I have garage door opener which I want to use to control external light during closing or opening. This is how my output looks like at door motor:

Door opener outputs

In order to achieve light control I have remote switch in my light and remote relay connected to motor. Now the question is when to detect if door is opening or closing. For this purpose I can use Flash output( as a trigger signal) which is supposed to be used by blinking alarm light. But the thing is I don't want my external light to blink but to being turned on constantly.

To solve this problem I've decided to use this time relay which will convert blinking signal to constant one. According to this picture as a trigger signal I can connect anything +/-, L/N

time relay

So I set proper mode which is: enter image description here

And connected everything as follows: enter image description here

But it doesn't work. I was playing with this relay a bit and it turned out that it is not triggering when I connect red line to +24V but it does when I connect it to the GND

What am I doing wrong?

Why rising or trailing edge is working with ground and not positive?


Manual in english for similar relay - 230V AC only instead of 24V AC/DC

This is connection diagram from manual: enter image description here


1 Answer 1


The problem is that probably the input is looking for a connection toward ground (a current sink), while the flash output is only capable of sourcing current.

In normal usage how is the flash lamp connected? Flash and GND or Flash and +24?

Also, I have not found a cabling manual for your relay so I cannot really say. It could be simply designed to work that way.

  • \$\begingroup\$ Flash should be connected to GND. I've attached link to manual and diagram. \$\endgroup\$
    – nervosol
    Feb 9, 2021 at 16:59

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