Category: Electrical Equipment Manuals

In the field of industrial automation, inverters play a crucial role in driving motors and optimizing energy efficiency. The Toshiba VF-PS1 series is known for its reliability and versatility across a wide range of applications such as manufacturing, HVAC systems, and water treatment. However, during a recent on-site startup, an unusual issue occurred: the inverter powered up and the screen continuously displayed “ELL0”, while all indicator LEDs on the operation panel (RUN, Hz, %, MODE, EASY, etc.) were fully lit and unresponsive. The device failed to transition to its normal frequency display or any operational mode.

This article analyzes this abnormal behavior in depth, including its possible causes, technical diagnostics, and step-by-step troubleshooting solutions based on real-world experience. It aims to provide valuable insight for field engineers and maintenance professionals dealing with Toshiba VF-PS1 inverters.

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1. Interpreting the “ELL0” Message

The first observation is that the code “ELL0” is not listed in the VF-PS1 manual’s error or alarm code tables. Most standard error codes for Toshiba inverters follow formats like E-xx (e.g., E-10 for analog input error, E-11 for sequence error) or Errx (e.g., Err4 for CPU fault).

Given this, “ELL0” is not a known error code but likely a simplified or stylized display of a word. Considering the limitations of seven-segment or basic LCD panels, the letter “H” may be rendered as “E”, resulting in the word “HELLO” being shown as “ELL0.”

In fact, several other Toshiba inverter series such as VF-S15 are documented to display “HELLO” during startup as a friendly greeting. While VF-PS1 manuals do not explicitly mention this, it is highly plausible that “ELL0” is simply the inverter saying “HELLO” at startup.

✅ Conclusion: “ELL0” is not an error, but a startup message indicating the inverter is initializing.

However, this message is only meant to appear for a few seconds. If the inverter remains stuck on this screen for an extended time, and the display does not change to frequency output, “STOP,” or any other active status, then the system is failing to complete its initialization sequence.

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2. Why Are All the LEDs Constantly Lit?

Electronic devices often illuminate all LEDs during the power-on self-test (POST) to confirm the panel is functional. The VF-PS1 has multiple LEDs on its keypad including RUN, Hz, %, MODE, and EASY.

In a normal power-up, these LEDs briefly flash and then only relevant indicators remain lit based on status:

• In standby: only Hz and power indicators
• In run mode: RUN LED is lit
• During fault: alarm LED or fault code appears

⚠️ If all LEDs remain lit indefinitely, this suggests the system has not successfully exited the boot process. When combined with a stuck “ELL0” display, it is a clear sign the inverter is failing to transition to operational state.

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3. Possible Technical Causes of the Fault

After analyzing the inverter’s architecture and behavior, the following are the most probable causes for this issue:

1. Main Control Board (CPU) Failure

The control board houses the CPU, EEPROM, and firmware that drive the entire system. If any of these components fail (e.g., due to static discharge, aging, memory corruption), the inverter may not proceed past startup, effectively freezing on the “HELLO” message.

2. Internal Control Power Supply Instability

Toshiba inverters typically generate low-voltage DC internally (e.g., 5V or 24V) to power logic and display. If these voltages are unstable due to aged capacitors or faulty switching circuits, the system may repeatedly attempt to initialize and fail each time.

3. Operator Panel Communication Failure

The panel communicates with the inverter’s main board through a connector or internal bus. If this link is disrupted—due to loose cables, damaged connectors, or panel PCB faults—the display might not receive valid data and remain stuck at its default state.

4. External Expansion Modules Interfering

If optional communication or I/O modules (e.g., Profibus, DeviceNet, or analog expansion) are connected and one of them malfunctions, it may prevent the system from passing its full self-test. This can effectively freeze the inverter before entering active status.

5. Corrupt Parameters or Firmware

Sudden power loss during write operations or faulty parameter resets may corrupt memory. If the inverter firmware or configuration table cannot initialize correctly, the inverter may hang during startup without even reporting an error.

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4. Troubleshooting Steps and Solutions

The following field-tested steps may help restore the inverter to normal operation:

Step 1: Perform a Full Power Reset

• Power off the inverter completely
• Wait at least 15 minutes to allow internal capacitors to discharge
• Re-energize and observe whether the display changes from “ELL0” to frequency display or run status

Step 2: Inspect the Panel Connection

• If the keypad is external, check cable integrity and re-seat connections
• If it’s an internal panel, check the physical contact to the main board
• A faulty keypad may need replacement

Step 3: Remove Optional Modules

• Disconnect any communication modules, expansion I/O boards, or external terminals
• Reboot the inverter in minimal configuration
• If the device initializes successfully, one of the peripherals is likely faulty

Step 4: Check Power Input and Control Voltage

• Measure voltage at R/S/T terminals; confirm it’s within rated range and phase-balanced
• If possible, measure internal low-voltage DC power (e.g., 5V or 24V) on the control board to ensure stability

Step 5: Attempt Parameter Initialization (if possible)

• If the panel becomes responsive after reboot, consider resetting parameters to factory defaults
• This may clear out any corrupt settings

Step 6: Consider Control Board Replacement

• If none of the above steps restore operation, it’s likely the control board is faulty
• Repair or replacement of the control PCB is required
• Only qualified technicians should attempt internal board-level diagnostics

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5. Preventive Measures

To avoid similar issues in the future:

• Avoid frequent rapid power cycling, which can corrupt firmware or cause startup errors
• Use surge protection and voltage stabilizers to ensure clean input power
• Periodically inspect cooling fans and capacitors, which degrade over time
• Only perform parameter resets under safe, powered-down conditions

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6. Final Thoughts

While the appearance of “ELL0” on a Toshiba VF-PS1 inverter display might seem alarming at first, it is not inherently a fault code, but rather a welcome message (“HELLO”) that appears during power-up.

However, if the inverter remains stuck on “ELL0” and all panel LEDs stay on, it indicates a serious problem—typically that the inverter failed to complete its startup self-test. Common causes include CPU failure, unstable internal power, communication breakdown with the panel, or peripheral errors.

Technicians are advised to follow a structured troubleshooting process, starting with simple checks and escalating to control board diagnostics if necessary. If the issue persists and the inverter cannot be brought into operational state, professional service intervention or control board replacement is the likely solution.

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Goal: make the MT 500 drive’s LED keypad show actual motor speed in r/min (RPM).
Assumptions: drive is stopped, control source = keypad.

1 . Enter the parameter list (“Standard menu”)

Action	Expected display	Comment
Press ESC repeatedly from the normal monitor screen	‑bSC‑	“Basic / Standard menu” root
Press ENTER	P00.00	You are now at the parameter index level

Tip: ESC moves up one level; ENTER confirms / goes down.

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2 . Fill in the motor name‑plate data

(needed so the drive can translate Hz → RPM correctly)

2‑a  Locate P11.05 Rated frequency

1. While P00.00 is shown:
   • Press SHIFT until the left‑most digit blinks.
   • Tap UP until that digit becomes 1 → display reads P10.00.
   • Press SHIFT once to move the cursor to the last digit; UP once → P11.00.
   • Tap UP five more times → P11.05.
2. Press ENTER – the current value (e.g. 50.00) blinks.

