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Thread: Diode in series with AC coil
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20-01-2019, 06:40 PM #1
Diode in series with AC coil
Not much knowledge of electrics or electronics.
A contactor coil for the three phase supply to a large inverter drive for a compressors motor. There's a second inverter driven compressor on this system but it doesn't have a diode? before the 110VAC contactor coil. Anyone familiar with this being done? Thanks.
diode series ac coil.jpg
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20-01-2019, 11:22 PM #2
Re: Diode in series with AC coil
A bit of an educated guess here.
N1 on the diagram says 110V so the contactor coil is a 220V one. When it isn't switched the N1 has a path to another phase somewhere. Diode stops the current in this situation.
Cheers,
Andy.
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21-01-2019, 10:39 AM #3
Re: Diode in series with AC coil
Hi,
It’s probably a typographical error
Diodes are generally associated with DC control circuits (not so much AC)
In this instance it would be acting as a half wave rectifier - reasons of practical application are questionable
CheersLast edited by HVACRsaurus; 21-01-2019 at 10:46 AM.
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21-01-2019, 06:59 PM #4
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21-01-2019, 07:02 PM #5
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01-06-2019, 04:20 PM #6
Re: Diode in series with AC coil
It was a rectifier and the drawing wasn't quite right. And was told a DC coil had to be used due to the size of the contactor to keep it held in.
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01-06-2019, 11:55 PM #7
Re: Diode in series with AC coil
Thanks for the update Sean, always good to find an answer.
Brian - Newton Abbot, Devon, UK
Retired March 2015