Lincoln Electric POWER WAVE SVM173-A - Manual (Page 67)

TROUBLESHOOTING & REPAIR
F-21 F-21
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FIGURE F.6 – INPUT CONTACTOR TEST POINTS
INPUT CONTACTOR TEST (CONTINUED)
5. With the input contactor activated, check the
continuity across the three sets of contacts.
(Zero ohms or very low resistance is nor-
mal.) Refer to Figure F.6. If the resistance
is high, the input contactor is faulty. Replace
the input contactor.
6. 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.
7. Reconnect the two leads (601, X4) to the
input contactor coil.
8. Install the input access door and case top
using the 3/8” nut driver.
9. Test.