Components not working anymore (MDT and Ekinex)

[Jasper298]

Hi all,

Since 2 years, I am running a KNX system at home without any problems untill yesterday evening. My MDT AKS-2016.03 stopped working. The KNX connection seems to work fine because when I switch a light on/off the LED on the unit is still working but NONE of the activated relays are working. Even when I try to switch the relays by hand....

Also my Touch and See interface from Ekinex stopped working.... It seems to stuck in a reboot and this problem started 2 days before.

Anyone have had the same problems?

[Uwe!]

Did you check the voltage on the bus? Could be to low for activating the relays but still enough for the electronic to work. Should be around 30V.

[Jasper298]

Thank you, That is a good option. Will check that tonight.. My psu is the MDT STR-0640.01
One remark, all my 4 AKD-0401 dimmers are working properly.

[Gast1961]

In the past, we had quite a few cases here where some (not all) actuators showed strange effects -> low bus voltage due to defective supply (often MDT 640mA).

[Jasper298]

Yes, it is the psu. I am using the STR 0640. and both outputs deliver 21 volts. way too low.

[hjk]

Pls contact your dealer or our support directly, PS will be changed fast by pre-exchange.