Tweco 1000 Merlin(Sept1999) - Manual (Page 33)

Manual 0-2731 29 OPERATION
4.05 Preparations for Operating
Follow this set-up procedure each time the system is op-
erated:
WARNING
Disconnect primary power at the source before as-
sembling or disassembling power supply, torch
parts, torch and leads assemblies or adding cool-
ant.
A. Coolant Level Inspection
Check the coolant level in the coolant reservoir at the
rear of the unit. If the coolant is down from the top of
the reservoir more than 2 inches (50mm), add cool-
ant.
B. Deionizer Bag Inspection
Check the condition of the deionizer bag in the reser-
voir basket. If the bag is a yellowish brown (straw
color) then replace the bag.
C. Torch Parts Selection
Check the torch for proper assembly. Install proper
torch parts for the application (refer to Maximizer 300
Torch Instruction Manual, Catalog No. 0-2710).
D. Input Power
Check the power source for proper input voltage.
Close main disconnect switch or plug unit in to sup-
ply primary power to the system.
E. Work Cable Connection
Check for a solid and clean work cable connection to
the workpiece. The area must be free from paint and
rust.
F. Torch Connection
Check that the torch is properly connected.
G. Plasma Gas Supply
Connect desired plasma gas. Make sure gas sources
meet requirements (refer to appropriate Torch Instruc-
tion manual). Check connections and turn plasma gas
supply on.
H. Secondary Gas Supply
Connect desired secondary gas. Make sure gas sources
meet requirements (refer to Torch Instruction Manual).
Check connections and turn secondary supplies on.
Select the desired secondary gas per the following:
1. If gas secondary is desired, set secondary mode
selector 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
following:
a. Fully open the valve on the top of the Plasma Gas
flowmeter.
c. Pull out the knob on the Plasma Gas regulator.