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SAFETY PRECAUTIONS
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 operator's manual.
-----------------------------------------------------------
GENERAL DESCRIPTION
The Multi-Source is designed to supply power to the
Multi-Weld welders. It has a wide range three phase
AC input and can be operated on 50 or 60 Hz. The
Multi-Source output peak voltage regulates against
wide changes in output loading and input line voltage
variations to supply a consistently stable voltage high
enough to allow the Multi-Welds to provide good man-
ual electrode capability.
Primary input voltage taps are selected by a single
movable link on the reconnect panel. Main trans-
former auxiliary windings power the firing circuit and
fan motor. The control auxiliary transformer has a sin-
gle, wide range primary and is not reconnectable.
The Fan As Needed feature is activated by an output
current of 20 Adc or a thermostat on the main trans-
former iron.
An independent safety circuit on the Control board
monitors the voltage peaks and opens the input con-
tactor if the limit is exceeded. The green Safe Output
light indicates when the machine output voltage is
within the safe operating range.
OPERATION
Other indicator lights include the amber Thermal light
that signals when the long term output current limit
has been exceeded. This limit is determined by a ther-
mostat sensing the temperature of the negative output
lead from the secondary coils. The white Power light
indicates when the Control board is energized. The
three lights are high intensity LEDs for improved visi-
bility in daylight.
The Output Power display uses high intensity LEDs to
indicate the percentage of full rated output the
machine is supplying.
Two additional thermostats protect the machine in the
case of fan failure or blocked air flow. The SCR heat
sink thermostat responds first to loss of air flow at nor-
mal output loads. This thermostat will disable the
machine output. The transformer iron rear thermostat
senses that the lamination (and thus the coil insula-
tion) is over heating (which can happen even if the
output is disabled). This thermostat will interrupt
power to the Control board causing the input contactor
to open until the iron cools.
The only user controls are an on-off toggle Power
switch that energizes the machine and a 10 A circuit
breaker protecting the fan auxiliary against short cir-
cuits.
DESIGN FEATURES - ALL MODELS
SPECIFICATIONS, DESIGN FEATURES
AND ADVANTAGES
Case parts are predominantly stainless steel, the PC
boards are potted in trays, the controls are sealed, all
machine coils are copper and the whole transformer is
varnish dipped to maximize environmental withstand
capability. The coils are all conservatively rated for
long life.
The Multi-Source output regulates against wide
changes in output loading and input line voltage varia-
tions to supply a consistently stable voltage high
enough to allow the Multi-Welds to provide good man-
ual electrode capability.
MULTI-SOURCE
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