×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

encoder monitorig

encoder monitorig

encoder monitorig

(OP)
i have a 1024 pulse encoder using channel a  and not a feeding into a buffer card which diverts off to find a speed reference for several other machines. this reference is varying too much at the machine end, what is the best way to monitor the encoder pulses, to determine whether it is the buffer box or encoder that is faulty, being that i am sure the reference encoder coupling is ok and that it is being driven at a constant speed. (speed fluctuation is about +/- 10rpm in 1255rpm moving constantly

RE: encoder monitorig

I would monitor the input and output of buffer with a 2 channel oscope.  

Most of time when a encoder goes bad you can tell by looking at pulse stream.

If it is a noise/wiring problem the oscope will pick it up also.

Barry1961

RE: encoder monitorig

Tip: Use the pulse-width trigger available on most digital scopes. This is very effective if you are running constant speed. Not so easy when the speed is changing continously.

The pulse width trigger will pick up any glitches and show them. If it doesnt trig, then you can be sure that pulses are OK. (You will have to verify zero, amplitude and 90 degree shift first).

Gunnar Englund
www.gke.org

RE: encoder monitorig

Hi bigheadted,
This is quite an easy fault to find, first check your supply to the encoder with a scop pref 20mhz.It must have no spikes or noise on it, Second look at the output pulses these must be perfectly square if you under stand what i mean and have no spikes or ripples any were. check the in put and out put of your buffer look for good clean signals.
There is also one other point,have you ckecked the bearings on your encoder as bearing noise does effect encoder pulses. also what machine is it and do you have any tacos in the same system. As you will know A ataco is a generator look at the output from these if you have them these must have no ripples or spikes othere wise the drive will rampup to match that signal.also check for screen being connected one end only as both ends will cause current loops and induse noise that will cause bad signals

Barry.

RE: encoder monitorig

laundry; he got no encoder.  He gots a metal to metal proximity sensor do-hicky. That u feed power to and all it puts out is a pulse train, often just a open collector pulse train.

RE: encoder monitorig

itsmoked
What are you talking about he said he as a 1024 pulse encoder do-hicky.

Barry.

RE: encoder monitorig

Gads you are correct laundry! Standby while I remove foot from mouth... I confused this post with the "how many pulses can I get ouyt of one tooth counting proximity sensors on my windmachine" post.   Now to quietly back out of this post....  

RE: encoder monitorig

I won the bet! Told my friend that Smoked confused the two threads. "How do you know?" he asked. "Well, you know Smoked, I said"  So, we are going to have those beers on him now. Thanks Smoked!

Gunnar Englund
www.gke.org

RE: encoder monitorig

Hahahah, Make the heck sure you toast me for that!

Yeah and wouldn't you know it, the one time I was teasing laundry for a few spelling errors.  Twas, karmic it twas.

RE: encoder monitorig

(OP)
thanks anyway lads

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources