Chapter 6 – Service and Maintenance
ACS 501 Installation & Start-up Manual 6-11
10. Continue with the following Insulation Test regardless of your
Resistance Test results.
Insulation Test
1. Follow Resistance Test Steps 1 – 5, above.
2. Connect the insulation tester positive test probe to the capacitor positive
terminal, and the negative test probe to the negative capacitor terminal.
3. Set the insulation tester to the 500 V DC range.
4. The meter should register a small resistance rising toward infinite
resistance.
5. Continue measuring until the meter reading stabilizes or until the reading
suddenly falls.
6. Repeat Steps 2 – 5 for each capacitor.
7. If a capacitor reading suddenly falls, replace the capacitor. Contact your
ABB service representative.
IGBT Module Tests
The DC Bus Capacitor Tests are divided into groups according to drive
ratings.
ACS 501 – 002, 003,
and 005
1. Disconnect and lock out power from the ACS 501.
WARNING! Wait at least five minutes after disconnecting power from the
drive before you attempt to service the drive. Bus capacitors in the
intermediate circuit must discharge before servicing the drive. Check for zero
volts at Terminals X50:21 – 29 and X2:(+) and (-) before servicing the drive.
Failure to check voltage may result in death or serious injury.
2. Check for zero volts at Terminals X50:21 – 29 and X2:(+) and (-) before
continuing.
CAUTION: Electrostatic Discharge (ESD) can damage electronic circuits.
Do not handle any components without following the proper ESD
precautions.
Note: When disconnecting wires from components and terminals, mark the
wires to correspond to their component and terminal connections.
3. Remove all control wiring from the Control Interface Card.
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