Inovance CP700 Series Air Compressor All-in-One Drive User Guide: Operation Panel, Multi-Unit Coordination and Fault Troubleshooting

The Inovance CP700 series is an integrated air compressor drive system that combines the variable frequency drive, compressor controller, and auxiliary power circuits into a single wall-mountable enclosure. Designed for the 5.5 kW to 200 kW power range, the CP700 eliminates the need for separate drive cabinets, external contactors, and standalone control panels, significantly reducing installation complexity and footprint in compressor rooms. The all-in-one architecture integrates a 220V AC auxiliary power output, a 24V DC sensor power supply, a bypass (power-frequency) contactor, and PT100/PTC motor temperature detection circuits directly within the drive enclosure.

All-in-One Architecture

Integrated Components

The CP700 enclosure houses the following integrated subsystems that would traditionally require separate components:

• Main variable frequency drive: Drives the compressor motor with sensorless vector control, supporting both asynchronous and permanent magnet synchronous motors
• Variable frequency fan output: A secondary inverter output (U2/V2/W2 or U3/V3/W3 depending on model) drives the cooling fan motor at variable speed based on temperature demand, eliminating the need for a separate fan drive
• Power-frequency fan output: Models without variable frequency fan capability provide direct 50/60 Hz power output to the cooling fan through an internal contactor
• 220V AC auxiliary power output: Internal 220V AC power supply (50VA capacity) for driving the solenoid valve that controls the compressor inlet valve
• 24V DC sensor power supply: Powers external pressure sensors, temperature sensors, and control devices without requiring an external power supply
• PT100 and PTC detection circuits: Dedicated temperature sensor inputs for monitoring compressor head oil temperature and motor winding temperature
• Bypass contactor: Internal power-frequency bypass contactor enables direct-on-line starting for backup operation if the drive requires service

Model Numbering System

The CP700 model number follows the format CP700-4T22-H, where:

• CP700: Product series identifier (air compressor all-in-one drive)
• 4T: Voltage class (4T = three-phase 380-440V AC; 2T = three-phase 200-240V AC)
• 22: Adapted motor power in kW (22 = 22 kW)
• H: Mounting method (H = wall-mounted)

Technical Specifications

The CP700 main drive supports output frequencies up to 500 Hz with a carrier frequency adjustable from 2 kHz to 12 kHz. The carrier frequency automatically derates based on heatsink temperature to prevent overheating in high ambient conditions. The drive delivers speed control accuracy of plus or minus 0.1% in sensorless vector control mode, with a speed regulation ratio of 1:50.

The fan drive output provides variable frequency control for cooling fans on models from 18.5 kW and above. Smaller models (5.5-15 kW at 380V) use power-frequency fan output only, as the fan power demand is low enough that variable speed control provides minimal energy benefit.

Power Range and Configurations

The CP700 is available in both three-phase 200-240V and three-phase 380-440V versions. Representative model specifications at 380V include:

Model	Motor Power (kW)	Input Current (A)	Output Current (A)	Variable Fan Power (kW)	Power-Frequency Fan Power (kW)
CP700-4T5.5-H	5.5	15.9	13	–	0.4
CP700-4T22-H	22	57.5	45.0	0.75	0.75
CP700-4T55-H	55	112.0	105.0	2.2	0.75
CP700-4T90-H	90	186.0	170.0	2.2	0.75
CP700-4T132-H	132	257	250	3.0	–
CP700-4T200-H	200	384	355	5.5	–

Operation Panel and Indicators

LED Indicator Panel

The CP700 front panel includes LED indicators that provide immediate visual status feedback:

• Power LED: Illuminated when the drive is powered, indicating the main power supply is connected and the internal control circuit is active
• Run LED: Illuminated when the compressor is running, indicating the drive is actively outputting voltage to the motor
• Fault LED: Illuminated when a fault condition is active, indicating that the drive has tripped and requires attention

SOP-20-CP Operation Keyboard

The CP700 uses the SOP-20-CP operation keyboard for parameter configuration and monitoring. This keyboard provides a digital display showing operating frequency, motor current, DC bus voltage, motor speed, pressure readings, and temperature values. The keyboard connects to the drive through a dedicated RJ45 interface and can be panel-mounted or used as a handheld device during commissioning.

