Connection of the Components
5.1 Power Supply Interface Variants
Guide for the SINUMERIK 840D sl machine configuring
5-4 Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0
5.1.4 Operating line connection components via an isolating transformer
The isolating transformer converts the network configuration of the system (e.g. IT/TT
system) to a TN system. Additional voltage adaptation to the permissible voltage tolerance
range is possible.
An isolating transformer must be used in the following cases:
● The insulation of the Motor Module and/or the motor is not suitable for the voltages that
occur.
● There is no compatibility with an existing residual-current protective device.
● The installation altitude is higher than 2000 m above sea level.
● A line filter should be used in a line supply system that is not a TN line supply system with
grounded neutral conductor.
Caution
If the supply voltage is greater than 480 V +10 %, it is not permissible to use an
autotransformer.
An isolating transformer must be used to ensure protective separation.
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