SECTION 5
PCM-875A Plasmarc Cutting System
Maintenance
5-8
CAUTION
The torch requires good electrical contact
between the electrode seat and electrode
holder. If good contact is not maintained,
then the resulting potential difference
causes internal arcing and possible torch
damage.
5.3.4 Damage Caused by Loose Parts and Torch Overheating.
Electrode Insulator (21373)
Arc tracking indicates loose parts. Make sure heat
shield is tightened fully, at least 5mm of rotation
after electrode seat contacts electrode holder.
Check tightness again after a few minutes of use.
Parts damaged by arcing will cause destruction of
torch. Parts damaged by arcing must be replaced.
Deformation at this edge indicates
torch overheating. Check gas
pressure, gas flow rate and current
setting. Deformation leads to loose
parts and internal arcing. Do not
operate torch with a deformed
insulator.
5.3.5 Consumables- Remove and Replace
1. Bring torch to a position where it is easily
accessed by machine operator, in its normal
vertical position and at least 6 inches above the
workpiece or the edge of the water table.
WARNING
!
Make sure that the power source has been
turned off and that the power cable has
been unplugged at the wall receptacle
before proceeding.
2. Unscrew the heat shield and lower it away
from the torch, allowing nozzle and electrode
assembly to remain with shield.
