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A-5
CONNECTION OF DC-400 TO LN-22 OR LN-25
a) Turn off all power.
b) Place output terminals switch into the "ON" posi-
tion.
c) Connect the electrode cable to the output terminal
of polarity required by electrode. Connect the work
lead to the other terminal.
d) Place the OUTPUT CONTROL Switch at "LOCAL"
position unless a Remote Control is connected to
the DC-400.
e) Place MODE SWITCH in "CONSTANT VOLTAGE
(FCAW, GMAW)".
NOTE: The output terminals are energized at all
times.
MULTIPROCESS SWITCH CONNECTION AND
OPERATION
PURPOSE
A Multiprocess Switch has been designed for use with
the DC-400 or DC-600. With this switch installed on
the DC-400, it permits easy changing of the polarity of
the wire feed unit connected and also provides sepa-
rate terminals for connection of stick or air carbon arc.
The Multiprocess Switch is available as either a facto-
ry installed or field installed option.
NOTE: IF THE DC-400 IS TO BE USED FOR BOTH
SEMIAUTOMATIC/AUTOMATIC AND STICK
/AIR CARBON ARC, THEN A MULTI-
PROCESS SWITCH IS REQUIRED.
DESIGN
The Multiprocess Switch consists of a 3-position
switch assembly that is mounted in a sheet metal
enclosure that has two output terminals on each end
of the box. The two terminals on the left side of the
box are for connection of wire feed electrode and work
leads. The two terminals on the right side of the box
are for connection of work and electrode for stick or
air carbon arc. The output terminals are protected
against accidental contact by hinged covers.
The switch mounts to the front of the DC-400 by
means of a bracket that fastens to the case sides.
Two 4/0 (107 mm
2
) leads connect the switch assem-
bly to each output stud.
INSTALLATION
1. Connect wire feed unit electrode and work cables
through the rectangular strain relief holes in the
base of the DC-400 to the output studs on the left
side of the box.
2. Connect wire feeder control cable and make other
terminal strip connections as specified on the con-
nection diagram for the Lincoln wire feeder being
used. "Electrode" and "Work" are connected to the
left side of the Multiprocess Switch.
3. Connect stick or air carbon arc electrode and work
cables through the rectangular strain relief holes in
the base of the DC-400 to the output studs on the
right side of the box.
OPERATION
The operation of the switch is as follows:
A semiautomatic or automatic wire feed unit electrode
and work cables are connected to the terminals on the
left side of the box. Stick or air carbon arc electrode
and work leads are connected to the terminals on the
right side of the box. There are three positions on the
switch. With the switch in the left position, the wire
feed terminals are electrode negative. In the center
position, the wire feeder terminals are electrode posi-
tive. In both the left and center switch position, the
right side stick terminals are disconnected. In the
right switch position, the wire feed terminals are dis-
connected from the DC-400 and the stick terminals
connected. The polarity of the stick terminals is
marked on the end of the box. To change polarity, the
electrode and work leads must be interchanged. In
the stick position, the stick terminals are energized at
all times.
CONNECTIONS
(For those applications where it is not necessary to
have separate work cables for stick and semiautomat-
ic welding.)
If both stick and semiautomatic welding is done on the
same workpiece, only one work lead is required. To
do this, connect a 4/0 (107 mm
work terminal on the semiautomatic side to the termi-
nal to be used for work on the stick side. The work
lead from the semiautomatic side then serves as the
work lead for both semiautomatic and stick welding.
DC-400
A-5
2
) jumper from the
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