Inovance CP600 Series Air Compressor Integrated Drive User Guide: Operation Panel, Terminal Control and Fault Troubleshooting

The Inovance CP600 series is an integrated air compressor drive designed for the 7.5 kW to 55 kW power range, combining the variable frequency drive and compressor control logic into a single enclosure with both floor-standing (cabinet) and wall-mounted form factors. The CP600 differentiates itself from the CP700 by offering a dual-output architecture that independently drives both the compressor main motor and the cooling fan motor from a single integrated unit, while targeting a more compact power range and providing flexible installation options for different compressor room layouts.

Integrated Drive Architecture

Dual-Output Design

The defining architectural feature of the CP600 is its dual-output design. The main power circuit provides two independent three-phase AC outputs from a single enclosure:

• Host motor output (U1, V1, W1): Drives the compressor main motor using sensorless vector control. This output handles the primary air compression workload and operates at variable frequency based on system pressure demand.
• Fan motor output (U2, V2, W2): Drives the cooling fan motor. On models from 7.5 kW to 15 kW, this output provides power-frequency (50/60 Hz) operation for standard cooling fans. On models from 18.5 kW to 55 kW, the fan output is variable frequency, allowing the cooling fan speed to be regulated based on compressor head temperature.

This dual-output architecture eliminates the need for a separate fan drive or fan contactor, reducing external component count and wiring complexity. Both outputs share a common DC bus internally, allowing the system to benefit from regenerative energy recovery when the compressor decelerates.

Internal DC Reactor

The CP600 incorporates an internal DC reactor that improves input power factor and suppresses harmonic distortion on the supply side. This integrated component eliminates the need for an external input reactor in most installations, reducing cost and installation space. The DC reactor also improves the drive’s thermal stability by reducing ripple current in the DC bus capacitors.

Integrated Power Outputs

Beyond the motor drive outputs, the CP600 integrates several auxiliary power circuits:

• 220V AC output: Internal 220V AC power supply (50VA capacity) for driving the compressor solenoid valve that controls the inlet valve. This output is available on the T1A-T1C relay terminals.
• 24V DC output: Provides power for external pressure sensors, temperature sensors, and control devices. On 7.5-15 kW models, the 24V output shares a common ground with the digital input common. On 18.5-55 kW models, the 24V output has an isolated ground (COM1) with a maximum output capacity of 0.6A.
• PT100 temperature detection: Dedicated PT100 temperature sensor input for monitoring compressor head oil temperature, supporting a measurement range of -25 to +220 degrees C with plus or minus 3 degrees C accuracy.
• PTC motor protection: Digital input DI4 (on 7.5-15 kW models) or DI6 (on 18.5-55 kW models) supports PTC thermistor input for direct motor winding temperature protection, compatible with standard PTC sensor wiring.

Model Range and Form Factors

The CP600 is available in two physical configurations:

• Wall-mounted (H suffix): Compact enclosure for wall installation, available across the full power range from 7.5 kW to 55 kW. The 7.5-15 kW models are available exclusively in wall-mounted form.
• Floor-standing (V suffix): Cabinet-style enclosure for floor installation, available from 18.5 kW to 55 kW. This format provides larger internal space for cable routing and is preferred for installations where wall mounting is not practical.

Representative model specifications at 380-440V include:

Model	Power (kW)	Input Current (A)	Output Current (A)	Fan Power (kW)	Fan Current (A)	Weight (kg, cabinet)
CP600-4T7.5G	7.5	20.5	17	–	–	6 (wall-mount)
CP600-4T15G	15	35	32	–	–	10 (wall-mount)
CP600-4T22G	22	59	45	0.75	2.1	20
CP600-4T37G	37	69	75	1.5	3.8	30
CP600-4T55G	55	106	112	2.2	5.1	50

Models from 7.5 kW to 15 kW use small-power industrial-frequency fans that do not require variable speed control. The fan power corresponding relationship shows that 18.5-22 kW models use 0.75 kW fans, 30-37 kW models use 1.5 kW fans, and 45-55 kW models use 2.2 kW fans.

Technical Specifications

The CP600 main drive supports output frequencies up to 800 Hz (7.5-15 kW models) or 500 Hz (18.5-55 kW models), with a carrier frequency adjustable from 2 kHz to 12 kHz. The carrier frequency automatically adjusts based on heatsink temperature to prevent thermal overload. The drive achieves speed control accuracy of plus or minus 0.1% in sensorless vector control mode, with a speed regulation ratio of 1:50 and torque response under 15 ms.

The overload capacity follows the G-type machine specification: 115% for 1 hour, 150% for 1 minute, and 178% for 2 seconds. This overload profile is designed to handle the high starting torque requirements of compressor motors and the intermittent surge loads encountered during pressure vessel filling.

