Pilot Current Lem Test Procedure - Lincoln Electric FlexCut 200 Service Manual

LINCOLN ELECTRIC

PILOT CURRENT LEM 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 Pilot Current LEM is functioning properly.
MATERIALS NEEDED
Load Bank
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 pilot current LEM. See
5. Locate plug J23 on the switch board. See
6. Carefully apply the correct input power to the FlexCut 200 and turn the machine ON.
7. Using a volt/ohmmeter, carefully check for the DC supply voltages to the pilot current LEM per
Table F.20. See
NOTE: Do not attempt to check the voltages at the pilot current LEM
small and delicate and may be damaged if probed with meter leads.
8. If the correct voltages are NOT present at the switch board, perform the
Procedure.
9. Using a load bank, load the machine according to
10. Using a volt/ohmmeter, test the pilot current feedback versus actual output current. See
F.21. See Figure
11. If the DC supply voltages are correct but the feedback voltages are incorrect the pilot current LEM
may be faulty.
12. If faulty, perform the
13. Perform the Case Cover Replacement Procedure.
Figure
Figure F.46. See Wiring Diagram.
F.46. See Wiring Diagram.
Pilot Current LEM Removal And Replacement
F.45.
Figure F.46. See Wiring Diagram.
Table F.21. See Wiring Diagram.
FlexCut® 200 Service Manual
connector. The terminals are
Switch Board Test
Procedure.
Table
66