To make the best use of the connectable devices set to "Decentral bus power supply = Off" and the devices without a bus power supply, it is necessary to calculate the current requirement from the KNX bus.
Power consumption for Synco devices with "Bus power supply unit = Off".
| RMU7x0, RMU7x0B universal controllers | 5 mA |
| RMH760, RMH760B heating controllers | 5 mA |
| RMK770 boiler sequence controller | 5 mA |
| RMB795, RMB795B central control units | 5 mA |
| RMS705, RMS705B switching & monitoring devices | 5 mA |
| OZW775 central communication unit | 5 mA |
| QAX9x3 central apartment unit | 5 mA |
Power consumption values for Synco devices without a bus power supply unit:
| QAWZ40 room unit | 7.5 mA |
| RXB/RXL room controllers | 5 mA |
RMZ792 bus operator unit - without external supply - with external AC 24 V supply |
: |
| 45 mA | |
| 5 mA | |
| OZW771.xx central communication units | 5 mA |
| OZW772.xx web server | 5 mA |
| VAV controller GxB181.1E/KN | 5 mA |
| Room thermostats RDF, RDG, RDU | 20 mA |
| Room thermostat RDF600KN | 5 mA |
| Flush-mounted sensor AQR2570 | 5 mA |
| Flush-mounted sensor AQR2576 | 15 mA |
| Room units QMX3.P02, 30, 34 | 7.5 mA |
| Room units QMX3.P37 | 10 mA |
| Room units QMX3.70, 74 | 15 mA |
Power consumption values for service interface, coupler and IP router:
| OCI700 service interface | 5 mA |
Area/line coupler N140/x13 - Primary line (main line) - Secondary line (sub-line) |
: |
| 6 mA | |
| 8 mA | |
| IP router N146 from bus 1) | 10 mA |
1) The Siemens IP router N146 consumes 10 mA from the KNX bus despite the additional external auxiliary voltage AC/DC 24 V. Power consumption with auxiliary voltage: 25 mA at DC 24 V, max. 800 mW.