Periodic Maintenance; Routine Maintenance - Lincoln Electric PRO-CUT 25 SVM149-A Service Manual

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WARNING
ELECTRIC SHOCK
• 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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ROUTINE MAINTENANCE

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.
MAINTENANCE

PERIODIC MAINTENANCE

can kill.
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Change consumables as required.
THERMAL PROTECTION
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,
PRO-CUT 25
WARNING
ELECTRIC SHOCK CAN KILL.
• Turn off machine at the disconnect
switch on the front of the machine
before tightening, cleaning or replacing
consumables.
the cause could be an internal breakdown in
the power unit. In this case, take the unit to an
authorized Lincoln Field Service Shop.
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