ABB ACS1000i air-cooled, User Manual

Page: 164 / 174

11 PREVENTIVE AND CORRECTIVE MAINTENANCE
3BHS206977 E01 REV H ACS1000I AIR-COOLED USER MANUAL 164/174
11.6.5 Checking the release conditions for the grounding switch
1. Check that the auxiliary voltage is switched on.
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2. Check that the main power supply is disconnected from
the drive.
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a) Check that the MCB is open.
When the MCB is open, secure it against closing.
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b) Check that the feedback signal "MCB is open" arrives at the drive, ie, if the
following indicators are lit:
- LED of digital input DI08 of I/O module -A5201 (-A2)
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- MAIN SUPPLY ON pushbutton -S5152 (-S2)
When the LED and the pushbutton are lit, the feedback signal "MCB is
open" has arrived at the drive.
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- If the pushbutton is not lit:
- Check if the 24 V blade-type fuse (X27_P2:14) is blown.
The fuse protects the control circuit of the pushbutton.
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- If the LED is not lit:
- Check the control-signal wiring between switchgear and drive as
per applicable wiring diagram.
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3. Checking the discharge level of the DC link.
- Check if the value of parameter 2.06 DC VOLTAGE is below 50 V.
When the value is below 50 V, the DC link is regarded as discharged. For
information on reading actual values on the CDP control panel, see “10.3.2
Actual signals mode” on page 130.
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4. Check the GROUNDING SWITCH UNLOCKED lamp and the
wiring of the lamp.
a) Check if the CDP control panel displays a fault.
A fault prevents the lamp GROUNDING SWITCH UNLOCKED from lighting.
- If a fault is present, follow the instructions in “11.3.4 Standard
troubleshooting procedure” on page 155, before you reset a fault.
- If a fault cannot be rectified and reset, contact the ABB
service organization.
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