2‑b  Edit the value

• Use SHIFT to select the digit; UP / DOWN to change it.
• Press ENTER to save. Display flashes End, then returns to P11.05. 

2‑c  Repeat for P11.06 Rated speed

• Navigate to P11.06 the same way; enter the motor’s rated RPM; ENTER to save. 

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3 . (Optional) Run auto‑tune P11.10

Action	Display
Go to P11.10, ENTER	value blinks (default 0)
UP → 1 (stand‑still tune) or 2 (rotating tune)
ENTER to store → End	Auto‑tune will start the first time you press RUN afterwards

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4 . Switch the display unit from Hz to RPM — P21.17

Action	Expected display
Press ESC twice to get back to P00.00; jump to P21.17	P21.17
ENTER – value blinks (0 = Hz)
UP once → 1 (= RPM)
ENTER to save → End	The Hz and A LEDs now light together, meaning the keypad shows RPM

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5 . See the live speed

1. Press ESC until the normal monitor screen returns.
2. The default monitored variable is r27.00. Because P21.17 = 1, its value is already in RPM. 
3. Press SHIFT (>>) to step through other view pages if needed; the Hz + A LEDs confirm the unit remains RPM.

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6 . (Optional) Show only speed on the monitor page

If you dislike the rotating multi‑page display:

1. Navigate to P21.11 (run‑mode sequence) and set it to 0001.
2. Do the same for P21.12 (stop‑mode sequence) if desired.

Now the keypad will lock onto a single page that shows r27.00 in RPM.

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Quick trouble‑shooting

Symptom	Likely cause	Fix
Still shows Hz	P21.17 not saved, or you are viewing another variable	Re‑enter 1; check Hz+A LEDs
RPM reading off by a lot	Wrong name‑plate data or no auto‑tune	Re‑check P11.05 / P11.06, run P11.10
Cannot enter parameters	User lock active	Enter password in P00.00 or restore defaults

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Ultra‑short recap

1. ESC → ‑bSC‑ → ENTER → parameter list.
2. Set P11.05 (rated Hz) & P11.06 (rated rpm).
3. (Option) P11.10 = 1 or 2, auto‑tune after RUN.
4. P21.17 = 1 → units = RPM.
5. Monitor page now shows real speed; enjoy!

The TD9000 series inverter, developed by SZOR Shenzhen Delta, is a high-performance, highly stable general-purpose drive. It is widely used in applications such as fans, pumps, conveyors, and machine tools. This article introduces the key functions of the TD9000 inverter, including the control panel, password settings, parameter restrictions, parameter initialization, terminal control wiring, potentiometer speed adjustment, and fault diagnostics. It aims to help users operate and maintain the TD9000 series more efficiently and safely.

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1. Control Panel Functions

The TD9000 inverter features an LED digital display and keypad panel. Key functions include:

• RUN: Starts the inverter.
• STOP/RESET: Stops operation or resets a fault.
• PROG: Enters or exits the parameter menu.
• DATA/ENTER: Confirms parameter modifications.
• ▲/▼: Scrolls through parameters or adjusts values.

The panel displays parameter codes, output frequency, current, voltage, and other running data. It also supports copy functions to clone parameters from one drive to another, making batch configuration fast and convenient.

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2. Password Setup and Parameter Access Restrictions

To prevent unauthorized changes, the TD9000 offers password protection and access-level control.

1. Set Password

• Parameter P00.08:
  • Set to 0000: No password protection.
  • Set to a 4-digit code (e.g., 1234): Enables password protection.

2. Remove Password

• If the password is forgotten, hold down special key combinations (e.g., PROG + STOP) during power-up or access maintenance mode to reset it (should be done by qualified personnel).

3. Parameter Access Restriction

• P00.07: Limits access to basic parameter groups only.
• P00.12 = 1: Activates user-access mode to restrict changes to key parameters.

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3. Restoring Factory Settings

To initialize all parameters:

• Set P00.13 = 1 to restore factory defaults. The inverter will reboot automatically. Use with caution, as all settings will be erased.

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4. Terminal Forward/Reverse Control & External Potentiometer Speed Adjustment

The TD9000 supports terminal-based control and analog input via external potentiometers.

1. Forward/Reverse Terminal Wiring

• Terminals:
  • S1: Forward run command (default).
  • S2: Reverse run command (customizable).
  • COM: Common ground.
• Parameter Settings:
  • F00.06 = 2 (terminal control mode).
  • F10.00 = 1 (S1 = Forward).
  • F10.01 = 2 (S2 = Reverse).

Closing the respective terminal switch triggers forward or reverse operation.

2. Potentiometer Speed Control Wiring

• Wiring:
  • 10V: Power supply to potentiometer.
  • AI1: Signal input from potentiometer center tap.
  • GND: Ground.
• Parameters:
  • F00.05 = 1 (set AI1 as frequency reference).
  • Fine-tuning via F11.00 ~ F11.02.

Adjusting the potentiometer varies the output frequency for smooth speed control.

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5. Fault Codes and Troubleshooting

TD9000 has advanced fault diagnostics. Faults are displayed as “ErrXX” codes on the panel.

Code	Meaning	Causes	Solution
Err01	Overcurrent	Short circuit, too short accel time	Check wiring, increase accel time
Err02	Overvoltage	Grid surge, braking circuit issues	Install brake resistor, adjust voltage
Err04	Overload	Heavy load, frequent starts/stops	Reduce load, optimize control sequence
Err05	Overheat	Fan failure, high ambient temp	Clean fan, improve ventilation
Err08	Communication error	Poor RS485 wiring or parameter mismatch	Check communication settings and wiring
Err09	Input phase loss	Missing phase, grid imbalance	Check power input and phase integrity
Err10	Output phase loss	Broken cable or terminal loose	Inspect output wiring and motor leads

Press STOP/RESET or cycle power to clear most transient faults. If faults persist, consult service engineers.

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6. Conclusion and Best Practices

The TD9000 inverter series is versatile and user-friendly. Key suggestions for optimal use:

• Backup parameters regularly.
• Assign user-level passwords.
• Ensure proper cooling and dust-free environment.
• Follow all safety and wiring instructions in the manual.

By following this guide, users can effectively configure and troubleshoot the TD9000 inverter series for reliable industrial performance.

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Introduction

The JLS Inverter E Series is a high-performance motor control device widely used in industrial automation. Its user manual provides comprehensive guidance on installation, configuration, and maintenance, enabling users to operate the inverter efficiently. This article, based on the manual, offers a detailed guide on the operation panel functions, terminal-based forward/reverse control, external potentiometer frequency adjustment, and common fault codes with their solutions. The goal is to provide users with a practical and thorough reference for utilizing the JLS Inverter E Series effectively.

