Planning the electrical installation
48
Ground fault protection
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 personal safety
or a fire protection feature. The ground fault protective function can be disabled with
a parameter, refer to the appropriate ACS800 Firmware Manual.
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.
Emergency stop devices
For safety reasons, install the emergency stop devices at each operator control
station and at other operating stations where 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.
An emergency stop function is optionally available for stopping and switching off the
whole drive. Two stop categories according to IEC/EN 60204-1:1997 are available:
immediate removal of power (Category 0 for ACS800-07/U7) and controlled
emergency stop (Category 1 for ACS800-07/U7).
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).
ACS800-07/U7 units with line contactor (+F250)
The power-loss ride-through function is enabled by connecting RMIO board
terminals X22:8 and X22:11 with a jumper.
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