Lincoln Electric POWER WAVE SVM173-A - Manual (Page 66)

TROUBLESHOOTING & REPAIR
F-20 F-20
POWER WAVE 455M/MSTT Retur
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INPUT
CONTACTOR
601
X4
FIGURE F.5 – INPUT CONTACTOR COIL
INPUT CONTACTOR TEST (CONTINUED)
TEST PROCEDURE
1. Remove input power to the Power Wave
455.
2. Using the 3/8” nut driver, remove the input
access panel and case top.
3. Locate, mark, and remove the two leads
(601, X4) that are connected to the input
contactor coil. Refer to Figure F.5.
4. Using the external 24 VAC supply, apply 24
VAC to the terminals of the input contactor
coil. If the contactor does NOT activate, the
input contactor is faulty. Replace.