Electrical connection
9
9.1 Permissible line system congurations
In combination with the drive system, the motors are generally approved for operation on TN
and TT systems with grounded neutral and on IT systems.
In operation on IT systems, the occurrence of a rst fault between an active part and
ground must be signaled by a monitoring device. In accordance with IEC 60364-4-41 it is
recommended that the rst fault should be eliminated as quickly as practically possible.
In systems with a grounded external conductor, an isolating transformer with grounded
neutral (secondary side) must be connected between the line supply and the drive system
to protect the motor insulation from excessive stress. The majority of TT systems have a
grounded external conductor, so in this case an isolating transformer must be used.
9.2 Circuit diagram of the motor
You will nd information on the circuit and on connecting the motor winding and the auxiliary
equipment (e. g. temperature sensor, anti-condensation heating, etc.) in the circuit diagram.
The circuit diagram is in the terminal box for the cable connection.
1PH8 SIMOTICS M main motors
Conguration Manual, 12/2022, A5E51895839A 223
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