HMI Interface

For complete compressor system control, the CP700 is designed to work with an external HMI (Human Machine Interface) panel such as the IT5070T. The HMI provides a graphical interface displaying real-time compressor data including pressure, temperature, motor current, frequency, and power consumption. The HMI also provides access to configuration pages for operating parameters, maintenance settings, and protection thresholds.

The HMI main interface includes the following navigation structure:

• Monitoring page: Real-time display of supply pressure (MPa), temperature (degrees C), motor frequency (Hz), motor current (A), and power (kW)
• Alarm page: Active and historical fault records
• Operating parameters: Pressure, frequency, sleep, stop, and temperature parameter groups
• Maintenance parameters: Service intervals for air filter, oil separator, lubricant, oil filter, and motor grease
• Protection parameters: Exhaust warning temperature, exhaust shutdown temperature, supply pressure upper limit, supply shutdown pressure
• Drive parameters: Main drive and fan drive motor nameplate data, acceleration/deceleration times, and maximum frequency settings

Multi-Compressor Coordination

Pressure Control Architecture

The CP700 implements a comprehensive pressure control architecture that manages compressor operation based on actual system demand. The control logic uses a built-in PID controller that compares the measured supply pressure (from a 4-20mA pressure sensor) against the target pressure setpoint. The PID output adjusts the compressor motor speed to maintain the target pressure within a tight tolerance band.

Key pressure control parameters include:

• Supply pressure setpoint: The target system pressure that the compressor maintains
• Unload pressure: When system pressure exceeds this threshold, the compressor enters unload mode (motor runs at minimum speed with inlet valve closed)
• Sleep wake pressure: When system pressure drops below this threshold during unload mode, the compressor resumes loaded operation
• Supply pressure upper limit: Triggers a warning when exceeded
• Supply shutdown pressure: Triggers a protective shutdown when exceeded
• Pressure Kp and Ti: PID proportional gain and integral time for pressure loop tuning

Sleep and Wake Function

To minimize energy consumption during periods of low air demand, the CP700 implements a sleep/wake function. When the compressor operates at minimum frequency for a sustained period and system pressure remains above the sleep wake threshold, the drive stops the compressor motor entirely. When system pressure drops below the wake pressure, the drive automatically restarts the compressor and resumes pressure regulation.

Key sleep parameters include:

• Sleep wake pressure: The pressure threshold below which the compressor restarts
• Sleep determination time: The duration the compressor must operate at minimum frequency before entering sleep mode
• Stop preparation time: The delay between the stop command and actual motor stop, allowing the inlet valve to close
• Minimum stop time: The minimum off-period between consecutive starts to prevent rapid cycling

Pre-Run Frequency and Time

Before reaching the target pressure, the compressor runs at a pre-run frequency for a configurable pre-run time. This allows the compressor to build initial pressure and oil circulation before transitioning to PID-controlled operation. The pre-run frequency should be set high enough to ensure adequate lubrication but not so high as to cause pressure overshoot.

Temperature Control Integration

The CP700 integrates temperature control for the compressor cooling system. The fan drive speed is automatically regulated based on the measured compressor head temperature:

• Variable constant temperature: Below this temperature, the fan operates at minimum frequency or stops
• Power-frequency fan start temperature: For models with power-frequency fans, the fan starts when this temperature is exceeded
• Fan stop temperature: The fan stops when temperature drops below this threshold
• Temperature Kp and Ti: PID parameters for the temperature control loop
• Exhaust warning temperature: Triggers a warning when exceeded
• Exhaust shutdown temperature: Triggers a protective shutdown to prevent compressor damage from overheating

Parameter Groups

The CP700 parameter system is organized into the following functional groups:

• F0 group: Basic drive configuration (control mode, command source, frequency source)
• F1 group: Motor parameters (rated power, voltage, current, frequency, speed)
• F2 group: Vector control parameters (speed loop PI gains)
• F4 group: Digital input terminal functions
• F7 group: Operating status and monitoring parameters
• F8 group: Protection function parameters
• F9 group: Application function parameters including output loss detection (F9-64, F9-65)
• FA group: PID control parameters including feedback loss detection (FA-26, FA-27)
• A0, A5, A8, A9 groups: Compressor-specific application parameters
• B0, B1, B3 groups: Basic drive configuration and terminal assignments
• U0, U2 groups: User-defined parameter groups

A8 Group: Compressor Application Parameters

The A8 group contains parameters specific to the CP700’s compressor control application. These parameters define the compressor operating logic, including the relationship between pressure, temperature, and motor speed. The A8 group includes detailed configuration for the multi-step pressure control, unload sequence, and coordination between the main drive and fan drive.

