ABB ACH550-02-645A-4 [36/454] Earth fault protection

ABB ACH550-02-645A-4 [36/454] Earth fault protection
32 Preparing for installation
ACH550-02 User’s Manual
1) Size the fuses according to instructions given in section Input power
(mains) cables, fuses and circuit breakers on page 398. The fuses
will protect the input cable in short-circuit situations, restrict drive
damage and prevent damage to adjoining equipment in case of a
short-circuit inside the drive.
2) Circuit breakers which have been tested by ABB with the ACH550
can be used. Fuses must be used with other circuit breakers. See
section Circuit breakers on page 400.
The protective characteristics of circuit breakers depend on the
type, construction and settings of the breakers. There are also
limitations pertaining to the short-circuit capacity of the supply
network.
WARNING! Due to the inherent operating principle and
construction of circuit breakers, independent of the
manufacturer, hot ionised gases may escape from the breaker
enclosure in case of a short-circuit. To ensure safe use, special
attention must be paid to the installation and placement of the
breakers. Follow the manufacturers instructions.
Earth fault protection
The drive is equipped with an internal earth fault protective
function to protect the drive against earth faults in the motor and
the motor cable. This is not a personal safety or a fire protection
feature. The earth fault protective function can be disabled with
parameter 3017 EARTH FAULT.
The EMC filter of the drive includes capacitors connected
between the main circuit and the frame. These capacitors and
long motor cables increase the earth 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 OFF key( ) on the control panel of the
drive does not generate an emergency stop of the motor or
separate the drive from dangerous potential.

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