminate its triggers and restore normal operation. The following steps, derived from the manual (version V1.07), are recommended:
Cancel External STE/STR Commands:
Inspect the inverter for any external start/stop (STE/STR) signals that may be interfering with its operation.
Cancel these inputs to ensure no external commands conflict with the inverter’s settings. In program operation mode, manual signals typically do not require clearing, but verifying the absence of interference is critical.
Reset the Inverter:
Locate the stop button (labeled “(20) key”) on the control panel.
Press and hold it for at least 1.0 second to clear the E0 fault and reset the inverter to an operational state. This is a direct method recommended in the manual.
Check and Adjust Parameter P.75:
Access the inverter’s parameter setting menu to review the value of P.75.
If P.75 is set to 1 and this is not suitable for your application, change it to 0 (the factory default) or another appropriate value. Refer to section 5.33 of the manual for detailed guidance on adjusting P.75.
Verify Operation Mode:
Ensure the inverter is operating in the correct mode (PU or H2, if required for your application).
Switch to the appropriate mode to prevent the fault from recurring.
Perform a Parameter Reset:
If the above steps do not resolve the issue, use parameters P.996 or P.997 to reset the inverter. These parameters can clear fault records or restore factory settings, as outlined in sections 5.78 and 5.80 of the manual.
Seek Professional Assistance:
Persistent faults may indicate hardware issues (e.g., faulty motherboard or wiring errors) or complex configuration problems.
Contact Shihlin Electric’s technical support team via their official website or arrange for the inverter to be inspected by the manufacturer.
The following table summarizes the causes and solutions for the E0 fault:
Possible Cause
Solution
P.75 set to 1, non-PU/H2 mode operation
Adjust P.75 to 0 or other values (manual section 5.33)
Stop button pressed for 1.0 second
Press stop button for 1.0 second to reset
External STE/STR command interference
Cancel external commands, check wiring
Hardware or configuration issues
Reset using P.996/P.997 or contact manufacturer
4. Preventive Measures for E0 Fault
To minimize the occurrence of E0 faults and ensure reliable inverter operation, consider the following preventive measures:
Proper Parameter Configuration:
During installation and commissioning, thoroughly review the Shihlin SS2 Series Inverter Manual (version V1.07) to ensure parameters like P.75 are correctly set for your application.
Avoid modifying parameters without understanding their functions to prevent unintended faults.
Regular Maintenance:
Conduct periodic inspections of the inverter’s wiring, cooling system, and control panel to check for loose connections, dust buildup, or overheating.
Regular maintenance reduces the risk of faults caused by environmental or mechanical issues.
Operator Training:
Train all personnel operating the SS2 inverter on its proper use and fault-handling procedures.
Ensure the manual is readily available for quick reference during operation or troubleshooting.
Power Supply Stability:
Use voltage stabilizers or surge protectors to protect the inverter from power fluctuations, which can contribute to faults.
A stable power supply is essential for long-term reliability.
Fault Monitoring and Logging:
Maintain a record of all fault occurrences, including their conditions and resolutions.
Regularly monitor the inverter’s performance to identify and address potential issues early.
5. Conclusion
The E0 fault in the Shihlin SS2 inverter, while initially confusing, can be effectively managed by understanding its association with parameter P.75 and specific operation modes. By following the outlined steps—canceling external STE/STR commands, resetting the inverter, adjusting P.75, and verifying the operation mode—users can typically resolve the fault quickly. Additionally, adopting preventive measures such as proper parameter setup, regular maintenance, operator training, power protection, and fault monitoring can significantly reduce the likelihood of E0 faults. For persistent issues, contacting Shihlin Electric’s technical support or arranging professional inspection is advisable. By implementing these strategies, users can ensure the stable and efficient operation of their SS2 inverters, maximizing performance in industrial applications.
Constant pressure water supply technology is widely used in modern industrial and civil water systems for efficient and energy-saving operation. This project uses the Milan M5000 inverter as the control core, combined with the YTZ-150 potentiometric remote pressure gauge, to construct a closed-loop constant pressure control system. It enables automatic adjustment of a single water pump to ensure the outlet pressure remains stable within the set range.
The system features low cost, easy maintenance, and fast response, making it suitable for small water supply systems, factory cooling water circulation, boiler water replenishment, and more.
