Product Info
The PRO-CUT 125 is a constant current, single range, continuous control plasma cutting system. The system is one of the most sophisticated on the market. It provides excellent starting characteristics, cutting visibility and arc stability.
Preventive Maintenance Schedule
Routine:
- Keep the cutting or gouging area and the area around the machine clean and free of combustible materials.
- Blow the dust off the air intakes and louvers with compressed air every few months.
- Check the air regulator filters to be sure they do not become clogged. Replace if necessary.
- Inspect the cable periodically for any slits or puncture marks in the cable jacket. Replace if necessary.
- Change consumables as required.
Parts List
- Cutting Torch: The PRO-CUT comes factory equipped with a cutting torch. Cutting torches come with a 25 ft. (7.6 m) or a 50 ft. (15.2 m) cable. (Part Number: Not Available)
- Nozzle: Use the nozzle with the largest orifice size that gives an acceptable cut. This will improve parts life. Never use the 1.1 mm dia. or 1.4 mm dia. nozzles at outputs above the yellow range. (Part Number: Not Available)
- Electrode: The electrode should be finger tight for a snug fit. It should not be torqued any more than 38 inch pounds. DO NOT USE PLIERS TO OVERTIGHTEN THE ELECTRODE. (Part Number: Not Available)
Product Specs Sheet
- Input Frequency: 50 or 60 Hz, 3ø
- Output Rating: 125 Amps, 148 volts, 60% Duty Cycle; 110 Amps, 140 volts, 80% Duty Cycle; 100 Amps, 135 volts, 100% Duty Cycle
- Pilot Current: 26 amps
- Pilot Duty Cycle: 25% (20 seconds out of 80 seconds)
- Current Range: 50-125 Amps
- Maximum OCV@10% High Input: 357
- Normal OCV: 325
- Input Power: 230/460/3/50/60, 220/380/440/3/50/60, 575/3/60
- Idle Current: 4.5 amps @ 220V
- Idle Power: 0.7 kW Maximum
- Power Factor @ Rated Load: 0.60
- Net Weight: 480 lbs/218.2 kg with 25 ft. (7.6 m) Cable, 489 lbs/222.3 kg with 50 ft. (15.2 m) Cable
- Dimensions, H x W x D: 35.6″ x 19″ x 22″ (905mm x 483mm x 559mm) (includes lift bail and undercarriage)
Troubleshooting
- No LED’s light when the power switch is turned on.:
- Check the input power to be sure it is on.
- Check the power line fuses and machine connection.
- Replace line switch.
- The “MACHINE ON” LED is lit, but there is no response when the trigger is pulled.:
- Check the “SAFETY” LED. If it is lit, check the torch consumables and press the “SAFETY RESET” button.
- Check the air supply to the machine. If the air does not flow, the machine will not start.
- Check the operation of the air solenoid by switching the machine to “PURGE”. If the pressure is sufficient, the air should begin to flow and the “AIR PRESSURE” LED should turn on. Return to “RUN” mode. If air does not flow, check the solenoid by applying 115 VAC to its input leads. If it is not bad, replace PC board.
- Low air pressure also results in a “no start” condition. “AIR PRESSURE” LED must be lit when air is flowing.
- 12 seconds, or more, of postflow time has elapsed and a double trigger pull is required to start the pilot arc. The second trigger pull must follow the first within 1 second to start the pilot arc.
- The air begins to flow, the “OUTPUT ON” LED lights for a brief period, but no arc is established.:
- Check the torch consumables to be sure they are in tight, not dirty or greasy, and in good shape. Replace the consumables if necessary.
- Check that CR2 engages.
- Blow off the components in the upper compartment with compressed air.
- Check pilot to 391 for 1.5 ohm resistance.
- Check both 3 ohm 300 watt resistors.
- Replace Control PC board.
- The arc starts but sputters badly.:
- Check the torch consumables to be sure they are tight, not dirty or greasy and in good shape. Replace if necessary.
- Check air supply for oil or a great deal of water. If there is oil or a great deal of water, the air must be filtered or the machine switched to nitrogen or bottled air.
- Check air pressure. It should be set to 60 psi (414 kPa) while air is flowing.
- The “THERMAL” LED is lit. The “MALFUNCTION” LED is blinking.:
- The machine is overheated. Allow it to cool and reset. The air intakes of the machine must not be blocked, or this will become a nuisance. Machine will cool much faster if left on with output off.
- The “MALFUNCTION” LED is blinking two short flashes in close succession followed by a one second off period.:
- The torch connected to the machine is not connected properly or has been damaged. Check all connections and look for sign of damage to the assembly.
- The connected torch is not designed for use with this machine, see Specifications Summary for listing of valid torches for this machine.
- The “MALFUNCTION” LED is lit.:
- The FAULT circuit monitors the torch to see if it is shorted as well as internal machine failures.
- Check the torch consumables to see if they are melted together or are simply touching each other. Tighten, clean or replace. See “Suggestions for Extra Utility from the PRO-CUT System”.
- Check the torch cable to see if it is cut or punctured. Replace.
- Turn off the machine and turn it back on. If the “FAULT” LED will not stay off when you try to cut again and there is no problem with the torch, then something has failed in the machine and the machine should not be left on.
- Check electrode to pilot for short.
- Check the SCR board. Replace if bad.
- Check operation of contactors. Replace if bad.
- Replace Control PC board.
- Alternating “AIR/MALFUNCTION” LED lights:
- Replace Control PC board.
- Air pressure cannot be set to 60 psi (414 kPa) or the machine cuts poorly through thick sections.:
- Watch the pressure gauge during pilot mode. The air pressure should start as 60 psi (414 kPa) and be reduced significantly when the trigger is pulled. If not, then there is a problem with the solenoid assembly.
- The “SAFETY” LED is lit.:
- The machine will not operate. The machine senses that the shield cup is not in place, or the operators could be exposed to dangerous voltages if the machine were allowed to operate.
- Check the shield cup to be sure it is tightly in place.
- Check the torch consumables to see if they are melted together or are simply touching each other. Tighten, clean or replace. See “Suggestions for Extra Utility from the Pro-Cut System”.
- Check the torch cable to see if it is cut or punctured. Replace.
- Check to see that the torch is hooked to the machine properly.
- Push the ‘SAFETY RESET” button, the LED should go out.
- This circuit rarely trips on power up or because of noise. If the circuit can be reset, it is OK to continue operation.
- Replace Control PC board, as this is a safety problem.
- The “OUTPUT ON” and “MALFUNCTION” LED’s blink in alternating order.:
- The pilot arc duty cycle has been exceeded. The machine will cool down and the lights will quit blinking in about 10 seconds. The pilot arc is limited to 20 out of 80 seconds except in special circumstances such as cutting expanded metal.
- Airflow will not shut off.:
- Check harness 1J7 (332) and 3J7 (333) 24VAC auxiliary supply.
- Replace Control PC board.
- No OCV when 2 and 4 are closed.:
- Check CR1.
- 230 VAC across CR1.
- 250V SCR PC board positive/negative
- Check across 31/32 for 110 VAC.
- Replace Control PC board.
Please
note that any procedure, checklist, or other document available on Limble is provided for general education and
information only and does not constitute legal, medical, or financial advice. Limble makes the materials available
AS IS and AS PROVIDED, without warranties of any kind. By downloading or using any such materials, you assume the
risk that they may not be appropriate for your specific situation and agree that you are solely responsible for any
such use, including compliance with applicable law and with meeting any conditions of product warranties. It is
recommended to contact OEM for the most accurate information.
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