Tweco 300 MST Arcmaster - Manual (Page 25)

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3.0 OPERATOR CONTROLS
3.01 ARC MASTER 300 MST Controls
Figure 4. ARC MASTER 300 MST Power Source
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.
2 Remote Control Socket
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.
A J
B K I
C L N H
D M G
F E
Ａ Ｂ Ｃ Ｄ Ｅ Ｆ Ｇ Ｈ Ｉ Ｊ Ｋ Ｌ Ｍ Ｎ
E
Front view of 14
Socket Receptacle
5k ohm s
Figure 5. 8-Socket Receptacle
Socket Pin Function
A 24VAC auxiliary high side.
B
Input to energize solid state contactor.
(Contact closure between pin A and pin B)
C
5k ohm (maximum) connection to 5k ohm
remote control potentiometer
D
Zero ohm (minimum) connection to 5k
ohm remote control potentiometer
E
Wiper arm connection to 5k ohm remote
control potentiometer
F Current feedback Ifb = 100Amps/Volt
G
24/115 VAC circuit common, also
connected to chassis
H Voltage Feedback Vfb = 10 Arc Volts/Volt
I 115 VAC auxiliary high side
J
115 VAC input to energize solid state
contactor (Contact closure between pin I
and pin J)
K Chassis ground
L Not used
M Current Detect
N Current Detect
1
3
2
4
5
8
9
10
6
7
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