Fanuc Serial Pulse Coders - Red cap servos, mesa 7i76e, how to?

Hello, 

I am working with an early 90s (installed 1992) Hardinge Conquest Model CS-51. I have installed Allen-bradley Ultra3000 drives for the Fanuc red-cap servos (10s, 10s, 5s, 20s models). Today in testing I realized that the encoders are "PULSE CODER SERIAL C" type. Specifics: PART NUMBER: A290-0561-V571, (A860-0350-T011) on two of the motors, I haven't popped the cap off on the others. 



Currently I have wired in a MESA 7i76e to control this machine, what would be the most cost effective way to read these encoders? I would really like to not have to replace the encoders. 

I also have a MESA 7i97 available if that makes it easier, and the Ultra3000s can take analog input or step/dir so either card would work in this setup - it just depends if either can directly interpret the serial encoder information... My research is falling short, maybe someone can point me in the right direction. 

I'm aware of the Pico systems stuff, but thats another 600USD + (for the 4 servos: x z turret & live tool) to get the job done, while there seems to be some [of the encoders from the serial pulse coder line] that mesa cards and parallel ports can read direct.

Any help would be much appreciated!

Hostmot2 has support for the older RS-422 (4 wire = req/data) Fanuc pulsecoders
Can you find the pinout of your encoders?

Yes, it’s 4 wire - here’s a section of the schematic that labels the wires: 

 

Labels read: SPD, *SPD, SPQR, *SPQR. 

Earlier today I plugged those four wires on the live tool motor into the encoder input on the ultra3000 drive with 4.7k pull-ups to 5v thinking it was an incremental pulse coder… I’m hoping that didn’t cause damage 

OK that's probably supported.

When I get a chance I can make firmware for a 7I76E with one Fanuc
channel on the serial expansion port for testing. I seems that that's a 1M
CPR encoder.

That would be great, thank you. 

I’ll promptly flash my board and run some tests once that’s done. 

Actually its easier to test this on a 7I97/7I97T

Do you have a 7I97 or 7I97T? 

Great, yes I have an unused 7i97. Let me know if you need any other info. 

Thanks! 

 

Great, thank you. I will flash it tomorrow morning and see what I can figure out. 

 

Haven't gotten very far... can't seem to connect correctly to the 7i97 card. Here's what I know:

-Setup via 'edit connections' gui
-IPv4 settings as 10.10.10.11 netmask 8, checked 'use this connection only for resources on its network' under routes.

When I ping 10.10.10.10 the LEDs flash on the 7i97 in a certain sequence and terminal gives:
No detection of ethernet board from mesaflash.

Pinging 192.168.1.121 does nothing, terminal hangs.

Jumpers W16 & W17 are both in low position.

Board was opened from factory seal this morning.

Let me know what to look for next. Thanks!