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3-5. Using Multiple Units: Parallel AC Output Connections
Y ELECTRIC SHOCK can kill.
Do not touch live electrical parts.
Turn off welding power sources and disconnect input power before making any weld output con-
nections.
See ANSI Z49.1 and OSHA Title 29, Chapter XVII, Part 1910, Subpart Q (addresses at begin-
ning of manual).
Do not handle or come in contact with two live electrodes at the same time.
Y UNDERSIZED WELD CABLES can cause fire.
Use separate cables from each welding power source. The work or electrode cable from each
welding power source must be able to carry the output of the individual welding power source (see
Section 2-8).
Do not exceed duty cycle of welding power sources.
.
Set Amperage/Voltage Adjustment controls on all paralleled units for the same output.
First Unit
Connections
Y High weld output current hazard! Remove all metal jewelry, such as rings
and watches, and be careful with tools near output terminals. High cur-
rent can cause severe burns from hot metal if touched to output terminals
and unit is On. ALWAYS turn Off welding power sources and disconnect
input power BEFORE making weld output connections.
Y If there are any questions regarding
this procedure, contact the factory be-
fore connecting units.
To
Electrode
To Work
Second Unit (And
Following Units)
Connections
Shielded Cable To
Terminal Strip TE4
(See Section 3-6)
Y Turn Off welding power
source and disconnect input
power before opening ac-
cess door.
Y Always test for correct phas-
ing before paralleling ac out-
puts according to Section
3-9.
To use multiple units in parallel,
make connections as shown.
All units must be set up for ac output
according to Section 2-9. Do not
parallel dc output units with ac out-
put units.
The welding power source outputs
must be synchronized according to
Section 3-6.
.
When connecting two or more
units in parallel, do not use
more than one unit in CV mode.
All units can be operated in CC
mode if a voltage-sensing wire
feed system
constant voltage output is re-
quired, operate only one unit in
the CV mode and put the re-
maining units in the CC mode
To
with their output set to a per-
Electrode
centage of total welding output
divided by the total number of
units used.
Y When using multiple arcs in
parallel, be sure to follow
unit setup instructions care-
fully. Severe damage to units
may occur if units are not
correctly connected for par-
allel operation.
To Next AC Unit
To Work
is
used.
If
ST-801 882-A
OM-2221 Page 23