Thermal Arc ARCMASTER 300 MST Operating Manual page 27

ON/OFF Switch
6.
This switch connects the Primary supply voltage to the inverter when in the ON position. This enables
the Power Supply.
When the welder is connected to the Primary supply voltage, the internal electrical components
may be at 500V potential with respect to earth.
Input Cable
7.
The input cable connects the Primary supply voltage to the equipment.
Voltage Input Select Switch (Smart Logic Switch)
8.
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 indication will be displayed
Do not alter the position of the Voltage Input Select Switch when the ON/OFF Switch is in the ON
position and the unit is powered up.
14/19 Pin Remote Control Select Switch
9.
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 position 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.
WARNING 6
WARNING 7
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