Tweco GC-3000 Gas Control - Manual (Page 23)

Manual 0-2477 19 OPERATION
SECTION 4:
OPERATION
4.01 Introduction
This Section provides a description of the Gas Control
Accessory.
4.02 Functional Overview
The Gas Control Accessory extends the necessary system
gas controls away from the power supply and is as an
accessory with standard machine torch systems. There is
a rear panel connection available at the Gas Control Ac-
cessory for the gas control cable.
4.03 Operating Controls
A. Front Panel
PLASMA SECONDARY
Water Argon/Hydrogen
Air
Nitrogen
Oxygen Nitrogen
Other
Air
GC3000
Gas Control
R
1 2
A-01127
Figure 4-1 Front Panel Operating Controls
1. PLASMA Gas Selection Switch
The switch selects one of four plasma gases for the
operation.
• Air
• Oxygen (O
2
)
• Nitrogen (N2)
• Argon/Hydrogen (ArH2)
2. SECONDARY Gas Selection Switch
The switch selects one of four secondary gases for the
operation.
• Air
• Nitrogen (N2)
• Other
• Water (H
2
O)
B. Rear Panel
The Gas Control rear panel includes a connector for the
Gas Control Interface Cable.
4.04 Sequence Of Operation
1. Connect the required gas supplies (or water for sec-
ondary water) to the correct plasma and secondary
inlets on the Plasma Power Supply. Refer to the Op-
erating Manual supplied with the Plasma Power Sup-
ply being used to make connections.
For the Merlin 3000 the front panel secondary gas se-
lector switch should always be in the GAS position
and the gas selected from the GC 3000 Gas Control.
2. Turn ON the gas supplies.
3. Set the gas bottle regulators, if used, to the proper pres-
sure and check for leaks.
NOTE
While nothing prevents the operator from switch-
ing gases during piloting or cutting it is not rec-
ommended to do so. It may cause pressure or flow
fluctuations that may damage torch parts or the
piece being cut.
4. Select the desired plasma and secondary gases by set-
ting the GC 3000 Gas Control front panel switches to
the desired gas position.
5. Refer to the Operating Manual supplied with the Power
Supply and do the following:
a. Turn ON power to the Power Supply.
b. Set Power Supply pressure regulators to the de-
sired pressures.
c. Purge the system. When switching gases between
operations, allow enough purge time to clear the
old gas from the torch leads.