Tweco PC250 - Manual (Page 17)

GENERAL MAINTENANCE
A. Cleaning Power Supply
The only routine maintenance required for the power supply is a thorough cleaning and inspection, with the
frequency depending on the usage and the operating environment.
Disconnect primary power to the system before disassembling the torch, leads, or power supply.
Do not blow air into the power supply during cleaning. Blowing air into the unit can cause metal
particles to interfere with sensitive electrical components and cause damage to the unit.
To clean the unit, open the enclosure and use a vacuum cleaner to remove any accumulated dirt and dust. The unit
should also be wiped clean. If necessary, solvents that are recommended for cleaning electrical apparatus may be used.
When cleaning care must be taken not to move or damage the electronic components.
B. Cleaning Torch
Disconnect primary power to the system before disassembling the torch, leads, or power supply.
DO NOT touch any internal torch parts while the AC indicator light on the front panel of the power supply is ON.
Even if precautions are taken to use only clean air with a torch, eventually the inside of the torch becomes coated with
residue. This buildup can affect the pilot arc initiation and the overall cut quality of the torch. The inside of the torch
should be cleaned with electrical contact cleaner using a cotton swab or soft wet rag. In severe cases, the torch can be
removed from the leads and cleaned more thoroughly by pouring electrical contact cleaner into the torch and blowing
it through with compressed air.
Dry the torch thoroughly before reinstalling.
COMMON OPERATING FAULTS
The following lists the more common cutting faults and what is the possible cause:
1. Insufficient Penetration
a. Cutting speed too fast
b. Torch tilted too much
c. Metal too thick
d. Worn torch parts
e. Cutting current too low
f. Non-Genuine Manufacturer's Parts
2. Main Arc Extinguishes
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. AC line too low - reduce output current
d. Work cable disconnected
e. Worn torch parts
f. Non-Genuine Manufacturer's Parts
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ƽ CAUTION
ƽ CAUTION
ƽ CAUTION
ƽ WARNING
ƽ WARNING