I hope this thread is allowed. Based upon my previous topic, which turned out to be the exact opposite of what I needed to accomplish, I have a few questions.
I have a 240W 24V Supply: https://www.us.tdk-lambda.com/ftp/Specs/dpp120-240.pdf
I have a coil with a 750W turn on rating and a 5W hold in rating: http://www.kvc.com.my/EnterpriseChannel/SharedResources/Datasheet/0/?ProductId=1000066755&Filename=SCHNEIDER-LX4-FH024.pdf
The device will also be used for some sensitive equipment, so I want to be safe and not allow too much voltage fluctuation.
50ms (closing time) * 30A= 1.5C (Thanks @DaveTweed) To be safe, 1.5C/4V= 375,000uF
What voltage rating? I've read to derate 2-3x.. for a .4F 50V cap and above, I'm looking at $1-200 per capacitor. Am I playing it way too safe with these numbers, or is this really what I need?
Ok, so if my above power supply uses a forward folding method of current limiting, do I need to use a resistor/thermistor to ensure the capacitor itself doesn't overdraw my supply after it's emptied? I will probably have at minimum a minute of time for the cap to recharge.
As far as wiring, since there are other items in my circuit, I want the capacitor in parallel with my coil rather than directly off my supply, correct? If I were to need a thermistor/resistor would that be in series with the + side of the coil, prior to the capacitor?