SECTION 6
PCM-875A Plasmarc System
Troubleshooting
6-8
6.2.9 Main arc is difficult to start.
·
The most common reason is worn or missing
consumables. Check and replace if necessary.
·
Input air must be clean and dry.
·
Input air pressure must be between 65 - 75 psig.
·
Torch connections must be tight.
·
Work cable and clamp must be in good condition
and must make a good electrical connection to the
material to be cut.
·
If above items check OK , the problem is internal.
Send unit to an Authorized Repair Station for repair.
·
Missing or weak pilot arc. Check pilot arc fuse,
open circuit voltage, pilot arc resistors and pilot arc
wiring.
·
Inoperative starter board (PCB-5).
·
Check Spark gap in RAS unit. 1mm is desired
gap. If gap is to large, spark will be weak or non-
existent.
