Operator Controls; Arc Master 300 Mst Controls - Thermal Arc ARCMASTER 300 MST Operating Manual

3.0 OPERATOR CONTROLS

3.01 ARC MASTER 300 MST Controls

1
3
1. Control Knob
This control sets the selected weld
parameter, rotating it clockwise increases
the parameter and is indicated on the
digital meter. Pushing the knob in
previews the actual welding voltage while
welding.
Remote Control Socket
2
The 14 pin Remote Control Socket is
used to connect remote current control
devices to the welding Power Source. To
make connections, align keyway, insert
plug, and rotate threaded collar fully
clockwise.
E
Ａ Ｂ Ｃ Ｄ Ｅ Ｆ Ｇ Ｈ Ｉ Ｊ Ｋ Ｌ Ｍ Ｎ
5k ohm s
Figure 5. 8-Socket Receptacle
2
4
5
Figure 4. ARC MASTER 300 MST Power Source
A J
B K I
C L N H
D M G
E F
Front view of 14
Socket Receptacle
19
9
10
11
Socket Pin
A 24VAC auxiliary high side.
Input to energize solid state contactor.
B
(Contact closure between pin A and pin B)
5k ohm (maximum) connection to 5k ohm
C
remote control potentiometer
Zero ohm (minimum) connection to 5k
D
ohm remote control potentiometer
Wiper arm connection to 5k ohm remote
E
control potentiometer
F Current feedback Ifb = 100Amps/Volt
24/115 VAC
G
connected to chassis
H Voltage Feedback Vfb = 10 Arc Volts/Volt
I 115 VAC auxiliary high side
115 VAC input to energize solid state
J contactor (Contact closure between pin I
and pin J)
K Chassis ground
L Not used
M Current Detect
N Current Detect
6
8
7
Function
circuit common, also