ABB ACS880-M04, Hardware Manual

Page: 66 / 195

66 Planning the electrical installation
Implementing thermal overload and short-circuit protection
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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 on page 109 . The fuses 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.
Note: If you want to use circuit breakers, contact ABB for more information.

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.

Protecting the drive and the input power and motor cables against
thermal overload
The drive protects itself and the input and motor cables against thermal overload
when the cables are sized according to the nominal current of the drive. No additional
thermal protection devices are needed.
WARNING! If the drive is connected to multiple motors, use a separate circuit
breaker or fuses for protecting each motor cable and motor against overload.
The drive overload protection is tuned for the total motor load. It may not trip due to
an overload in one motor circuit only
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