Heidenhain ERN 1120 encoder on spindle motor

[CharlesRohland]

Hi All,

I am using a Heidenhain ERN 1120 on my spindle motor, as that is what came with my CTEK VMC.

According to the data sheet, that I found and as Marty has previously posted (below) the ERN series has grey wire for the B channel.



Problem is I don't have a gray wire out of the encoder!

I have

Blue
Yellow
Brown
Green
Pink
Red
Black
White

Any suggestions?

Thanks Nigelo and Tom for help on previous thread.

Thanks
Charles

[cncsnw]

If you strip your cable jacket back a little farther, can you tell whether the wires are twisted together in pairs?

If you know which wire colors are paired together, that will significantly reduce the number of permutations you need to consider.

[CharlesRohland]

Thanks CNCSNW.

Pairs are black & white, red & pink, green & blue, yellow & orange.

I have found a SUMTAK data sheet for the Heidenhain ERN, which is more accurate to my wire colours and seems to match pairs above, hopefully this works.

[CharlesRohland]

Seems like I missed the part in "Encoder Basics" where it is noted that TTL encoders are not suitable

Heidenhain ERN 1120 is TTL

[cncsnw]

It is the vocabulary that is incompatible, not the encoders.

When Centroid says "TTL", they mean open-collector outputs with just one wire per channel (in contrast to differential-driver outputs with two wires per channel. One-wire open-collector outputs are not suitable for use with Centroid controls.

When Heidenhain says "TTL", they mean a 5V square wave (in contrast to their analog current-mode or voltage-mode sine-wave outputs). Heidenhain's "TTL" outputs are differential-driver outputs, and are suitable for use with Centroid controls.