ABB ACS880-04F-504A-3, Руководство по оборудованию, Страница: 74 / 202

Protecting the drive, input power cable, motor and motor
cable in short circuit situations and against thermal
overload
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Protecting the drive and the input power cable in short-circuits
Protect the drive (1) with fuses (a) and the input cable with fuses (b) or a circuit breaker.
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b a
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Size the fuses or the circuit breaker according to local regulations for the input cable
protection. Select the fuses 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.
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. Your local ABB representative can help you in selecting
the breaker type when the supply network characteristics are known.
Note: Circuit breakers must not be used without fuses.
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.
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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.
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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.
74 Guidelines for planning the electrical installation