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I need to troubleshoot some "kennedy -mcmaster" zero speeds....

I haven't found much information on Google, so perhaps they changed names? Don't exist anymore?

There are 4 wires...hot, neutral, and 2 signal wires that go back to the PLC?

I believe i need to start the conveyor and look for pulses on the signal wires with my multimeter...any advice for troubleshooting these devices? Thanks
 

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If what you have are true zero speed switches, they will be directly coupled to the shaft (typically the tail pulley shaft on belt conveyors) and will have a steady state signal once the shaft reaches a pre-determined speed. In my limited experience, this is kind of the old fashioned way to do things. Every modern setup I've seen ueses inductive prox switches to send a pulsed input as the pulley rotates. This is done either by directly sensing differences in the face of the tail pulley or sensing rotation via an adaptor like a whirligighttp://www.go4b.com/usa/products/speed-switches/whirligig.asp.
 

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Discussion Starter #6
If what you have are true zero speed switches, they will be directly coupled to the shaft (typically the tail pulley shaft on belt conveyors) and will have a steady state signal once the shaft reaches a pre-determined speed. In my limited experience, this is kind of the old fashioned way to do things. Every modern setup I've seen ueses inductive prox switches to send a pulsed input as the pulley rotates. This is done either by directly sensing differences in the face of the tail pulley or sensing rotation via an adaptor like a whirligighttp://www.go4b.com/usa/products/speed-switches/whirligig.asp.

This is what I have, http://www.plccenter.com/en-US/Buy/KENNEDY-MCMASTER INC/M801

I guess its just a 4 wire proximity sensor. But, it looks like its obsolete. So, I think I will just try and talk them into replacing them.

Although, I would like to be sure they are bad...because if I do install new ones and the NEW ones dont work ill feel like an ASS!
 
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