FEATURE
POWER
ANALYSING BACKFEEDING OF POWER SUPPLY DATA
Backfeeding is a physical process that is highly desirable in
many applications, such as electric vehicles, for the purpose of energy recovery. However, in an industrial setting, it can present a problem. Here, PULS explains how to get real application data for backfeeding events with the help of a power supply unit
form of voltage to the output of the power supply. On its output side, the power supply can absorb a certain amount of this energy in its output capacitors. At the same time, the output voltage increases accordingly. The resistance to backfeeding events describes the maximum voltage allowed at the output of the power supply. If this figure is exceeded, the power supply will switch off and the system or machine will shut down. However, even plant operators are often not aware of the backfeeding figures in real operating conditions. There is a lack of specific data concerning the frequency and the maximum values. A detailed real-life load profile is helpful when choosing a suitable power supply during the planning phase and when analysing faults in the operating phase. The question is: How can this data be obtained?
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THE POWER SUPPLY AS A DATA SOURCE PULS has developed the FIEPOS family of power supplies for decentralised use and has integrated the option of application analysis. The power supply functions like a sensor.
It records a variety of application-related parameters (for example, voltage, current, temperature) and makes them available in real-time. As the decentralised power supply is on the field level, PULS logically uses an IO-Link interface for communicating these data. Therefore, the FIEPOS power supplies function as reliable data sources and make the perfect complement to the existing condition monitoring systems. The following practical example clearly demonstrates the value that this data can add.
APPLICATION ANALYSIS WITH THE HELP OF THE POWER SUPPLY A manufacturer of intralogistics solutions planned to replace its existing 24 V power supply with a different decentralised solution. The power supply that was currently in use was constantly causing system shutdowns and it had not been possible to identify the cause. PULS advised the company about the possible solutions, and made available a sample of the three-phase 360 W FPT300 power supply. With
38 DESIGN SOLUTIONS APRIL 2025
otating machine components, such as drum motors, store kinetic energy which they feed back during braking in the
Figure 1: Load profile in normal operation
Figure 2: Load profile for parallel operation of running and braking motors
Figure 3: Load profile for an emergency stop situation
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