Tweco 400 MST Arc Master - Manual (Page 21)

400MST
3
OPERATOR CONTROLS
3 – 2
CAUTION
Loose welding terminal connections can cause
overheating and result in the male plug being fused
in the bayonet terminal and /or melting of the hous-
ing (case).
5. Remote Control Socket
The 19 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.
6. ON/OFF Switch
This switch connects the Primary supply volt-
age to the inverter when in the ON position.
This enables the Power Supply.
WARNING
When the welder is connected to the Primary sup-
ply voltage, the internal electrical components
may
be at 720V potential with respect to earth.
7. Input Cable
The input cable connects the Primary supply
voltage to the equipment.
8. Voltage Input Select Switch (Smart Logic
Switch)
User selectable switch.
A manual slide switch selects the proper input
voltage range. If this slide switch is not set to
the position that matches the input line voltage,
the Smart Logic will inhibit the welding power
source from turning on and a warning indica-
tion will be displayed.
WARNING
Do not alter the position of the Voltage Input Select
Switch when the ON/OFF Switch is in the ON posi-
tion and the unit is powered up.
9. 14/19 Pin Remote Control Select Switch
User selectable switch.
Position this switch for the remote control
device socket to be utilized. The unselected
Remote Control Socket is disabled at this time
and cannot be utilized. Do not alter the posi-
tion of this switch while one of the Remote
Control Sockets is being utilized.
10. 24VAC Remote Device C/B
Push to reset. Controls the 24VAC power
source for the wire feeders controlled through
the Remote Control Sockets.
11. 115VAC Remote Device C/B
Push to reset. Controls the 115VAC power
source for the wire feeders controlled through
the Remote Control Sockets.
2
Weld Parameter Descrip-
tions for 400MST
Figure 3-2: 400MST Front Panel with Parameter Description
Socket
Pin
Function
A Contactor circuit (+15 Volts).
B
Contactor circuit in, (closure between pin A and
Pin B will energize output.).
C
Scaled output voltage signal: Vfb = 10 Arc Volts/
Volt
D 24 VAC auxiliary power high side.
E 115 VAC auxiliary power high side.
G Chassis ground.
H Remote control maximum.
J Remote control wiper (0 - 10 Volts).
K Remote Control minimum.
J Remote control wiper (0 - 10 Volts).
L Control circuit common.
M Arc Establish = +12 Volts
N Control Circuit common.
P 24 VAC auxiliary power high side.
R 24/115 VAC neutral
S N/C
T N/C
U Scaled output signal: Ifb = 100 Amps/Volt
V N/C