Replaced the contactor ,and the IGBT's.
I have four boards attached to each scr,the fourth one is attached to to scr's.
There are 5 scr's.
The last one attached to two scr's ,led lights briefly,but goes out.
But that is not the one I am measuring lower voltage.
Those boards driving the scr's are controlled by a controller board and a firing board which are seated in a mother board.
Replaced the firing board,but not the other two set beings that the controller board has 8 or nine pots on it to adjust speed,decel and acel.
Waiting on the tech.manual on this.
It is called 384,the drive that is.
Why 5 connections?
Why 5 scr's?