2. Main Hardware and Functional Modules
1. Inverter: Milan M5000 Series
Built-in PID controller
Supports multiple analog inputs (0-10V, 0-5V, 4-20mA)
Provides +10V power output terminal for sensor power supply
Rated working voltage ≤6V, but 10VDC tested in practice with stable long-term operation
Outputs a voltage signal (typically 0–5V) varying with pressure via a voltage divider principle
3. Control Objective
Adjust pump speed using the inverter to maintain constant pipe pressure
Increase frequency when pressure drops, and decrease when pressure exceeds the setpoint to save energy
3. Wiring and Jumper Settings
1. 3-Wire Sensor Wiring (Tested with 10V)
Sensor Wire
Function
Inverter Terminal
Red
+10V supply
Connect to +10V
Green
Ground (GND)
Connect to GND
Yellow
Signal output
Connect to VC1 input
2. Analog Input Jumper JP8
Default: 1–2 connected, indicating 0–10V input
Keep the default setting in this project (no need to switch to 2–3)
4. PID Parameter Settings (Based on Field Use)
Parameter
Description
Value
Note
P7.00
Enable closed-loop control
1
Enable PID control
P7.01
Setpoint source
0
Digital input from panel
P7.02
Feedback source
0
VC1 analog input (0–10V)
P7.05
Target pressure value (%)
30.0
Corresponds to 0.3MPa if P7.24=1.000
P7.07
Feedback gain
1.00
Linear scaling factor for feedback
P7.10
PID control structure
1
Proportional + integral control
P7.11
Proportional gain
0.50
Recommended initial value
P7.12
Integral time constant
10.0
In seconds
P7.24
Pressure sensor range (MPa)
1.000
1.000 MPa full-scale
P1.19
Maximum voltage input
5.00
Matched to 0–5V signal range
5. Sleep Function Configuration
To enable energy saving when there is no pressure demand, the inverter can be configured to sleep:
Parameter
Description
Value
Note
P7.19
Wake-up threshold
0.001
Minimum pressure to resume operation (MPa)
P7.20
Sleep threshold
1.000
Enter sleep mode above this value (MPa)
P7.23
Constant pressure mode
1
One-pump control mode
6. PID Tuning Guidelines
After starting the system, observe pressure fluctuations:
If large oscillations, reduce P7.11 (proportional gain)
If sluggish response, reduce P7.12 (integral time)
Aim to maintain output pressure within ±2% of the P7.05 set value
Ensure return pipes have damping to prevent sudden pressure spikes
7. Key Considerations
Keep JP8 jumper at default 1–2 for 0–10V input
YTZ-150 sensor has been tested with 10V power supply and works stably
Ensure proper grounding (PE terminal) to avoid PID interference from common-mode noise
If feedback signal is noisy, add a filter capacitor (0.1–0.47μF) between VC1 and GND
8. Conclusion
With this design, the Milan M5000 inverter combined with the YTZ-150 pressure sensor delivers a cost-effective and reliable constant pressure control solution for water systems. The inverter’s built-in PID control simplifies implementation compared to external PLCs and offers strong performance with minimal tuning. As long as power supply, signal matching, and grounding are properly managed, the system achieves excellent closed-loop control stability.
The Delixi EM60 series inverter is a robust variable frequency drive (VFD) designed to regulate the speed and torque of AC motors in industrial applications. Engineered for reliability, it features advanced protective mechanisms to safeguard both the inverter and the connected motor. One such protection is the “quick current limit,” which prevents damage from sudden overcurrent conditions. However, when this limit is exceeded for too long, the inverter triggers the ERR34 fault code, known as “quick current limit timeout” (快速限流超时). This article explores the meaning of the ERR34 fault, its potential causes, and provides a detailed guide on how to troubleshoot and repair this issue, drawing on the Delixi EM60 series user manual and practical VFD maintenance principles.
What Does ERR34 Mean?
The ERR34 fault code indicates that the inverter’s output current has surpassed the quick current limit threshold for a duration exceeding the specified timeout period. In the Delixi EM60 series, this protective feature is part of the motor control strategy, managed through parameters in the P1 group (pages 31-73 of the user manual). The quick current limit activates during transient overcurrent events—such as sudden load spikes or short circuits—by reducing the output frequency or voltage to stabilize the current. If the current remains high beyond the timeout threshold (typically a few seconds), the inverter halts operation and displays ERR34 to prevent damage.
This fault serves as a critical alert, signaling that the system could not resolve an overcurrent condition within the allotted time. Understanding its implications is key to diagnosing whether the issue lies in the motor, wiring, parameters, or the inverter itself.
