ABB ACS2000 DFE - Page 147

CHAPTER 10 – PREVENTIVE AND CORRECTIVE MAINTENANCE 147
- The DC link discharges.
While the DC link discharges, the display
shows OffSeqOn.
4. Rack-out, lock-out, ground and tag-out the
main power feeder.
5. Wait until the yellow pushbutton GROUNDING
SWITCH UNLOCKED lights up.
The pushbutton lights up when cooling of the
drive has stopped. Cooling is stopped after a
delay time (default setting: 10 min.) has
elapsed. The delay time is triggered, when the
main power feeder is disconnected.
If the pushbutton lights up, continue with
Grounding.
If the pushbutton does not light up, continue
with 10.6.4 Grounding switch is not released.
Grounding
6. If the yellow pushbutton GROUNDING SWITCH
UNLOCKED lights up, turn the grounding switch
to the grounded position.
When the grounding switch is in the grounded
position, the CDP control panel shows the fol-
lowing:
7. If necessary, open the doors of medium voltage
compartments.
—
To open the DFE-INU compart-
ment door, auxiliary voltage is
required.
8. Switch off and lockout all auxiliary voltages
from external sources.
9. Verify that the drive system is de-energized.
10. To connect a grounding set, continue with
10.6.5 Connecting a grounding set.
CAUTION
!
If the GROUNDING SWITCH UNLOCKED pushbutton
does not light up, press it: this pushbutton also
works as a test lamp to verify its functionality.
It is important that you do not force the grounding
switch in any direction before you know the reason
of malfunctioning. If you try, the following can
happen:
• The switch closes when the DC link is still ener-
gized and short-circuits the DC-link capacitors.
The short-circuit manifests itself in a loud bang.
• The switch is damaged because it is not
released for closing.
1 L ->
600.0 rpm
StateINU
OffSeqOn
MOTOR SP 0.00 rpm
POWER
0.0 kW
1 L ->
600.0 rpm
StateINU
DCGnd NOpen
MOTOR SP 0.00 rpm
POWER
0.0 kW
DCGnd Nopen
NotReadyOn
NotRdy