Operation Panel and Display

LED Indicator Lights

The CP600 front panel features three LED indicator lights that provide immediate visual status feedback without requiring connection to an HMI:

• Power indicator (green): Off = no power supply; On = power supply connected
• Run indicator (green): Off = compressor stopped; On = compressor running
• Fault indicator (red): Off = normal operating condition; On = fault condition active

These indicators are visible from a distance, allowing compressor room personnel to quickly assess system status during routine walk-through inspections.

HMI Display Interface

For detailed monitoring and parameter configuration, the CP600 connects to an external HMI panel (model IT5070T) through the RJ45 or DB9 communication port. The HMI provides a graphical interface with the following page structure:

Monitoring Page (Main Display):

The main monitoring page displays real-time operating data including supply pressure (MPa), temperature (degrees C), motor frequency (Hz), motor current (A), and power consumption (kW). The page also includes Start and Stop buttons for compressor operation.

Operating Parameters Page:

This page contains five parameter groups:

• Pressure parameters: Supply pressure setpoint, pressure Kp (proportional gain), pressure Ti (integral time)
• Frequency parameters: Host upper frequency limit, host lower frequency limit, pre-run frequency, pre-run time, fan upper frequency limit, fan lower frequency limit
• Sleep parameters: Sleep wake pressure, sleep determination time
• Stop parameters: Stop preparation time, minimum stop time
• Temperature parameters: Variable constant temperature, power-frequency fan start temperature, fan stop temperature, temperature Kp, temperature Ti

Maintenance Parameters Page:

Configurable maintenance intervals for:

• Air filter service cycle (hours)
• Oil separator service cycle (hours)
• Lubricant oil service cycle (hours)
• Oil filter service cycle (hours)
• Motor grease service cycle (hours)

Protection Parameters Page:

• Exhaust warning temperature (degrees C)
• Exhaust shutdown temperature (degrees C)
• Supply pressure upper limit (MPa)
• Supply shutdown pressure (MPa)

Drive Parameters Page:

Separate parameter sections for host drive and fan drive, each including:

• Acceleration time (s)
• Deceleration time (s)
• Maximum frequency (Hz)
• Motor back-EMF coefficient
• Motor rated power (kW)
• Motor rated voltage (V)
• Motor rated frequency (Hz)
• Motor rated current (A)
• Motor rated speed (rpm)

The drive parameters page also provides host jog and fan jog buttons for verifying motor rotation direction during commissioning.

Terminal Wiring and Control

Main Power Terminals

The CP600 main power circuit uses a bottom-entry, bottom-exit cable routing scheme. The terminal layout differs between power ranges:

7.5-15 kW models: The main power terminals include R, S, T (three-phase AC input), U1, V1, W1 (host motor output), and U2, V2, W2 (fan motor output, using screw terminals). A PE grounding terminal is provided for each circuit.

18.5-55 kW models: The terminal layout includes R, S, T (input), U1, V1, W1 (host motor output), and U2, V2, W2 (fan motor output, using pluggable terminals for convenient maintenance). Separate grounding terminals are provided for input, host output, and fan output circuits.

Control Terminal Configuration (7.5-15 kW Models)

The compact control terminal block on 7.5-15 kW models provides:

Terminal	Function	Specification
T1A, T1C	Relay output 1 (default: solenoid valve)	Internal 220V AC supply, 50VA capacity; normally open, max 0.2A at 250V AC
T2A, T2C	Relay output 2	Normally open, max 0.2A at 250V AC
P+, P-	Pressure sensor input	4-20mA input, 12-bit resolution, 0.5% accuracy
PT+, PT-	Temperature sensor input	PT100, -25 to +220 degrees C, plus or minus 3 degrees C accuracy
DI1-DI4	Digital inputs	Isolated NPN input, frequency below 100 Hz; DI4 supports PTC input
COM	Digital input common	Internally connected to GND
24V	24V DC power output	For powering external sensors and controls
RJ45	RS485 communication	Half-duplex, baud rate below 230 kbps; connects to HMI iPanel

Control Terminal Configuration (18.5-55 kW Models)

The expanded control terminal block on 18.5-55 kW models adds additional channels and isolation:

Terminal	Function	Specification
T1A, T1C	Relay output 1 (solenoid valve)	Internal 220V AC, 50VA; T1A-T1C and T2A-T2C share the 220V supply capacity
T2A, T2C	Relay output 2	Normally open, 0.2A at 250V AC (when T1 inactive)
P1+/P1-, P2+/P2-	Dual pressure sensor inputs	Two independent 4-20mA channels
PT1+/PT1-, PT2+/PT2-	Dual temperature sensor inputs	Two independent PT100 channels
DI1-DI6	Six digital inputs	Isolated NPN input; DI5 and DI6 support PTC temperature protection
24V, COM1	Isolated 24V DC output	Output capacity 0.6A, isolated from DI common
485+, 485-, GND	RS485 communication (terminal block)	Same channel as DB9 pin 1, 2, 5
DB9	Dual RS485 communication	Pin 1/2/5 = channel 1; Pin 5/6/9 = channel 2 (for multi-unit coordination)

