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Zekeman, Thanks for the information again. The weld tip is 90 degrees to the axis of rotation. If you were to view the elliptical part as sitting on a table from above and rotating, the weld tip would be laying on the table, 90 degrees to the axis of rotation of the ellipse and pointing at...

Zekeman, Thanks for the info. Yes, the rotational axis is at a right angle to the workpiece axis. I'm not following the math (I'm a PLC guy), can you explain the terms a little better? Thanks, Funguy

Zekeman, And that second cam I believe I need to advance/retard the ellipse would have go from 0-360 degrees and have points of accell and decel (approximately 4)and points of matched speed between the two (when the narrow point of ellipse is at the weld point).

Zekeman, I agree, the cam driving the linear axis off of the elliptical shape is shaped like 2 lobes up, down, up, down, up. My question is, will I need to advance or retard the speed of the rotary elliptical axis so that I get a nice consistent, uniform weld on the edge of the ellipse, no...

I have a question on how to do the following application with 2 servomotors that are being controlled from the same motion controller: Imagine you have an elliptical shaped part rotating about an axis through it's center. This is being rotated at a constant velocity by servo #1. Then you have...

Thanks fellas, I think we are going to go the SSR route. We will replace the cards with SSR cards and then use another set of SSRs powered by the cards to drive the loads. Dumb question: There are no gotchas when it comes to SSRs like derating them for inductive loads or anything right. I...

Thanks for the input guys. I agree as well. With an inductive load the contacts are derated quite a bit right? So with a 1.25 A load on 2 A contacts derated by X amount with this amount of cycles this could be why we are seeing the failures? How many cycles are PLC relay contacts typically...

I forgot to mention, this is a relay contact output module.

Having numerous 24VDC (rated @ 2A continuous) output cards that are going bad over the past year (a point or two will remain ON/OFF.) Cards are 3 years old. 16 point in 2 groups of 8 with. The outputs are 24VDC Solenoid Control valves (rated @ 1.25A with built in surge suppression). They...

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...

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

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...

You may find this article interesting, it's a slide rule exhibit built at my alma mater, Purdue: http://news.uns.purdue.edu/html4ever/2004/040830.Alleman.sliderules.html Enjoy!

Thanks itsmoked and machmech. I am using an oscope to look at the A and B channels as well as \A and \B. Looks good. I appreciate the help!

Itsmoked, Thanks again! So power up the encoder and connect to the A and B channels with a 2 channel scope? Haven't done this before. Thanks, Gschmelt

Thanks itsmoked. Turned out if I switched the contact side signal and common leads that it worked fine. thanks for your help though!

If I have an industrial 24VDC incremental optical encoder with A and B channels in the field (say a dynapar/danaher encoder), how can I verify that it is working properly? Do I use an oscope and connect to the A and B channels to check that they are properly 90 degrees out of phase? Anything...

Itsmoked, The relay is supplying the PLC input circuit with a path to ground is what I meant by switching 0VDC. Phoenix Contact Relay info: PLC-OSC-24DC/24DC/2 P/N 2966634 Here is the phoenix link...

I have a Phoenix Contact 24VDC Solid State Relay that I have a Sick Optic Photoeye wired to that is PNP. The contacts of the relay are switching 0VDC to the input of a PLC wired for sinking. The sensor is activating the relay transistor and is working fine. My issue is whether the Photoeye is...