Troubleshooting & repair, Input contactor test (continued) – Lincoln Electric IDEALARC R3R-500 User Manual
Page 49
TROUBLESHOOTING & REPAIR
F-15
F-15
IDEALARC R3R
TEST FOR CONTACT CONTINUITY
1. Disconnect the main input supply power to
the R3R machine.
2. Remove the two leads connected to the
input contactor coil, #232A and #233A.
3. Using the external 120VDC supply, apply
120VDC to the terminals of the input con-
tactor coil. If the contactor does NOT acti-
vate, the input contactor is faulty. Replace
the input contactor.
4. With the contactor activated, check the con-
tinuity across the contacts. (Zero ohms or
very low resistance is normal). See Figure
F.4. If the resistance is high, the input con-
tactor is faulty. Replace.
5. When the contactor is NOT activated, the
resistance should be infinite or very high
across the contacts. If the resistance is low,
the input contactor is faulty. Replace the
input contactor.
INPUT CONTACTOR TEST (continued)
FIGURE F.4 – DC COIL INPUT CONTACTOR TEST POINT LOCATIONS
REMOVED)
A
A