Lincoln Electric IM664 Multi-Weld 350 Arc Converter - Manual (Page 14)

A-7 INSTALLATION
MULTI-WELD 350
A-7
Table .1
Converters Cable Size
on Cable AWG (mm2 )
1 1/0 (50)
2 2/0 (70)
3 3/0 (95)
4 4/0 (120)
5 2x3/0 (2x95)
The output "Electrode" cable should be 2/0 AWG
(70mm
2 ) if sized for rated output up to 200 ft.(61m)
from the Converter. If paralleled, the output cable to
the arc should be 4/0(120mm
2 ).
ELECTRIC SHOCK can kill.
Do not disconnect the Work clip lead
without first switching OFF the
Converter panel switch. Failure to do
so will allow the work lead clip to be
electrically "hot" to work, and "hot" to
the electrode, through the circuit of
the Converter for about 5 seconds until the input
contactor opens.
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CONNECTION FOR NEGATIVE
POLARITY WELDING
(See Figure 2A)
A Multi-Weld 350 may be used for Negative (straight)
polarity CV (Innershield) or CC processes if
connected per the diagram shown below:
No more than one Multi-Weld 350 may be
connected to a power source for Negative Polarity
welding. Multiple units connected to the same
power source may cause damage to the Multi-
Weld 350.
------------------------------------------------------------------------
This connection method will only permit using one
Multi-Weld arc on one power source, and cables have
to be run to the Multi-Weld from both (+) and (-) output
studs of the power source. This is required so that the
(-) electrode has a return path to both the Multi-Weld
and the Power Source, just like the normal (+)polarity
connection has a (-) return path to both the Multi-Weld
(through the Work Clamp) and to the Power Source
(through work connections). Both cable sizes are the
same, with capacity as recommended for normal (+)
connection.
If the power source itself can not perform the CV
negative welding process, the Multi-Weld is basically
serving very well as a process converter (ei; CV from
a CC power source), as well as a remote output
control. The advantage is that the same equipment
(Multi-Welds and CC Power Sources) is used for all
weld process applications.
POWER SOURCE SETUP
Refer to the Instruction Manual provided with the
Multi-Source power source, or other DC power source
being used, for input power supply connections,
output connections and controls setup.
In general:
1. Connect the positive (+) output connection terminal
to the input supplying the Multi-Weld system, and
the negative (-) output connection terminal to the
work. (see Figure 1).
2. If not using a Multi-Source power source;
a If an inductance control, or tap, is selectable,
use lowest inductance.
b. Use CC (Constant Current) mode, for maximum
supply voltage.
c. Set panel output control to maximum, for maxi-
mum current capacity.
d. Activate output with the "output terminals on"
switch, or jumper (2-4 on LE Co terminal strips).
WARNING
- +
W Wor ork
Wor
ork
LN-25 Wire LN-25 Wire
Feeder
Feeder
W Wor ork
MW MW -3 -350 0 (-) (-) Work Lead ad
to
(-) (-) P Pow ower r Sou ourc rce s stu tud
and nd
(-) (-) Electrode Lead lectrode Lead
MW-35 350 0 (+) ) Outpu put Lea Lead
t o o W ork
MUL MULTI-WELD 350 I-WELD 350
Negative Polarity Negative Polarity
DC DC
POWER POWER
SOURCE SOURCE
CAUTION
Figure 2A