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L3 T3
L2 T2
L1 T1
W
(L3)
T3
U
(L1)
V
T2
(L2)
T1
CR 1 Contactor
Coil Terminals
Apply External
120vac Here
272
271
Cover Plate Screws
FIGURE F.13 – INPUT CONTACTOR
INPUT CONTACTOR TEST (continued)
PROCEDURE
VOLTAGE TEST
1. Disconnect the input power and remove the Input
Access Panel from the rear of the machine
2. Connect an AC voltmeter to the two coil terminals
of the Contactor See Figure F.13.
3. Apply the 3 phase power to the DC-600 and turn
the Power Switch ON.
ELECTRIC SHOCK can kill.
• Do not touch electrically hot parts.
4. If the meter shows 120vac and the Contactor does
not operate, it is defective.
5. If the 120VAC is not present at the coil:
• Check the Power Switch, Thermostats and asso-
ciated wiring. See the Wiring Diagram.
• Also check the Control Board LEDs to be certain
that the machine is not in a “shut down” condition.
See the PC Board Troubleshooting Guide.
• Check the CR 2 relay for proper operation.
CONTACT TEST
1. Disconnect the input power and remove leads 271
and 272 from the CR1 coil terminals. See Figure
F.13.
2. Remove the contactor cover plate, blow out any
dust or dirt with low pressure air.
3. Examine the contacts for signs of arcing, sticking or
pitting. If any of these conditions exist, the
Contactor should be replaced.
4. With the cover back in place, apply an external
120VAC supply to the coil terminals and make sure
the Contactor activates and is not ‘noisy’. A noisy
contactor should be cleaned or replaced.
NOTE: A noisy or shorted contactor can damage the
Control Transformer.
5. With an ohmmeter, check across each set of con-
tacts for continuity (0 ⏐ ’s). See Figure F.13.
L1 t0 T1
L2 to T2
L3 to T3
If there is any resistance, replace the contactor.
6. Remove the 120VAC supply and re-check the con-
tacts for an open condition. If any resistance is
measured, replace the contactor.
TROUBLESHOOTING AND REPAIR
F-28 F-28
DC-600
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WARNING