Shielding Gas Connections - Lincoln Electric LN-25 PRO DUAL POWER Service Manual

A-4
CABLE CONNECTIONS
There is one circular connector for the gun trigger on
the front of the LN-25™ PRO DUAL POWER.
Picture Function
5-pin trigger
connector for
C
B
push-guns
only.
E
D A
CONTROL CABLE CONNECTOR
The control cable connector is present only on the Dual
Power and Control Cable Feeders.
Picture Pin
WIRE FEEDER
A
B
C
J
A
D
K
I B
E
L C
H N
F
G
M
D
G
F
E H
I
J
K
L
M
N
WARNING
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts.
• Welding Voltage is present on pins H,
I, K and N when Dual Power feeders
are operating as Across the Arc feed-
er.
------------------------------------------------------------------------
INSTALLATION
Pin Wiring
A Trigger
B Not used
C Common
D Not used
E Not used
Wiring
Not used
Not used
Output Control to Power Source (2-4)
Output Control to Power Source (2-4)
Remote Voltage Control 77
Remote Voltage Control (wiper) 76
Remote Voltage Control 75
Work Sense Lead 21
42VAC
Not used
42VAC
Not used
Not used
Electrode Sense Lead 67
LN-25™ PRO DUAL POWER
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.
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% CO 2 cylinder, insert reg-
ulator adapter between regulator and cylinder valve.
If adapter is equipped with a plastic washer, be sure
it is seated for connection to the CO 2 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 regulator
adjusting knob counterclockwise until the adjusting
spring pressure is released.
7. Standing to one side, open the cylinder valve slowly
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.
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