Lincoln Electric PERKINS SA-250 - Manual (Page 20)

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TROUBLE
D. Welding current too great or
too small compared to indica-
tion on the dial.
E. Arc continuously pops out.
CAUSE
1. Exciter output low causing low
output compared to dial indica-
tion.
2. Operating speed too low or high.
1. “Current Range Selector” switch
may be set at an intermediate
position.
WHAT TO DO
1. Check exciter field circuit.
2. Adjust speed screw on governor
for 1800 RPM operating speed.
1. Set the switch at the center of
the current range desired.
TROUBLESHOOTING (Continued)
(1) FLASHING THE FIELDS
AC Auxiliary Power:
1. Stop the engine welder and remove the cover from the exciter.
2. Turn the “Fine Adjustment Control” (rheostat) to “100” on the dial.
3. Using a 12 volt automotive battery, connect its negative terminal to the negative brushholder. The negative
brushholder is the one nearest to the rotor lamination. See the wiring diagram. With the engine NOT running,
touch the positive battery terminal to the positive brushholder. Remove the battery from the circuit.
4. Replace the exciter cover. Start the welder and the generator voltage should build up.