Planning the electrical installation 43
Protecting the drive, input power cable, motor and motor
cable in short circuit situations and against thermal
overload
Protecting the drive and input power cable in short-circuit situations
Arrange the protection according to the following guidelines.
1)
Size the fuses according to instructions given in chapter Technical data on page 357. 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 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.
Protecting the motor and motor cable in short-circuit situations
The drive protects the motor and motor cable in a short-circuit situation when the
motor cable is dimensioned according to the nominal current of the drive. No
additional protection devices are needed.
Protecting the drive, motor cable and input power cable against
thermal overload
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.
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
I >
1)
2)
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