Recommended Wiring Connections

The standard CP600 wiring configuration includes:

• DI1: Emergency stop button (normally closed contact)
• DI4 or DI6: PTC motor temperature protection input
• T1A-T1C: Solenoid valve (inlet valve control) using internal 220V AC supply
• P+/P-: Pressure sensor (24V powered, 4-20mA output)
• PT+/PT-: PT100 temperature sensor for compressor head oil temperature
• RJ45 or DB9: HMI panel connection for monitoring and configuration

Power Cable Selection

The CP600 manual provides detailed cable selection tables specifying conductor cross-sections and terminal torque values for each model:

Model	Input/Host Output Cable (mm squared)	Fan Output Cable (mm squared)	Input/Host Torque (Nm)	Ground Torque (Nm)
CP600-4T7.5G	4	0.75	2.5	2.5
CP600-4T15G	6	0.75	2.5	2.5
CP600-4T22G	16	0.75	4.0	2.5
CP600-4T37G	25	0.75	4.0	2.5
CP600-4T55G	35	0.75	10.5	10.5

Parameter Settings for Compressor Applications

Built-in Compressor Control Logic

The CP600 incorporates a complete air compressor control logic that manages the following operational states without requiring an external PLC:

• Constant pressure control: PID-regulated motor speed maintains target supply pressure
• Unload pressure management: Opens inlet valve and reduces to minimum speed when pressure exceeds unload threshold
• Sleep and wake control: Stops motor entirely during sustained low-demand periods; restarts when pressure drops below wake threshold
• Stop preparation and locking: Sequences the inlet valve closure and motor deceleration to prevent pressure surges during stopping
• Constant temperature control: Regulates fan speed based on compressor head temperature to maintain optimal operating temperature
• Solenoid valve control: Activates the inlet valve solenoid through the T1A-T1C relay output at the appropriate point in the start/stop sequence

Pressure and Temperature PID Control

The CP600 provides separate PID controllers for pressure and temperature regulation. The pressure PID uses the 4-20mA pressure sensor signal as feedback and adjusts the compressor motor frequency to maintain the target supply pressure. The temperature PID uses the PT100 sensor signal and adjusts the cooling fan frequency to maintain the target compressor head temperature.

PID tuning parameters (Kp and Ti) are accessible through the HMI operating parameters page. For pressure control, start with the factory default Kp and Ti values and adjust based on system response. If pressure overshoot occurs, reduce Kp or increase Ti. If pressure recovery is too slow after demand changes, increase Kp or decrease Ti.

Acceleration and Deceleration

The CP600 supports three acceleration/deceleration curve modes:

• Linear curve: Constant rate of frequency change throughout the ramp; suitable for most compressor applications
• S-curve mode 1: Smoothed start and end of ramp with linear middle section; reduces mechanical stress during transition between stop and run states
• S-curve mode 2: More aggressive S-curve profile for applications requiring very smooth transitions

Acceleration and deceleration times should be set long enough to prevent overcurrent (during acceleration) and overvoltage (during deceleration) faults, but short enough to provide responsive pressure regulation. Typical values for compressor applications range from 5 to 20 seconds depending on motor size and system inertia.

Communication Options

The CP600 supports RS485 communication as standard, accessible through both the RJ45 connector (for HMI connection) and the DB9 connector (for PLC or IoT integration). On 18.5-55 kW models, the DB9 connector provides two independent RS485 channels, allowing simultaneous connection to an HMI and a remote monitoring system.

The DB9 pin assignments are:

• Channel 1: Pin 1 = 485+, Pin 2 = 485-, Pin 5 = GND
• Channel 2: Pin 5 = GND, Pin 6 = 485-, Pin 9 = 485+

The RS485 interface supports half-duplex communication at baud rates up to 230 kbps, enabling integration with building management systems, IoT gateways (such as IOT-WL210D), and multi-unit coordination controllers (H2U) for applications requiring multiple compressors to operate in coordinated master-slave configurations.

