Not sure where you read that 2x 320mA, as long as you don’t use the secondary auxiliary output, it can output 640mA to the bus.
It’s a pity you bought a power supply without diagnosis feature, as this would measure the real usage of the devices.
This is what ABB writes:
We advise that you ensure your installation complies with the recommendations of the KNX Association and the
• Use only one KNX power supply per KNX line.
• If the number of KNX devices exceeds the capacity of a KNX power supply, replace the supply with one that has a
higher rated current or expand your KNX system with an additional KNX line that has its own KNX power supply.
Generally speaking, up to two ABB i-bus® KNX power supplies may be switched in parallel on one KNX line. In such cases, the
rated current of the ABB i-bus® KNX power supplies in use does not matter. In other words, two different ABB i-bus® KNX power
supplies may be switched in parallel. No minimum spacing is required during installation.
Please note (applies to all KNX manufacturers) that parallel switching reduces the overall impedance of a line regardless of rated
current. Switching more than two KNX power supplies in parallel also significantly reduces the transmission range of the KNX
- This reply was modified 8 months, 1 week ago by sinn3r.