Diagnostic & Troubleshooting 6 - 18
If the Ground Fault Interrupter Operates When the Drive is Run
The Drive performs internal switching, so there is a certain amount of leakage current. This may cause the ground fault
interrupter to operate and cut off the power supply. Change to a ground fault interrupter with a high leakage detection level
(i.e., a sensitivity current of 200 mA or greater per Unit, with an operating time of 0.1 s or more), or one that incorporates high
frequency countermeasures (i.e., one designed for use with Drives). It will also help to change the Drive's Carrier Frequency
Selection (C6-02) to lower the carrier frequency. In addition, remember that the leakage current increases as the cable is
lengthened.
If There is Mechanical Oscillation
Use the following information when there is mechanical oscillation.
The application is making unusual sounds.
The following causes are possible.
There may be resonance between the mechanical system's characteristic frequency and the carrier
frequency.
This is characterized by the motor running with no problems and the machinery oscillating with a high-pitched whine. To
prevent this type of resonance, adjust the carrier frequency with parameters C6-02 to C6-05.
There may be resonance between an applications characteristic frequency and the output frequency of the
Drive.
To prevent this from occurring, either use the jump frequency functions in parameters d3-01 to d3-04, or install rubber pad-
ding on the motor base to reduce oscillation.
Oscillation and hunting are occurring with V/f control.
The gain adjustment may be insufficient. Reset the gain to a more effective level by raising the value of C4-02 (Torque
Compensation Primary Delay Time Parameter) and then lowering the setting of n1-02 (Hunting Prevention Gain).
Oscillation and hunting are occurring with PI control.
If there is oscillation or hunting during PI control, check the oscillation cycle and individually adjust P and I parameters.
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