Lincoln Electric IM677 RED-D-ARC LN-25 - Manual (Page 9)

LN-25
A-2 A-2
INSTALLATION
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 on the
terminal strip.
• Only qualified personnel should
install, use or service this
equipment.
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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 work lead to other “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
terminal 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 terminal
of polarity required by electrode. Connect work
lead to other output terminal.
SAFETY PRECAUTIONS
ELECTRIC SHOCK can kill.
• Do not touch metal portions
of the LN-25 lead clip when
welding power source is on.
• 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.
• W e l d i n g g u n s h o u l d b e s t o r e d i n t h e
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.
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POWER SOURCE CONNECTION
The LN-25 can be used with most 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.
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.
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See the power source instruction manual for proper
power source connections and setting required.
WARNING
WARNING
CAUTION