Looking for an encoder signal multiplier

[funguy123]

We have a customer who has a 512 counts/rev (A A\ B B\) encoder mounted to a rotating shaft. They have a custom PC HMI application that expects to see 2048 counts/rev for position tracking purposes. This application can not be reconfigured.

Has anyone heard of an encoder signal multiplier that you can wire the encoder to as an input, configure the unit for say quadrature (in my case) and on the output side receive an equivalent number of pulses (2048 in my case)?

Any information would be appreciated,

Thanks,

Greg

 

[sreid]

The most straight forward solution is, of course, to replace the encoder with one that has the correct line count.

 

[funguy123]

I agree, but from what I have been told (outside the loop), is that they want to keep the existing encoder for whatever reason.

 

[cswilson]

Greg -- When you say a 512-count/rev encoder, are you saying it has 512 lines per revolution? That is, does it put out 512 full quadrature cycles per revolution?

(To be a bit pedantic: an encoder does not have "counts". A "count" is a unit of a "counter". An encoder has "lines" and produces waveforms with "cycles".)

If you have a 512-line/rev encoder, the standard "times-4" decode produces 2048 counts per revolution. In this case a standard encoder interface chip such as the Avago (formerly Agilent, formerly HP) HCTL-20xx will automatically produce 4 counts per line.

You may just have a definitional problem here.

Curt Wilson
Delta Tau Data Systems

 

[funguy123]

Curt,

Thanks for the tip. We have come up with another solution that I think will be much "cleaner".

But to answer your question, to my knowledge the existing encoder outputs 412 full quadrature cycles per revolution.

And you are right, I should have checked my descriptions.

Thanks for your help and that device looks promising.

-Greg

 

[alexit]

Look at L&B products, you need interpolation electronics for multiply encoder outputs to get higher feed back:

http://www.lenord.com/technical_info/TI214_e.pdf

Please note this has SINE inputs and TTL outputs. They also have other version for TTL in/out signals.

 

[nbucska]

Greg:
Pse read my FAQ and answer a few questions:

Is the encoder used for both speed and position control?
What is the speed range? acceleration?

There are several ways to solve the problem depending on
the actual requirements and limitations.



Plesae read FAQ240-1032
WEB: <

http://geocities.com/nbucska/>

 

[rawelk]

If it turns out that you really do need a pulse multiplier then the MKS Controls model FM151 should also be able to do the job (first, download their PDF manual and verify).

http://www.mks-control.de/encoder_divider.html

Iv'e never used this product, but have used their IT251 divider.