THEORY OF OPERATION
E-6 E-6
RANGER 305D
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Remote output control:
The Weld control PC board automatically detects
when a remote control potentiometer is connected to
either of the Amphenols. In “CC-STICK”, “DOWN-
HILL PIPE” or “CV-WIRE”modes, the front panel out-
put control is disabled when a remote control device
is connected. In “TOUCH STARTTIG” mode, the
front panel output control potentiometer is used to set
the maximum output value. The remote potentiome-
ter varies the output from minimum to maximum value
set by the front panel control.
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
“REMOTELYCONTROLLED” 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 identicaldigital 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.