Siemens SINAMICS S120 Manual page 85

Removing the connection clip on an ungrounded power network
Failure to remove the connection clip to the basic interference suppression module on an
ungrounded line supply (IT system) can cause significant damage to the device.
Removing the connector jumper on the VSM10 Voltage Sensing Module
When operating the Active Interface Module on an ungrounded line supply (IT system), at
the Voltage Sensing Module (VSM10), remove the connector jumper in terminal X530 at the
lower side of the component.
Use two screwdrivers or another suitable tool to relieve the holding springs in the terminal
and then withdraw the connector jumper.
Terminal X530 with connector jumper
Chassis power units
Manual, (GH3), 01/2013, 6SL3097-4AE00-0BP3
WARNING
Line-side power components
2.6 Active Interface Modules
Relieve the springs and withdraw the connector
jumper
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