Lincoln Electric IM665 manual GAS Input Connections

A-3 INSTALLATION A-3

securely. WARNING: Failure to wire as instructed may cause personal injury or damage to equipment. To be installed or checked by an electrician or quali- fied 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 nui- sance 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

Many 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.

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 1/4-19 BSPP thread at the rear of the machine. To use the air 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 prefilter be installed in the air supply line ahead of the air connection to the PRO- CUT’s coalescing filter. While the coalescing filter is used to remove small amounts of oil and water aerosol particles from the air supply line, the prefilter can be used to remove larger particulates before they reach the coalescing filter element.This will pro- long the life of the coalescing filter element by up to six times what it would be without the prefilter, and in turn, prolong the life of the PRO-CUT torch and con- sumables as well.

•A standard nominal 5 micron inline prefilter is recom- mended; however, for optimum performance,select a prefilter with a 3 micron absolute rating. If these fil- ter ratings are unavailable, anything with a rating less than, or equal to, 20 micron would be accept- able to use. In line filter elements will generally filter the air with little restriction to the airflow until the ele- ment is about 75 % contaminated. After this point, there will be a noticeable pressure drop in the line.Filter elements should be replaced when a pres- sure drop of 8-10 psi is indicated; however, for opti- mum performance of the PRO-CUT, the filter ele- ment should be replaced at or before the pressure drop reaches 8 psi. Be sure to select a prefilter that will accommodate the necessary flow rating for the PRO-CUT as specified in the Installation section of this instruction manual under the Gas Input Connections heading.

•While it is recommended that an in line prefilter be placed ahead of each PRO-CUT that may be installed in a shared air supply line, one large inline prefilter may instead be used to accommodate sev- eral PRO-CUTs simultaneously. If a shared prefilter is desired, it must be rated to provide the necessary flow rate, as specified, to ensure proper operation of each of the PRO-CUTs sharing a connection.

PRO-CUT 25