http://www.hilaryquebec.org/capacitors-nos/
Electrical circuit– contactor logic?
I have made a circuit where the contactor relay coils + timers are operated at 220VAC. These contactor relays + timer switch the load ON and OFF with the help of push buttons(the load is a solenoid,24VDC, 5 nos). I have used a SMPS(input voltage:220VAC and output 24VDC) for the solenoid supply. I have connected a 2200mfarad capacitor across the SMPS terminals. Will there be any back EMF when I switch ON and OFF the contactor relays? Please help..
Is it advisable to connect the capacitor across each solenoid or across the 24VDC+ and 24VDC- on the SMPS??
I have used 2200mF capacitor 40V.. Have I used the right rating capacitor across the SMPS?
The counter EMF is created by the collapsing magnetic field of the coil in the solenoid. So yes, there will be a counter EMF in your circuit. In the DC side of the circuit it is most often controlled one of three ways. Putting a Resistive-Capacitive) RC network, a clamping diode, or a varistor across the load. It is best to place the protective circuit close to the load (solenoid). The clamping diode forward circuit rating must be equal to or greater than the load current. Diode PIV rating must be three or four times greater than the supply voltage at 24 VDC The unpolarized (AC) snubber capacitor should have a rating two or three times greater than the supply voltage. The capacitor value may be: 0.5 mF for a load inductance of 25-70mH, or 25 mF for a load inductance of 70-180 mH. Snubber resistors may be 1-3 ohm, 2W. Resistor values should be increased up to 47 ohm, .5W for R-load exceeding 100ohm.
Added: The function of a capacitor across the output of the power supply will flatten out any ripple in the output of the DC power supply. It will do little for any counter EMF from the solenoid because the time constant for the charging of that big of capacitor would be to long to be much use.
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