WAGO I/O System 750 XTR
Function Description 43
750-495/040-010 3-Phase POM 20KV 300A XTR
Manual
Version 1.0.0
Rotary Field Detection
The zero crossings of the voltage characteristics for the 3 phases are monitored
by rotary field detection. The direction of rotation of a device can only be
determined when the phase sequence L1–L2–L3 at the I/O module has been
connected the same way as at the device and when the device corresponds to
the guidelines of VDE 0530-8 or DIN EN 60034-8 with regard to “Terminal
designations and direction of rotation.” Phase sequence L1–L2–L3 signals
clockwise rotation; a reversed phase sequence signals counterclockwise rotation.
Caution: It is not possible to detect double reversing.
Threshold Values
The I/O module offers the option of threshold value monitoring. Thresholds for
undervoltage, overvoltage and overcurrent can be set for each phase (WAGO-
I/O-
CHECK
or registers 36, 37 and 38 and parameters 12, 13, 14 and 23 … 31).
Signaling is carried out in the process image (PI).
Pos: 59.2 /Serie 750 (WAGO I/O SYSTEM)/Funktionsbeschreibung/Funktionsbeschreibung 750-0495/040-010 - Messfehler @ 35\mod_1561046831647_21.docx @ 548631 @ 2 @ 1
4.4
Measurement Errors
The measurement accuracy of the I/O module is described in section “Device
Description” > “Technical Data.” However, the values indicated only apply if the
following conditions are met:
1.
The measurement signals must be within the permitted limits.
The ZC limit (zero crossing limit) is 1.906 kV
RMS
. If the voltage signal is
below the ZC limit, no measurement of frequency, phase angle, cos phi, PF
power factor or LF power factor is possible. The I/O module then outputs
the measured value 0 for these variables.
A ZC limit underrun is signaled by the “D” LED.
Input overloading occurs at or above 120
% of the nominal input signals for
voltage and current. The measurement errors increase by 0.10
% for the
voltage and current and by 0.2
% for the power.
Figure 10: Input Limiting (Clipping)