Lincoln Electric IM10076 LN-25 PRO - Manual (Page 32)

ELECTRIC ShOCK can kill.
• Turn the input power OFF at the
welding power source before
installation or changing drive
rolls and/or guides.
• Do not touch electrically live
parts.
• When inching with the gun trigger, electrode
and drive mechanism are "hot" to work and
ground and could remain energized several sec-
onds after the gun trigger is released.
• Do not operate with covers, panels or guards
removed or open.
• Only qualified personnel should perform mainte-
nance work.
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D-1 MAINTENANCE D-1
LN-25™ PRO
WARNING
SAFETY PRECAuTIONS
ROuTINE MAINTENANCE
• Check weld cables, control cables and gas hoses
for cuts.
• Clean and tighten all weld terminals.
PERIODIC MAINTENANCE
• Clean drive rolls and inner wire guide and replace if
worn.
• Blow out or vacuum the inside of the feeder.
• Inspect the motor brushes every 6 months. Replace
if shorter than 0.5” (12.7mm).
CALIbRATION SPECIFICATION
VOLTMETER VALIDATION
(See Figure D.1)
To verify the analog voltmeter accuracy:
1. Turn power OFF.
2. Connect the LN-25™ PRO to the constant voltage DC
power supply capable of supply at least 4 amps.
Connect the electrode to the “+” positive terminal and
the work clip to the “-“ negative terminal.
3. Connect a reference voltmeter between the brass
block of the LN-25™ PRO and the work lead.
4. Turn power ON.
5. Energize the power supply. Adjust the power source
output to 20.0 VDC as measured on the reference
meter.
6. Verify that LN-25™ PRO voltmeter reads 20 volts.
Adjust the voltmeter as necessary by turning the screw
on the voltmeter.
FIGuRE D.1
Calibration
Screw