Power management MLR003R – 11
6 Power management MLR003R
6.1 Energy Harvesting
The actuator obtains the electrical energy required for operation by means of a thermoelectric generator
(TEG), from the temperature difference between the heating flow temperature and the room
temperature. During active flow temperatures, excess energy is accumulated in the internal storage. The
energy balance of the actuator is designed to allow operation through 366 days per year when used in
typical circulation strands with hot water supply throughout the year. A lack of hot water operation as it
occurs in down times or malfunctions inevitably leads to the internal storage being discharged, which
means that permanent and normal operation of the device can no longer be guaranteed.
6.1.1 Device power management
MLR003RiEU61-07-1.1 allows the end user application to monitor and compute the energy status through
regular measurement of the device internal parameters. Internal storage voltage STV (V) and average
current generated ACG (µA) are actual measured values whereas average current consumed ACC (µA) is a
computed value. The computed average current consumed value includes motor amount and direction
of movement, radio communication frequency, and sleep current. The following two diagrams are
illustrations of the energy balance from a running application.
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