171 ACS2000 AFE 2MVA UM 3BHS355653 ZAB E01 REV. H
10.6.6 Unlocking doors of medium voltage
compartments
The doors of medium voltage compartments (2-14:
1, 2, 3) are tied into an interlocking circuit that
operates in conjunction with the grounding switch
and the interlocks from the main circuit breaker of
the drive.
The interlocking system ensures that:
• the main power cannot be connected to the
drive unless the doors are securely closed and
the grounding switch is in position not
grounded, and the safety switch is in position
locked.
• the doors can only be opened if the main circuit
breaker is open, the DC-link capacitors have
been discharged, and the grounding switch is in
position grounded.
The doors of medium voltage compartments can
also not be opened if the drive is disconnected
from the auxiliary power
If the auxiliary voltage is switched off and the
doors are locked and cannot be opened, unlock the
doors as described in the following section.
Do the following to release the doors of the
medium voltage compartments:
1. Open the door of the control compartment.
2. Open the swing frame.
3. To release the grounding switch, pull the yellow
wire.
4. Put the grounding switch to position grounded.
5. Open the door.
10-11 Unlocking the doors
of medium voltage
compartments
Hazardous voltages!
Touching energized components can be fatal.
Before you unlock the doors, verify that the drive
system is de-energized and grounded at the
appropriate places.
Do not unlock the doors permanently.
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