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ACCESSORIES
C-3 C-3
LINCOLN
®
ELECTRIC
IDEALARC DC-400
Multiprocess Switch Operation
The operation of the Multiprocess 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 cables are connected to the terminals 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 discon-
nected from the DC-400 and the stick terminals con-
nected. The polarity of the stick terminals is marked
on the end of the box. To change polarity, the elec-
trode and work cables 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 cable is required. To
do this, connect a 4/0 (107 mm
2
) jumper from the work
terminal on the semiautomatic side to the terminal to
be used for work on the stick side. The work cable
from the semiautomatic side then serves as the work
cable for both semiautomatic and stick welding. See
Figure C.2.
To change stick polarity, reverse the leads at the (+)
and (-) terminals on the right side of the Multiprocess
Switch.
NOTE: When a DC-400 equipped with Multiprocess
Switch is mounted on an undercarriage, the
undercarriage handle in the resting position
can hit the case of the Multiprocess Switch.
This does no harm, but if the user desires, a
1/4” or 3/8” bolt and nut may be placed in the
hole in the undercarriage tow bar to limit the
travel of the undercarriage handle.
FIGURE C.2 – SINGLE WORK CABLE WITH JUMPER
To stick electrode holder or
air carbon arc torch
User supplied 4/0 (107 mm
2
)
jumper
To semi-auto or auto equipment