Reliance electric MinPak Plus, Instruction Manual

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26
TABLE 5.A - TROUBLESHOOTING SUGGESTIONS FOR THE
THREE PHASE MINPAK CONTROLLER (Continued)
Symptom Probable Cause Recommended Procedures
9. Drive motor does
not run with M
contactor picked
up. Potentiometer
properly operatĆ
ing.
Power cubes susĆ
pected because no
output reading at
45Ć47.
Establish that power cube is receiving pulse inputs from digital drive module. (Refer to
above previous test.)
If power cubes are receiving pulses, yet no reading across 45Ć47, determine that the
contacts on M are closing.
Replace drive motor wiring with light bulbs (2 light bulbs for 240 volt, 4 light bulbs for
500 volt armatures, series connection.)
Run drive and look at waveform across light bulbs. (Should be six pulse/16.7 MSEC)
If pulse is missing indicates bad power cube.
Check individual power cubes.
Connect scope across 51 & 47 on terminal strip look to see if SCR is switching if not
replace power cube.
Repeat for 51 & 45, 52 & 47, 52 & 45, 53 8 47 & 53 & 45 if necessary.
10. Remote Operator
Control Station
functions not opĆ
erating.
Malfunctioning
switches.
Check START/STOP switch, but first remove aĆc line power at main disconnect.
Connect ohmmeter to terminal 32 on the Remote Operator Adapter.
Touch probe to terminal 38 on the Remote Operator Adapter,
Place switch in the START (closed) position.
If the switch is properly functioning, a short will be seen on the meter.
Check the STOP function. Place the RUN/JOG switch in the RUN position. Connect
the ohmmeter to terminals 32 and 35. Place the switch in the STOP position, which
should open it if it is functioning correctly. If there is a short, it will be seen on the
meter. If there is no short, the circuit is opened, and the switch is functioning correctly.
Using similar techniques, test the RUN/JOG switch in the RUN position at terminals 32
and 35. When the switch is in the RUN position. a short should be read.
Figure 5.3 - Regulator Module