11 PREVENTIVE AND CORRECTIVE MAINTENANCE
3BHS213401 E01 REV H ACS1000 AIR-COOLED USER MANUAL 164/184
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).
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
⚠
To check why the grounding switch is not released, complete the list Checking the release
conditions for the grounding switch.
1 L -> 0.0 rpm
Status ErthIsoClos
MotorSpeed 0.00 rpm
Power 0.0 %
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:
- 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.
To identify the components referred to in the check list, see the wiring diagrams
and Fig. 11-4.
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