ESAB Origo Feed 304 M12 Series, Service Manual

Page: 25 / 40

DESCRIPTION OF OPERATION
0740 800 144 - 25 - © ESAB AB 2018
2-stroke
When switch 13SA1 is open, 2-stroke control mode is selected. This means that closing the
welding torch trigger switch starts the wire feed motor, opens the gas valve and closes the
power source contactor.
Releasing the switch stops the motor, releases the contactor and closes the gas valve. If
crater filling and/or burn-back time are operative, they will be activated before welding
ceases.
4-stroke
When switch 13SA1 is closed, 4-stroke control mode is selected. This means that first
closure of the trigger switch operates the gas valve, with the wire feed motor starting, and the
power source contactor operating, when the trigger switch is released.
Closing the trigger switch for the second time stops the motor and de-energises the contactor
in the power source. Releasing the switch closes the gas valve. If crater filling and/or
burn-back time are operative, they will be activated before welding ceases.
13AP1:7 Burn-back time
The burn-back time is the time from when motor braking starts until the machine contactor
opens. It can be adjusted by potentiometer 13RP3 between 0–0.5 s.
13AP1:8 Wire feed speed
Adjustment on the front panel of the feeder unit
Potentiometer 13RP1 controls the wire feed speed over a range of 1.9–25 m/min.
Adjustment using the remote control unit
Wire feed speed reference from the remote control unit
Potentiometer 13RP1 is disengaged when a remote control unit is connected to input
13XS13. The circuit board microprocessor senses that the remote control unit is connected
by means of the voltage drop across diode D35. When the remote control unit is connected,
the voltage on connector E11 cannot drop below about 0.6 V.