Tweco PAK 44G - Manual (Page 27)

Manual 0-2686 21 OPERATION
C. Rear Panel
1. INPUT Cable Bushing (Strain Relief)
A strain relief supplied to secure the customer
supplied primary input power cable to the power
supply. The input AC power cable is routed
through the strain relief and is connected to the
power input terminals inside the unit.
2. PLASMA GAS Connection Fitting
1/4" NPT inert B adapter gas fitting used to sup-
ply the plasma gas to the system.
3. SECONDARY GAS Connection Fitting
1/4" NPT inert B adapter gas fitting used to sup-
ply the secondary gas to the system.
4. Fuse 4FU
Fuse for one line of the Fan Motor. This fuse is
rated at 8 amps.
5. Fuse 5FU
Fuse for one line of the Fan Motor. This fuse is
rated at 8 amps.
6. Fuse 6FU
Fuse for one line of the Fan Motor. This fuse is
rated at 8 amps.
PLASMA
GAS
SECONDARY
GAS WATER SHIELD
INPUT
FAN
ROTATION
4FU
15A
5FU
15A
6FU
15A
HI - FLOW WATER SHIELD ON
OFF
A-02103
6 5 4
1
3
2
Figure 4-3 Rear Panel
4.04 Getting Started
This procedure should be followed at the beginning of
each shift:
WARNING
Check to be sure main disconnect switch is open.
1. Check the torch to be sure that it has the proper
components and is adjusted correctly (refer to Sec-
tion 5.07).
2. Close the main disconnect switch supplying three-
phase power to the unit.
3. Move the ON/OFF switch to ON. The fan and
pump will start. The amber “Ready” light will
come on (if the gas supply is on, the gases will
flow for two seconds).
4. Select plasma gas pressure for type of gouging per
Appendix III. Move the RUN/SET switch to the
SET position. Open the plasma gas supply valve
at the source. Adjust the pressure regulator on the
gas supply until the plasma gas pressure selected
from the table is obtained.
5. Purge for approximately three minutes by letting
the plasma gas run. This will remove any conden-
sation of moisture that may have accumulated in
the torch while it was shut down.
NOTE
Only the plasma gas line needs to be purged.
6. Open the secondary gas supply valve at the source.
Adjust the pressure regulator at the gas supply
until pressure reads 40 psi (2.8 BAR), or turn on
the secondary water if water shield gouging.
7. Return the RUN/SET switch to the RUN position.
8. Set the current adjust knob to the desired amper-
age level.
The system is now ready for operation. The torch is con-
trolled by the switch mounted on the torch handle or the
remote control switch for a machine mounted torch.
NOTE
Refer to Appendix II for detailed block diagram of
the Sequence Of Operation.
4.05 Gouging Operation
A. General Instructions
The suggestions listed below should be followed in all
operations: