Fibaro Dimmer 2 and light goes off after less than 1 asecond

[Alex 32]

I have one problem:
I tried to install the new dimmer 2.

Everything worked fine so far (inclusion, automatic detection).

I have two momentary switches. If I use one of them controlling light works fine.

I am having two light in a row (two lamps at different positions).

 

The dimmer 2 module is connected to L, N. The output of switch 1 is connected to S1 (the other switch is connected to the first switch via

Light 1 is connected to O, than to the second light and back to neutral.

(So phase is connected to L of the module and input to the switches, neutral lead to N and end of second light, output of switch is connected to S1 and this "O" from the module is connected to the first light)

 

 

Now the problem:

If I switch on the lights via app or web page it goes on to the dimming value I want.  but only for very short time (less than a second).

So it switches off directly.

If I repeat this it happens again. But after the third or fourth time the light stays on.

After switching it off again and waiting for a minute (I have not measured this) I can reproduce this behaviour.

 

 

What have I done wrong?

Any more details needed?

[Martin_N 154]

@Fire69

Hi.

If you look at the Dimmer specification, you will find that the recommended load is 50-250W or 50-200(220) VA. The minimum is 5VA when using bypass.

So, as the device ages over time, its parameters change. You could have run the system on the edge when it still worked. Now the values have shifted somewhere.

1) use a larger load (you can dim it)

2) use bypass

[Fire69 0]

15 hours ago, Martin_N said:

@Fire69

Hi.

If you look at the Dimmer specification, you will find that the recommended load is 50-250W or 50-200(220) VA. The minimum is 5VA when using bypass.

So, as the device ages over time, its parameters change. You could have run the system on the edge when it still worked. Now the values have shifted somewhere.

1) use a larger load (you can dim it)

2) use bypass

 

Thanks for the info!

 

I'll see if I can find some decent 10W GU10's, otherwise I'll install the bypass.

[Moroxiken 1]

I have found this problem of long cables to momentary switches causing spurious actions, not just with Dimmer 2 but with some switches. As petergebruers has suggested. I tried 22nf capacitors between S1 and Sx, and physically moving cabling but I discovered that the problem is worse when there are multiple unterminated cables all connected as you would connect momentary switches in parallel. That would suggest the problem could be improved by connecting some sort of snubber at the unterminated end, perhaps just a 22nf capacitor, or a 22nf + small resister (to damp parasitic oscillations), say 1k in series, at the switch end. However, by chance I discovered that if there is only one long cable, changing the parameter 26 to enable three-way switching, and connecting the long cable to S2 instead of S1 will solve the problem in my environment, without needing relays, or capacitors sitting inside wall boxes.