Gas Input Connections - Lincoln Electric PRO-CUT 25 SVM149-A Service Manual

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WARNING
• Failure to wire as instructed may cause personal
injury or damage to equipment.
• To be installed or checked by an electrician or
qualified person only.
------------------------------------------------------------------------
Use of normal 20 amp household breakers may result
in over current trips. If breaker trips occur, reduce the
cutting current output until nuisance trips stop.
To achieve the full 25 amp output capability of the
machine with 115 VAC input, remove the 15 amp or 20
amp plug on the input cord and install a 30 amp or 50
amp plug designed for 115 VAC (NEMA style 5-30P or
5-50P). Follow the instructions included with the plug.
Connect to an appropriate branch circuit with a mating
receptacle.
The PRO-CUT 25 performs best when connected to
230VAC inputs. To change over to 230VAC operation,
install a 230VAC plug with a current rating equal to or
greater than 20 amps.
For use on engine drives, keep in mind the above input
draw restrictions and the following precaution.
The PRO-CUT 25 can be operated on engine driven
generators as long as the 230 volt auxiliary meets the
following conditions:
• The AC waveform peak voltage is below 400 volts*.
• The AC waveform frequency is between 45 and 65
Hz.
• The RMS voltage of the AC waveform is always
greater than 208VAC *.
*
for 115 VAC input divide these values in half
The following Lincoln engine drives meet these condi-
tions when run in the high idle mode:
Ranger 200 & 250 engine drives
Commander 300, 400, & 500 engine drives
Some engine drives do not meet these conditions (eg
Miller Bobcats, etc). Operation of the PRO-CUT 25 is
not recommended on engine drives not conforming to
these conditions. Such combinations may overvoltage
the PRO-CUT 25 power source.
INSTALLATION

GAS INPUT CONNECTIONS

Supply the PRO-CUT 25 with clean compressed air or
nitrogen.
• Supply pressure must be between 80 psi
and 150 psi.
• Flow rate should be approximately 4.0
cfm (113 I/min.).
NOTE: Oil in the air supply to the PRO-CUT 25 can
cause severe problems. Use only a clean air
supply.
• Compressed gas can be supplied either through the air
fitting supplied with the machine or through the
thread at the rear of the machine. To use the air
BSPP
fitting supplied with the machine (packaged in the con-
sumable kit), apply teflon tape to the fitting threads and
install the fitting in the port at the rear of the machine.
• If compressed air is being used, it is highly recom-
mended that an inline filter be installed in the air sup-
ply line ahead of the air connection to the PRO-CUT
25.
• A standard nominal 5 micron inline filter is recom-
mended; however, for optimum performance,select a
prefilter with a 3 micron absolute rating. If these filter
ratings are unavailable, anything with a rating less
than, or equal to, 20 micron would be acceptable to
use. In line filter elements will generally filter the air
with little restriction to the airflow until the element is
about 75% contaminated. After this point, there will
be a noticeable pressure drop in the line. Filter ele-
ments should be replaced when a pressure drop of 8-
10 psi is indicated; however, for optimum perfor-
mance of the PRO-CUT 25, the filter element should
be replaced at or before the pressure drop reaches 8
psi. Be sure to select a filter that will accommodate
the necessary flow rating for the PRO-CUT 25 as
specified in the Installation section of this instruction
manual under the Gas Input Connections heading.
PRO-CUT 25
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