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1. Operation Panel Functions

The operation panel is the primary interface for interacting with the JLS Inverter E Series, allowing users to configure parameters, monitor operations, and diagnose faults. Below is an overview of its key functions and usage instructions.

1.1 Display and Function Buttons

• Display Screen: The LCD screen displays real-time information such as parameter values, operating frequency, output current, and fault codes. It supports multiple language options for user convenience.
• Function Buttons:
  • PRG/ENTER Key: Enters parameter programming mode or confirms parameter changes.
  • Up/Down Keys (▲/▼): Navigate through parameter lists or adjust parameter values.
  • Left/Right Keys (◄/►): Switch between parameter groups or move the cursor during parameter editing.
  • RUN Key: Starts the inverter, initiating motor operation.
  • STOP/RESET Key: Stops the inverter or resets it during a fault condition.
• DIP Switch: Located inside the operation panel, used to set parameter access restrictions.

1.2 Restoring Factory Settings

To reset the inverter to its default configuration, follow these steps to restore factory settings:

1. Press the PRG/ENTER Key to enter programming mode.
2. Use the ▲/▼ Keys to select the parameter group “F0” (Basic Function Group).
3. Use the ◄/► Keys to locate parameter “F0.00” (Restore Factory Settings).
4. Set “F0.00” to “1” (indicating a factory reset).
5. Press the PRG/ENTER Key to confirm.
6. The inverter will restart automatically, restoring all parameters to their factory defaults.

1.3 Setting and Clearing Passwords

To prevent unauthorized parameter modifications, the inverter supports password protection. Below are the steps to set and clear a password:

• Setting a Password:
  1. Enter programming mode by pressing the PRG/ENTER Key.
  2. Select the “F0” parameter group.
  3. Navigate to parameter “F0.01” (Password Setting).
  4. Enter a 4-digit password (e.g., “1234”).
  5. Press the PRG/ENTER Key to save the password.
• Clearing a Password:
  1. Enter programming mode.
  2. Input the current password to unlock parameter access.
  3. Navigate to parameter “F0.01”.
  4. Set “F0.01” to “0” (to disable the password).
  5. Press the PRG/ENTER Key to confirm.

1.4 Parameter Access Restrictions

Parameter access can be restricted using the DIP switch inside the operation panel. Follow these steps:

1. Open the operation panel to access the internal DIP switch.
2. Set the switch position based on the desired access level:
   • Position 1 (ON): Allows access to all parameters.
   • Position 2 (OFF): Restricts access to advanced parameters, allowing only basic parameters to be modified.
3. Close the panel and restart the inverter to apply the settings.

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2. Terminal-Based Forward/Reverse Control and External Potentiometer Frequency Adjustment

The JLS Inverter E Series supports motor forward/reverse control via terminals and frequency adjustment using an external potentiometer. Below are the detailed steps for implementation.

2.1 Wiring Configuration

• Forward/Reverse Control:
  • Connect an external switch or PLC output to the inverter’s “FWD” (forward) and “REV” (reverse) terminals.
  • Connect the control signal’s common terminal to the “COM” terminal.
• External Potentiometer Frequency Adjustment:
  • Connect the potentiometer’s middle tap to the “AI1” terminal (Analog Input 1).
  • Connect the potentiometer’s two ends to the “+10V” (power supply) and “GND” (ground) terminals.

2.2 Parameter Settings

• Forward/Reverse Control:
  1. Enter programming mode.
  2. Select parameter group “F1” (Operation Control Group).
  3. Set “F1.00” (Operation Command Source) to “1” (Terminal Control).
  4. Set “F1.01” (Forward Control) to “0” (FWD terminal controls forward rotation).
  5. Set “F1.02” (Reverse Control) to “1” (REV terminal controls reverse rotation).
• External Potentiometer Frequency Adjustment:
  1. Enter programming mode.
  2. Select parameter group “F2” (Frequency Setting Group).
  3. Set “F2.00” (Frequency Reference Source) to “2” (AI1 Analog Input).
  4. Based on the potentiometer’s characteristics, configure parameters “F2.01” (AI1 Minimum Input) to “F2.04” (AI1 Maximum Input) to calibrate the frequency range.
     • Example: Set “F2.01” to 0V corresponding to 0Hz and “F2.04” to 10V corresponding to 50Hz.

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3. Fault Codes and Troubleshooting

The JLS Inverter E Series manual lists common fault codes and their troubleshooting methods. Below are typical faults and their solutions:

• E001: Overcurrent Fault
  • Cause: Excessive motor load, overly short acceleration time, or output short circuit.
  • Solution:
    • Check and reduce motor load.
    • Extend acceleration time (adjust parameter “F3.01”).
    • Inspect output wiring to ensure no short circuits.
• E002: Overvoltage Fault
  • Cause: High supply voltage, overly short deceleration time, or faulty braking resistor.
  • Solution:
    • Verify power supply voltage stability.
    • Extend deceleration time (adjust parameter “F3.02”).
    • Check the braking resistor for damage or poor connection.
• E003: Undervoltage Fault
  • Cause: Low supply voltage or poor wiring connections.
  • Solution:
    • Ensure the power supply voltage is within the specified range.
    • Check wiring connections for secure contacts.
• E004: Overheat Fault
  • Cause: Poor heat dissipation, high ambient temperature, or faulty fan.
  • Solution:
    • Improve ventilation to enhance heat dissipation.
    • Reduce ambient temperature.
    • Inspect fan operation and replace if necessary.
• E005: Motor Overload
  • Cause: Excessive load or incorrect motor parameter settings.
  • Solution:
    • Reduce motor load.
    • Verify that motor parameters match the actual motor specifications.

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Conclusion

The JLS Inverter E Series is a versatile and robust solution for industrial motor control, offering flexible configuration options and reliable performance. Mastering the user manual’s instructions is critical for ensuring stable operation and extending the equipment’s lifespan. This article has provided a comprehensive guide to the operation panel functions, terminal control setup, and fault troubleshooting, serving as a practical reference for users. In practice, adhere strictly to the manual’s guidelines and perform regular maintenance to ensure the inverter’s safety and reliability.

Introduction

A Variable Frequency Drive (VFD) is an electronic device that controls the speed of an AC motor by adjusting the power supply’s frequency and voltage. It is widely used in industrial automation, energy management, and mechanical equipment control. The Yuxin L Series Inverter is a high-performance product known for its reliability and user-friendliness. This guide provides detailed instructions on using the inverter, covering the operation panel functions, terminal-based forward/reverse control, external potentiometer frequency adjustment, fault codes, and troubleshooting methods. The aim is to help users quickly master the device and utilize it effectively.

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Part 1: Operation Panel Functions

The operation panel is the primary interface for interacting with the Yuxin L Series Inverter, enabling parameter configuration, status monitoring, and fault resetting. This section details the panel’s functionalities and specific settings.

