Specifications

CUTMASTER A120
Manual 0-4989 A-1 APPENDIX
APPENDIX 1: SEQUENCE OF OPERATION
(BLOCK DIAGRAM)
ACTION:
ON / OFF switch to ON
RESULT:
AC indicator ON.
GAS indicator ON
when input
pressure is adequate
for power supply operation.
Power circuit ready.
ACTION:
Protect eyes and activate
Torch switch (START)
RESULT:
Fans turn on. Gas flows briefly,
then stops.Gas restarts.
DC indicator ON
Pilot arc established.
ACTION:
Unplug input
power cord or
open external
disconnect.
RESULT:
No power to system.
ACTION:
Connect work cable to workpiece.
Set output amperage.
RESULT:
System is ready
for operation.
ACTION:
RUN /
Rapid Auto Restart /
SET / LATCH switch
to SET
RESULT:
Gas flows to set
pressure.
ACTION:
RUN / Rapid Auto Restart /
SET / LATCH
switch to RUN
(for most applications)
or to
Rapid Auto Restart
(for gouging, trimming,
or expanded metal
applications)
or to
LATCH
is used for specific applications
(torch switch can be released
after main arc transfer).
RESULT: Gas flow stops.
ACTION:
Release Torch switch.
RESULT:
Main arc stops.
Gas flow stops after post - flow.
(Fans will continue to run for
10 minutes after the Torch switch
[START] is removed)
ACTION:
ON / OFF switch
to OFF
RESULT:
All indicators off.
Power supply fans shut off.
ACTION:
Close external
disconnect switch.
RESULT:
Power to system.
ACTION:
Torch moved within
transfer distance of workpiece.
RESULT:
Main arc transfers.
Pilot arc off.
PILOT ARC
ACTION:
Torch moved away from work (while
still activated).
RESULT:
Main arc stops.
Pilot arc automatically
restarts.
Art #A-07979_AB