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 184) or Circuit breakers (UL) (page 185).
￭
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 correctly
• the motor cable type complies with the motor cable selection guidelines by
ABB
• the cable length does not exceed the allowed maximum length specified for
the drive
• the setting of parameter 99.10 Motor nominal power in the drive is equal with
the value given on the motor rating plate.
The electronic power output short-circuit protection circuitry meets the
requirements of IEC 60364-4-41 2005/AMD1.
￭
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.
North America: The local code (NEC) requires an overload protection and a
short-circuit protection for each motor circuit. Use, for example:
• manual motor protector
• circuit breaker, contactor and overload relay or
• fuses, contactor and overload relay.
Guidelines for planning the electrical installation 79
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