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Installation in corner-grounded
network and IT system
Corner grounding and IT system are allowed for all the
drive types.
In these circumstances the EMC protection class must
be changed to level C4. This is done by removing the
built-in EMC Screw with a simple procedure described
below.
In addition on FR2 and FR4 the MOV screw is required
to be removed, see Figure below for FR2 & FR4.
Do not perform any modifications on the AC drive
when it is connected to mains.
Electric shock hazard—risk of injuries! Carry out
wiring work only if the unit is de-energized.
After disconnecting the supply, wait at least five
minutes before removing the cover to allow the
intermediate circuit capacitors to discharge.
Failure to follow these instructions will result in
death or serious injury.
Remove the main cover of the AC drive and remove
the EMC/MOV screws depending on frame size (see
Following Figures). Once the screw is removed, it
can be reconnected to re-engage the EMC
protection.
Verifying Rotation
When starting the compressor up for the first time, verify it is running in the correct direction. For pumps or
compressors verify your discharge pressure starts to increase and your suction decreases. For fans make sure it
is blowing air in the correct direction. If it is running in reverse, please see the box in the above diagram.
Locations of EMC Screw in Frame 1 and Frame 3
Locations of EMC and MOV Screws for Frame 2 and
Frame 4
Locations of the EMC Screws in Frame 5 and Frame
6
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