cleaned with a low pressure airstream. Keeping the
machine clean will result in cooler operation and
higher reliability. Be sure to clean these areas (Refer
to Figure D.2):

- Power, Output and Control printed circuit boards

and heat sinks

- Power Switch

- Main Transformer

- Input Rectifier

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. Check the air regulator filter to be sure it does not

become clogged. The air filter on the machine is
self draining and will not have to be emptied.

5. Check the filter element every several months to

see if it is clogged (weekly in very dirty environ-
ments). Replace if necessary by first removing the
two screws that attach the filter cage to the back
panel assembly, then slide the cage away from the
back of the machine and remove. Next, twist the
clear filter bowl until it comes off (be careful not to
lose the o-ring seated at the top of the bowl
threads). Unscrew the filter element and replace
with new element. Assemble parts in reverse order
as described above.

6. 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
periodically and relieve any so as not to restrict the
flow of air to the torch.

PERIODIC MAINTENANCE

ELECTRIC SHOCK can kill.

• Turn off machine at the disconnect

switch on the front of the machine
before tightening, cleaning or replacing
consumables.

Change consumables as required.

1. Thermal Protection

Two thermostats protect the machine from excessive
operating temperatures. Excessive temperatures may
be caused by a lack of cooling air or by operating the
machine beyond the duty cycle and output rating. If
excessive operating temperatures should occur, the
yellow thermal LED will light and the thermostat will
prevent output voltage or current.

Thermostats are self-resetting once the machine cools
sufficiently. If the thermostat shutdown was caused by
excessive output or duty cycle and the fan is operat-
ing normally, the Power Switch may be left on and the
reset should occur within a 15 minute period. If the fan
is not turning or the air intake louvers were obstructed,
then the power must be switched off and the fan prob-
lem or air obstruction must be corrected.

2. Filter Capacitor Conditioning (Pro-Cut 55, 400-460

VAC only)

A protection circuit is included to monitor the voltage
across filter capacitors C1 and C2. In the event that
the capacitor voltage is too high, the protection circuit
will prevent output. The protection circuit may prevent
output providing all these circumstances are met:

a. Machine is connected for 400-460 VAC input.

b. Machine did not have power applied for many

months.

c. Machine will not produce output when power is

first switched on.

If these circumstances apply, the proper action is to
switch the machine on and let it idle for up to 30 min-
utes. This is required to condition the filter capacitors
after an extended storage time. The protection circuit
will automatically reset once the capacitor condition-
ing and resultant voltage levels are acceptable. It may
be necessary to turn the power switch off and back on
again after this period.

WARNING

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