3BHS212794 E01 REV M
ACS6000
USER MANUAL
233/278
10 PREVENTIVE AND CORRECTIVE MAINTENANCE
5.
Wait for the yellow lamp
GROUNDING SWITCH UNLOCKED
on the CBU
to light up (see Fig. 10-7).
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
.
Figure 10-7 Grounding switch ungrounded
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.
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.
(1) Yellow light on: Grounding switch
is unlocked and can be operated
(2) Grounding switch:
Ungrounded position
1
2
