I am having exactly the same problem, i have put the oscilloscope on the sine a cos and can see the return signal but in the DVT debugger the min and max voltages for the cos and sine are 0v,Hello, if anyone could help I would be most appreciative:- I have a Sevcon Gen 4 size 8 and it will not recognise the signal from the motor resolver (on pins 19,20, 31 & 32). In my experimenting I have determined that the controller will read a sin/cos signal on pins 19& 20 (sin/Cos) to pin 21 (encoder 0v) when the 'encoder' is set to sin/cos- but I can't use this as the exciter signal disappears after keyswitch toggle (and 5V appears across pins 9 & 21 which are there to power the encoder, when that is configured/set in the DVT). What is confusing is that I get a resolver exciter signal from pins 7&8 (when configured to single or multipole resolver), my assumption being that if it was not configured (in the hardware) for a resolver it would not give the exciter signal. I have been though every CAN address I have access to on the DVT and can see nothing that would inhibit the resolver signal into the controller (and have tried almost every combination of settings in an effort to figure it out). I am wondering if on that particular model they changed the pin designations for the resolver input. The controller model is 634H83210 and is not on the Sevcon drg I have, nor can I find any reference to it anywhere after a multitude of internet searches, any info on that would be gratefully received too. I am now trying to source a sin/cos encoder, but even that is presenting challenges so it would be nice to get the controller to recognise the resolver (fitted to a Meiden 60Kw motor from a Mitsubishi), but am presently at a loss. As I said at the beginning any help gratefully received.
Did you resolve this issue?