Hoping someone can help me out on my first pcb project please. Just got started learning about Arduino and as in lockdown boredom got right into it, learned basic schematic and pcb design on EasyEDA and loads of other things right back to school and Ohms Law again. Been stumped a few times and found the solutions, but I cannot for the life of me find an answer to calculate rc snubber values for arc supressression on my 12v contactor. I think I could work it out if I knew the Henry value for my loads inductance, but all I know is it's a 60 w, 240 mains ac water pump (aquarium type). So I don't know the energy the capacitor needs to absorb. Is it feasible to ballpark this?
Concensus seems to be snubbers are better across the load than the contacts switch. MOV across load is also recommend. 'Standard' snubber combos for mains AC are around 100ohm and 0.1mf, not sure if thats just too much for my setup. I'd guess I could do without a snubber but I'd like to learn anyway since I've come this far and operate good practice. Simplified schematic below.
Any advice (other than you don't know what your doing mate give up) appreciated thanks.
A snubber capacitor will reduce the spikes in your converter design, protecting the transistors and reducing EMI. A snubber circuit limits voltage spikes in power converters. Calculate RC snubber for 240v ac coil relay. In a project I use several 12v dc coil electromechanical relays. I use diodes in parallel to the coil protect them from flyback. I also have one relay with an 240v ac coil. I have learned that I should use an RC snubber in parallel to the coil in stead of a diode (I'm new to electronics).
I have a 24 VAC Contactor that I want to drive with a microcontroller through a photmos. How do I calculate the proper size resistor and capacitor for a snubber circuit? Here are some of the specifics. Thank you for your help!
Microcontroller - 5V DC 40 mA max on the output pin.
AQV252G Photomos http://www.futureelectronics.com/en/technologies/electromechanical/relays/solid-state-relays/Pages/9530346-AQV252G.aspx?IM=0
Transformer Data - 24 VAC 40 VA Transformer
Ac Rc Snubber Calculator Online
Contactor Data
Contactor Nominal Coil Voltage 24
Maximum Pickup Volts 18
Ac Rc Snubber Calculator For Sale
Drop-Out Volts Range 6 - 15
Nominal Inrush VA @ 60 Hz 20
Ac Rc Snubber Calculator Free
Nominal Sealed VA @ 60 Hz 5.25
Ac Rc Snubber Calculator Download
Ac Rc Snubber Calculator Download
Nominal DC Resistance - Ohms ± 10% 16.5