Ground Fault Protection; Emergency Stop Devices; Restarting After An Emergency Stop; Power-Loss Ride-Through Function - ABB ACS800-04 Hardware Manual

48 Planning the electrical installation

Ground fault protection

The drive has ground fault protection in the motor and motor cable. This is not a
personal safety or a fire protection feature. The ground fault protection can be
disabled with a parameter, refer to the applicable firmware manual.
The EMC filter of the drive has capacitors between the main circuit and the frame.
These capacitors and long motor cables increase the ground leakage current and can
cause fault-current circuit breakers to function.

Emergency stop devices

For safety reasons, install the emergency stop devices at each operator control
station and at other operating stations where an emergency stop may be needed.
Note: Pressing the stop key ( ) on the control panel of the drive does not generate
an emergency stop of the motor or separate the drive from dangerous potential.

Restarting after an emergency stop


After an emergency stop, the emergency stop button must be released and the drive
started by turning the operating switch of the drive from position "ON" to "START".

Power-loss ride-through function

The power-loss ride-through function is activated when parameter
20.06 UNDERVOLTAGE CTRL is set to ON (default in Standard Control Program).