Table 6.C
TROUBLESHOOTING SUGGESTIONS FOR THE COMPLETE CONTROLLER (continued)
SYMPTOM
8. Drive motor does
not run with
M
contactor picked
up and SPEED
potentiometer
properly operat-
ing. (continued)
9. Drive motor does
not run with
M
contactor picked
up and SPEED
potentiometer
properly operat-
ing.
(Use this proce-
dure
only if
controller has
optional Test
Meter Adapter
Kit.)
1 0. Remote Operator
Control Station
functions not
operating.
PROBABLE CAUSE
Regulator Module sus-
pected because no out -
put reading at A 1, A2 .
Power Cube suspected
because no output
reading at A 1. A2.
No
gate firing pulses .
Malfunctioning
switches .
RECOMMENDED PROCEDURES
D Test the Regulator Module for fir ing pulses .
D Open the power disconnect swi tch.
D Locate on the Regulator Module a connector near the edge directly above the Maximum Speed
potentiometer . (Refer to Figure 6.4.) This connector has four sets of twi sted red and whi te w ires
going into it.
D Gently I ift the connector off the pins . Move it aside to a position w here it cannot cause shorts or
grounds .
D Connect the leads of the VOM to pins L 1 and G 1. (These pins are identified on the Module.) Refer
to Figur e 6.4 .
D Restore power to controller .
D Place the START / STOP switch in the START position.
D Turn the SPEED potentiometer to 10.
D The reading on the VOM should be \/
2
VAC for proper operation .
D If this reading cannot be obtained , replace the Regulator Module.
D In turn . repeat this same test with pins l2 / G2. 47 / G3. 47/ G4.
D Establish that the Power Cube is receiving pulse in puts at the conn ector on the Regul ator Module .
(Refer to "Regulator Module suspected," Symptom 8.)
D If the Power Cube is receiving pulses yet there is no reading across A 1 and A2 . dete rmin e that the
main contacts on the M contactor are closing .
D In order to check the contacts. replace the drive motor wi th a light bulb on the armat ure wiri ng at
1TB. (On 230 VAC controllers use two light bulbs in series .)
D If the light does not light. replace the Power Cube.
D Turn off power to the controller at the main disconnect .
D Connect a volt-ohmmeter lead to test pin 356 on the Test Meter Module .
D Connect the second lead to test pin 817 .
D Restore power to the controller .
DANGER
THE PROCEDURE DESCRIBED HERE IS PERFORMED WITH LIVE A-C VOLTAGE
APPLIED TO THE CONTROLLER . USE ONLY ONE HAND TO APPLY VOM LEADS /
PROBES. KEEP YOUR OTHER HAND BEHIND YOU AT ALL TIMES . DO NOT HOLD
ONTO THE CONTROLLER FOR SUPPORT . PERSONAL INJURY MAY RESULT IF
THESE PRECAUTIONS ARE NOT TAKEN.
D Place the START / STOP switch in the START position .
D On the + 10
voe scale of the volt-ohmmeter . an increase of approximatel y + 1 VOC should be
noted.
D Turn off
power to the controller .
D Reconnect the volt-ohmmeter to test pins 356 and 816.
D On the + 10
voe scale of the volt-ohmmeter . an increase of approximately +1 VDC should be
noted.
D If voltage readings increase, the Power Cube is receiving puls es to its SCRs.
D
Make a last check of wiring 10 the Power Cube.
D
If wiring is correct, replace the Power Cube.
D Check START / STOP switch, but
first remove a-c line power at main disconnec t.
D Connect ohmmeter to terminal 32 on the Remote Operator Adapter .
D Touch probe to terminal 38 on the Remote Operator Adapter .
D Place switch in the START (closed) position.
D
If the switch is properly functioning , a short will be seen on the meter .
·o Check the STOP function . Place the RUN/ JOG sw itch in the RUN position. Connect the ohmmete r
to terminals 32 and 35 . Place the switch in the STOP posit ion. whic h should open it if it is
functioning correctly . If there isa short. it will be seen on the meter .
If there is no short . the circu it is
opened. and the switch is functioning correct ly.
D Using similar techniques , test the RUN/ JOG sw itch in the RUN posit ion at termin als 32 and 35 .
When the switch is in the RUN position , a short should be read.
42
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