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TROUBLESHOOTING & REPAIR
INPUT CONTACTOR TEST (continued)
FIGURE F.2 – INPUT CONTACTOR TEST CONNECTIONS
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TEST FOR CONTACT CONTINUITY
1.Disconnect the main input supply power to the machine.
2.Remove the two leads connected to the input contactor coil, #233 and X1/#232. See Figure F.1 for location.
3.Using the external 120VAC supply, apply 120VAC 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.2. If the resistance is high, the input con- tactor is faulty. Replace the input contactor.
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.
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LINCOLN ®
ELECTRIC
