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B-1
OPERATING INSTRUCTIONS
WARNING
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and
ground.
• Always wear dry insulating gloves.
------------------------------------------------------------------------
FUMES AND GASES can be danger-
ous.
• Keep your head out of fumes.
• Use ventilation or exhaust to remove
fumes from breathing zone.
------------------------------------------------------------------------
WELDING SPARKS can cause fire or
explosion.
• Keep flammable material away.
• Do not weld on closed containers.
------------------------------------------------------------------------
ARC RAYS can burn eyes and skin.
• Wear eye, ear and body
protection.
------------------------------------------------------------
See additional warning information at
front of this operatorʼs manual.
-----------------------------------------------------------
PRODUCT DESCRIPTION
The DC-1000 is an SCR-controlled three phase DC
power source. It is designed with a single range
potentiometer control for submerged arc or open arc
automatic and semiautomatic welding. It can be used
for air carbon arc cutting with carbon rods up to and
including 5/8" (15.9mm) dia. The DC-1000 (below
code 9500) is not recommended for stick welding or
for solid wire and gas in the short arc welding mode.
With the addition of the 500 amp output stud to DC-
1000 models above code 9500, GMAW procedures
can be performed. This connection provides the
enhanced lower current arc characteristics required
for this type of welding.
The DC-1000 is provided with a three position mode
switch that selects CV Innershield®, CV Submerged
Arc or CC (Variable Voltage) Submerged Arc.
The unit is designed to be used with the NA-5, NA-5R
and NA-3 automatics, the LT-56 and LT-7 tractors,
and can also be used with the LN-7, LN-8 or LN-9
semiautomatic wire feeders.
OPERATION
NOTE: All P.C. boards are protected by a moisture
resistant coating. When the welder is operated, this
coating will "bake off" of certain power resistors that
normally operate at high temperatures emitting some
smoke and odor for a short time. These resistors and
the P.C. board beneath them may become blackened.
This is a normal occurrence and does not damage the
component or affect the machine performance.
TO SET POLARITY
Turn off the DC-1000 and connect the electrode cable
to the "Positive" or "Negative" studs depending upon
the electrode polarity desired. Connect the work cable
to the other stud. (See "Output Connections").
Set the "Electrode Negative-Electrode Positive" switch
to correspond to the polarity of the electrode cable
connection. This switch setting is necessary for proper
operation of some Lincoln wire feeders and does not
change the welding polarity.
Starting the Machine - The push button power "on"
switch at the extreme right side of the control panel
energizes and closes the three phase input contactor
from a 115 volt auxiliary transformer. This in turn ener-
gizes the main power transformer.
The red light below the stop-start button indicates
when the input contactor is energized.
Output Control - The output control in the center of
the control panel is a continuous control of the
machine output. The control may be rotated from min.
to max. while under load to adjust the machine output.
The machine is equipped with line voltage compensa-
tion as a standard feature. This will hold the output rel-
atively constant except at maximum output of the
machine, through a fluctuation of +/- 10% of input line
voltage.
Output Control at DC-1000 or Output Control
Remote Switch
The toggle switch on the control panel labeled "Output
Control at DC-1000" / "Output Control Remote" gives
the operator the option of controlling the output at the
machine control panel or at a remote station. For
remote control, the toggle switch is set in the "Output
Control Remote" position and controlled at the wire
feed unit control or by connecting a K775 control to
the appropriate terminals (as indicated on the connec-
tion diagram) on the terminal strip at the front of the
machine. For control at the machine control panel, the
toggle switch is set in the "Output Control at DC-1000"
position.
IDEALARC® DC-1000
B-1
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