ABB ACS2000 AFE 2MVA User Manual page 168

CHAPTER 10 – PREVENTIVE AND CORRECTIVE MAINTENANCE
- The DC link discharges.
While the DC link discharges, the display
shows OffSeqOn:
600.0 rpm
1 L ->
OffSeqOn
StateINU
MOTOR SP 0.00 rpm
POWER
0.0 kW
When the DC link has discharged completely,
the status line displays ReadyOn and the SUP-
PLY OFF pushbutton changes to a permanent
light.
1 L -> 600.0 rpm
StateINU ReadyOn
MOTOR SP 0.00 rpm
POWER 0.0 kW
5. Rack-out, lock-out, ground and tag-out the
main power feeder.
6. Wait until the yellow lamp GROUNDING SWITCH
UNLOCKED lights up.
The lamp 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.
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
why the lamp does not light 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 is not
released for closing.
If the lamp is on, continue with Grounding.
If the yellow lamp is not on, continue with
Grounding switch is not
10.6.4
released.
Grounding
7. If the yellow lamp GROUNDING SWITCH
UNLOCKED is on, 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:
1 L -> 600.0 rpm
StateINU DCGnd NOpen
MOTOR SP 0.00 rpm
POWER 0.0 kW
8. If necessary, open the doors of medium voltage
compartments.
—
To open the AFE-INU compart-
ment door, auxiliary voltage is
required.
9. Switch off and lockout all auxiliary voltages
from external sources.
10. Verify that the drive system is de-energized.
11. To connect a grounding set, continue with
10.6.5 Connecting a grounding
10.6.4 Grounding switch is not released
When the DC link of the drive has been discharged,
the lamp GROUNDING SWITCH UNLOCKED lights
up to indicate that the grounding switch is
released and can be turned to the grounded posi-
tion. If the lamp does not light up, proceed as fol-
lows:
1. Do not force the grounding switch in any direc-
tion.
2. To test the lamp GROUNDING SWITCH
UNLOCKED, activate the lamp test with param-
eter 16.7.
(For information on setting parameters, see
Parameter mode).
- If the lamp does not light up, replace it.
- If the lamp lights up after it was replaced,
continue with step 7..
- If the lamp does not light up after it was
replaced, continue with step 3..
3. Verify that the MCB (main circuit breaker) is
open.
- If the MCB is open, check that it is locked
out.
- Check that the SUPPLY OFF lamp is lit.
If the lamp is lit, the feedback signal "main
circuit breaker open" is present (digital
input DI09 of I/O module A3411).
168
DCGnd Nopen
NotReadyOn
AFE NotRdy
set.
9.6