Circuit Breakers; Protecting The Motor And Motor Cable In Short-Circuits; Protecting The Motor Cables Against Thermal Overload - ABB ACS880-11 Hardware Manual

Size the fuses or circuit breakers according to local regulations for the input cable
protection. Select the fuses or circuit breakers for the drive according to the instructions
given in the technical data. The fuses for the drive protection will restrict drive damage
and prevent damage to adjoining equipment in case of a short-circuit inside the drive.
Note: If the fuses or circuit breakers for the drive protection are placed at the distribution
board and the input cable is dimensioned according to the nominal input current of the
drive given in the technical data, the fuses or circuit breakers protect also 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. No separate fuses or circuit breakers
for the input cable protection are needed.
WARNING!
Due to the inherent operating principle and construction of circuit breakers,
independent of the manufacturer, hot ionized gases can escape from the breaker
enclosure in case of a short-circuit. To ensure safe use, pay special attention to
the installation and placement of the breakers. Obey the manufacturer's
instructions.
￭

Circuit breakers

See section Circuit breakers (IEC) (page 177)
￭

Protecting the motor and motor cable in short-circuits

The drive protects the motor cable and motor in a short-circuit situation when the motor
cable is sized according to the nominal output current of the drive.
￭

Protecting the motor cables against thermal overload

The drive protects the motor cables against thermal overload when the cables are sized
according to the nominal output current of the drive. No additional thermal protection
devices are needed.
WARNING!
If the drive is connected to multiple motors, use a separate overload protection
for each motor cable and motor. The drive overload protection is tuned for the
total motor load. It may not detect an overload in one motor circuit only.
Guidelines for planning the electrical installation 73
or Circuit breakers (UL) (page
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177).
M
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