Tweco PAK Master 150XL - Manual (Page 32)

OPERATION 4-4 Manual 0-2864
3. Place the STANDARD/LATCH switch to STAN-
DARD position.
4. 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 LED blinks ON and OFF
for eight seconds then stays ON.
d. Start-up pre-purge of gas.
5 . 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.
6. Place RUN/SET switch to RUN mode.
a. Gas flow stops.
b. GAS indicator turns OFF.
7. Place the STANDARD/LATCH switch to either
STANDARD or LATCH position as follows:
For general cutting, use the STANDARD position
which provides normal touch operation where the
torch switch must be held throughout the main
arc transfer.
For specific applications, use the LATCH position
where the torch switch can be released after the
main arc transfer. The torch remains activated
until the main arc breaks from the workpiece.
8. Protect eyes and press or activate torch switch.
a. Gas pre-flows starts.
b. GAS indicator turns ON.
9. After gas pre-flow (approximately 2 seconds)
a. Power Supply enabled.
b. DC indicator turns ON.
10. Pilot arc is established.
11. Move Torch within transfer distance of workpiece.
a. Main arc transfer.
b. Pilot arc OFF.
12. Torch is ready to cut. Complete cutting opera-
tion.
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.
13. Release or deactivate the torch switch.
a. Main arc stops.
NOTES
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.
If the STANDARD/LATCH switch is in the
LATCH position the torch remains activated until
the main arc breaks from the workpiece.
14. Gas will flow for 20 seconds (post-flow).
a. Gas solenoid closes.
b. Gas flow stops.
c. GAS indicator turns OFF.
15. 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.
16. 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.