Operating Line Connection Components Via An Isolating Transformer - Siemens SINUMERIK 840D sl Manual

Connection of the Components
5.1 Power Supply Interface Variants
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
● 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
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.
5-4
occur.
grounded neutral conductor.
Guide for the SINUMERIK 840D sl machine configuring
Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0