Encoder as tach?

[BR]

Hello. I'd like to limit the speed of this motor by using the encoder output
and converting frequency to voltage.
http://home.comcast.net/~benrest/index.html

I was told it was 2500ppr 5V TTL quadrature output. Tried 5V to "ENC. PWR"
and ground to "COMMON" and "SHLD". None of the other connections showed a
usable TTL output. Example; "ORANGE" showed a square wave well below 1V. How
do you hook up these things. I have no docs on this unit nor do I know
anything about encoders. The brushed DC motor runs fine however.

Your help appreciated.

Ben

--

 

[John Fields]

On Wed, 15 Oct 2003 09:19:50 -0700, "BR" <slackin@nonsense_comcast.net>
wrote:

Hello. I'd like to limit the speed of this motor by using the encoder output
and converting frequency to voltage.
http://home.comcast.net/~benrest/index.html

I was told it was 2500ppr 5V TTL quadrature output. Tried 5V to "ENC. PWR"
and ground to "COMMON" and "SHLD". None of the other connections showed a
usable TTL output. Example; "ORANGE" showed a square wave well below 1V. How
do you hook up these things. I have no docs on this unit nor do I know
anything about encoders. The brushed DC motor runs fine however.

---
Try pulling up the orange lead to +5V through a 10k resistor. There
should also be another wire which you'll need to pull up, and if you
look at the outputs when they're pulled up, with the motor running,
you'll see two square waves 90° apart in phase. You could probably use
1k pullups if you had to.

--
John Fields

 

[happyhobit]

You are measuring between the ‘A’ or ‘B’ outputs and +5 volts correct.

TTL output is 0 volts or high impedance. Measuring to ground don’t work.

Jay

--
..
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"I'm pullin' for you; we're all in this together", Red Green
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"BR" <slackin@nonsense_comcast.net> wrote in message
news:0vWdnSQ2gvco7hCiU-KYgw@comcast.com...

Hello. I'd like to limit the speed of this motor by using the encoder
output
and converting frequency to voltage.
http://home.comcast.net/~benrest/index.html

I was told it was 2500ppr 5V TTL quadrature output. Tried 5V to "ENC.
PWR"
and ground to "COMMON" and "SHLD". None of the other connections showed a
usable TTL output. Example; "ORANGE" showed a square wave well below 1V.
How
do you hook up these things. I have no docs on this unit nor do I know
anything about encoders. The brushed DC motor runs fine however.

Your help appreciated.

Ben

--

 

[Peter Bennett]

On Wed, 15 Oct 2003 09:19:50 -0700, "BR"
<slackin@nonsense_comcast.net> wrote:

Hello. I'd like to limit the speed of this motor by using the encoder output
and converting frequency to voltage.
http://home.comcast.net/~benrest/index.html

I was told it was 2500ppr 5V TTL quadrature output. Tried 5V to "ENC. PWR"
and ground to "COMMON" and "SHLD". None of the other connections showed a
usable TTL output. Example; "ORANGE" showed a square wave well below 1V. How
do you hook up these things. I have no docs on this unit nor do I know
anything about encoders. The brushed DC motor runs fine however.

Your help appreciated.

Ben

I expect the outputs are "open collector" - you will need to supply a
pull-up resistor (5K1 or so) to +5 to see a useful output.



--
Peter Bennett VE7CEI
GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq

 

[BR]

"John Fields" <jfields@austininstruments.com> wrote in message
news:2a1rovga3hmph19ivmrd0i9gudgitbgjls@4ax.com...

Try pulling up the orange lead to +5V through a 10k resistor. There
should also be another wire which you'll need to pull up, and if you
look at the outputs when they're pulled up, with the motor running,
you'll see two square waves 90° apart in phase. You could probably use
1k pullups if you had to.

--
John Fields

Thanks. 10K works fine.

Ben