110 Connect Devices
WAGO-I/O-SYSTEM 750 XTR
750-495/040-00x 3-Phase Power Measurement Module 690 V
Manual
Version 1.2.0
7.6.1.2 Measurement in Grounded Single-Phase Networks
For voltage measurement, set the topology to “4-Wire Wye” (“4-W”) in WAGO-
I/O-
Check
versions IO-3.18.1 (CS0609) and above and firmware versions 05 and
above.
This topology is fixed in firmware versions 04 and below.
The measurement circuit basically corresponds to the “Grounded 3-Phase
Network with Neutral Conductor for Power Measurement and Voltage
Measurement on 3 Line Conductors for U
LN
≤
400 V
RMS
” connection schematic,
except that only connections L1 and
N and connections I1+ and I1− are
connected.
Voltage measurement is performed directly.
The current measurement is performed via current transformers (CTs) or
Rogowski Coils.
The measured values of unconnected voltage and current measurement inputs
have no significance.
The current transformer ratio must be taken into account for the correct
calculation of all values in the process image.
The nominal input voltage is:
- U
LN
= 200 V
RMS
if a voltage ≤
120 V
RMS
is parameterized for the “Secondary
Voltage” setting
- U
LN
= 400 V
RMS
if a voltage > 120 V
RMS
is parameterized for the “Secondary
Voltage” setting
Parameter 47 is used for the setting.