1.1 Panel Layout and Button Functions

The Yuxin L Series Inverter’s operation panel typically features an LCD display and several function buttons. The display shows operational status, parameter numbers, parameter values, and fault codes. Common buttons and their functions include:

• MENU/ESC: Enter or exit the parameter setting menu.
• UP/DOWN: Navigate the menu or adjust parameter values.
• ENTER: Confirm selections or save parameter settings.
• RUN: Start the inverter’s operation.
• STOP/RESET: Stop the inverter or reset a fault condition.

Users are advised to familiarize themselves with the panel layout and refer to the manual’s panel diagram to ensure accurate operation.

1.2 Restoring Factory Settings

In cases such as incorrect parameter configurations or the need for reinitialization, restoring the inverter to factory settings may be necessary. Follow these steps:

1. Press the MENU/ESC button to access the main menu.
2. Use the UP/DOWN buttons to locate the “Parameter Management” or similar option (refer to the manual for the exact name).
3. Press ENTER to enter the submenu.
4. Select the “Restore Factory Settings” option.
5. Press ENTER to confirm. The inverter will reset all parameters to their default values.
6. Wait for the display to indicate completion, typically taking a few seconds.

Note: Restoring factory settings will erase all custom parameters. Back up important data beforehand.

1.3 Setting and Clearing a Password

To prevent unauthorized parameter changes, the Yuxin L Series Inverter supports password protection. Below are the steps to set and clear a password:

Setting a Password

1. Navigate to the “Parameter Management” menu.
2. Locate the “Password Setting” option.
3. Press ENTER and input a 4-digit password (e.g., “1234”).
4. Press ENTER to save. The password will take effect.
5. The next time you access parameter settings, the password will be required.

Clearing a Password

1. Enter the “Password Setting” menu.
2. Input the current password for verification.
3. Set the password value to “0000” or leave it blank (check the manual for specifics).
4. Press ENTER to save, and the password will be cleared.

Tip: If you forget the password, restoring factory settings may be required, but this will also reset other parameters.

1.4 Parameter Access Restrictions

Parameter access restrictions allow locking specific parameters to prevent accidental or unauthorized modifications. The process is as follows:

1. Access the “Parameter Management” menu.
2. Select the “Parameter Lock” or similar option.
3. Specify the parameter group to lock (e.g., advanced parameters or specific function parameters).
4. Set the lock status (typically “1” for locked, “0” for unlocked).
5. Press ENTER to save.
6. If a password is set, it will be required to modify locked parameters.

This feature allows flexible control over parameter accessibility, ensuring safe operation.

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Part 2: Terminal-Based Forward/Reverse Control and External Potentiometer Frequency Adjustment

The Yuxin L Series Inverter supports terminal-based control and frequency adjustment, enabling precise motor control. This section explains how to implement forward/reverse control and frequency adjustment using an external potentiometer, including wiring and parameter settings.

2.1 Terminal-Based Forward/Reverse Control

Terminal-based forward/reverse control is a common method for applications requiring external switches or PLC control.

Wiring Method

• Connect the forward switch to the digital input terminal DI1 and the common terminal COM.
• Connect the reverse switch to the digital input terminal DI2 and the common terminal COM.
• Ensure secure connections and refer to the manual’s terminal layout diagram to confirm terminal positions.

Parameter Settings

1. Set parameter P0.01 (Control Mode) to “1” to select terminal control mode.
2. Set parameter P4.00 (DI1 Function) to “1” to designate DI1 as the forward run command.
3. Set parameter P4.01 (DI2 Function) to “2” to designate DI2 as the reverse run command.
4. Save the settings. Closing the DI1 switch initiates forward rotation, and closing the DI2 switch initiates reverse rotation.

Note: Parameter numbers may vary by model. Refer to the manual’s parameter table for accuracy.

2.2 External Potentiometer Frequency Adjustment

Using an external potentiometer for frequency adjustment allows smooth speed control, ideal for applications requiring manual adjustments.

Wiring Method

• Connect the potentiometer’s center tap to the analog input terminal AI1.
• Connect one end of the potentiometer to the +10V terminal (provides reference voltage).
• Connect the other end to the GND terminal (ground).
• Use an appropriate potentiometer (typically 10kΩ) and ensure correct wiring.

Parameter Settings

1. Set parameter P0.03 (Frequency Reference Source) to “2” to select analog input AI1 for frequency setting.
2. Verify parameter P4.10 (AI1 Input Range) matches the potentiometer’s voltage range (typically 0-10V).
3. Save the settings. Rotating the potentiometer adjusts the output frequency.

Tip: If the frequency adjustment range is not as expected, adjust related parameters (e.g., maximum frequency P0.11).

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Part 3: Fault Codes and Troubleshooting

During operation, the inverter may encounter faults, displayed as fault codes on the screen. This section lists common fault codes and their solutions, but refer to the manual’s fault list for specific codes.

3.1 Common Fault Codes and Solutions

• E001: Overcurrent
  • Possible Causes: Excessive motor load, short acceleration time, or incorrect motor wiring.
  • Solutions:
    1. Check motor wiring for short circuits or poor connections.
    2. Reduce the load or increase the acceleration time (parameter P0.12).
    3. Restart the inverter to check if the issue resolves.
• E002: Overvoltage
  • Possible Causes: High input voltage, short deceleration time, or braking unit failure.
  • Solutions:
    1. Verify the power supply voltage is within the specified range.
    2. Extend the deceleration time (parameter P0.13).
    3. If frequent, check the braking resistor for proper function.
• E003: Undervoltage
  • Possible Causes: Low power supply voltage or unstable power.
  • Solutions:
    1. Ensure the input power voltage is stable.
    2. For multiple devices, confirm adequate power supply capacity.
• E004: Motor Overload
  • Possible Causes: Excessive load or incorrect motor parameter settings.
  • Solutions:
    1. Reduce the load or select a motor with higher power capacity.
    2. Verify motor parameters (P1 group) match the actual motor.
• E005: Inverter Overheating
  • Possible Causes: High ambient temperature or blocked/faulty cooling fan.
  • Solutions:
    1. Improve ventilation and reduce ambient temperature.
    2. Clean the fan and heatsink to ensure proper cooling.

3.2 General Troubleshooting Steps

1. Record the fault code and consult the manual for its specific meaning.
2. Inspect wiring, power supply, and load conditions to rule out external issues.
3. Press STOP/RESET to attempt a reset. If unsuccessful, power cycle the inverter.
4. If the issue persists, contact technical support with detailed fault information.

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Conclusion

The Yuxin L Series Inverter offers robust functionality and flexible configuration, making it an excellent choice for motor control applications. This guide has detailed the operation panel’s usage, terminal-based control and frequency adjustment methods, and fault troubleshooting procedures. Due to model variations and application complexity, users should always refer to the official Yuxin L Series Inverter Manual for precise details. By mastering these foundational skills, you can fully leverage the inverter’s capabilities, enhance equipment efficiency, and address potential issues promptly.

