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SECTION 4: OPERATOR CONTROLS
4.01 ARC MASTER 400 MST Controls
Figure 4. ARC MASTER 400 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
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 Not
Used
M Current
Detect
N Current
Detect
2
4
5
8
9
10
1
3
6
7