Safety and Protection Functions

The CP700 provides comprehensive protection functions designed specifically for air compressor applications:

• Output loss detection (E30.00): Triggers when the motor running current falls below parameter F9-64 for a sustained period, indicating that the compressor coupling has failed or the motor is unloaded due to mechanical disconnection
• PID feedback loss (E31.00): Triggers when the PID feedback signal drops below FA-26 for a duration exceeding FA-27, indicating a pressure sensor failure or signal cable break
• Cumulative run time fault (E26.00): Triggers when total operating hours exceed the maintenance threshold, reminding operators to perform scheduled maintenance. The threshold is calculated as F8-75 + F8-17 multiplied by 3600 seconds
• Cumulative power-on time fault (E29.00): Similar to E26.00 but based on total power-on time rather than running time
• STO (Safe Torque Off) card option: The CP700 supports an optional STO card (model MCTC-JCB-A2-STO, part number 98020487) for applications requiring functional safety compliance. Note that the standard CP700 does not include STO functionality; only the non-standard CP500 variant supports STO natively.

Motor Protection

The CP700 includes specialized motor protection features:

• Demagnetization protection (E34.00): For permanent magnet motors, monitors the back-EMF value and compares it against the parameter F1-19 setting. If the deviation exceeds B0-27 multiplied by B0-24 for more than 30 seconds, the drive trips to protect the motor from irreversible demagnetization
• Oscillation anomaly (E35.00): Detects excessive output current harmonics above threshold B0-26 for a duration exceeding B0-25, indicating possible motor demagnetization or control instability
• Capacitor value warning (E32.00): Monitors DC bus capacitor health by measuring capacitance value degradation, providing early warning of capacitor aging before failure

Installation and Wiring

Mounting

The CP700 is designed for wall-mounted installation using the integrated mounting brackets. The enclosure includes a cable management bracket (part 11 in the component diagram) for organizing input and output power cables. Adequate clearance must be maintained around the enclosure for cooling airflow, with minimum clearances specified in the installation chapter.

Main Power Terminal Layout

The main power terminals are arranged for convenient wiring:

• Input terminals (R, S, T): Three-phase AC power input
• Main motor output (U1, V1, W1): Variable frequency output to compressor motor
• Variable fan output (U2, V2, W2 or U3, V3, W3): Variable frequency output to cooling fan motor
• Power-frequency fan output: Direct AC output to cooling fan motor
• DC bus measurement terminals: Accessible after removing the front cover, used for testing DC bus voltage and IGBT rectifier bridge integrity
• Ground terminals (PE): Multiple grounding points for input, main motor output, and fan output circuits

Control Terminal Wiring

Control terminals provide connections for:

• Pressure sensor input (4-20mA, 12-bit resolution, 0.5% accuracy)
• Temperature sensor input (PT100, 12-bit resolution, -25 to +220 degrees C range, plus or minus 3 degrees C accuracy)
• Digital inputs (DI terminals for emergency stop, PTC motor temperature protection, and external control signals)
• Relay outputs (T1A/T1C for solenoid valve control with internal 220V AC supply; T2A/T2C for general alarm output)
• 24V DC sensor power output
• RS485 communication (RJ45 connector or DB9 connector depending on model)

Recommended Cable Selection

The CP700 manual provides detailed cable selection tables for both IEC and UL standards. For 380V models, main power cable cross-sections range from 4 mm squared for the 11 kW model to 2×300 kcmil for the 200 kW model. Fan output cables are typically 0.75 mm squared or 14 AWG. Terminal torque specifications range from 2.5 Nm for small models to 70 Nm for the largest models, with specific torque values provided for each terminal point.

