ESAB PCM-875A - Main Arc Difficult to Start

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.