Folks,

I'm in the process of retrofitting an older Datron machine that was stepper-based to a new servo driven LinuxCNC control system. While putting together a test setup of the servo drives and motors prior to machine installation, I ran across a strange issue. I planned to use the drive /SV-ON signal on the input side to enable the drives, however I'm seeing something really weird when I connect +24 to pin 47 on CN-1 as is indicated. Upon connecting the common input power, all of the encoder outputs drop out. As soon as I remove power from pin 47, the encoder outputs are re-enabled. Anyone have an idea what might be causing this? From everything I've seen, there should be no interaction between the input pins and the encoder output.

Thx!
-Dave