Routine Maintenance

D-2		MAINTENANCE	D-2

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WARNING

ELECTRIC SHOCK can kill.

•Have an electrician install and service this equipment.

•Turn the input power off at the fuse box before working on equipment.

•Do not touch electrically hot parts.

•Prior to Performing preventative main- tenance, perform the following capaci- tor discharge procedure to avoid elec- tric shock.

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PERIODIC MAINTENANCE

WARNING

ELECTRIC SHOCK CAN KILL.

•Turn off machine at the disconnect switch on the front of the machine before tightening, cleaning or replacing

consumables.

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Change consumables as required.

THERMAL PROTECTION

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1.Keep the cutting or gouging area and the area around the machine clean and free of combustible materials. No debris should be allowed to collect which could obstruct air flow to the machine.

2.Every 6 months or so, the machine should be cleaned with a low pressure airstream. Keeping the machine clean will result in cooler operation and higher reliability. Be sure to clean these areas:

-Printed circuit boards and heat sinks

-Power switch

CAUTION

•When using a low pressure aistream, wear appropiate eye protection.

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3.Examine the sheet metal case for dents or break- age. Repair the case as required. Keep the case in good condition to insure that high voltage parts are protected and correct spacings are maintained. All external sheet metal screws must be in place to insure case strength and electrical ground continu- ity.

4.Inspect the cable periodically for any slits or punc- ture marks in the cable jacket. Replace if neces- sary. Check to make sure that nothing is crushing the cable and blocking the flow of air through the air tube inside. Also, check for kinks in the cable peri- odically and relieve any so as not to restrict the flow of air to the torch.

Thermal Detection Devices protect the machine from excessive operating temperatures. Excessive temper- atures may be caused by a lack of cooling air or oper- ating the machine beyond the duty cycle and output rating. If excessive operating temperatures should occur, the yellow thermal LED will light and the Detection Devices will prevent output voltage or cur- rent.

These Detection Devices are self-resetting once the machine cools sufficiently. If the thermostat shutdown was caused by excessive output or duty cycle and the fan is operating normally, the Power Switch may be left on and the reset should occur within a 15 minute peri- od. If the fan is not turning or the air intake louvers were obstructed, then the power must be switched off and the fan problem or air obstruction must be correct- ed.

A protection circuit is included to monitor the voltage across filter capacitors. In the event that the capacitor voltage is too high, the protection circuit will prevent output.

REPLACEMENT OF INTERNAL FUSES

The PRO-CUT 25 has additional protection provided to some circuits through internal fuses. For replacement of those fuses proceed as follows:

1.Turn off the power to the unit and remove the input plug.

2.Allow the machine to stand for 5 minutes to let the input capacitors discharge.

3.Remove the machine cover.

4.Replace the blown fuse with a new 0.5A 500V slowblow fuse or 32A 400V fuse as appropriate.

NOTE: If the fuse blows again after power is restored, the cause could be an internal breakdown in the power unit. In this case, take the unit to an authorized Lincoln Field Service Shop.