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Mahmood Elnasser
02/09/17 21:27
Read: 727 times
Sacramento
USA


 
#190732 - Relay noise
I noticed a relay driving ac contactor coil (inductive load) resetting the FPGA when energizing relay. there is RC snubber circuit across the coil. Problem disappeared when putting snubber circuit across relay contacts 0.1uF capacitor in series with 47 Ohm resistor. Although this solved the problem but it introduced another problem since the relay passes AC voltage, the snubber circuit gives path to ac voltage when relay is not energized driving small loads.
Out of interest I covered the FPGA with grounded foil tape and problem disappeared even without snubber circuit.
Any ideas or suggestions?
Mahmood

List of 13 messages in thread
TopicAuthorDate
Relay noise      Mahmood Elnasser      02/09/17 21:27      
   metal box      Stefan KAnev      02/11/17 02:32      
      not possible      Mahmood Elnasser      02/12/17 12:30      
   Are the output leads,inside the relay,...      Kerim Fahme      02/13/17 10:28      
      FG Relays      Mahmood Elnasser      02/16/17 16:31      
   can you ....      Erik Malund      02/14/17 07:03      
      not piggies      Erik Malund      02/14/17 10:55      
         LCD Shield      Mahmood Elnasser      02/16/17 16:42      
            no scientific base      Erik Malund      02/17/17 07:09      
   Avoid Relay noise addin a zener !      KONSTANTINOS L. ANGELIS      03/06/17 14:25      
      Source of noise      Mahmood Elnasser      03/07/17 09:38      
         Relay noise, add a zener with the flywheel diode      KONSTANTINOS L. ANGELIS      03/07/17 12:05      
            Experimentation      Mahmood Elnasser      03/08/17 00:30      

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