Siemens SINAMICS S120 Equipment Manual page 95

Operating an Active Interface Module from an isolated-neutral network (IT system)
When an Active Interface Module is operated in an isolated-neutral system (IT system), the
connection bracket for the interference-suppression capacitor must be removed.
The connection bracket for the interference-suppression capacitor is located on the lower
side of the component.
There are no limits of interference for isolated-neutral systems. Removing the connection
bracket to the interference-suppression capacitor eliminates the effect of the filter against
ground. However, it nevertheless makes sense to install an Active Interface Module
because the clock frequency filter is still effective and also protects other loads on the
same network from clock frequency disturbances.
The connecting bracket may only be removed in the de-energized state.
Risk of electric shock. Dangerous voltages are still present for up to 5 minutes after the
power supply has been switched off.
CAUTION
If the connection bracket for the interference-suppression capacitor is not removed, an
insulated supply will be grounded and may cause destruction of the isolation monitor in the
case of failure.
Remove the connection bracket for the
interference-suppression capacitor with
a Tx25 screwdriver.
Booksize power units
Manual, (GH2), 06/2008, 6SL3097-2AC00-0BP6
DANGER
Remove the connection bracket.
Line Connection Booksize
2.9 Active Interface Modules internal air cooling
Connection bracket for the
interference-suppression capacitor
95