Tweco 1000 Merlin(Dec2004) - Manual (Page 42)

OPERATION 4-6 Manual 0-2708
Select the desired secondary gas as follows:
1. If gas secondary is desired, set secondary mode selec-
tor switch to gas cylinder symbol position.
NOTES
Tap water should only be used for secondary gas
on machine torches.
If tap water pressure is over 100 psi (6.9 bar) there
must be a Water Regulator (Catalog No. 8-6118)
installed between the water source and the Power
Supply.
2. If tap water secondary is desired, set secondary
mode selector switch to water tap symbol posi-
tion and connect tap water to the Power Supply
rear panel at the secondary water connection. It
may take two or three minutes for the water to
start flowing out the front of the torch.
NOTE
Refer to the Torch Instruction Manual for proper
secondary gas selection.
I. Plasma Gas Purge
Move the Power Supply ON/OFF switch to the ON
position.
An automatic gas purge will remove any condensa-
tion that may have accumulated in the torch and leads
while the system was shut down. The gas purge du-
ration is 20 seconds. After the purge is complete, if
the RUN/SET switch is in SET position, gases will
flow. If the switch is in RUN position there will be no
gas flow.
J. Current Output Level Selection
Select the desired current output level from 30-100
amps for the operation.
K. Pressure and Flow Settings
Move the RUN/SET switch to SET position. Set
plasma and secondary pressures. Set the desired gas
pressures and flows at the Gas Control Front Panel
as follows:
1. Select the desired plasma and secondary gases by set-
ting the Gas Control Module front panel switches to
the desired gas positions.
2. To set the Plasma Gas pressure and flow rate do the follow-
ing:
a. Fully open the valve on the top of the Plasma Gas
flowmeter.
b. Pull out the knob on the Plasma Gas regulator.
c. Turn the knob clockwise to increase or counterclock-
wise to decrease gas pressure.
d. Push the knob back in to lock the pressure setting.
e. Slowly close the valve on the top of the Plasma Gas
flowmeter until the desired flow rate is achieved.
3. To set the Secondary Gas pressure do the following:
a. Set the Secondary Mode Selector switch to Sec Pres-
sure position.
b. Pull out the knob on the Secondary Gas regulator.
c. Turn the knob clockwise to increase or counterclock-
wise to decrease gas pressure.
d. Push the knob back in to lock the pressure setting.
4. To set the Lo-Flow Gas flow rate do the following:
a. Set the Secondary Mode selector switch to Lo-Flow
Gas position.
b. Fully open the valve on the top of the Lo-Flow Gas
flowmeter.
c. Pull out the knob on the Secondary Gas regulator.
d. Turn the knob clockwise to increase or counterclock-
wise to decrease gas pressure.
e. Push the knob back in to lock the pressure setting.
f. Slowly close the valve on the top of the Lo-Flow flow-
meter until the desired flow rate is achieved.
5. To set the Water (H
2
O) Mist flow rate do the following:
a. Set the Secondary Mode selector switch to H
2
O Mist
position.
b. Slowly open the valve on the top of the H
2
O Mist
flowmeter until the desired flow rate is achieved.
6. Place the RUN/SET switch to the RUN position.
NOTE
For recommended gas pressures and flows for vari-
ous cutting operations refer to the Instruction
Manual, 0-2710, supplied with the Maximizer 300
Torch.
L. Ready for Operation
Return the RUN/SET switch to RUN position. The
system is now ready for operation.
NOTE
Refer to Appendix 2 for a detailed block diagram of
the Sequence of Operation.