Lincoln Electric X-TRACTOR 3A Service Manual page 28

X-TRACTOR ® 3A
M1 THREE-PHASE FAN RESISTANCE TEST
PROCEDURE
1. Remove input power to the X-Tractor 3A.
2. Perform the Case Cover Removal Procedure.
3. Locate the M1 three-phase fan inside the machine. See Figure
F.5.
4. Using a phillips screwdriver, label and remove the three M1 fan
leads from the K1 contactor. The M1 fan leads are connected to
terminals 2T1, 4T2 and 6T3 on the K1 contactor. See Figure F.6.
See the Wiring Diagram.
5. Using the ohmmeter, check the resistances between the three
input leads to the M1 fan. Normal resistance between phases
should be approximately 4.5 ohms. This value may be different
if testing the fan in an 230 Volt X-Tractor 3A machine.
6. Also check the resistance between the three input leads and
ground. Normal resistance should be at least 500,000 ohms to
ground.
7. Connect all previously removed leads.
8. Perform the Case Cover Replacement Procedure.
Figure F.5 – M1 three-phase fan location
M1 FAN
F-14
TROUBLESHOOTING AND REPAIR