Lincoln Electric IM939 RED-D-ARC LN-25 PRO EXTREME - Manual (Page 29)

D-1 MAINTENANCE D-1
LN-25 PRO EXTREME
ELECTRIC SHOCK can kill.
• Do not operate with covers
removed.
• Turn off power source before
installing or servicing.
• Do not touch electrically hot
parts.
• Turn the input power to the welding power
source off at the fuse box before working in the
terminal strip.
• Only qualified personnel should install, use or
service this equipment.
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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.
CALIBRATION SPECIFICATION
The voltmeter and flow meter are not calibrated and
are for reference purposes only.
Voltmeter Validation, Across the Arc Analog Meter
Models
Tools required:
• DC voltmeter reference standard
• Constant voltage DC welding power source with
adjustable no-load voltage (DC-400, V-350, CV-400
or equivalent).
To verify the analog voltmeter accuracy:
1. Turn power OFF.
2. Connect the LN25 PRO EXTREME to the constant
voltage DC welding power source. The work lead
of the LN25 PRO EXTREME must be connected to
the work terminal of the power source.
3. Connect the reference voltmeter between the
brass block of the LN25 PRO EXTREME and the
work lead.
4. Turn power ON.
5. Energize the output circuit of the power source.
Adjust the power source output to 20±1 VDC as
measured on the reference meter.
6. Verify that LN25 PRO EXTREME voltmeter reads
between 19 and 21 volts.
If the voltmeter reading is out of range, check for
loose connections or replace the voltmeter. There is
no calibration adjustment for the LN25 PRO
EXTREME voltmeter.