admin avatar

 KNX Energy Monitoring


KNX Energy Monitoring is made simple through various products available in market. The KNX Energy Meter can an energy saver of electrical energy for single-phase or three-phase systems. 

It can measure and notify in KNX system, not only the consumed or produced energy, but also the associated cost according to different tariffs, CO2 emissions, instant active and reactive power, power factor and other information related with the use of electric energy in the installation. 

KNX energy meters are used to measure the consumption of electrical energy within a building. They can provide real-time data on energy usage, helping building managers and homeowners make informed decisions about energy efficiency.

In commercial settings, energy monitoring in KNX can be used for accurate billing and allocation of energy costs among different tenants or departments based on their actual consumption.

Energy monitoring data can be used for in-depth analysis of energy consumption patterns. This information can help identify areas where energy is being wasted and guide decisions to improve energy efficiency.

Alarms and notifications can be configured as warnings when power exceeds the limits established, for example, to disconnect low priority systems to reduce consumption.

The data collected is typically visualized on user interfaces, such as touch panels, smartphones, or computer applications. Users can view real-time energy consumption, historical data, and trends.


KNX Energy Meter have below common functions.

  • Support for frequencies of 50 and 60 Hz. 
  • Support for single-phase and three-phase systems. 
  • 3 independent input channels to monitor up to three independent singlephase lines or one three-phase line. Power and energy, cost and CO2 emissions measurement in up to 3 registers (one total and two partial). 
  • Up to 6 tariff counters for the estimation of the cost of energy consumption. 4 Alarms for power excess and low power. 
  • Up to 15 notifications of different situations: overvoltage, low voltage, excess of consumption, energy generation, economic cost, CO2 emissions.
  •  Synchronization with an external KNX clock. 10 customizable, multi-operation logic functions. Heartbeat or periodic “still-alive” notification.
KNX Energy Meter

Phase/line (voltage) (1): inputs for the Phase/line connection. Neutral (voltage) (2): inputs for the Neutral connection. Programming Button (3): a short press on this button sets the device into the programming mode, making the associated LED (4) light in red. 
Current Transformer connection (6): inputs for the current transformers connection. A different transformer will be required per electrical line being monitored. The two wires of each transformer will be inserted into the two connection points of the particular input channel to be used. For instance, if three electrical lines are going to be monitored, one transformer will need to be connected to the slots CT1 +/- (referred to as “Phase 1” in the Single Phase application program), another one to the slots CT12 +/- (“Phase 2”), and a third one to the slots CT3 +/- (“Phase 3”). In the case of the Three Phase version, each transformer will be destined to monitor one of the three phase lines in the electrical system.

Three-phase installation with accessible neutral wire and three-phase load

KNX Energy Meter Wiring Connection


KNX Energy Meter ETS Programming

KNX Energy Monitoring ETS Settings

  • Voltage (T/S): rms value expressed in millivolts [mV] or volts [V]. 
  • Current (T/S): rms value expressed in milliamps [mA] or amps [A]. 
  • Active Power (S): effective power capable of transforming electrical energy into work. Measured in watts [W] or kilowatts [kW], as selected by parameter, with 2W-resolution. The sign of this magnitude indicates whether the power is being consumed or generated: ➢ Active Power > 0 → Active power consumed (the receptor is a load, absorbing power from the electricity grid). ➢ Active Power < 0 → Active power generated (the receptor is a generator, injecting power to the electricity grid). 
  • Power Factor (S): relation between active and apparent power (dimensionless). 
  • Active Energy (S): time integration of the active power. It is disaggregated in two objects, active energy consumed and active energy generated (always positive values). Measured in watts per hour [W·h] or kilowatts per hour [kW·h], as selected by parameter. Global magnitudes: 
  • Frequency (T/S): weighted average of the frequencies of each phase connected. Measured in hertz [Hz]. Consumed Active Power (S): Sum of the consumed active power of each phase. Resolution: 8W
  • Frequency (T/S): weighted average of the frequencies of each phase connected. Measured in hertz [Hz]. 
  • Consumed Active Power (S): Sum of the consumed active power of each phase. Resolution: 8W
admin avatar