Tweco 38 CutMaster - Manual (Page 47)

Manual 0-2964 A-1 APPENDIX
APPENDIX 1: SEQUENCE OF OPERATION
(BLOCK DIAGRAM)
ACTION
ON / OFF switch
to OFF
RESULT
All indicators off.
Power supply fan shuts off.
ACTION
RUN / SET switch
to RUN.
RESULT
Gas flow stops.
ACTION
Torch moved within
transfer distance of workpiece.
RESULT
Main arc transfers.
Pilot arc off.
ACTION
Close external
disconnect switch.
RESULT
Power to system.
ACTION
RUN / SET switch to SET.
RESULT
Gas flows to set pressure.
GAS indicator on when input
pressure is adequate.
ACTION
Torch moved away
from work (while
still activated).
RESULT
Main arc stops.
Pilot arc automatically
restarts.
ACTION
ON / OFF switch
to ON.
RESULT
AC indicator ON.
Fan on.
Power circuit ready.
ACTION
Protect eyes and
activate torch.
RESULT
Gas flows briefly,
then stops.
Gas restarts.
DC indicator on.
Pilot arc established.
A-03299
PILOT ARC
ACTION
Unplug input
power cord or
open external
disconnect.
RESULT
No power to system.
ACTION
Release torch trigger.
RESULT
Main arc stops.
Gas flow stops after post - flow.
ACTION
Connect work cable
to workpiece.
Set output amperage
RESULT
System is ready
for operation.