Lincoln Electric X-TRACTOR 3A Service Manual page 44

X-TRACTOR ® 3A
PROCEDURE
1. Remove input power to the X-Tractor 3A.
2. Perform the Case Cover Removal Procedure.
3. Locate the K1 contactor on the DIN rail. See Figure F.15.
4. Using a phillips screwdriver, label and remove the A1 and A2 leads
from the K1 contactor. These are the leads that supply 24VAC to
the K1 contactor coils. See the Wiring Diagram. See Figure F.16.
5. Check the resistance of the coil of K1. Normal resistance is
approximately 5.4 ohms. See the Wiring Diagram. See Figure
F.16.
6. If the resistance is normal, carefully apply the external 24VAC to
the contactor coil of K1. The contactor should activate. If not, the
contactor may be faulty.
7. With 24VAC applied, check the contact resistance between K1
terminals 1L1 and 2T1. It should be zero ohms with the contactor
activated. If not, the contacts may be faulty. See Figure F.16.
See the Wiring Diagram.
8. Check the resistance between K1 terminals 3L2 and 4T2. It
should be zero ohms with the contactor activated. See Figure
F.16. See the Wiring Diagram.
K1 CONTACTOR TESTS
Figure F.15 – K1 contactor location
K1 CONTACTOR
(LOCATED ON DIN RAIL)
F-30
(continued)
9. Check the resistance between K1 terminals 5L3 and 6T3. It
should be zero ohms with the contactor activated. If not, the
contacts may be faulty. See Figure F.16. See the Wiring
Diagram.
10. Check the resistance between terminals 13 and 14. It should be
zero ohms with the contactor activated. If not contactor may be
faulty.
11. Carefully remove the external 24VAC from the K1 contactor coil.
The contactor should deactivate.
12. Recheck the resistances in Steps 7, 8, and 9. The resistances
should now be infinite. If not, the contactor contacts may be
stuck closed.
13. Connect all leads previously removed.
14. Perform the Case Cover Replacement Procedure.
TROUBLESHOOTING AND REPAIR