Tweco 400 MSTP Arcmaster - Manual (Page 27)

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3.0 OPERATOR CONTROLS
3.01 ARC MASTER 400MSTP Controls
Figure 4. ARC MASTER 400 MSTP 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.
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 1 and pin J)
K Chassis ground
L,M,N Not used
1
3
2
4
5
9
10
11
6
8
7
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