Maintain 5.0 bar of pressure in a water pipe using a 4-20mA pressure sensor.
In the world of motor speed control, the Convo CVF G3 series has established itself as a reliable, cost-effective solution for industrial and commercial applications. Whether you are running a conveyor belt, a pump, a fan, or a piece of CNC machinery, this inverter offers robust performance. However, like any sophisticated piece of equipment, unlocking its full potential requires a deep understanding of its operation—and that begins with the .
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. One of the most common uses for the CVF G3 is pump or fan control using a sensor (e.g., pressure transducer). The manual dedicates a full chapter to PID (Proportional-Integral-Derivative) control. Convo Inverter Cvf G3 Manual
| Error Code | Name | Likely Cause (Per Manual) | Solution | | :--- | :--- | :--- | :--- | | | 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. |
Introduction
If your transducer reads 4mA at 0 bar and 20mA at 10 bar, the manual explains how to scale analog inputs using parameters like F4.15 (AI min input) and F4.18 (AI max corresponding percentage). Part 6: Troubleshooting – Error Codes in the CVF G3 Manual When the inverter stops with a red light, the manual’s error code table is your savior. Here are the most common ones:
| Parameter | Value | Explanation (from manual) | | :--- | :--- | :--- | | | 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) | Maintain 5
| Parameter | Value | Explanation | | :--- | :--- | :--- | | | 1 | Terminal command (Use external switch or keypad for start) | | F0.01 | 6 | Frequency source = PID output | | F6.00 | 1 | Enable PID function | | F6.01 | 1 | PID given target from keypad (settable) | | F6.02 | 0 | PID feedback from AI (4-20mA) | | F6.07 | 5.00 | Desired pressure (5.0 Bar). This is the setpoint. | | F6.08 | 0.50 | Proportional gain (P) – Increase for faster response | | F6.09 | 2.00 | Integral time (I) – Lower for quicker correction | | F6.10 | 0.00 | Derivative (D) – Usually 0 for pump systems |