Planning the electrical installation
45
Permanent magnet synchronous motor
Only one permanent magnet synchronous motor can be connected to the inverter
output.
It is recommended to install a safety switch between the permanent magnet
synchronous motor and the drive output. The switch is needed to isolate the motor
during any maintenance work on the drive.
Supply connection
Disconnecting device (disconnecting means)
The drive is equipped with a hand-operated input disconnecting device
(disconnecting means) which isolates the drive and the motor from the AC power as
standard. The disconnecting device does not, however, isolate the input busbars
from the AC power. Therefore, during installation and maintenance work on the
drive, the input cables and busbars must be isolated from the input power with a
disconnector at the distribution board or at the supplying transformer.
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:
• switch-disconnector of utilization category AC-23B (EN 60947-3)
• 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)
• circuit breaker suitable for isolation in accordance with EN 60947-2.
US
The disconnecting means must conform to the applicable safety regulations.
Fuses
See section Thermal overload and short-circuit protection on page 46.
Main contactor
If used, dimension the contactor according to the nominal voltage and current of the
drive. The utilization category (IEC 947-4) is AC-1.
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