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Electrical connection
8.1
Permissible line systems
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 first fault between an active part and
ground must be signaled by a monitoring device. According to IEC 60364-4-41, it is
recommended that the first fault is removed as quickly as is 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.
SIMOTICS M-1FE1 synchronous built-in motors
Configuration Manual, 09/2019, A5E47872980B AA
8
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