Service manual

Edition 101222
-- 21 -- s1Cad160
AP2:3L. Short arc control
The voltage reference is proportional with different coefficients to:
a. wire feed speed reference
b. voltage on the Umin input
c. voltage on the Upot input
In the previous solution the source a. was replaced by the EMF -- voltage
proportional to the actual wire feed speed, i.e. the EMF voltage was 0, when the
motor was stopped.
In one or either way, the voltage reference was in relation to the wire feed speed.
In the actual solution it is achieved by grounding pin 18 of CN6. In previous
solution, the EMF signal was delivered to micro controlled and then subtracted from
the reference with adequate coefficient.