Siemens SINAMICS S110 Manual page 60

Mains connection and line-side power components
3.9 Line connection variants
NOTICE
Damage of the drive line-up when operating on an IT system without a motor reactor
If the drive unit is operated without a motor reactor in an IT system, a ground fault on the
motor side of the Power Modules can cause damage to the drive line-up or trip the
overcurrent protective equipment.
• Always operate the Power Modules in an IT system with motor reactors.
60
SINAMICS S110
Manual, 07/2015, 6SL3097-4AC10-0BP5