following error and velocity

Resolver scale is .0787(2mm). My machine documentation lists the sine and cosine wiring by color, but doesnt state which of the rotor wires is pos and neg. One is red/white, one is yellow/ white. Ive swapped them back and forth and the result is the same, or so it appears. Ill.check the sine / cosine tomorrow( its late in fl). The shape of the noise stays the same with in creased speed. These shots were .100 inch jogs at 25 ipm. A longer jog at a speed, seems to just get more of the same wave form. Thanks as always.

Swapping the rotor wires will not change anything except the index position (it should change 1 MM)

25 IPM is 5.291 turns per second on your resolver and the "noise"
is about 20 Hz which is pretty much what you would expect if the 7I49
inputs were overloaded (errors at 4 sine/cosine peaks per turn x ~5 turns /second = ~20 Hz)

So it looks more and more like too much input signal

Did you measure the sine/cosine voltages across the pins and at their peak values (which requires turning the shaft)?

Changing the resolvers to channels 3,4,5 got rid of the "noise" and the bump-bump at low speed. Could there be a change made to the 7i49 to reduce the input voltage for all the channels, in my case I only had 3 axis with resolvers, but it would be easy to have 4? Thanks again for your help.

JR

Theres a 7I49 HV version for high output resolvers (is has lower input gain)

This would allow all 6 channels to work with the resolver type you have