Cable Connections; Shielding Gas Connection; Wire Drive Configuration - Lincoln Electric LN-25 Service Manual

A-4

CABLE CONNECTIONS

There is one circular connector for the gun trigger on
the front of the LN-25™ PIPE.
Function Pin
5-pin trigger A
connector for B
push-guns C
only. D
E
C
D

SHIELDING GAS CONNECTION

WARNING
CYLINDER may explode if damaged.
• Keep cylinder upright and chained
to support.
• Keep cylinder away from areas
where it may be damaged.
• Never lift welder with cylinder attached.
• Never allow welding electrode to touch cylinder.
• Keep cylinder away from welding or other live
electrical circuits.
• Build up of shielding gas may harm
health or kill.
• Shut off shielding gas supply when
not in use.
• See American National Standard Z-49.1, "Safety
in Welding and Cutting" Published by the
American Welding Society.
------------------------------------------------------------------------
Maximum inlet pressure is 100 psi. (6.9 bar.)
Install the shielding gas supply as follows:
1. Secure the cylinder to prevent it from falling.
INSTALLATION
Wiring
5 volt supply
Not used
Trigger
83% WFS switch
5 volt supply
B
E
A
LN-25™ PIPE
2. Remove the cylinder cap. Inspect the cylinder
valves and regulator for damaged threads, dirt,
dust, oil or grease. Remove dust and dirt with a
clean cloth. DO NOT ATTACH THE REGULATOR
IF OIL, GREASE OR DAMAGE IS PRESENT!
Inform your gas supplier of this condition. Oil or
grease in the presence of high pressure oxygen is
explosive.
3. Stand to one side away from the outlet and open
the cylinder valve for an instant. This blows away
any dust or dirt which may have accumulated in the
valve outlet.
4. Attach the flow regulator to the cylinder valve and
tighten the union nut(s) securely with a wrench.
NOTE: if connecting to 100% CO2 cylinder, insert
regulator adapter between regulator and
cylinder valve. If adapter is equipped with a
plastic washer, be sure it is seated for con-
nection to the CO2 cylinder.
5. Attach one end of the inlet hose to the outlet fitting
of the flow regulator. Attach the other end to the
welding system shielding gas inlet. Tighten the
union nuts with a wrench.
6. Before opening the cylinder valve, turn the regula-
tor adjusting knob counterclockwise until the adjust-
ing spring pressure is released.
7. Standing to one side, open the cylinder valve slow-
ly a fraction of a turn. When the cylinder pressure
gage stops moving, open the valve fully.
8. The flow regulator is adjustable. Adjust it to the flow
rate recommended for the procedure and process
being used before making a weld.

WIRE DRIVE CONFIGURATION

(See Figure A.2)
CHANGING THE GUN RECEIVER
BUSHING
WARNING
ELECTRIC SHOCK can kill.
• Turn the input power OFF at the weld-
ing 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 seconds
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.
------------------------------------------------------------------------
A-4