ABB ACS800-U7, Hardware Manual

Page: 47 / 148

Planning the electrical installation
47
Protection against short-circuit inside the drive or in the supply cable
Arrange the protection according to the following guide lines.
1) Size the fuses according to instructions given in chapter Technical data . 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.
2) Circuit breakers which have been tested by ABB with the ACS800 can be used. Fuses must be used
with other circuit breakers. Contact your local ABB representative for the approved breaker types and
supply network characteristics.
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.
WARNING! Due to the inherent operating principle and construction of circuit breakers,
independent of the manufacturer, hot ionized gases may escape from the breaker
enclosure in case of a short-circuit. To ensure safe use, special attention must be paid to
the installation and placement of the breakers. Follow the manufacturer’s instructions.
Note: Circuit breakers must not be used without fuses in the USA.
3) Size the fuses according to local safety regulations, appropriate input voltage and the rated current of
the drive (see chapter Technical data) .
4) ACS800-07 units with enclosure extension are equipped with aR fuses as standard. ACS800-U7 units
are equipped with T/L fuses as standard. The fuses restrict drive damage and prevent damage to
adjoining equipment in case of a short-circuit inside the drive.
Circuit diagram Drive type Short-circuit
protection
DRIVE IS EQUIPPED WITH INPUT FUSES
ACS800-07
ACS800-U7 Protect the input cable
with fuses or a circuit
breaker according to
local regulations. See
footnotes 3) and 4).
Drive
Distribution
board
Input cable
~
~
M
3~
Drive
~
~
M
3~
3) 4)
4)
I
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