Thermal Overload And Short-Circuit Protection; Protection Against Short-Circuit Inside The Drive Or In The Supply Cable - ABB ACS350 User Manual

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Thermal overload and short-circuit protection

The drive protects itself and the input and motor cables against thermal overload
when the cables are dimensioned according to the nominal current of the drive. No
additional thermal protection devices are needed.
WARNING! If the drive is connected to multiple motors, a separate thermal overload
switch or a circuit breaker must be used for protecting each cable and motor. These
devices may require a separate fuse to cut off the short-circuit current.

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 chapter
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 ACS350 can be used. Fuses must be used
with other circuit breakers. Contact your local ABB representative for the approved breaker types and
supply network characteristics.
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.
Planning electrical installation
Circuit diagram
Distribution Input cable
board
1)
2)
Drive
M
3~
M
3~
Technical data. The fuses will protect the
Short-circuit
protection
Protect the drive and
input cable with fuses
or a circuit breaker.
See footnotes 1) and
2).