58 Planning the electrical installation
Protecting the drive against ground faults
The drive is equipped with an internal ground fault protective function to protect the
unit against ground faults in the motor and motor cable. This is not a personnel safety
or a fire protection feature. The ground fault protective function can be reduced with a
parameter 46.03 EARTH FAULT.
Residual current device compatibility
The drive is suitable to be used with residual current devices of Type B.
Note: The EMC filter of the drive includes capacitors connected between the main
circuit and the frame. These capacitors and long motor cables increase the ground
leakage current and may cause fault current circuit breakers to function.
Implementing the Safe torque off function
See chapter The Safe torque off function on page 333.
Using a contactor between the drive and the motor
The control of output contactor depends on how you use the drive. See also
Protecting the contacts of relay outputs on page 59.
• If a contactor is controlled by external control, open the contactor as follows:
1. Give a stop command to the drive.
2. Wait until the drive stops the motor.
3. Open the contactor.
WARNING! Do not open the output contactor when the drive is controlling
the motor. The control operates faster than the contactor opens its contacts.
If the contactor starts to open when the drive is controlling the motor, the
control tries to maintain the load current and increases the drive output voltage to the
maximum. This can cause damage to the contactor.
• If the contactor is controlled by drive, see parameter 03.07 MOT CONTACT
CTRL.
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