Tweco CE PAK Master 150XL Without Latch Circuit - Manual (Page 36)

OPERATION 4-4 Manual 0-2696
4.03 Sequence of Operation
The following is a typical sequence of operation for this
cutting system. Refer to Appendix 2 for a block diagram.
1. Close main power source disconnect.
a. AC power is available at the Power Supply.
2. Place RUN/SET switch to RUN mode.
3. Place the ON/OFF power switch on the front
panel of the Power Supply to ON.
a. Fan turns ON.
b. Coolant Pump turns ON.
c. AC Power indicator blinks ON and OFF for
eight seconds then stays ON.
d. Start-up pre-purge of gas.
4. Place RUN/SET switch to SET mode.
a. Gas Solenoid opens and gas flows to set pres-
sure.
b. GAS indicator turns ON.
NOTE
GAS indicator will not come ON if the gas pres-
sure is set below 40 psi (2.8 bar) at the Regulator/
Filter Assembly or if coolant flow switch is not sat-
isfied.
5. Place RUN/SET switch to RUN mode.
a. Gas flow stops.
b. GAS indicator turns OFF.
6. Protect eyes and press or activate torch switch.
a. Gas pre-flows starts.
b. GAS indicator turns ON.
7. After gas pre-flow (approximately 2 seconds)
a. Power Supply enabled.
b. DC indicator turns ON.
8. Pilot arc is established.
9. Move Torch within transfer distance of workpiece.
a. Main arc transfer.
b. Pilot arc OFF.
10. Torch is ready to cut. Complete cutting operation.
NOTE
If the torch is lifted from the workpiece while still
having the torch switch activated, the main arc will
stop and the pilot arc will automatically restart.
11. Release or deactivate the torch switch.
a. Main arc stops.
NOTE
If the torch is activated during post-flow, pilot arc
will immediately restart.
If the torch is within 3/8 inch (9.5 mm) transfer
distance of workpiece, main arc will transfer.
12. Gas will flow for 20 seconds (post-flow).
a. Gas solenoid closes.
b. Gas flow stops.
c. GAS indicator turns OFF.
13. Place the ON/OFF power switch on the front
panel of the unit to OFF.
a. AC Power indicator turns OFF.
b. Fans turn OFF.
14. Place the main power disconnect to open.
a. Main AC power is removed from the system.
4.04 Preparations for Operating
Follow this set-up procedure each time the system is op-
erated:
WARNING
Disconnect primary power at the source before dis-
assembling the power supply, torch, or torch leads.
A. Coolant Level Inspection
Check the coolant level at the coolant reservoir at the
rear of the unit. If the coolant is down from the top
of the reservoir more than 2 inches (50 mm), add cool-
ant.
NOTE
The label on the coolant reservoir indicates the level
at which coolant should be added.