Thermal Arc ARCMASTER 300 AC/DC, Service Manual

Page: 29 / 116

300ACDC
4
OPERATOR CONTROLS
4 – 6
5
Power Source Features
Table 4-6: Power Source Features
Feature Description
New Digital
Control

Almost all welding parameters are
adjustable.
Touch Panel
Switches

Touch switches eliminate
mechanical damage.
Front Control
Cover

Protects front panel controls.
Digital Meter

Displays selected weld parame-
ter value.

Displays weld current when weld-
ing.

Displays weld current for 20 sec-
onds after weld has been com-
pleted.

A selected weld parameter value
can be adjusted at any time even
while welding.
Intelligent
Fan Control

The intelligent cooling system is
designed to reduce dust and for-
eign material build-up, whilst pro-
viding optimum cooling.

Fan speed reduces approximately
30 seconds after machine is
turned on.

Fan speed increases when inter-
nal components reach operat-
ing temperature.
ON/OFF
switch

Primary voltage Supply ON/OFF
switch located on rear panel.
Voltage
Reduction
Device (VRD)
Reduces the OCV when the power
supply is not in use. Eliminates the
need for add on voltage reducers and
has no effect on arc starting.

VRD fully complies to IEC 60974-1

When Stick mode is selected the
green VRD light is ON when not
welding and red when welding.

When in TIG modes VRD is off.
Control Knob

For the selected weld parameter,
rotating the knob clockwise
increases the parameter.

Rotating the knob counter-clock-
wise decreases the parameter.

A selected weld parameter value
can be adjusted at any time even
while welding.

Pushing the knob in displays
actual arc voltage.
Self
Diagnosis
Using Error
Codes

An error code is displayed on the
Digital Meter when a problem
occurs with Primary supply volt-
age or internal component prob-
lems. Refer to troubleshooting
guide.
Save/Load
function

A total number of 5 programs can
be saved into the 300ACDC
memory.
SAVE the Current Weld Parameters
into Memory.

Press the SAVE button.

Select a memory location by rotat-
ing the control knob, 1 to 5 is dis-
played on the meter.

After selecting the desired mem-
ory location (ie 1 to 5), press the
right scroll button and the
machine will give a beep to con-
firm the weld parameters from the
control panel are saved.
LOAD (retrieve) a Program to Control
Panel.

Press the LOAD button.

Select a memory location by rotat-
ing the control knob, 1 to 5 is dis-
played on the meter.
After selecting the desired memory
location (ie 1 to 5), press the right scroll
button and the machine will give a beep
to confirm the weld parameters are
loaded onto the control panel.
Feature Description