Tweco PakMaster 75XL Plus (CE) User Manual

Page 32

OPERATION

4-4

Manual 0-2782

Place RUN/SET/LATCH switch to SET mode.

a. Gas solenoid opens and gas flows to set pres-

sure.

b. GAS indicator turns ON.

NOTE

Minimum pressure for power supply operation may
be lower than minimum for torch operation.

NOTE

GAS indicator will not come ON if the gas pres-
sure is set below 35 psi (2.4 bar) at the Regulator/
Filter Assembly.

Place RUN/SET/LATCH switch to RUN mode.

a. Gas flow stops.

b. GAS indicator turns OFF.

Protect eyes and press or activate torch switch

a. Gas pre-flows starts.

b. GAS indicator turns ON.

After gas pre-flow (approximately 2 seconds)

a. Power supply enabled.

b. DC indicator turns ON.

c. Pilot relay closes.

Pilot arc is established

Move Torch within transfer distance of workpiece.

a. Main arc transfer.

b. Pilot arc OFF.

10. Optional - Place RUN/SET/LATCH to LATCH

mode.

NOTE

For general cutting, use the RUN position which
provides normal touch operation where the torch
switch must be held throughout the main arc trans-
fer.

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.

11. Complete cutting operation.

NOTE

If the torch is lifted from the workpiece, while still
having torch switch activated, the main arc will
stop and the pilot arc will automatically restart.

12. Release or deactivate the torch switch.

a. Main arc stops.

b. Pilot arc stops (power supply enable signal re-

moved).

NOTE

If torch is activated during post-flow, pilot arc will
immediately restart.

If torch is within 3/8 in (9.5mm) transfer distance
of workpiece, main arc will transfer.

13. Gas will flow for 15 seconds (post-flow).

a. Gas solenoid closes

b. Gas flow stops.

c. GAS indicator turns OFF.

14. 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.

15. Place the main power disconnect to open.

a. Main AC power is removed from the system.