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How to build Overspeed Monitor Circuit

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chelsea may

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Dear Friends,

I am a newbie in Electronics so I will appreciate anybodys technical assistance to build a simple Adjustable Overspeed Monitor Circuit using an inductive proximity sensor as a sender to a receiver circuit which trigger a 24 vdc relay if the motor shaft (monitored by proximity sensor) speed reaches somewhere between 500 to 1000 rpm, sorry if this inquiry does'nt make sense, any comment and assistance is very much appreciated.

Its a great pleasure to know this site and the members who contributed and happy to share their knowledge and expertise.

Cheers!
 
Welcome to the forum.

As you may probably infer, there are many ways to solve the problem you described. You can use a PIC as a frequency counter, counting the pulses off the shaft and reacting to an upper speed limit. You can change the upper speed limit setting perhaps with a set of dip switches.

If you're not into programming parts, then you can to this discretely using TTL chips or programmable logic.

There is even an Analog way to do this using a PLL chip and a variable VCO (through a certain range of speeds).

There are surely more ways as well.
 
Search lm2917 or go to National Semiconductors site and look for it. It will do exactly what you want. It will even latch out at over speed if you need. Good luck
 
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