Rockwell Automation FlexPak 3000 Power Module Version 4.2 - Manual (Page 79)

TROUBLESHOOTING/DIAGNOSTICS
49’1340 e FlexPak 3000 7-7
7.7.6 Armature Phase Fire Test
ATTENTION: Only qualified electrical personnel familiar with the construction and operation of this
equipment and the hazards involved should perform this test. Read and understand
this section in its entirety before proceeding.
Failure to observe this precaution could result in severe bodily injury or loss of life.
ATTENTION: This is an open loop test. To prevent excess motor speed and current, lock the motor
shaft or disconnect the motor armature leads from the drive and replace them with a
dummy load (e.g. bulbs in series).
Failure to observe this precaution could result in severe bodily injury or loss of life.
An armature phase fire test mode is available to verify the operation of the S6 or S6R rectifier
bridge. This test should only be performed by qualified personnel. Note that this test is not
available through the
DCM .
To perform an armature phase fire test:
1. Turn off power to the drive. (Lockout and tag power as necessary).
2. Either lock the motor armature to prevent rotation or disconnect the motor armature leads
from the drive and replace with bulbs in series.
When locking the motor armature, the motor field winding can be disconnected to prevent
excessive torque. If the motor field winding is disconnected field current loss faults must be
inhibited by either setting jumper J20 to
DISABLE on FlexPak with field rectifier or setting
Parameter FIELD LOSS THRESHOLD (P.512) to 0 on FlexPak with field current regulator.
3. Turn on power to the drive. The drive must be stopped and the Drive Ready Indicator must
be ON .
4. Set CONTROL SOURCE SELECT to KEYPAD .
5. On the OIM , select Current Minor Loop ( CML ) – SCR Diagnostics – Armature Phase Fire Test.
6. Set PHASE FIRE TST BRIDGE (P.310). This parameter must be set to the appropriate value
before activating the armature phase fire test mode.
7. Attach an oscilloscope to the armature current feedback test point (J17+, J22– on the
Regulator board). Note that the CS3000 software oscilloscope mode does not have
sufficient bandwidth for this test.
8. Press RUN. The armature phase fire test mode is now active. The OIM Running indicator will
be on.
9. Set PHASE FIRE TEST DELTA (P.309) to 55 degrees. Slowly increase PHASE FIRE TEST DELTA
until a steady pattern of “bumps” appears on the oscilloscope. If all thyristors in the selected
bridge are operating, there will be six bumps per AC line cycle. If any bumps are missing,
one or more thyristors are not conducting.
Note that conduction will not begin until the firing angle is sufficiently advanced (
PHASE FIRE
TEST DELTA (P.309) more than 60 degrees). A rate limit block limits the rate of change of
firing angle advances to prevent sudden increases in current. To prevent the drive from
entering continuous conduction during this test,
PHASE FIRE TEST DELTA (P.309) should not
exceed 89 degrees.
10. Press STOP to stop the armature phase fire test.
11. Turn off power to the drive (lockout and tag as necessary).
12. Either unlock the motor armature or remove the bulbs and reconnect the motor armature
leads.
If the motor field winding was disconnected, reconnect it and return jumper J20 to its original
position (typically
ENABLE on FlexPak with field rectifier) or (on FlexPak with field current
regulator) set parameter FIELD LOSS THRESHOLD (P.512) to its original value.