ABB ACS6080 User Manual page 197

• Lamp lights up:
- discharging circuit and / or the grounding circuit
are malfunctioning.
3. Verify that the MCB (main circuit breaker) is open.
• If the MCB is open, secure it against closing.
• Check if the LED of digital input IO (input module A1511 in COU1)
is lit.
• If the LED is lit, the feedback signal "MCB is open" is present.
4. Verify that hazardous voltages from the motor cannot be fed into
the drive.
5. Check if the LED of digital output R1 (output module A1511 in COU1)
is lit.
• If the LED is lit, the grounding switch is released.
6. Check the discharging level of the DC link.
• If the value of the parameter 2.01 DC VOLTAGE is below 50 V, the DC
link is discharged.
• If the DC link is discharged, the drive is in "Ready to switch on"
status.
• Check that the message "Ready on" is enabled in the main
status word.
7. Carefully turn the grounding switch to the grounded position on the
following conditions:
• Hazardous voltages cannot be fed into the drive from the main
power supply or the motor
• DC link is discharged
• Grounding switch is released
• Drive status is "Ready to switch on"
IMPORTANT! If you cannot turn the grounding switch, continue with
"9.4.7 Emergency release of a door safety switch" on page 202.
For information on the wiring of the control circuit, see:
• Converter hardware diagram
• Wiring diagram of COU1
For information on the wiring of the discharging circuit and/or the
grounding circuit, see:
• Wiring diagram of COU1
• Wiring diagram of CBU.
3BHS842007 E01 REV C
09 PREVENTIVE AND CORRECTIVE MAINTENANCE
ACS6080 USER MANUAL 197/238