WAGO-I/O-SYSTEM 750
Function Description
35
750-493 3-Phase Power Measurement Module
Manual
Version 1.2.0
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5
Function Description
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5.1
Measuring Principle
The 3-phase power measurement module operates using 6 analog/digital
converters for acquiring the current and voltage levels in all three phases. The 3
phases are connected to the current measuring channels of the I/O module in
"single-ended" measurement topology. Each of the 6 measurement inputs is
scanned at a frequency of 8 kHz. The input filters on the measuring channels have
a limit frequency of 7.2 kHz. The analog measured values are quantized with 24
bits and further processed digitally.
Acquisition and processing of the measured values of all three phases is
performed simultaneously in the very same way.
5.2
Measured Values and Measured Value Calculation
The 3-phase power measurement module makes the following
AC measured
values
available per phase (Lx = L1, L2 or L3):
Voltage:
•
RMS value voltage Lx – N
•
Maximum RMS value voltage Lx – N
•
Minimum RMS value voltage Lx – N
Current:
•
RMS value current Lx
•
Maximum RMS value current Lx
•
Minimum RMS value current Lx
Power:
•
Active power Lx
•
Maximum value active power Lx
•
Minimum value active power Lx
Energy:
•
Active energy Lx
Frequency:
•
Supply network frequency Lx
Power factor:
•
cos phi Lx
Limit value:
•
Undervoltage Lx: Threshold value undershot
Alternatively, the following
DC measured values
are available if DC
measurement has been activated in the I/O module. See section "Commissioning"
> "Configuration with WAGO-I/O-
CHECK
".
Voltage:
•
DC voltage Lx – N
Current:
•
DC current Lx
Power:
•
Power (DC current) Lx