Grounding; Grounding Switch Is Not Released - ABB ACS1000 User Manual

11.6.3

Grounding

1. If the yellow lamp is on, turn the grounding switch to the grounded position.
When the grounding switch is in the grounded position, the status line of the CDP control
panel displays ErthIsoClos.
(Earth isolator closed = grounding switch is in grounded position).
1 L ->
Status
MotorSpeed 0.00 rpm
Power
2. To de-energize the drive completely, switch off and lockout all auxiliary voltages from
external sources.
Note: To open the doors of medium voltage compartments and additional cabinets of the
drive that are equipped with an electromechanical lock, you need to have the auxiliary
voltage switched on.
3. If necessary, connect a grounding set.
11.6.4

Grounding switch is not released

⚠
CAUTION
Hazardous voltage!
If the lamp GROUNDING SWITCH UNLOCKED does not light up, do not force the
grounding switch in any direction before you know the reason why the lamp does
not light up; otherwise, the following can happen:
-
-
To check why the grounding switch is not released, complete the list Checking the release
conditions for the grounding switch.
To identify the components referred to in the check list, see the wiring diagrams
and Fig. 11-4.
3BHS213401 E01 REV H
0.0 rpm
ErthIsoClos
0.0 %
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.
ACS1000 AIR-COOLED USER MANUAL
11 PREVENTIVE AND CORRECTIVE MAINTENANCE
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