Re: [ExternalEmail] Re: [4x6bandsaw] motor acted funny the other day
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"You COULD however use a 555 Timer, configured as a one shot, triggered by your sensor, feeding a solid state relay."
A switch and timer will work. It will need to be reset at some point. It will not be as sensitive or adjustable as current sensing.?
¡°So maybe 1 second before the control circuit cuts the power. Is that too long a time to wait?¡±
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There is an additional consideration.? How long does the motor take to come up to a speed above your ¡°threshold¡±?
That needs to be significantly faster than your threshold value.
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¡°An optical sensor on the motor fan could be rigged to give many more pulses per rev,¡±
While optical should be reliable enough, in the general case I would go with sensing the shaft. Not all motors have an accessible fan.
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While there are multiple ways to control it, an Arduino with a ¡°relay shield¡±, or Ras Pi sort is probably the easiest to implement these days.
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You COULD however use a 555 Timer, configured as a one shot, triggered by your sensor, feeding a solid state relay.
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R James (Jim) Klessig P.E. | Senior Power Systems Engineer |
Electrical Reliability Services, VERTIV
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