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2.2.3
Electrical configuration
Power supply
To ensure the supply of the Frequency Converter both the supply voltage for the
electronic components and sensors and the load voltage (possibly using a power
module) must be connected to the basic module.
Galvanic isolation
Warning
!
Please note that, if the motor is not controlled, it remains electrically connected to
the power supply (3 x 400 VAC).
When working on the connecting terminal plate (or opening the motor housing),
disconnect the motor cable from the frequency converter to ensure electrical
isolation.
EMC measures/grounding
The Frequency Converter should be installed on the wide rail.
The screw-type terminal marked with ground symbol on the front of the heat sink
must be connected with a short ground cable to the protective ground of the
system (refer to the corresponding standard).
To avoid EMC problems, particular care must be exercised when shielding the
motor connecting cable. The shields of the motor connecting cable must be
connected:
S To the metallic DESINA connector on the Frequency Converter in such a way
as to ensure electromagnetic compatibility
S To the metal connection housing of the motor via an EMC-compatible, metal
heavy-gauge threaded joint.
The motor housing must be grounded.
EM 148-FC Frequency Converter
A5E00065321-03
Wiring
2-7
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