Troubleshooting & repair, Dc exciter test (continued), Warning – Lincoln Electric CLASSIC I SVM134-A User Manual
Page 59
TROUBLESHOOTING & REPAIR
F-15
F-15
CLASSIC I
DC EXCITER TEST
(continued)
EXITER
COVER
WARRANTY
CHECK VOLTAGE
AT BRUSH
HOLDERS HERE
(RIGHT SIDE IS +)
+
FIGURE F.2 – EXCITER COVER REMOVAL
4. Turn off the engine. Using the 3/8” nut driver,
remove the exciter cover. See Figure F.2.
MOVING PARTS can injure.
• Remove guards only when
necessary to perform service,
and replace them when the
service requiring their removal
is complete.
• Keep hands, hair, clothing and tools away
from V-belts, gears, fans, and all other moving
parts when starting, operating, or repairing
equipment.
• If fan guards are missing from a machine,
obtain replacements from a Lincoln
Distributor.
(See Parts List.) Always use
greatest care when working near moving
parts.
5. Start the engine. Using the volt/ohmmeter,
carefully check the DC voltage at the brush
holders.
See Figure F.2.
The right side
brush holder is positive polarity. Normal DC
voltage is 125 - 135VDC with the engine at
the high idle speed of 1600 RPM.
6. If the DC voltage is normal at the brush hold-
ers, the DC exciter armature and shunt coils
are OK.
a. If the voltage is low or not present, pro-
ceed with the shunt coil and series coil
resistance tests.
b. If the correct DC voltage is present at the
brush holders but not at the 120VDC
receptacle, the series coil or associated
leads may be faulty.
See the Wiring
Diagram. Proceed with the shunt coil and
series coil resistance tests.
WARNING