Choke Test Procedure - Lincoln Electric FlexCut 200 Service Manual

LINCOLN ELECTRIC

CHOKE TEST PROCEDURE

Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized
repairs performed on this equipment may result in danger to the technician or machine operator and will
invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety
notes and precautions detailed throughout this manual. If for any reason you do not understand the test
procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department
for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
TEST DESCRIPTION
This test will determine if the Choke is open or grounded.
MATERIALS NEEDED
Volt/Ohmmeter
Wiring Diagram
TEST PROCEDURE
1. Carefully remove input power from the FlexCut 200 machine.
2. Perform the Case Cover Removal Procedure.
3. Perform the Capacitor Discharge Procedure.
4. Locate the choke assembly. See Figure F.13. See Wiring Diagram.
5. Open: No cutting output. Using a volt/ohmmeter, test the resistance from the snubber board
terminal B4 to the rear of the electrode stud. See Figures F.14 and F.15. See Wiring Diagram.
Typical resistance is less than one ohm.
6. Check for any physical signs of arcing within the choke assembly. See Wiring Diagram.
7. Choke Coil Grounded: Reduced inductance, alternate cutting current path. Electrically isolate the
choke coil by disconnecting the choke lead from snubber board terminal B4 and the choke lead from
the rear of the electrode stud. Using a volt/ohmmeter, check the resistance from choke coil to
chassis ground. Resistance should be at least 500,000 ohms. See Figure F.14. See Wiring Diagram.
8. If any of the tests fail, the choke may be faulty.
9. If faulty, perform the Choke Removal And Replacement Procedure.
10. Connect any previously disconnected leads. See Wiring Diagram.
11. Perform the Case Cover Replacement Procedure.
FlexCut® 200 Service Manual
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