Safety Precautions; Power Source Connection; And - Lincoln Electric LN-25 Service Manual

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SAFETY PRECAUTIONS

WARNING
Unless an optional output control or contactor is used
with the LN-25™, the electrode circuit (including
welding wire, wire drive and welding gun) is
electrically hot when the welding power source is on.
The gun trigger controls wire feed only.
Disconnect or shut off welding power source before
making connections or installations to the LN-25™.
Welding gun should be stored in the insulated
gun holder, located near the rear on the top of the
LN-25™ case, to avoid accidental arcing. The LN-
25™ should be positioned upright on a horizontal
surface.
WARNING
ELECTRIC SHOCK can kill.
• Do not touch metal portions
of the LN-25™ lead clip when
welding power source is on.

POWER SOURCE CONNECTION

The LN-25™ can be used with any DC welding power
source. A constant voltage power source is
recommended; however, the LN-25™ can also be
used with a constant current power source as long as
the open circuit voltage is less than 110V DC.
CAUTION
Do not use LN-25™ models below Code 9200 with
any TIG or Square Wave welding power sources. Do
not use LN-25™ models equipped with internal
contactors with non- Lincoln TIG or Square Wave
welding power sources. Damage to the LN-25™
circuit can occur as a result of the high output
inductance typically associated with these power
sources. TIG high frequency power should never be
applied to the LN-25™.
If not using an LN-25™ Remote Output Control option
(See Remote Output Control Options and Cable
Assemblies Section), the power source output must
be electrically "hot" at all times when the power source
is turned on.
See the power source instruction manual for proper
power source connections and setting required.
All manuals and user guides at all-guides.com
INSTALLATION
LN-25™
WARNING
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.
DC-250
™
a. Connect a jumper from 2 to 4 on the power source
terminal strip so the output will be energized when
the DC-250™ is turned on.
b. Connect electrode cable to the "Innershield/
GMAW" output terminal of polarity required by
electrode. Connect
"Innershield/GMAW" output terminal.
c. Place "Set to CV Electrode Cable Polarity" switch
at appropriate position.
d. Place power source toggle switch in "Output
Control at DC-250™" position, unless a Remote
Control is connected to 75, 76 and 77 on the DC-
250™ terminal strip.
e. Place mode switch in "Innershield GMAW (CV)"
position. Set CV arc control to "2" (or "NORMAL"
on some machines). Initially set the output control
on "7".
DC-400 AND CV-400
™
a. Connect a jumper from 2 to 4 on the power
source ter minal strip so the output will be
energized when the power source is turned on.
NOTE: DC-400™ machines above Code 9200 have
an output toggle switch to perform this function.
b. Connect the electrode cable to the output
ter minal of polarity required by electrode.
Connect work lead to other output terminal.
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work lead to other
™