Customer feedback
Why does the motor casing have a static voltage when an inverter is used?
Since the inverter outputs a PWM waveform, the high-frequency pulse sequence approximates a standard sine wave, and its spectral envelope contains harmonic components. The transient voltage amplitude and frequency are extremely high, which can induce significant voltage across the motor winding capacitance between the high-voltage field and the motor casing, thereby generating even higher voltages (the converter casing itself carries a certain static voltage level). For this reason, when using a variable-frequency drive, it is crucial to heed a warning: ensure reliable grounding. Furthermore, in industrial environments, it is common for there to be no dedicated ground wire; instead, the neutral line is often shared with other circuits. As a result, many grounded equipment enclosures end up sharing the same grounding system as the VFD. This can lead to the buildup of high-voltage static electricity throughout the entire system. Such high voltages generate strong electric fields that may interfere with the normal operation of the VFD. If this situation occurs, simply integrating a single VFD control system into the overall setup can effectively eliminate the problem.
What are the causes of the inverter’s secondary fault?
Could you please confirm what’s wrong with the machine? You can call our customer service hotline at 400-0411-755.
After using the P1550 inverter, a motor parameter auto-tuning fault occurs. What should be done?
If a motor parameter auto-tuning fault occurs, the possible causes are as follows:
Possible Cause 1:
Motor parameters are not set according to the motor nameplate.
Checking Method:
Check whether parameters b0.00 – b0.05 are set according to the motor nameplate.
Corrective Action:
Set the motor parameters accurately according to the motor nameplate.
Possible Cause 2:
Motor parameter auto-tuning process times out.
Checking Method:
1. Check whether the motor is connected.
2. Check whether the contactor between the inverter and the motor is closed.
Corrective Action:
Ensure that the cables between the inverter and the motor are securely and correctly connected.
Possible Cause 3:
Encoder abnormality.
Checking Method:
When using PG vector control, check whether the encoder feedback is correct.
Corrective Action:
Check whether the encoder pulse number setting is correct and ensure that the encoder signal cables are correctly and securely connected.
The converter suddenly displayed an incorrect code, and I can’t get it working again. What should I do now?
Hello, the machine has malfunctioned. Please contact our company’s service hotline at 400 0411 755. Our service engineers will guide you on how to diagnose or resolve the machine’s issue.
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