Thermal Arc ARCMASTER 300 AC/DC, Service Manual

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300ACDC
4
OPERATOR CONTROLS
4 – 2
3. Positive Terminal: Welding current flows from
the Power Source via heavy duty Dinse type
terminal (50 mm). It is essential, however,
that the male plug is inserted and turned
securely to achieve a sound electrical connec-
tion.
4.
Negative Terminal:
Welding current flows
from the Power Source via heavy duty Dinse
type terminal (50 mm). It is essential, how-
ever, that the male plug is inserted and turned
securely to achieve a sound electrical connec-
tion.
CAUTION
Loose welding terminal connections can cause
overheating and result in the male plug being fused
in the bayonet terminal.
5.
Torch / Gas Terminal:
Torch / Gas Terminal
is an all-in-one design of the Gas Outlet and
the Negative Terminal. Gas Outlet is a BSP-3/
8 inch female gas fitting.
6. ON/OFF Switch: This switch connects the Pri-
mary supply voltage to the inverter when in the
ON position. This enables the Power Supply.
WARNING
When the welder is connected to the Primary sup-
ply voltage, the internal electrical components
may
be at
72
0V potential with respect to earth.
7.
Input Cable:
The input cable connects the Pri-
mary supply voltage to the equipment.
8. Gas Inlet: The Gas Inlet is a BSP-3/8 inch
female gas fitting.
2
Weld Process selection for
ARC MASTER 300ACDC
Table 4-2:
Weld Process selection verses Weld Mode
for ARC MASTER 300ACDC
Weld Mode
Weld Process
Selection
STICK
HF
TIG
LIFT
TIG
Description
Yes Yes Yes
2T operation in
TIG Modes using
remote devices to
control contactor
& current
No Yes Yes
4T operation in
TIG Modes with
crater fill using a
remote contactor
device to control
sequence.
No Yes Yes
4T operation in
TIG Modes with
repeat operation
and crater fill
using a remote
contactor device.
No Yes No
2T operation spot
welding in HF TIG
using a remote
contactor device.
No Yes Yes
Pulse operation
in TIG Modes
Yes Yes Yes Selects AC or DC
weld current
Yes No Yes
Contactor
operation in Stick
Mode
Yes Yes Yes
Selects mode of
operation: Panel
or Remote
STD
SLOPE
REPEAT
SPOT
PULSE
ON/OFF
Contactor ON/OFF
Operation
PANEL / REMOTE