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Meter Polarity Switch
The wire feeder polarity switch is located at the rear of
the machine. The switch provides a work connection
for wire feeder voltmeters. Place the switch in the
position of the electrode polarity indicated by the
decal. The switch does not change the welding
polarity.
Auxiliary Power
A 24 VAC @ 1 amp supply is included for use with the
LN-25 wire feeder (24 volts needed for K431 and
K432 options). This supply is protected by a self-
resetting current limiter.
A 42 VAC @ 5.5 amp supply is included for use with
other wire feeders. This supply is protected by a 6
amp breaker located on the rear of the machine.
A 110/115 VAC @ 2 amp supply is included for use
with the LN-7 or LN-9 GMA wire feeders. This supply
is protected by a 2.5 amp breaker located on the rear
of the machine. It is NOT available on IEC units.
All three supplies are not to be loaded simultaneously.
MAINTENANCE
WARNING
ELECTRIC SHOCK
can kill.
• Have an electrician install and service
this equipment.
• Turn the input power off at the fuse
box before working on equipment.
• Do not touch electrically hot parts.
---------------------------------------------------------------------
EXPLODING PARTS can cause
injury.
• Failed parts can explode or cause other
parts to explode when power is applied.
• Always wear a face shield and long sleeves when servicing.
----------------------------------------------------------------------------------
Capacitor Discharge Procedure
1. Obtain a power resistor (25 ohms, 25 watts).
2. Hold resistor body with electrically insulated glove.
DO NOT TOUCH TERMINALS. Connect the resis-
tor terminals across the two hex head cap screws
in the position shown. Hold in each position for 1
second. For 575 VAC only, repeat for second
capacitor. Repeat for the capacitor(s) on the other
side of the machine
RESISTOR
CAPACITOR
TERMINALS
3. Use a DC voltmeter to check that voltage is not
present across either capacitor.
Routine Maintenance
1. Every 6 months or so the machine should be
cleaned with a low pressure airstream. Keeping
the machine clean will result in cooler operation
and higher reliability. Be sure to clean these areas:
• Power, switch, driver, protection and control printed
circuit boards.
• Power switch
• Main transformer
• Input rectifier (located in front of fan blade)
• Heat sink fins
2. Examine the sheet metal case for dents or breakage.
Repair the case as required. Keep the case in good con-
dition to insure that high voltage parts are protected and
correct spacings are maintained. All external sheet
metal screws must be in place to insure case strength
and electrical ground continuity.
Page 13
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