ABB ACS550-02 User Manual page 11

Supply Connection
Disconnecting Device (Means)
Install a hand-operated input disconnecting device between the AC power source
(MCC) and the drive. The disconnecting device must be of a type that can be locked
to the open position for installation and maintenance work.
EU
To meet the European Union Directives, according to standard EN 60204-1, Safety
of Machinery, the disconnecting device must be one of the following types:
• a switch-disconnector of utilization category AC-23B (EN 60947-3)
• a disconnector that has an auxiliary contact that in all cases causes switching
devices to break the load circuit before the opening of the main contacts of the
disconnector (EN 60947-3)
• a circuit breaker suitable for isolation in accordance with EN 60947-2.
US
The disconnecting means must conform to the applicable safety regulations.
Fuses
See Technical Data:
Thermal Overload and Short-circuit Protection
The drive protects itself and the input and motor cables against thermal overload
when the cables are dimensioned according to the nominal current of the drive. No
additional thermal protection devices are needed.
WARNING! If the drive is connected to multiple motors, a separate thermal overload
switch or a circuit breaker must be used for protecting each cable and motor. These
devices may require a separate fuse to cut off the short-circuit current.
The drive protects the motor cable and the motor in a short-circuit situation when the
motor cable is dimensioned according to the nominal current of the drive.
Mains Cable (AC line cable) Short-circuit Protection
Always protect the input cable with fuses. Standard gG (US: T or L) fuses will protect
the input cable in short-circuit situations and prevent damage to adjoining equipment
in case of a short-circuit inside the drive.
Size the fuses according to local safety regulations, appropriate input voltage and
the rated current of the drive. For fuse ratings, see Technical Data .
Input Power Cables and Fuses on page 182 .
Installation
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