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Question
knuth 28
This is the challenge: An electric heating cable has three connections (L1, L2, and N). Applying AC voltage to L1-N gives one power output, applying voltage to L2-N gives another, lower output. Voltage should not be applied to L1 and L2 simultaneously. Connecting this cable to a double switch is simple: L1 goes to the Q1 output, L2 to the Q2, and N obviously to N. There is, however, nothing that keeps me from switching on both channels, which is the "L1+L2" situation I want to avoid. Using a scene, this can easily be avoided by switching one channel off before turning the other one on. I can even hide the two switch devices in the web interface, and use a virtual device in stead with such internal logic built in. I am still concerned that if the fibaro:call(id1, "turnOff") fails to complete (such things happen!) and the subsequent fibaro:call(id2, "turnOn") succeeds, I may end up with the L1+L2 situation anyway.
The question therefore is: Is there any way to configure the double switch in such a way that the two output channels are never engaged at the same time? If not, does anyone know of a z-wave product which works as a selector, not a switch? That is, where input L is connected to output Q1 or Q2 through a toggle function? In that case I could use that for my two L connections, and have a single switch in series to switch the whole thing off.
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