In daily work, we often encounter situations where the frequency inverter has no response after being powered on. Generally speaking, if a frequency inverter malfunctions, it will display the corresponding fault code. So, what could be the reason for the lack of response? Then how should it be investigated?
01 Troubleshooting Methods
1. Check the power switch: First, confirm the power-on status of the power switch. A problem with the power switch can cause the frequency inverter to fail to start normally. Replacing the switch will solve the problem.
2. Static test: Use a multimeter to measure the resistance value of the frequency inverter. Set the multimeter to the X10 resistance range, connect the red test lead to the P terminal of the frequency converter, and connect the black test leads to R, S, and T in sequence. The measurement result is approximately a resistance value of several tens of ohms and is basically balanced. Next, swap them. Connect the black test lead to terminal P and the red test lead to R, S, and T in sequence. The measurement result will be a resistance value close to infinity. Then connect the red test lead to the N terminal and repeat the above process. If the result is the same, the static test is normal.
3. Dynamic test: Start the frequency inverter under no-load conditions and observe the output voltages of the U, V, and W phases. Check for any issues such as phase loss or three-phase imbalance. It might be due to faults in components like the module or the driver board. If the output voltage is normal, further load testing is required.
02 Solutions
1. Power failure: Check if the power supply is normal and ensure it can be connected
2. Incorrect parameter Settings: Check the parameter Settings of the frequency converter to see if they match the motor
3. External control signal issues: Confirm whether the external control signals are normal, such as those from PLCS or other control devices
4. Module or driver board failure: During dynamic testing, issues such as phase loss and three-phase imbalance may occur, all of which are due to module or driver board failures
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