Hi,
Calling out local knx experts.. @Udo_Hartmann
I know its not related to OH, but I dont have any clue about good knx forum in english, so this is my safe place to cry for help
I have tried posting on schneider-electric knx forum, but that is not very active and very very slow (each post and reply has to be moderator approved and it takes days).
The only reply I managed to get is that my PSU might be failing, so devices are running out of power/misbehaving. They advised me to measure the voltage, which I did and got 30.3VDC stable voltage on the bus. So i guess its not that.
Here is the issue:
in my condo i have the following knx setup:
1X Merten actuator (7 lights), 1X Merten dimmer (4 lights), 2X Woertz Fan Coil Actuator (HVAC), 3X SchneiderElectric Wall Controller Pushbutton MTN6214-4146 (8 buttons), 7X SchneiderElectric Wall Controller Pushbutton MTN6212-4060 (6 buttons), 1X Merten PowerSupply 160mA. On top of the originally built setup, I add ESYLUX USB KNX gateway.
Recently two MTN6212 wall controllers stopped working with the following behavior:
Once I press any button, the blue status led switches off for random amount of time, nothing happens with the lights. Sometimes if i press the button again, the status led goes back on. But sometimes status led is dead. Then if I use another wall pushbutton that controls the same lights, then the faulty one’s status led goes back on. When light is switched on via another pushbutton or via mobile phone, the “dead” controllers show the status of the corresponding light as on. and off when light is off’ed via phone. so they are fine as read-only status panel to see what is off what is on, as long as you dont touch them.
Now, on top of that, some 2 other pushbutton controllers become unresponsive and slow. Takes them 2-5 seconds to switch on the light. If I power cycle the knx system via the power breaker, it kinda improves for a while.
On other controllers it works fine (instant). also software control (via usb knx gateway running knxd and openhab) works instant.
I got a suggestion to check PSU. I measured 30.3VDC on multiple points on the bus just to be sure. Seems stable. anything between 29-31V should be fine?
My PSU is 160mA, should I go for 320mA to be on the safe side?
In case one day I decide to replace my 10 pushbuttons with some more modern touchscreens I assume they will draw more power?
What could be the cause of these issues? is it possible that SE pushbuttons are dying one by one? what is the expected lifespan? these are about 15 years old. Openhab has been controlling the setup with no such issues for the last 5 years.
Maybe the faulty pushbutton causes havoc on the bus and makes other pushbuttons unresponsive/slow sometimes?
Anyone seen such behaviour?
TIA