MULTI-PROCESS SWITCH (K804-1)
Kit that mounts on the front of the DC-400, and includes
hinged covers over its output studs. The switch has three
positions: Positive semiautomatic/automatic, negative
semiautomatic/automatic and stick/air carbon arc.
Required when using the DC-400 for both semiautomatic/
automatic and stick/air carbon arc.
Install per M17137 instructions included with the field
installed kit.
CAPACITOR DISCHARGE CIRCUIT (K828-1)
Circuit that mounts inside the DC-400.
Recommended when:
1) DC-400 is used in conjunction with any LN-23P or older
LN-8 or LN-9 semiautomatic wire-feeder. Eliminates
possible arc flash re-start of weld when trigger interlock
is used.
Not required with current LN-8 or LN-9’s
manufactured after 12/83, or any LN-9 having an
L6043-1 (or newer) Power PC Board.
2) DC-400 is used with an LN-22 equipped with an older
K279 Contactor-Voltage Control Option. Eliminates
electrode overrun when gun trigger is released. Not
required when later K279 (above Code 8800) is used.
3) DC-400 is used with any semiautomatic wire feeder and
possible small spark, if electrode touches work just after
gun trigger is released, is objectionable.
Install per M17060 instructions included with the Kit.
UNDERCARRIAGES KA1236, KA1237
For easy moving of the machine, optional undercarriages
are available. KA1236 includes wheels and handle to bolt to
DC-400.
KA1237 platform undercarriage includes
mountings for a gas cylinder at rear of welder.
Install per instructions provided with undercarriage.
Installation of Equipment Required
for Recommended Processes
WIRE FEEDER CONTROL CABLE
CONNECTIONS
For control cable with 14-pin connector:
Connect control cable to 14-pin connector on the front
panel of the machine.
See the appropriate connection
diagram for the exact instructions for the wire feeder being
used. Refer to Page 19 for connector pin functions.
For control cable with terminal strip connectors:
The control cable from the wire feeding equipment is
connected to the terminal strips behind the control panel*.
A strain relief box connector is provided for access into the
terminal strip section.
A chassis ground screw is also
provided below the terminal strip marked with the symbol
for connecting the automatic equipment grounding
wire. See the appropriate connection diagram for the exact
instructions for the wire feeder being used.
*
See Terminal Strip Connections Section for access to
the terminal strips.
CONNECTION OF DC-400 TO LN-22 OR LN-25
a) Turn off all power.
b) Place output terminals switch into the “ON” position.
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 energised at all times.
MULTI-PROCESS SWITCH CONNECTION AND
OPERATION
PURPOSE
A Multi-process 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 separate terminals for
connection of stick or air carbon arc. The Multi-process
Switch is available as either a factory 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 Multi-Process 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 95mm
2
leads
connect the switch assembly to each output stud.
CONNECTIONS
1. Connect wire feed unit electrode and work cables
through the elliptical 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
connection diagram for the Lincoln wire feeder being
used. “Electrode” and “Work” are connected to the left
side of the Multi-Process Switch.
3. Connect stick or air carbon arc electrode and work
cables through the elliptical strain relief holes in the
base of the DC-400 to the output studs on the right side
of the box.
Page 16
DC-400
IMA 474
ARC WELDING SUPPLIES - 07 847 7870
