CHAPTER 10 – PREVENTIVE AND CORRECTIVE MAINTENANCE 149
10.6.5 Connecting a grounding set
1. Connect the enclosure ground clamp (10-9: 1)
to the ground ball stud of the cabinet’s ground-
ing frame.
2. Use the telescopic insulating pole to connect
the busbar ground clamps (10-9: 3) to the
ground ball studs of the busbars, and to tighten
each connection.
The drive is now dead, and safe access is possible.
10.6.6 Emergency release of the door safety
switch
The door of the DFE-INU compartment is secured
with a safety switch (10-10: 1). The safety switch is
tied into an interlocking circuit that operates in
conjunction with the grounding switch of the drive
and the interlocks from the main circuit breaker of
the drive. The interlocking system ensures that:
• the main power can only be connected to the
drive if the door is securely closed, the ground-
ing switch is in position not grounded, and the
safety switch is in position locked.
• the door can only be opened if the main circuit
breaker is open, the DC-link is discharged, and
the grounding switch is in position grounded.
The door of the DFE-INU compartment can also not
be opened if
• the drive is disconnected from the auxiliary
power and
• the safety switch of the door is in position
locked.
If the auxiliary voltage is switched off and the door
is locked and cannot be opened, check the position
of the release dial of the safety switch. If the
release dial is in the locked position, unlock the
safety switch as described in the following section.
10-9 Four-way grounding
set
10-9
1. Telescopic insu
lating pole
2. Enclosure grou
nd clamp
3. Busbar ground
clamp
1
2
3
3
3
Hazardous voltages!
Touching energized components can be fatal.
• Before you unlock the safety switch, verify that
the drive system is de-energized and grounded
at the appropriate places.
• Do not unlock the safety switch permanently.
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