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Motor Proofs

01/08/2009 5:14 PM

Does anyone know of any other form of motor start proof (current proof) other than the old loops around wires? I am working with very small space and cannot work the larger current wire windings for motor proof into my device. Any ideas? Thanks

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Guru
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#1

Re: MOTOR CURRENT START PROOF

01/08/2009 6:46 PM

Are you trying to measure the starting current?

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#2
In reply to #1

Re: MOTOR CURRENT START PROOF

01/08/2009 8:27 PM

Yes, read the start and run currents,and also use to proof the motor as a saftey, much ther same was a heating system does.

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#5
In reply to #2

Re: MOTOR CURRENT START PROOF

01/09/2009 11:14 PM

It sounds like you want current monitoring and you can do that with several new devices from Phoenix, AB, Siemens, and others. Many of these can be added after the fact via clamp on probes and remote monitors. They can be as integral or seperate from your controls as you choose.

We design in current monitoring on the mains of AC and on the secondarys of DC drives. For AC starters we monitor the secondarys.

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#3

Re: MOTOR CURRENT START PROOF

01/08/2009 9:46 PM

Not nearly enough info. For instance:

How much current?, what voltage?, AC or DC?, how much space is available?, accuracy required? output signal type (digital or analog)?, etc. etc.

For example, if it s a 10,000HP 12,470V motor, the current transformer is going to be a lot different than for a 1/16HP 110VDC motor.

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#4

Re: MOTOR CURRENT START PROOF

01/08/2009 10:55 PM
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#6

Re: Motor Proofs

01/10/2009 1:59 AM

ZEN PIG

Does the power feed to your motor originate from a MCC ( motor control center ) ?

If it does why not install your current sensors there ? You should have more than enough space. Ed

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#7

Re: Motor Proofs

01/10/2009 10:40 AM

Zen pig,

Another approach would be verifying that the output shaft or driven shaft on the load is rotating. This can be done with a number of devices and gives you the additional confirmation that the equipment is operating.

--JMM

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Anonymous Poster
#8

Re: Motor Proofs

01/12/2009 8:44 PM

There is millivolt monitoring of a shunt in series with the motor.The resistance can be very low and size can be very small, depending on motor size. A zero-speed switch is also a possibility. Please provide more info on application for more specific information. ---------------------HTRN--------------------------------------------------------

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