Manual 0-2859 4-3 OPERATION
H. Set Operating Pressure
Place the RUN/SET switch to the SET (down) posi-
tion. Gas will flow. Adjust gas pressure to 70 psi (4.8
bar).
I. Prepare to Cut
Return the RUN/SET switch to RUN (up) position.
Gas will not flow until the Torch is activated.
The system is now ready for operation. Activate the
torch (press torch switch on the handle, send START
signal from CNC or press the torch switch on the Re-
mote Pendant). There is a 2 second pre-flow before
the arc starts.
4.04 Sequence of Operation
The following is a typical sequence of operation for this
power supply. Refer to Appendix 2 for block diagram.
1. Close main power source disconnect switch.
a. AC power is available at the Power Supply.
2. Place RUN/SET switch to RUN (up) position.
3. Place the ON/OFF power switch on the front panel
of the Power Supply to ON (up) position.
a. AC Power Indicator blinks ON and OFF
for eight seconds then stays ON. Fans turn on.
NOTE
Gas comes on if Torch Trigger is pressed (although
unit will not pilot until switch is released and re-
closed after the light stops blinking).
4. Place RUN/SET switch to SET (down) position.
a. Gas solenoid opens and gas flows to set pres-
sure. Set gas pressure to 70 psi (4.8 bar).
b. GAS indicator turns ON.
NOTE
GAS Indicator will not come ON if the gas pres-
sure is set below 35 psi (2.4 bar) at the Gas Pres-
sure Regulator/Filter Assembly.
5. Place RUN/SET switch to RUN (up) position.
a. Gas flow stops. GAS Indicator turns OFF.
6. Protect eyes and activate torch.
a. Gas pre-flow starts (approximately 2 seconds).
GAS Indicator turns ON.
7. After gas pre-flow:
a. Power Supply enabled. DC indicator turns
ON.
8. Pilot arc is established.
9. Move Torch within transfer distance of workpiece.
a. Main arc transfers to work piece. Pilot arc OFF.
10. Complete cutting operation.
NOTES
If the torch is lifted from the workpiece while the
torch switch is activated, the main arc will stop
and the pilot arc will automatically restart.
At output settings over 40 amps, control circuitry
in the power supply automatically reduces output
current to 40 amps if the torch tip contacts the
workpiece.
11. Release or deactivate the torch switch.
a. Main arc stops. Pilot arc stops.
If torch is activated during post-flow, the pilot
arc will immediately restart. If torch is within
1/4 inch (6.4 mm) transfer distance to work-
piece, the main arc will transfer.
12. Gas will flow for 10 seconds (post-flow).
a. Gas flow stops. GAS indicator turns OFF.
13. Place the ON/OFF power switch to OFF (down).
a. AC Power indicator turns OFF. Fans turn
OFF.
14. Place the main power disconnect to open.
a. Main AC power is removed from the system.
For information on cutting techniques, cutting problems,
cutting speeds, cut quality, etc., refer to the torch manual
supplied with the torch.
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