Figure 7: Rms Value Calculation (Example, Not To Scale) - WAGO 750-494 Series Manual

WAGO-I/O-SYSTEM 750
750-494 3-Phase Power Measurement Module
N: No. of sampling values

Figure 7: RMS Value Calculation (Example, Not to Scale)

The current and voltage RMS values are calculated for each period in the I/O
module. The RMS values can be exported with every second period (2 T) with the
specified measuring accuracy via the process image. In a 50Hz-network this
corresponds to an update rate of 40 ms.
The arithmetic mean value for phase current and voltage is generated on the
basis of the RMS values. You can set the time period during which the mean
value is to be generated using WAGO-I/O-CHECK, or parameters 34, 35, 36. The
RMS minimum and maximum values for current and voltage are also determined
over a configurable time period (WAGO-I/O-CHECK or parameters 37, 38, 39).
Peak current and voltage values can also be recorded, but for only one
selectable phase. The specified observation interval for this can be set using the
number of half-waves (WAGO-I/O-CHECK or registers 43, 44, 45).
Calculation of phase-to-phase voltages is performed on the basis of the phase
voltages and the corresponding phase angles.
Manual
Version 1.2.0
Function Description 33