Read: 298 times
|#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?
|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|