Grounding Switch Ungrounded - ABB ACS6000 User Manual

5. Wait for the yellow lamp GROUNDING SWITCH UNLOCKED on the CBU
to light up (see Fig. 10-7).
CAUTION! If the lamp does not light up, DO NOT force the grounding
switch in any direction before you know the reason why the lamp has
not lit up. If you try, the following can happen:
• The switch closes when the DC link is still energized and short-
circuits the DC-link capacitors. The short-circuit manifests itself in
a loud bang.
• The switch is damaged because it was not released for closing.
• Components inside the drive are damaged.
IMPORTANT! If the yellow lamp does not turn on, continue with"10.4.3
Grounding the drive when the grounding switch is not released"
on page 234, otherwise continue with step 6.
(1) Yellow light on: Grounding switch
is unlocked and can be operated
6. If the yellow lamp GROUNDING SWITCH UNLOCKED is on, keep the
yellow lamp cap pressed while you turn the grounding switch to the
grounded position.
3BHS212794 E01 REV M
1
Figure 10-7 Grounding switch ungrounded
ACS6000 USER MANUAL
10 PREVENTIVE AND CORRECTIVE MAINTENANCE
2
(2) Grounding switch:
Ungrounded position
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