X20 system modules • Analog input modules • X20AP31x1
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X20 system User's Manual 3.10
4.3.14.10.3 General information
The modules are used for power monitoring and for a machine's energy management. Examples of where this
would be used:
•
Multi-phase energy measurement for class 0.5S or class 1 for
°
3-phase, 4-line applications with neutral line (with/without grounding)
°
3-phase, 3-line applications (with/without grounding)
°
2-phase mains networks with grounded phase B connection
°
ARON connection
•
Single-phase measurement by disabling inputs that are not needed
•
Mains analysis according to harmonic content
•
Signal trace by 8 kHz recording of the 3 voltage channels and 4 current channels with FIFO
4.3.14.10.3.1 Measured value preparation
The modules provide the following possibilities for measured value preparation:
•
IEC62052-11, IEC62053-22 and IEC62053-23, ANSI C12.1 and ANSI C12.20: Can be used for class 0.5S
or class 1 multi-phase wattmeter or class 2 multi-phase varmeter
•
Precision of ±0.1% for real energy and ±0.02% for reactive energy over a range of 6000:1
•
Temperature coefficient of internal reference of 6 ppm/°C
•
Each phase can be calibrated for the active power
•
Calibration not required for reactive power and apparent power
•
Error ≤±0.5% for voltage, current, active-, reactive-, apparent power, frequency active power factor and
phase angle
•
Energy registers for active, reactive and apparent energy, separated for forward and backward, fundamen-
tal waves and harmonics
•
Threshold register for status signal generation and activation of power and energy measurement
•
Determining the THD harmonic component
•
Discrete Fourier Transformation (DFT) up to 31st harmonic component per phase for voltage and current
•
Status signals for voltage dip, loss of voltage, phase sequence, energy flow, neutral current monitor, har-
monic component monitor
4.3.14.10.3.2 Additional information
Information
Description
Measurement range monitoring
Due to the majority of registers consisting of 16 bit values (exception: energy registers, which are interpolated
to 32 bit by the FW), the measurement ranges are subject to limitations, e.g. voltage 650.00 Vrms and current
65,000 Arms (after accounting for the transfer factor of the current transformer).
Extended measurement ranges
Extended measurement ranges can be achieved with the software application by upscaling the measured values.
Frozen values
Sample time register:
A NetTime is assigned to the group of measured values when read from the power meter. This NetTime can be
used to determine if the values have been frozen.
Environment variables
The values for duty cycle, boot counter, and minimum / maximum transformer temperature are recorded.
4.3.14.10.3.3 Measurement function
The values measured for RMS, power, active power factor, phase angle and frequency are mean values over
16 full waves, the update rate is ~3 Hz.
The following represents the measurement time over 16 full waves at the corresponding frequency:
50 Hz ... 320 ms
60 Hz ... 267 ms
