ESAB Origo Feed 304 M12 Series, Service Manual

Page: 23 / 40

DESCRIPTION OF OPERATION
0740 800 144 - 23 - © ESAB AB 2018
The crater fill function operates as follows:
Phase 1
When in 2-stroke control mode, releasing the welding torch trigger switch reduces the wire
feed speed to 84% of its original value. In 4-stroke control mode, crater filling starts when the
trigger switch is pressed for the second time. The optocoupler is activated, supplying a signal
to the power source that crater filling has started, causing the power source to reduce its
output voltage.
Phase 1 continues for a time as determined by the setting of potentiometer 13RP4, up to a
maximum of 1.27 s.
Phase 2
Phase 2 starts when phase 1 finishes. The wire feed unit further reduces the wire speed to
84% of the value during phase 1. The optocoupler turns off, giving the power source a signal
further to reduce the voltage. Phase 2 continues also for a maximum of 1.27 s.
Phase 3 and 4
Phases 3 and 4 are repeats of phases 1 and 2. After phase 4, during which wire feed speed
is 50% of the original value, welding concludes with the preset burn-back time.
If, when in 4-stroke control mode, the welding torch trigger switch is released while crater
filling is in progress, crater filling will be interrupted.
Wire feed speed and welding voltage during crater filling
13AP1:4 Voltage adjustment
This function is only used by units with control panel M13 .