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Tkbhome TZ78 behind a two-way switch not working

Posted: Thursday 02 May 2019 11:10
by tonbor
I got a two-way switch (hotelschakelaar). Put a Tkbhome Tz78 behind the right switch. Connected tz78 to power en neutral. The black wire to the bulb into n01 and from orignal switch the black wire to S. So that should Work. Z-wave works :D

Unfortunaly the Tz78 gets from both switches a double signal as one is turned on. So just a blink from the led, if I disconnect one of the two way black wires and it acts like an one way switch, I can put the light on and off. Somebody got a solution for this?
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Screenshot_20190502-105635_Chrome_20190502111556314.jpg (122.45 KiB) Viewed 1355 times

Re: Tkbhome TZ78 behind a two-way switch not working

Posted: Tuesday 07 May 2019 14:44
by tonbor
By the way seller send me a old 300 model of the Tz78 not the plus, so be warned.....

Re: Tkbhome TZ78 behind a two-way switch not working

Posted: Wednesday 29 May 2019 3:22
by fargle
This is a problem I saw with the TZ74s. The hardware switch inputs are way too sensitive and will trigger on noise if the switch wiring is more than a few cm long. Not fixable. I stopped using them for that reason. They also have a habit of locking up....spend a little more cash and buy something decent.

Re: Tkbhome TZ78 behind a two-way switch not working

Posted: Wednesday 29 May 2019 12:22
by xuter010
fargle wrote: Wednesday 29 May 2019 3:22 This is a problem I saw with the TZ74s. The hardware switch inputs are way too sensitive and will trigger on noise if the switch wiring is more than a few cm long. Not fixable. I stopped using them for that reason. They also have a habit of locking up....spend a little more cash and buy something decent.
uhhhhh.. i have a few TZ74s switches, i have no problem with them "hardware switch inputs are way too sensitive" the wall switches that are connected are like 15a20mtr far...

Re: Tkbhome TZ78 behind a two-way switch not working

Posted: Thursday 25 July 2019 17:35
by fargle
Fwiw, after suffering intermittent power ons and offs when used in a 2-way switch config where one of the switches was located around 15m from the node, I removed one TZ74 device. While bench testing it, I found that the relays could be energized just by touching between the Live and the Switch input terminals with my Fluke meter. Checked another device, same thing. This should not be happening and points to a high impedance/high sensitivity issue on the switch sensing inputs. Induced voltages in long switch cable runs makes them prone to false triggering. Replaced the offenders with Enerwave switches that don't have this problem. Still use the TBK devices as Repeaters or where external switches are not needed. I have a mixture of Aeotec, Qubino, and Enerwave switches and haven't come across this problem with any of those....could be just this model with this issue, but I won't be buying any more of them.

Re: Tkbhome TZ78 behind a two-way switch not working

Posted: Monday 04 November 2019 22:26
by solarboy
My TKB often stops responding to commands and requires an exclude/include despite being close to many other routing slaves. I wouldn't recommend either.