Rockwell Automation 20M LPM15 Liquid-Cooled Adjustable Frequency AC Drive FRN 2.xxx - Manual (Page 93)

Troubleshooting 4-11
Test Equipment Needed To
Troubleshoot An isolated multimeter will be needed to measure DC bus voltage and to
make resistance checks. Note that dedicated troubleshooting test points are
not provided.
Verifying That DC Bus
Capacitors Are Discharged
The LPM15 drive’s DC bus capacitors retain hazardous voltages after input
power has been disconnected. Perform the following steps before touching
any internal components:
1. Turn off and lock out input power. Wait five minutes.
2. Verify that there is no voltage at the drive’s input power terminals.
3. Measure the DC bus potential with a voltmeter while standing on a
non-conductive surface and wearing insulated gloves (1000 V).
Measure the DC bus potential at the test points on the Power Interface
Control (PIC) board. See
Figure 4.2 for B-Frame drives, Figure 4.3 for
C-Frame drives, and Figure 4.4 for D-Frame drives. For additional
wiring information, refer to Appendix E , Appendix F , or Appendix G .
4. Once the drive has been serviced, reapply input power.
!
ATTENTION: DC bus capacitors retain hazardous voltages
after input power has been disconnected. After disconnecting
input power, wait five (5) minutes for the DC bus capacitors to
discharge and then check the voltage with a voltmeter to ensure
the DC bus capacitors are discharged before touching any
internal components. Failure to observe this precaution could
result in severe bodily injury or loss of life.