Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 260)

260 Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
Appendix C Application Notes
Alpha Test Setup and Operation
1. Remove and lock-out all incoming power to the drive.
2. Disconnect the motor armature leads and mechanically lock the rotor.
3. Attach the isolated oscilloscope leads to the appropriate drive terminals
(based on test to be performed).
4. Reapply power to drive.
5. Verify the no faults or alarms present. If an alarm or fault code displays, see
Chapter 4 - Troubleshooting on page
199 .
ATTENTION: Only qualified electrical personnel familiar with the construction
and operation of this equipment and the hazards involved should perform this
test. Failure to observe this precaution could result in equipment damage and/or
bodily injury.
ATTENTION: This is an open loop test, disconnect the motor armature and field
leads and replace them with dummy loads. Failure to observe this precaution
could result in machine damage and/or bodily injury.
ATTENTION: Uncontrolled machine operation could result with a motor
connected during these tests and may cause personal injury and/or equipment
damage. Verify that the drive is not connected to a motor armature circuit before
enabling these test modes.
ATTENTION: Remove power before making or breaking cable connections.
When you remove or insert a cable connector with power applied, an electrical
arc may occur. An electrical arc can cause personal injury or property damage by:
• sending an erroneous signal to your system’s field devices, causing unintended
machine motion
• causing an explosion in a hazardous environment
Electrical arcing causes excessive wear to contacts on both the module and its
mating connector. Worn contacts may create electrical resistance.
IMPORTANT The Alpha Test requires the use of an isolated oscilloscope and leads that will
be attached to the armature or field terminals of the drive.
L1 L2 L3
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