Commissioning and Debugging

Commissioning Flow

The CP600 commissioning process follows a structured sequence:

1. Power on: Verify correct three-phase input voltage and confirm the power LED illuminates
2. Set basic parameters: Through the HMI, enter motor nameplate data (rated power, voltage, current, frequency, speed) for both the host motor and fan motor
3. Jog test: Use the host jog and fan jog buttons on the drive parameters page to verify motor rotation direction. If direction is incorrect, swap two motor output phases.
4. Set operating parameters: Configure pressure setpoint, frequency limits, pre-run frequency and time, sleep parameters, and temperature thresholds through the HMI
5. Trial run: Start the compressor and monitor current, voltage, pressure, and temperature during the initial operating cycle
6. Verify protection settings: Confirm that exhaust warning temperature, exhaust shutdown temperature, supply pressure upper limit, and supply shutdown pressure are correctly set for the specific compressor model
7. Stop and finalize: After confirming normal operation, stop the compressor and verify that the stop sequence (inlet valve closure, deceleration, stop) completes without faults

System Debugging Case

Upon power-up, the HMI automatically displays the monitoring page with an initial self-check message. After the self-check completes, the operator navigates to the operating parameters, maintenance parameters, and protection parameters pages in sequence to configure the compressor-specific settings. The drive parameters page is then accessed to enter motor data and perform the jog test.

After confirming motor direction, the operator returns to the monitoring page and presses the Start button. The system executes the start sequence: solenoid valve opens, motor accelerates to pre-run frequency, pre-run timer elapses, motor transitions to PID-controlled operation. The operator verifies that pressure builds normally, temperature remains within limits, and current readings are proportional to load. If any parameter is abnormal, the operator stops the compressor, adjusts the relevant parameter, and repeats the trial run.

Protection Functions and Fault Troubleshooting

Comprehensive Protection Suite

The CP600 implements a full complement of drive and compressor protection functions:

• Power-on ground short circuit detection
• Motor overheat protection (via PTC input on DI4/DI6)
• Drive overcurrent protection
• Drive overload protection (115% for 1 hour, 150% for 1 minute, 178% for 2 seconds)
• Motor overload protection (configurable through motor protection parameters)
• Drive overvoltage and undervoltage protection
• Drive overheat protection (heatsink temperature monitoring)
• Output phase loss detection
• Input phase loss detection
• Communication fault detection
• Current detection fault monitoring
• Motor auto-tuning fault detection
• EEPROM read/write fault detection
• Buffer resistor fault detection

Grid System Requirements

The CP600 is designed for use in grounded-neutral (TN and TT) power systems. For IT (ungrounded) systems, the varistor group jumper screw (marked as screw 1 on the EMC/varistor selection terminal) must be removed. Failure to remove this jumper in IT systems can cause excessive leakage current through the varistor group, potentially damaging the drive or triggering nuisance ground fault trips.

Installation Environment Requirements

• Location: Indoor, protected from direct sunlight, free from dust, corrosive gases, flammable gases, oil mist, water vapor, dripping water, or salt
• Altitude: Below 2000 m (derate output current above 1000 m)
• Ambient temperature: -10 to +40 degrees C (derate above 40 degrees C)
• Humidity: Below 95% RH, non-condensing
• Vibration: Below 5.9 m/s squared (0.6g)
• Storage temperature: -20 to +60 degrees C

Installation Space Requirements

Adequate clearance must be maintained around the CP600 for cooling air circulation:

• 7.5-15 kW models: Minimum 100mm above and below, 10mm on sides
• 18.5-55 kW models: Minimum 150mm above and below, 10mm on sides

The drive must be installed vertically with cooling air flowing from bottom to top. Blocking the airflow paths will cause thermal protection trips and reduce component service life.

Cover Removal and Installation

For wiring access, the lower cover can be removed by loosening the two captive screws using a hex wrench or by hand. The upper cover is factory-sealed and should only be removed by authorized service personnel. After wiring is complete, the lower cover must be reinstalled and the captive screws tightened to maintain the enclosure’s protection rating.

System Peripheral Components

The CP600 system architecture recommends the following peripheral components:

• Circuit breaker: Short-circuit protection and main disconnect
• Fuse: Semiconductor device protection
• Electromagnetic contactor: Drive power control (avoid frequent cycling; minimum 1-hour interval)
• Input reactor: Power factor improvement and harmonic suppression
• EMC filter: Emission reduction and immunity improvement
• Output reactor: Recommended when motor cable exceeds 100m; protects motor insulation from dv/dt stress
• dv/dt reactor: Optional; protects motor insulation and reduces bearing currents
• Output magnetic ring: Reduces bearing currents for motor protection
• Emergency stop button: Connected to DI1 for immediate compressor shutdown
• Pressure sensor: 24V DC powered, 4-20mA output, connected to P+/P- terminals
• Temperature sensor: PT100, connected to PT+/PT- terminals

The CP600 series exemplifies Inovance’s approach to integrated compressor drive design, where the dual-output architecture and built-in compressor control logic eliminate the need for external control components while providing the flexibility to handle a wide range of compressor types and operating scenarios. The combination of wall-mounted and floor-standing form factors allows the CP600 to be deployed in diverse installation environments, from compact workshop compressors to industrial compressor room installations.