Tweco FP-82 - Manual (Page 25)

Manual 0-2870 4-3 OPERATION
D. Work Cable Connection
Check for a solid work cable connection to the work-
piece.
Make a solid work cable
connection to the work-
piece or cutting table
A-00925
E. Torch Connection
Check that the torch is properly connected.
F. Power On
Place the power supply ON/OFF switch to the ON
(up) position.
G. Select Current Output Level (A)
Set the desired current output level between 20-60
amps for cutting or gouging.
H. Set Operating Pressure
Place the RUN/SET switch to the SET (down) posi-
tion. Gas will flow. Adjust gas pressure control 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 Trigger is pressed.
The system is now ready for operation. Press torch
switch on the handle. 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 to ON (up) posi-
tion.
a. AC Power Indicator blinks ON and OFF
for eight seconds then stays ON; Fans turn on.
NOTE
Gas comes on if Torch is activated (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 flows to set pressure. Gas Pressure Regu-
lator/Filter Assembly should be set 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. DC indicator turns ON.
8. Pilot arc is established.
9. Move Torch within transfer distance of workpiece.
a. Main arc transfers; Pilot arc OFF.