Tweco Merlin 6000GST Master PS - Manual (Page 18)

INTRODUCTION & DESCRIPTION 2-4 Manual 0-2652
E. RF Shielding
All machine torch systems are shielded to minimize radio fre-
quency (RF) interference which results from the high frequency
arc initiation. These shielded systems are designed with fea-
tures such as a wire for establishing an earth ground and shielded
torch and control leads.
F. Interlocks
The system has several built-in interlocks to provide safe and
efficient operation. When an interlock shuts down the system,
the fault condition must be remedied and the system recycled
using the applicable control device.
1. Parts-In-Place (PIP) Interlock
The Power Supply has a built-in parts-in-place interlock
that prevents accidental torch starting when torch parts
are not properly installed. A flow switch on the coolant
return lead detects reduced coolant flow caused by im-
proper torch assembly. If not satisfied, the switch inter-
rupts power to the tip and electrode.
2. Gas Pressure Interlock
A pressure switch, located in the Arc Starter Box, acts as
an interlock for the plasma gas supply. If the supply pres-
sure falls below minimum requirements the pressure switch
will open, shutting off the power to the contactors, and the
GAS indicator will go out. When adequate plasma supply
pressure is available the pressure switch will close, allow-
ing power to be resumed for cutting.
NOTE
There is no gas pressure interlock for secondary
gas.
3. Thermal Interlock
Thermal overload sensors are located in the trans-
former, pilot resistors, and main heatsink in the power
supply. If one of these components is overheated the
appropriate switch will open, causing the tempera-
ture light to turn from green to red and shutting off
power to the main contactor. When the overheated
component cools down the switch will close again
and allow operation of the system.
G. Plasma Torches
Plasma torches are similar in design to the common au-
tomotive spark plug. They consist of negative and posi-
tive sections which are separated by a center insulator.
Inside the torch, the pilot arc is initiated in the gap be-
tween the negatively charged electrode and the positively
charged tip. Once the pilot arc has ionized the plasma
gas, the superheated column of gas flows through the small
orifice in the torch tip, which is focused on the metal to be cut.
The Maximizer 300 Torch uses an internal closed-loop cooling
system. Deionized coolant is distributed from a reservoir in the
Power Supply through the coolant supply lead. At the torch,
the coolant is circulated through the torch tip and electrode,
where the extra cooling helps to prolong parts life. Coolant
then circles back to the power supply through the return lead.
2.05 Options And Accessories
These items can be used to customize a standard system for a
particular application or to further enhance performance. Torch
accessories are listed in the separate Torch Instruction Manual.
NOTE
Refer to Section 6, Parts Lists, for ordering infor-
mation.
A. RC6010 Remote Control
For mechanized systems, this low profile unit pro-
vides full CNC interface capability and allows the
operator to control most system functions from a re-
mote location.
B. SC-10 Standoff Controls
For machine torch systems, the Standoff Control auto-
matically finds height and maintains torch standoff
with a high speed torch lifter motor.
NOTES
Standoff Control SC10 must be used with the Re-
mote Control RC6010.
C. Computer Control Cable Kits
For interfacing the power supply with a computer or
auxiliary control device. Available in various cable
lengths.
D. High Pressure Regulators
Available for air, oxygen, argon/hydrogen, nitrogen,
CO
2
, and water.
E. High Flow Water Shield (HFWS) Assembly
Reduces arc glare, noise, and fumes during the cut-
ting process.