Rockwell Automation Liqui-Flo AC Power Modules - Manual (Page 81)

Troubleshooting the Drive 9-1
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9
Troubleshooting the Drive
This chapter describes how to troubleshoot the drive and the equipment that is
needed to do so. Also provided are replacement part lists and information on clearing
faults.
9.1 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.
9.2 Drive Alarms and Faults
The drive will display alarm and fault codes to assist in troubleshooting when a
problem develops during self-tuning or drive operation.
If an alarm condition occurs, the drive will continue to run and a 2- or 3-digit alarm
code will flash on the display.
If a fault occurs, the drive will coast to rest and a 2- or 3-digit fault code will flash on the
display.
Refer to the LiquiFlo Software Start-Up and Reference manual for more information
on drive alarms and faults.
9.3 Verifying That DC Bus Capacitors Are Discharged
The LiquiFlo drive’s DC bus capacitors retain hazardous voltages after input power
has been disconnected. Perform the following steps before touching any internal
components:
Step 1. Turn off and lock out input power. Wait five minutes.
Step 2. Verify that there is no voltage at the drive’s input power terminals.
!
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.