Lincoln Electric WELDANPOWER SVM 113-A Service Manual page 52

F-14
FIGURE F.1 - LOCATION OF LEAD 202 FOR ROTOR VOLTAGE TEST
(TOP TERMINAL,
TEST PROCEDURE
1. With the 5/16" nut driver, remove the 8
sheet metal screws that hold the top cover
to the control box. Remove the top cover.
2. Start the machine and run it at high idle.
Set the output control (rheostat) at the
MAXIMUM setting.
3. Set the volt/ohmmeter at the DC position.
4. Place the positive probe on lead #202 (two
red wires joined together) where it con-
nects at the back of the rheostat.
Figure F.1 for location. Place the negative
probe on the machine ground stud or any
other good, unpainted ground.
TROUBLESHOOTING & REPAIR
ROTOR VOLTAGE TEST (continued)
LEAD 202
CONNECTION
CASE FRONT
IN PLACE
WELDANPOWER 125
GROUND STUD
5. Check the voltage reading on the volt/ohm-
meter. It should read 40 - 47 VDC.
6. If the voltage is low or not present, the gen-
erator field circuit is not functioning cor-
rectly. Proceed with the Rotor Resistance
Test. C1, R1, or D1 may also be faulty.
7. If rotor voltage is correct, the generator
field is okay. Replace the top cover on the
control box.
screws with the 5/16" nut driver.
See
F-14
Tighten the 8 sheet metal