I. Fault Phenomenon and Definition

ERR04 is a common fault code for the Ruishen RCP600 series inverter during operation, indicating a constant speed overcurrent issue. This fault is triggered when the inverter detects that the output current continuously exceeds 150% to 200% of the rated value during the constant speed stage (non-acceleration/deceleration process). The fault phenomena include:

• Display of “ERR04” or “Constant Speed Overcurrent” alarm on the inverter panel.
• Equipment shutdown protection, possibly accompanied by abnormal noise or motor overheating.
• The fault can be reset for brief operation but tends to recur.

This fault directly affects the continuous operation capability of the equipment and requires systematic troubleshooting from three aspects: electrical parameters, mechanical load, and hardware status.

II. Fault Cause Analysis and Diagnostic Process

1. Classification of Core Causes

Category	Specific Causes
Parameter Settings	Mismatch of motor parameters (e.g., rated current, number of poles), over-aggressive PID tuning, excessive torque compensation
Load Anomalies	Mechanical jamming, sudden load changes (e.g., drive mechanism failure), increased resistance due to motor bearing damage
Electrical Faults	Output side short circuit/ground fault, cable insulation aging, current detection circuit anomalies (e.g., Hall sensor drift or damage)
Cooling Issues	Poor heat dissipation leading to degraded IGBT module performance and reduced carrier capability

2. Scientific Diagnostic Process

Step 1 – On-site Observation and Data Recording

• Record the operating frequency, current value, and DC bus voltage (readable via the panel’s U0 parameter group) at the time of fault occurrence.
• Check for abnormal noises, temperature rise, or visible mechanical damage in the motor and mechanical load.

Step 2 – Distinguishing Between Load-Side and Electrical-Side Faults

• Disconnect the motor load and run the inverter under no load: If ERR04 disappears, the issue is on the load side; if it persists, check electrical parameters and hardware.
• Use a megohmmeter to test the motor winding insulation to ground (requirement: ≥5MΩ) to rule out ground faults.

Step 3 – Parameter Verification and Waveform Analysis

• Verify the motor nameplate parameters and check if the P0 group (basic parameters) and A2 group (motor parameters) settings match the actual motor.
• Observe the output current waveform for distortions (e.g., excessive harmonics) using an oscilloscope or the inverter’s built-in waveform recording function.

III. Targeted Solutions

1. Parameter Optimization and Adjustment

• Motor Self-Learning: Perform the inverter’s “Motor Parameter Auto-Tuning” (refer to the PA group function in the manual) to ensure stator resistance and inductance values match the actual motor.
• Reduce Torque Compensation: Adjust the P2-21 parameter (constant speed torque compensation coefficient) and gradually reduce it to 80% to 100% for testing.
• PID Parameter Reset: If PID control is applied, reset the PA-03 (proportional gain) and PA-04 (integral time) to their default values to avoid over-tuning.

2. Load-Side Fault Handling

• Mechanical System Inspection: Check coupling alignment, bearing lubrication, and belt tension to eliminate jamming points.
• Load Matching Verification: Ensure the motor power matches the mechanical load to avoid long-term overload operation. For example, a 22kW motor driving a 30kW load requires an upgraded inverter and motor combination.

3. Electrical Hardware Maintenance

• Output Side Insulation Test: Use a 500V megohmmeter to measure the U/V/W terminal insulation to ground. If <5MΩ, replace the motor cable or repair the winding.
• Current Detection Calibration:
  • Check for loose Hall sensor connections.
  • Recalibrate the current detection accuracy using the AC-20 to AC-27 parameters (analog calibration parameters), with a tolerance deviation within ±2%.
• Cooling System Maintenance: Clean the air duct dust, test the cooling fan operation (set temperature threshold via P8-47), and replace aged fans if necessary.

4. Advanced Debugging Techniques

• Carrier Frequency Adjustment: Reduce the carrier frequency in the A5-01 parameter (PWM modulation method) (e.g., from 12kHz to 8kHz) to reduce switching losses and temperature rise.
• Overcurrent Stall Suppression: Enable the P3-19 (overcurrent stall control) and P3-20 (suppression intensity) parameters, setting the action current to 130% to 150% of the rated value.

IV. Preventive Maintenance Recommendations

1. Regular Parameter Backup: Utilize the inverter’s “User Parameter Backup” function (P7 group) to save optimized parameters and prevent失调due to accidental resets.
2. Hardware Inspection Regimen:
   • Quarterly inspection of output terminal tightness to prevent increased contact resistance.
   • Annual thermal imaging scan of IGBT modules and rectifier bridges to address abnormal temperature rise points.
3. Load Monitoring: Install mechanical vibration sensors and current trend recorders for early fault warnings.

V. Maintenance Case Reference

Case Background: An RCP600-22kW inverter for an injection molding machine frequently reported ERR04, operating normally under no load but triggering the fault after 10 minutes under load.

Troubleshooting Process:

• No-load current was 12A (normal), but under load, it rose to 48A (rated current 42A).
• Motor insulation test was normal, but disassembly revealed rusted and jammed reducer bearings.
• After replacing the bearings and adjusting the P2-21 parameter (torque compensation) from 150% to 110%, the fault was resolved.

VI. Summary

Resolving the ERR04 fault requires a three-tiered troubleshooting approach focusing on “parameters, load, and hardware,” combined with real-time data and equipment status analysis. The key is to distinguish between transient overcurrent and sustained overload, avoiding unnecessary component replacements. Through scientific debugging processes and preventive maintenance, the stability of the inverter system can be significantly improved, reducing the risk of unplanned downtime.

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I. Operation Panel Functions and Basic Settings

1. Operation Panel Function Introduction

• Key Functions:
  • RUN Key: Starts the VFD operation; requires configuration of the operation command channel.
  • STOP/RESET Key: Stops the device during operation or resets alarms during fault states.
  • PRG Key: Enters the parameter editing menu, supporting three-level menu navigation (Function Group → Function Code → Parameter Value).
  • Direction Keys (▲/▼): Switches between displayed parameters or adjusts values, supporting cyclic selection and bit modification.
  • FUN Key: Can be customized for jog operation or forward/reverse switching (configured via F7.03).
• Display Area:
  • 5-Digit LED Display: Shows operating frequency, fault codes, parameter values, etc.
  • Status Indicators: Include operating status (RUN/TUNE), forward/reverse (FWD/REV), local/remote control (LOCAL/REMOTE), and fault (TRIP) indicators.

2. Restoring Factory Default Settings

• Steps:
  1. Navigate to Function Group F0 → Select F0.13 (Function Parameter Restore).
  2. Set to 1 (Restore Factory Defaults) → Press the confirmation key (ENT) to save.
• Note: After restoration, key parameters (e.g., motor nameplate data, control mode) must be reconfigured.

3. Password Setup and Access Restrictions

• Setting Password: Input a 4-digit number (range 0~65535) via F7.00 (User Password); non-zero values take effect.
• Removing Password: Set F7.00 to 0 or restore factory defaults.
• Parameter Access Restrictions:
  • A valid password is required to enter editing mode (display “PASS” before input).
  • Some parameters (marked with “-“) are manufacturer-specific and cannot be modified by users.

