20 ACS550-02/U2 User’s Manual
Planning the electrical installation
Protection against short-circuit inside the drive or in the supply cable
Arrange the protection according to the following guidelines.
1) Size the fuses according to instructions given in section Fuses and circuit breakers
on page 295. 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 ACS550 can be used.
Fuses must be used with other circuit breakers. See section Fuses and circuit
breakers on page 295.
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 ionized 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
manufacturer’s instructions.
Note: Circuit breakers must not be used without fuses in the USA.
Ground fault protection
The drive is equipped with an internal ground fault protective function to protect the
drive against ground faults in the motor and the motor cable. This is not a personal
safety or a fire protection feature. The ground 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 ground leakage
current and may cause fault current circuit breakers to function.
Circuit diagram Short-circuit
protection
Protect the drive and
input cable with fuses
or a circuit breaker.
See footnotes 1) and
2).
~
~
M
3~
Distribution
board
Input cable
~
~
M
3~
Drive
1)
2)
I >
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