80 Planning the electrical installation
Implementing thermal overload and short-circuit protection
Protecting the drive and input power cable in short-circuits
Protect the drive and input cable with fuses as follows:
Size the fuses at the distribution board according to instructions given in chapter
Technical data, page 168. 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.
Circuit breakers
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.
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.
You can use the circuit breakers listed in chapter Technical data, page 172. Other
circuit breakers can be used with drive if they provide the same electrical
characteristics. ABB does not assume any liability whatsoever for the correct function
and protection with circuit breakers not listed below. Furthermore, if the
recommendations given by ABB are not obeyed, the drive can experience problems
that warranty does not cover.
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 current of the drive. No additional
protection devices are needed.
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