Separate inclusion of fans from one power supply
Lighting in the country. There are 7 LED arrays of 50 watts each from 220 V. I placed them on 7 different radiators, on the reverse side of which there are 12V cooling fans that are powered by ONE power supply taken from a computer. Each matrix will illuminate different areas. Each matrix will have its own switch.
Question: How to make sure that with the power supply turned on, the fans do not work all at once. And would only that fan turn on, one or several, which is necessary to cool the matrix, to which voltage would be supplied?
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If the voltage is different, then using one switch to apply voltage will not work. The only option is to put separate switches to turn on each cooling fan (or several fans). But in this case, it is highly likely that they may forget to turn on the cooling and the LED matrix will fail. Another option, but more complex and costly, is the use of intermediate relays. The relay control coil must be rated for 220 V, it is included in the power supply circuit of the LED matrix. And thus, when one of the LED arrays is turned on, the supply voltage is supplied to the relay control coil, which in turn closes a pair of contacts - this pair of contacts will close the power supply circuit of the corresponding cooling fan.