Need Help!- Heidenhain Encoder Decipher

[T63-A-700]

I have three Heidenhain encoders on a BP Series I that I need help deciphering the specs. They must be legacy Heidenhain encoders because I can not find any info on their website. I have also searched the CNCZone for assistance but have only found some reference to other ERO models from years past.

The encoders are labeled as:

ERO 115 125 [G1]

Id Nr 21Z 900 04

S Nr 16656XXX6

TIA,

Todd

[CDISMACER]

Hi Todd.. I might be able to track down some spec data for you. I just became a Heidenhain reseller here in Chicago, and my local factory rep is outstanding. He has access to some rather deep Heidenhain archives.. I'll toss the ID info past him and see what I can dig up..

Steve

[T63-A-700]

Hey Steve,

I would greatly appreciate the dealer help.

Thank you very much,

Todd

[Al_The_Man]

That may have been one of my older posts.
I have an older catalogue that show 5 models of ERO, all except one are 5v differential, the fifth is 11µa sinusoidal.
They appear to be through-hole shaft mount style.
Nothing that matches that number exactly, however.
If you are lucky, they will be 5v differential.
Al.

[T63-A-700]

I was thinking about your post from a later date regarding this same type of question.

The encoders connect directly to an interpolation and digitizing elctronics box. Sinusoidal input 11 microAmp and TTL output. My box is the without or 5 - fold. Is this good or bad? It looks as if the box will power the encoders.

From your old post, you may have thought that the Id Nr 21Z 900 04 was the counts / rev value (900).

What does your documentation indicate?

Todd

[Al_The_Man]

I am not so sure, usually the line count is indicated on the cover.
The documentation I have show ERO in series 1100, 1200, 1300 & 1400.
With the 1251 & 1450 being sinusoidal.
If you have the conversion boxes, you should be able to use them OK.
Al.

[hansdie]

Originally Posted by T63-A-700 I have three Heidenhain encoders on a BP Series I that I need help deciphering the specs. They must be legacy Heidenhain encoders because I can not find any info on their website. I have also searched the CNCZone for assistance but have only found some reference to other ERO models from years past. The encoders are labeled as: ERO 115 125 [G1] Id Nr 21Z 900 04 S Nr 16656XXX6 TIA, Todd

You have a ERO 115 encoder with 125 line counts manufactured G1, which is January 1983. I believe this is a 11uAp-p output.
The best would be to call Heidenhain and give them your Id nr and Model number. They should then be able to tell you if it is servicable still or what the replacement model is.

[T63-A-700]

Thanks for the info hansdie.

I was hoping they would be of higher count. My multiplier box will 5 X the 125 count (625 ). Man I hate that, how well of a resolution can I expect with 1:2 belt ratio (I do not have my screw data write now)?

Can you tell me how to figure the resolution whenever I have all my varibles?

Thanks,

Todd

[hansdie]

125 counts x5 = 625 x2 =1250
normally bridgeport ball screws are .200" per revolution
so 5 turns per inch...
1250 x5=6250 pulses per inch or 1/6250 =0.00016 inches per pulse.

Modern heidenhain controls internally subdivide the sine wave output of the encoder by 1024 where-as a ttl signal is subdivided only 4 times.

[T63-A-700]

Thanks for reply.

I follow everthing that you did in the calculation except for multiplying the encoder value by "2". I am asumming that is the gear (belt) ratio?

My screws are 5mm (.1969") / rev which you said .200" is typical for BP machines.

Other than that I other understand how the total resolution is calculated.

Thanks,

Todd

[hansdie]

yes the multiplying by 2 was for the belt gear ratio. Remember too that your controller will also subdivide the signal, again generaly 4times for a TTL signal

[T63-A-700]

If I am using MACH is it subdivided (decreased) or multiplied (increased)?