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johno71

Noise Noise Noise

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Hello All,
I am new to the forum and electronics in general.  I have designed some circuits to monitor a 3 phase 230volt electric motor.  I am having a problem with the electrical noise spikes generated by the contactor in the motor causing my circuits to act up.  I am at a loss for filtering this noise.  I have tried a line filter on my power supply and have caps all over the place on the circuit boards.  This has helped but has not taken care of all of the noise.  Any  other suggestions. 
Thanks,
John

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Care to post a schematic?

It sounds like you're having difficulties interfacing the AC circuit with the DC control side.

How are you ensuring there's adequate isolation between the AC and DC circuits?

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Is the negative rail of the DC power supplies connected to earth?

I take it the neutral is earthed?

Please provide more information: how do the control boards connect to the motor?

Is there any isolation between the AC and DC supplies?

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