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Could it be that the ssr´s are on/closed when starting the board?Yes, the outputs are isolated switches (0 to 36V, 0 to 2A)
So you can use 5V or 12V or 24V or anything between 0 and 36V
Note that the outputs are not protected against shorted loads
so use a fused or current limited supply. Also the switches
are polarized (if you connect them backwards they will appear
to be always on)
I should add, you can use an Ohmmeter to test the outputs.
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