Fault Troubleshooting

The CP700 provides an extensive fault code system organized into E-group codes with detailed cause analysis and corrective actions:

Fault Code	Fault Name	Mechanism	Corrective Action
E22.00	Stator resistance identification warning	Identified stator resistance outside normal range	Check F1-00 through F1-05 parameters; verify motor rated voltage (F1-02) and rated current (F1-03) match nameplate
E22.01	Rotor resistance identification warning	Identified rotor resistance outside normal range	Verify motor parameters; confirm motor was stationary during identification
E22.02	No-load current and mutual inductance warning	Identified values outside normal range; drive substitutes calculated values	Verify motor parameters; ensure motor is unloaded during identification
E22.03	Back-EMF identification warning	Identified back-EMF outside normal range (synchronous motors)	Verify rated voltage F1-02; ensure motor is unloaded during identification
E22.04	Inertia identification warning	Identified inertia outside normal range	Verify rated current F1-03 matches motor nameplate
E23.00	Output ground short circuit overcurrent	Current between output phase and ground exceeds threshold	Check all connection points; test ground impedance with megohmmeter; replace cable or motor if necessary. Do not run motor until fault cause is resolved.
E24.00	Output phase-to-phase short circuit	Current between output phases exceeds threshold during detection	Use multimeter to check for short circuits between U, V, W phases at motor terminals
E25.00	Rectifier fault	Front-end rectifier reports fault or warning	Check for rectifier faults such as input phase loss or overtemperature; verify rectifier terminal configuration for feedback signals
E26.00	Cumulative run time reached	Total run time exceeds F8-75 + F8-17 x 3600 seconds	Use parameter initialization function to clear maintenance record after performing scheduled service
E27.00/E28.00	User-defined fault 1/2	DI or virtual IO function 44/45 signal active	Check F4/A1 terminal configuration; reset and run after resolving external fault condition
E29.00	Cumulative power-on time reached	Total power-on time exceeds F8-74 + F8-16 x 3600 seconds	Clear maintenance record using parameter initialization
E30.00	Output loss	Motor running current below F9-64 for sustained period	Verify load is connected; confirm F9-64 and F9-65 settings match actual operating conditions
E31.00	PID feedback loss	PID feedback below FA-26 for duration exceeding FA-27	Check pressure sensor signal; verify FA-26 threshold is appropriate for the application
E32.00	Capacitor value warning	DC bus capacitance below standard value	Hardware fault requiring internal inspection; contact technical support
E34.00	Demagnetization protection	Back-EMF deviation from F1-19 exceeds B0-27 x B0-24 for 30 seconds	Disconnect motor shaft; use oscilloscope to measure back-EMF; replace motor if demagnetized
E35.00	Oscillation anomaly	Output current harmonics exceed B0-26 for duration exceeding B0-25	Reduce F2-00 through F2-04 speed loop parameters; contact technical support
E36.00-E38.00	Fan 1/2/3 fault	Associated fan drive reports fault	Check corresponding fan drive fault code and analyze accordingly

Maintenance and Service

Daily Maintenance

• Check for abnormal noise, vibration, or odor from the drive and compressor
• Verify LED indicators show normal status (power on, run when operating, fault off)
• Monitor HMI display for pressure, temperature, and current readings within normal ranges

Periodic Inspection

• Clean heatsink fins quarterly (monthly in dusty environments)
• Verify cooling fan operation and replace if bearing noise is detected
• Check terminal screw tightness annually
• Inspect capacitor condition annually for bulging or leakage
• Record cumulative run hours and schedule preventive maintenance before threshold faults trigger

Wear Part Replacement

The CP700 manual provides specific guidance for replacing wear parts:

• Cooling fans: Replace when bearing noise becomes audible or when fan speed monitoring indicates degradation. The number and location of fans vary by model; the manual specifies fan quantities and replacement procedures for each power rating.
• Electrolytic capacitors: Monitor via E32.00 capacitor value warning. Proactive replacement is recommended after the rated service life (typically 60,000-80,000 hours depending on operating temperature and carrier frequency settings).

The CP700 series demonstrates Inovance’s commitment to application-specific integration, where the unique requirements of air compressor systems are incorporated directly into the drive design. The all-in-one architecture reduces total system cost, simplifies installation, and improves reliability by eliminating inter-component wiring and reducing the number of separate enclosures in the compressor room.