Convo Inverter Cvf G3 Manual < 100% LATEST >
When the inverter stops with a red light, the manual’s error code table is your savior. Here are the most common ones:
| Error Code | Name | Likely Cause (Per Manual) | Solution | | :--- | :--- | :--- | :--- | | Err.OC1 | Overcurrent at acceleration | Short circuit, wrong motor parameters, or too fast ramp | Increase acceleration time (F2.00). Check motor insulation. | | Err.OC2 | Overcurrent at deceleration | Braking resistor missing, regenerative overvoltage | Add braking resistor or increase decel time (F2.01). | | Err.OC3 | Overcurrent at constant speed | Load shock, mechanical jam | Reduce load or check gearbox. Enable torque limit (F7.xx). | | Err.Ou1 | Overvoltage | Inverter braking too much energy | Increase decel time or install braking unit. | | Err.Ou2 | Undervoltage | Input power sag, missing phase on R,S,T | Check incoming supply voltage and wiring. | | Err.OH | Overheat | Fan failure, ambient too high ( >40°C) | Clean heatsink, replace fan. Reduce carrier frequency (F0.19). | | Err.SC | Short circuit | Motor wiring short to ground | Use a megger to test motor and cable. |
Silent Tip from the manual: If you see Err.OL (overload), do not simply increase the motor rated current. Instead, check parameter F6.02 (overload protection level). Setting this above the motor’s actual FLA will void the motor warranty and can cause a fire.
The manual dedicates several pages to the control terminal block. Standard CVF G3 units have:
| Terminal | Signal | Description (Per Manual) | | :--- | :--- | :--- | | +10V | Analog Reference | 10V DC output for external potentiometer | | VI | Analog Input | 0-10V speed reference | | AI | Analog Input | 4-20mA current signal (for pressure transducers) | | ACM | Common | Analog common ground | | FOR | Digital Input 1 | Forward run command | | REV | Digital Input 2 | Reverse run command | | DCM | Digital Common | Digital ground | | TA/TB/TC | Relay Output | Fault or run status (NO/NC/COM) |
Pro Tip: The manual explicitly states that unshielded control wiring should be less than 20 meters. For longer runs, use shielded cable with the shield grounded at the inverter end only.
2.1 Installation Environment
2.2 Mechanical Installation
2.3 Main Circuit Wiring
Terminal Function Identification: | Terminal | Function | Description | | :--- | :--- | :--- | | L1, L2 (or R, S, T) | AC Input | Connect to commercial power supply (Single phase or 3-phase). | | U, V, W | AC Output | Connect to the 3-phase induction motor. Do NOT connect to power supply! | | P+, PB | Brake Resistor | Terminals for connecting an external brake resistor (if applicable). | | P+, P- | DC Bus | DC link terminals. | | PE | Ground | Earth ground terminal. Must be grounded according to local regulations. |
WARNING:
2.4 Control Circuit Wiring The control terminal block (usually removable) is located at the bottom front.
Typical Control Terminals:
Note: Use shielded twisted-pair cables for control wiring and separate them from main power cables to prevent noise interference.
The CVF G3 has clearly marked power terminals:
Common Mistake: Connecting input power to U, V, W will instantly destroy the inverter’s output IGBTs. The manual stresses this with a bold warning symbol.
For industrial automation, the CVF G3 supports Modbus RTU via the RJ45 port (or terminal block, depending on revision). The manual provides a complete register map.
Basic Communication Setup (Per Manual):
| Parameter | Setting | Meaning | | :--- | :--- | :--- | | FA.00 | 1 to 247 | Slave address (unique for each inverter on network) | | FA.01 | 3 | Baud rate: 9600 bps (most common) | | FA.02 | 1 | 8-N-1 data format (8 data, no parity, 1 stop) | Convo Inverter Cvf G3 Manual
Common Holding Registers (Addresses):
If your PC or PLC cannot communicate, the manual advises checking FA.03 (response delay) and ensuring termination resistors (120 ohms) are installed on long networks.
Let’s walk through a typical first-time setup as outlined in the manual.
Goal: Run a 2.2kW motor using the keypad START/STOP buttons and adjust speed via the keypad potentiometer.
| Parameter | Value | Explanation (from manual) | | :--- | :--- | :--- | | F0.00 | 0 | 0 = Keypad command (Run/Stop from inverter keys) | | F0.01 | 0 | 0 = Keypad potentiometer for frequency setting | | F1.01 | 380V (or 220V) | Motor rated voltage (from motor nameplate) | | F1.02 | 5.0A | Motor rated current (critical for overload protection) | | F1.03 | 1420 RPM | Motor rated speed | | F2.00 | 5.0 sec | Acceleration time from 0Hz to 50Hz | | F2.01 | 5.0 sec | Deceleration time (increase if overvoltage trips) |
After writing these parameters (press 'SET' to save), pressing the green 'RUN' button will spin the motor at 0Hz, then ramp to 50Hz. Turn the potentiometer to change speed. When the inverter stops with a red light,