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II. External Terminal Control and Speed Adjustment Settings

1. External Terminal Forward/Reverse Control

• Terminal Connections:
  • Forward Terminal: X1 (default function code F5.04=1).
  • Reverse Terminal: X2 (default function code F5.05=2).
  • Common Terminal: COM.
• Parameter Settings:
  1. Set F0.01 (Operation Command Channel) to 1 (Terminal Command Channel).
  2. Configure F5.07 (Terminal Control Mode):
     • 0 (Two-Wire Control): X1 for forward, X2 for reverse; both closed stops the drive.
     • 1 (Three-Wire Control): Requires an additional terminal as an enable signal (e.g., configure X3 as “Three-Wire Operation Control”).

2. External Potentiometer Speed Adjustment

• Terminal Connections:
  • Potentiometer Signal Input: VS1 (0~10V) or VS2 (0~10V/4~20mA, selected via jumper).
  • Signal Ground: GND.
• Parameter Settings:
  1. Set F0.03 (Frequency Command Selection) to 2 (Analog VS1) or 3 (Analog VS2).
  2. Calibrate Input Range (Optional): Adjust F5.09~F5.12 (VS1 Upper/Lower Limit Corresponding Values) to ensure 0~10V corresponds to 0%~100% frequency.
  3. For current signals (4~20mA), switch VS2 jumper to current mode (JP2 position).

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III. E-03 Fault Analysis and Solution

1. Fault Definition and Symptoms

• E-03 Fault: Overcurrent during constant-speed operation, triggering protective shutdown. The LED display shows “E-03” and flashes.

2. Possible Causes

• Load Sudden Change: Mechanical jamming, abnormal drive system (e.g., gear damage).
• Power Supply Abnormality: Input voltage fluctuations or instantaneous drops.
• Improper Parameter Configuration: Motor parameters (Group F2) do not match actual values, or carrier frequency (F0.11) is set too high.
• Hardware Issues: Abnormal current detection circuit, aged IGBT module.

3. Solution Steps

• Step 1: Check Load and Mechanical System
  • Disconnect the motor from the load and test under no-load conditions to check if the fault persists.
  • Inspect couplings and bearings for jamming; eliminate mechanical abnormalities.
• Step 2: Optimize Parameter Configuration
  • Adjust F0.11 (Carrier Frequency): Reduce the carrier frequency (e.g., from 8kHz to 4kHz) to reduce switching losses.
  • Calibrate Group F2 (Motor Parameters): Perform motor self-learning (F0.12=1 or 2) to ensure accurate stator resistance and inductance values.
• Step 3: Check Power Supply and Hardware
  • Measure three-phase input voltage to ensure balance deviation <15%.
  • Detect DC bus voltage; if abnormal fluctuations occur, install an input reactor.
  • Troubleshoot current sensor (Hall element) or drive circuit faults; replace modules if necessary.

4. Preventive Measures

• Regularly clean the cooling fan to ensure the inverter module temperature (F7.09) <85°C.
• Enable F8.07 (Automatic Current Limiting Function) and set the current limiting level (F8.07=150%) to suppress sudden overcurrents.

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IV. Conclusion

The AUT-DRIVE DV6000 VFD offers flexible parameter configuration and terminal control functions to meet complex industrial requirements. Operators must strictly follow the manual instructions, perform regular maintenance, and record operational data. For E-03 faults, systematically troubleshoot load, power supply, parameter, and hardware issues, combined with function code adjustments and mechanical maintenance, to ensure stable device operation. Password protection and parameter access restrictions further enhance equipment management security.

I. Product Overview & Core Features

The SJZO Frequency Inverter 200M Series is a high-performance vector control inverter designed for industrial automation, widely applied in motor speed regulation, energy-saving control, and precision drive scenarios. Its core advantages include a wide power range (0.4kW–500kW), high-precision control algorithms, and multifunctional interface design. This guide provides detailed instructions on operating panel functions, parameter setup techniques, external control implementation methods, and common fault troubleshooting.

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II. Operating Panel Functions & Parameter Management

1. Operating Panel Overview

The SJZO 200M Series features an intuitive LCD operating panel supporting the following core functions:

• Start/Stop Control: Directly start or stop the motor via panel buttons.
• Frequency Setting: Adjust output frequency (0–400Hz) via a knob or digital input.
• Parameter Display & Modification: View real-time parameters such as current, voltage, and fault codes.
• Mode Switching: Toggle between local control (panel operation) and remote control (external signals).

2. Password Setup & Removal

（1）Setting a Password

• Access parameter group P7 (Access Control) and locate parameter P7.01 (User Password).
• Enter a 4-digit password (e.g., 1234) and press “Confirm” to save.
• Once enabled, critical parameter modifications require password input.

（2）Removing the Password

• Access P7.01, enter the set password, and change the value to “0000” to remove it.

3. Parameter Access Restrictions

• Hierarchical Access Control:
  • Parameter group P7.02 allows setting different access levels (e.g., Engineer Level, Operator Level) to restrict unauthorized parameter modifications.
  • Example: Setting P7.02 to “1” allows viewing only basic parameters; setting it to “2” grants full parameter modification access.

4. Restoring Factory Default Settings

• Method 1: Panel Operation
  • Press and hold the “Reset” button for 5 seconds until “INI” appears on the screen, then release. Parameters will automatically revert to defaults.
• Method 2: Parameter Setup
  • Access parameter P0.15 (Factory Reset), set it to “1,” and confirm. The inverter will restart with default settings.

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III. External Terminal Forward/Reverse Control & Potentiometer Speed Regulation

1. External Terminal Forward/Reverse Control

（1）Wiring Instructions

• Forward Terminal (e.g., X1): Connect to an external switch signal (normally open contact). Closing the contact starts the motor in the forward direction.
• Reverse Terminal (e.g., X2): Connect to another switch signal. Closing the contact starts the motor in reverse.
• Common Terminal (COM): Provides a reference ground for control signals.

（2）Parameter Setup

• Control Mode Selection:
  • Set P0.01=1 (External Terminal Control Mode).
• Terminal Function Definitions:
  • Set P4.01=1 (X1 as Forward Command), P4.02=2 (X2 as Reverse Command).
• Interlock Protection:
  • Enable P4.10=1 (Forward/Reverse Interlock) to prevent simultaneous activation and short circuits.

2. External Potentiometer Frequency Regulation

（1）Wiring Instructions

• Potentiometer Connection:
  • Connect the potentiometer ends to the inverter’s +10V (power supply) and GND (ground), and the wiper to the analog input terminal AI1 (or AI2).
• Signal Range: 0–10V corresponds to an output frequency range of 0–50Hz (adjustable).

（2）Parameter Setup

• Frequency Source Selection:
  • Set P0.02=2 (Analog Input AI1 as Frequency Setting Source).
• Input Range Calibration:
  • Set P3.01=0 (0–10V input), P3.02=50.00 (corresponding to a maximum frequency of 50Hz).
• Filtering Time:
  • Adjust P3.05=0.1s (to reduce signal jitter interference).

