Tweco 6000GST Cutting Systems - Manual (Page 47)

Manual 0-2690 A-1 APPENDIX
APPENDIX 1: SEQUENCE OF OPERATION BLOCK
DIAGRAM
A-01815
ACTION
Close external
disconnect switch
RESULT
• Power to system
ACTION
Enable ON at Remote
or TB2
ON/OFF switch to ON
RESULT
• AC indicator ON
• TEMP indicator ON
• GAS indicator ON
• Fan and Pump ON
• 40 sec auto-purge
ACTION
Gas Control Module
MODE switch to SET
RESULT
• Gas solenoids open,
gases flow to set
pressures and flows
• GAS indicator ON
ACTION
Gas Control Module
MODE switch to RUN
RESULT
• Gas flow stops
• GAS indicator OFF
• Power circuit ready
ACTION
Proctect eyes and
activate torch
RESULT
• GAS indicator ON
• Gas pre-flow
• Main contactor
closure
• DC indicator ON
• Pilot contactor
closes
• PILOT indicator ON
• Pilot arc established
PILOT ARC
ACTION
Torch removed from
work
RESULT
• Main arc stops
• Pilot arc auto-restart
if enabled
• PILOT indicator ON
ACTION
Torch moved to
within
1/8 - 3/8 inch of
work
RESULT
• Main arc transfer
• PILOT indicator OFF
• Pilot arc off
ACTION
Open external
disconnect
RESULT
• No power to system
ACTION
ON/OFF switch
to OFF
RESULT
• AC indicator OFF
• TEMP indicator OFF
• Fan and Pump OFF
ACTION
Torch de-activated (by torch switch
release or by remote device)
RESULT
• Main arc stops
• Main contactor opens
• DC indicator OFF
• Pilot and PILOT indicator OFF
NOTE - If torch is activated during post-flow
the pilot arc will immediately restart. If within
range of the work, main arc will transfer.
After post-flow:
• Gas solenoids close, gas flow stops
• GAS indicator OFF