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THEORY OF OPERATION |
Remote output control:
The Weld control PC board automatically detects when a remote control potentiometer is connected to either of the Amphenols. In
Electronic Output Contactor:
The operator also has the ability to control when power is delivered to the output studs. This is accom- plished by signaling the control PC board when to send the PWM signal to the chopper module. Turning the PWM signal on or off has the same effect as acti- vating or deactivating an output contactor, and is accomplished by closing the circuit between the #2 and #4 leads. The welding terminal switch closes this circuit when it is placed in the “WELD TERMINALS ON” position. When the switch is placed in the “REMOTELY CONTROLLED” position, the circuit is closed by a TIG foot pedal, a control cable type wire feeder, or other remote control devices that can be plugged into either the 6 pin or the 14 pin Amphenol.
Digital Meters:
Two identical digital displays are connected to the control PC board and are used to indicate weld out- puts Amps and Volts. When no current is flowing, the machine is in “preset” mode and only one of the dis- plays will be active. If mode switch is set for “CV- WIRE”, only the volts display will be active; in all other modes, only the amps display will be active. When weld current is flowing, both displays will indi- cate actual weld volts and amps.