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IV. E.04 Fault Code Analysis & Troubleshooting

1. Fault Definition

E.04 indicates “Output Overcurrent,” meaning the inverter detects motor current exceeding the rated threshold (typically 150%–200%). Common causes include:

• Motor winding short circuits or ground faults.
• Sudden load changes (mechanical jamming, abnormal drive system).
• Excessively short acceleration time (improper P0.07 setting).
• IGBT module damage or drive circuit failure.

2. On-Site Troubleshooting Steps

Step 1: Power-Off Inspection

1. Disconnect power and measure the motor’s three-phase winding resistance to ensure balance (deviation ≤5%) and no grounding (resistance ≥5MΩ).
2. Manually rotate the load to rule out mechanical jamming.

Step 2: Parameter Optimization

1. Extend acceleration time: Adjust P0.07 (Acceleration Time) to 10 seconds or more.
2. Reduce torque compensation: Modify P3.12 (Torque Boost) to 5% or less.

Step 3: Hardware Inspection

1. IGBT Module Testing:
   • Use a multimeter’s diode mode to measure IGBT pins. Normal operation shows forward conduction and reverse cutoff. Replace the module if short-circuited.
2. Current Sensor Check:
   • Compare three-phase output current values. An abnormal phase may indicate a Hall sensor fault.

Step 4: Anti-Interference Measures

1. Separate power and signal lines by ≥20cm.
2. Install ferrite filters at both ends of analog signal lines.

3. Preventive Measures

• Regularly clean cooling air ducts to ensure proper fan operation.
• Avoid frequent starts/stops or overloading.
• Install input reactors (optional) in environments with significant grid voltage fluctuations.

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V. Maintenance & Technical Support

1. Routine Maintenance:
   • Check terminal tightness monthly to prevent poor contact.
   • Clean internal dust and replace aged capacitors quarterly.
2. Professional Support:
   • If the fault persists, contact us or consider equipment recycling services.

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Conclusion

The SJZO Frequency Inverter 200M Series has become a cornerstone device in industrial automation due to its flexible control methods and high reliability. Mastering operating panel functions, external control implementation, and fault troubleshooting techniques can significantly enhance equipment efficiency and lifespan. For E.04 and other common faults, users can resolve issues through systematic troubleshooting. For complex cases, prompt professional support is recommended.

I. Operation Panel Functions and Parameter Management

1. Operation Panel Function Introduction

• Applicable Model: SQ-K01 Operation Panel (Refer to pages 8, 18-23 of the manual)
• Core Functional Modules:
  • Key Functions:
    • Run/Stop: Controls the start/stop of the inverter. Press and hold the “Stop/Reset” key for free stop.
    • Function Key: Toggles between monitoring states and menu levels (Primary Menu → Secondary Menu → Parameter Editing).
    • Save/Confirm Key: Saves parameter modifications and jumps to the next parameter.
    • Shift Key (<<): Switches between monitoring parameters or moves the data editing position.
    • Increment (▲)/Decrement (▼) Keys: Adjusts parameter values or function code numbers.
  • Indicator Lights:
    • FWD/REV: Indicates forward/reverse operation status.
    • H/V/A/r/min: Correspond to display units for frequency, voltage, current, and speed, respectively.
    • Digital Display: 5-digit LED displays parameter values, fault codes, or operational data (e.g., output frequency 50.00Hz).

2. Parameter Initialization

• Steps (Refer to parameter F2.00 on page 29 of the manual):
  1. Enter the primary menu and select -F2- (Auxiliary Settings Group).
  2. Enter the secondary menu and select F2.00 (Parameter Initialization).
  3. Set to 1 to restore factory settings, or 2 to clear fault records.
  4. Press the “Save” key to confirm, and the inverter will restart automatically to take effect.

3. Password Setting and Removal

• Setting Password (Parameter F2.03 on page 29 of the manual):
  1. Enter F2.03 (Parameter Permission Modification Password) and input a value between 0-65535.
  2. After saving, entering this password will be required to modify other parameters.
• Removing Password: Reset F2.03 to 0 to cancel password protection.

4. Parameter Access Restrictions

• Setting Method: Set permissions via F2.01 (Parameter Write Protection) (Refer to page 29 of the manual)
• Permission Options:
  • 0: Allows modification of all parameters (some parameters cannot be modified during operation).
  • 1: Only allows modification of the digital set frequency (F0.02).
  • 2: Prohibits modification of all parameters (only F2.01 and F2.03 can be adjusted).

II. External Terminal Control and Potentiometer Speed Regulation Settings

1. External Terminal Forward/Reverse Control

• Wiring and Parameter Settings (Refer to pages 12-15, 46-48 of the manual):
  • Wiring Terminals:
    • Power Input: L/N (Single-phase 220V) or R/S/T (Three-phase 380V).
    • Control Terminals: X1-X6 are multi-function inputs, COM is the common terminal.
    • Example Wiring: X1 connected to the forward rotation button, X2 connected to the reverse rotation button, both short-circuited with COM to take effect.
  • Parameter Settings:
    1. F0.00: Set to 1 (External Terminal Control Mode).
    2. F4.00-F4.05: Define terminal functions (e.g., X1=5 “Forward Rotation”, X2=6 “Reverse Rotation”).
    3. F4.06: Select control mode (recommended 2 Two-Wire Control Mode 1, FWD/REV independently controlled).

2. External Potentiometer Frequency Speed Regulation

• Wiring and Parameter Settings (Refer to pages 14-15, 36-37, 51 of the manual):
  • Wiring Terminals:
    • Analog Input: AII (0-10V) connected to the middle pin of the potentiometer, COM connected to the negative terminal, 10V terminal connected to the power positive terminal.
    • Jumper Setting: The J1 jumper on the control board needs to be short-circuited to the “V” side (voltage input mode).
  • Parameter Settings:
    1. F0.01: Set to 3 (External Analog Signal AII for Frequency Setting).
    2. F5.00-F5.03: Calibrate the input range (default 0-10V corresponds to 0-100% frequency).
    3. F5.04: Adjust the filtering time (default 0.2 seconds, for anti-interference purposes).

III. Fault Code Analysis and Handling Methods

Common Fault Codes and Solutions (Refer to pages 65-66 of the manual)

Fault Code	Meaning	Solution
E001	Acceleration Overcurrent	Check motor load, extend acceleration time (F0.06).
E004	Acceleration Overvoltage	Increase deceleration time (F0.07), check braking resistor.
E009	Radiator Overheating	Clean the air duct, ensure ambient temperature ≤40℃.
E010	Inverter Overload	Reduce load or increase inverter capacity.
E011	Motor Overload	Adjust F8.01 (Motor Overload Protection Coefficient).
E015	Undervoltage During Operation	Check input power voltage, adjust F8.06 threshold.
E016	EEPROM Read/Write Fault	Restore factory parameters, contact the manufacturer to replace the storage chip.

