Line connection and line-side power components
3.9 Active Interface Modules internal air cooling
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
133
Operation on an isolated-neutral system (IT system)
IT system
In IT systems, all live parts are isolated from ground, or one point is connected to ground
through an impedance. The exposed conductive parts of the electrical installation are either
grounded separately or grounded together, or jointly connected to the system ground.
Only Line Modules without line filters are to be operated on this system type. The emitted
interference can exceed the limit values of category C3. The Active Interface Module must
be set for operation on an IT system.
Operating an Active Interface Module on an isolated-neutral line supply (IT line supply)
Note
When an Active Interface Module is operated on an isolated
-neutral line supply (IT system),
the connection bracket for the interference
-suppression capacitor in the Active Interface
Module must be removed. The connection bracket for the interference
-
suppression capacitor
is located on the lower side of the component.
nnection bracket for the interference-suppression capacitor is not removed, an
insulated supply will be grounded and may cause tripping of the isolation monitor in the case
of failure.
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. It nevertheless makes sense to install an Active Interface Module because the clock
frequency filter is still active and also protects other loads on the same network from clock
frequency disturbances.
Danger to life caused by electric shock when the connection bracket is removed
Because of the capacitors, a hazardous voltage is present for up to 5 minutes after the
power supply has been switched off.
Contact with live parts can result in death or serious injury.
• Wait 5 min. after the supply has been switched off before removing the connection
bracket.
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