Potential Causes of ERR34
Several factors can trigger the ERR34 fault. Based on the manual’s fault diagnosis section (pages 191-199) and general VFD operation, the following are the most likely culprits:
Motor Overload Excessive mechanical load, such as a jammed rotor or heavy machinery, forces the motor to draw more current than the inverter can safely handle, activating the current limit.
Incorrect Parameter Settings Misconfigured settings in the P1 group (motor control parameters, pages 31-73) or P3 group (programmable functions, pages 47-117), such as a low current limit or short timeout period, can cause the fault to trigger prematurely.
Power Supply Instability Voltage fluctuations, harmonics, or transients in the input power can disrupt the inverter’s ability to regulate current, as emphasized in the safety guidelines (pages 6-7).
Wiring Issues Loose connections, damaged cables, or short circuits between the inverter and motor can lead to abnormal current spikes. The manual’s installation section (page 213) highlights the importance of secure wiring.
Motor or Inverter Faults Internal motor issues (e.g., shorted windings) or inverter hardware failures (e.g., damaged IGBT modules or current sensors) can sustain overcurrent conditions.
Environmental Factors Dust accumulation or poor ventilation, as observed in the image of an EM60G0R7S2 inverter, can overheat the unit, exacerbating current-related problems.
Troubleshooting the ERR34 Fault
Diagnosing the ERR34 fault requires a systematic approach. The following steps, inspired by the manual’s troubleshooting sections (pages 56-128) and practical experience, will help identify the root cause:
Ensure Safety Disconnect the power supply and verify with a multimeter that the system is de-energized, adhering to the caution label warning against live servicing.
Check Motor Load Inspect the motor and driven equipment for mechanical issues like binding or overloading. Measure the current draw with a clamp meter and compare it to the motor’s rated capacity.
Review Parameter Settings Use the inverter’s keypad (featuring “MODE,” “ENTER,” and arrow buttons) to access the P1 group. Verify the current limit (e.g., P1-03) and acceleration/deceleration times (P1-09, P1-10, page 159). Adjust if they are too restrictive for the application.
Inspect Wiring Examine all connections between the inverter and motor for looseness, fraying, or burn marks. Test for continuity and insulation resistance to rule out shorts.
Assess Power Supply Measure the input voltage to ensure it’s within the specified range (e.g., 380V ± 15% for three-phase models). Use a power quality analyzer to detect noise or surges.
Monitor Environmental Conditions Check the inverter’s surroundings for dust or high temperatures (recommended range: 0-40°C). Clean the unit and ensure proper ventilation.
Reset and Test After addressing potential issues, reset the fault via the “STOP” button or power cycle (page 128). Run the system at a low speed to observe if ERR34 reoccurs.
Solutions and Repairs
Once the cause is pinpointed, apply these solutions:
Reduce Overload Lighten the mechanical load or upgrade to a higher-capacity motor and inverter if the demand exceeds specifications.
Adjust Parameters Increase the current limit or extend the timeout period in the P1 group to accommodate normal operation. For example, lengthening acceleration time (P1-09) can reduce startup current spikes.
Stabilize Power Install a voltage stabilizer or harmonic filter to ensure consistent input power.
Repair Wiring Tighten connections or replace faulty cables, ensuring compliance with the manual’s wiring guidelines (page 213).
Fix Hardware
Motor: Test windings with an insulation tester; repair or replace if defective.
Inverter: If internal components are suspected (e.g., IGBTs), consult Delixi support for repair, as detailed diagnostics may require proprietary tools (P8 group, page 66).
Improve Environment Relocate the inverter to a cleaner, cooler area or add cooling fans to mitigate thermal stress.
Preventive Measures
To avoid future ERR34 faults:
Conduct regular maintenance on the motor and machinery to prevent overloads.
Periodically review P1 and P3 group settings, adjusting for changes in load or application (pages 31-117).
Install surge protectors to safeguard against power issues.
Clean the inverter routinely to remove dust, as recommended in the safety sections (pages 6-7).
Train staff on parameter configuration and fault handling, leveraging the manual’s application cases (pages 180-183).
Conclusion
The ERR34 fault code in the Delixi EM60 series inverter is a vital safeguard against prolonged overcurrent conditions. Whether caused by overload, parameter errors, wiring faults, or environmental factors, this issue can be resolved through careful troubleshooting and targeted repairs. By following the steps outlined and adhering to the user manual’s guidance, users can restore functionality and enhance system reliability. For complex hardware failures, professional assistance from Delixi or a certified technician ensures long-term performance and safety.
