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38 Planning the electrical installation
Supply disconnecting device
Install a hand-operated input disconnecting device (disconnecting means) between
the AC power source and the drive. The disconnecting device must be of a type that
can be locked to the open position for installation and maintenance work.
Europe
If the drive is used in an application which must meet the European Union Machinery
Directive 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.
Other regions
The disconnecting means must conform to the applicable safety regulations.
Thermal overload and short circuit protection
Thermal overload 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.
Protection against short-circuit in motor cable
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. No
additional protection devices are needed.
Protection against short-circuit in the supply cable or the drive
Protect the supply cable with fuses or circuit breakers. Fuse recommendations are
given in the chapter
IEC gG fuses or UL type T fuses will protect the input cable in short-circuit situations,
Technical
data. When placed at the distribution board, standard
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