Fanuc Pulsecoder

[dksoba]

Hi All,

Got a few Fanuc motors recently. I took one of the pulsecoders off so I can connect to it. I don't have the right connector so I need to remove the connector and manually wire in. To my surprise there are actually holes on the PCB for soldering headers or wires into. They're even labeled:

0V, 5V, T0, CS, D0, D8, Pz... See picture. It seems to me that A/B would be incremental encoder style A/B, and that C1-C8 would be 8-bit Absolute Encoder?

Not Sure, what I want to make sure is that 5V and 0V are indeed +5v/Gnd. In that case I can apply a regulated 5V to it and go from there. Incremental encoding is all I really need.

Matt

[Al_The_Man]

I have posted a few previous outlines on the Fanuc encoder, the last three numbers tell what type encoder, absolute or incremental/differential.
The C1-C8 is the proprietary commutation code for the AC servo motor.
There is a member here that has built a circuit mod for the commutation to standard BLDC.
You should find the PDF posted previously on the commutation pattern.
Al.

[dksoba]

Thanks Al_The_Man,

I've reviewed your other posts. It seems like I can get what I need by both referencing those and experimenting. I don't need the commutation pattern, I just need an index/quadrature encoder. I'll be using the angular position information for field oriented control in the AC servo controller I'm building.

Matt

[Al_The_Man]

As I mentioned, Fanuc mainly use both 5v absolute and 5v RS485 Quadrature incremental types, but there are a few out there that appear to be low signal quadrature sine wave output, these are similar in signal to the Heidenhain low signal sinewave.
So if you cannot get a 5v signal out, they are probabally this type.
Al.