General Fault Troubleshooting Steps:

1. Power-Off Inspection: Disconnect the power supply for 5 minutes, check for loose or short-circuited wiring.
2. Reset Operation: Press the “Stop/Reset” key to clear the fault and power on again.
3. Parameter Verification: Confirm that key parameters (such as F0.03 maximum frequency, F3 group motor parameters) match the equipment.
4. Contact Support: If the fault persists, record the code and contact the manufacturer (Phone: 17328677949).

IV. Conclusion

The SQ1000 inverter meets complex industrial demands through flexible parameter configuration and diverse control methods. Users must strictly adhere to the safety specifications in the manual (such as grounding and heat dissipation requirements) and perform regular maintenance to extend the equipment’s lifespan. Mastering the operation panel functions, external control settings, and fault handling techniques can significantly improve equipment operational efficiency and stability. It is recommended to keep the manual and refer to it regularly to ensure compliance and safety in operations.

I. Introduction

The Xinshuangyuan AT Series Frequency Inverter is a widely used device in the field of industrial control. Its user manual serves as an essential guide for users to operate and maintain the inverter correctly. This document, based on the contents of the user manual, provides a detailed introduction to the operation panel functions, parameter setting methods, implementation of external control functions, and troubleshooting of fault codes for the AT Series Frequency Inverter, aiming to assist users in better understanding and utilizing the inverter.

II. Introduction to Operation Panel Functions

The operation panel of the Xinshuangyuan AT Series Frequency Inverter is the primary interface for user interaction with the inverter. Through the operation panel, users can perform tasks such as parameter setting, status monitoring, and fault diagnosis. Below is an introduction to the functions of each key on the operation panel:

• Programming Key: Used to select between normal mode and programming mode. This key is effective whether the inverter is running or stopped. To modify parameters, users must press this key to enter programming mode.
• Function/Save Key:
  • Normal Mode: Pressing this key displays various information about the inverter’s status, such as target frequency, output frequency, current, and temperature.
  • Programming Mode: Pressing this key displays parameter contents and, when pressed again, saves any changed parameter values.
• ▲ Key: Increases parameter numbers or values. A short press results in step-by-step changes, while a long press leads to rapid changes.
• ▼ Key: Decreases parameter numbers or values.
• Shift Key: Used for shifting in programming mode and jogging in normal mode.
• Forward/Reverse Key: Toggles between forward and reverse rotation.
• Start Key: Initiates the output of the inverter.
• Stop/Reset Key: Stops operation and resets faults.

III. Parameter Setting and Password Management

1. Parameter Initialization

Although the user manual does not directly mention the steps for parameter initialization, users can achieve it through the following method:

• Enter programming mode and locate the parameter group that needs to be initialized.
• Restore the parameter values to their defaults.
• Save the parameters and exit programming mode.

2. Password Setting

To protect the inverter’s parameters from unauthorized modifications, users can set a password. Below are the relevant parameters for password setting:

• P008: Hidden password, with a range of 0-65535 and a default value of 00000 (no password). Users can set a password as needed.
• P009: Password input. When the value of P009 equals the hidden value of P008, P008 and other parameter values can be changed. After a power-off restart, P009 will be cleared, and the password must be re-entered to modify parameters.

3. Parameter Access Restrictions

Some parameters of the Xinshuangyuan AT Series Frequency Inverter are only applicable to certain models. For example, gray parameters are exclusive to advanced models with PID/485 functions and are invalid for standard models. Additionally, specific parameters are exclusive to the AT2 model (such as P97, P98) and time counter models (such as *93, *94). Users should pay attention to the applicable range of parameters when setting them.

IV. Implementation of External Control Functions

1. External Terminal Forward/Reverse Control

The Xinshuangyuan AT Series Frequency Inverter supports external terminal forward/reverse control. Below is the wiring method for the AT3 model:

• X4 Input Port 4: Line-controlled forward rotation. Short-circuiting X4 with COM activates the input signal.
• X5 Input Port 5: Line-controlled reverse rotation. Short-circuiting X5 with COM activates the input signal.

For AT1, AT4, and AT2 models, although the user manual does not directly mention the specific terminals for external terminal forward/reverse control, users can achieve forward/reverse control through multifunction input settings.

2. External Potentiometer Frequency Regulation

The Xinshuangyuan AT Series Frequency Inverter supports external potentiometer frequency regulation. Below are the wiring and parameter setting methods:

• Wiring: Users can achieve external potentiometer frequency regulation through external analog voltage input (VI1, 0-5V/10V) or external current signal input (CI, 4-20mA). Refer to the wiring diagram in the user manual for specific wiring methods.
• Parameter Settings:
  • P010: Source of operating frequency. Select external analog signal (2) or CI (3) as the frequency source.
  • Other relevant parameters (such as P000-P007) may need to be adjusted to match the input range of the external potentiometer.

V. Fault Codes and Troubleshooting Methods

The Xinshuangyuan AT Series Frequency Inverter provides detailed fault codes and troubleshooting methods. Below are some common fault codes and their corresponding troubleshooting methods:

• Err 1: Overcurrent/Output Short Circuit
  • Troubleshooting Method: Check the output circuit and motor for short circuits, and eliminate any short-circuit faults.
• Err 2: Undervoltage Protection
  • Troubleshooting Method: Check if the input power supply voltage is normal and eliminate any issues with low power supply voltage.
• Err 3: Overvoltage Protection
  • Troubleshooting Method: Check if the input power supply voltage is too high or if there is a fault in the inverter’s internal voltage detection circuit.
• Err 4: Drive Circuit Fault
  • Troubleshooting Method: Contact professional maintenance personnel to inspect and repair the drive circuit.
• Err 5: Start Input During Power-On
  • Troubleshooting Method: Check if there is an accidental start signal input during power-on and eliminate any misoperations or circuit faults.
• Err 6: Overcurrent Protection
  • Troubleshooting Method: Check if the motor and load are overloaded or if there is a fault in the inverter’s internal current detection circuit.
• Err 7: Timeout
  • Troubleshooting Method: Check the inverter’s runtime settings or related timer settings and eliminate any timeout faults.
• Err 8: Radiator Overheating
  • Troubleshooting Method: Check if the radiator is blocked, if the ambient temperature is too high, or if there is a fault in the inverter’s internal temperature detection circuit.
• Err 9: External Fault
  • Troubleshooting Method: Check the external control signal lines and equipment and eliminate any external faults.

VI. Conclusion

The user manual for the Xinshuangyuan AT Series Frequency Inverter is an essential guide for users to operate and maintain the inverter correctly. This document, based on the contents of the user manual, provides a detailed introduction to the operation panel functions, parameter setting methods, implementation of external control functions, and troubleshooting of fault codes. It is hoped that this document can assist users in better understanding and utilizing the Xinshuangyuan AT Series Frequency Inverter, thereby improving the operational efficiency and reliability of the equipment. In practical applications, users should refer to the user manual for operation and maintenance according to their specific needs and equipment models.