Features
ENIP-2, manual, ENIP.411187.002. Rev. 11.2020
15
3
Features
3.1
General information
Analog current and voltage inputs are converted into analog voltage signals of lower
scale. These signals go to ADC. ADC performs analog-to digital conversion of instantane-
ous values of measured signals (40 measures per each period of industrial frequency
(50/60 Hz)). Measuring data is further passed on to microcontroller (MCU).
ENIP-2 struc-
ture scheme is illustrated in fig. 3.1.
MCU performs:
•
Electrical grid parameters calculation (using 50 ms
“
sliding window
”
measurement
calculation method)
–
instant measurements;
•
Averaging of both measured and calculated parameters through
“
sliding window
”
method (possible averaging time is 200, 500, 1000, 1500, 2000 ms)
–
averaged meas-
urements;
•
Processing digital I/O;
•
Data exchange with extension systems through the following protocols: Modbus
RTU, Modbus TCP, IEC 60870-5-104, IEC 60870-5-101, SNTP, SNMP, IEC 61850-8.1 (IEC
61850-8.1 is optional and is sold separately as an add-on).
Galvanic isolation of RS-485 interface is accomplished through interface converters IC1,
IC2, IC3. Built-in functionality of an MCU makes Ethernet port available for use as well.
Real-time clock support is also brought about by MCU.
ENIP-2 might be used for different connections (3- or 4-wire electrical grid, with or with-
out transformers). All wiring diagrams see in Appendix A1.
You can choose the current range needed using
«
ES Configurator
»
.
Current range
(% of nominal)
Description
1…200%
It’s recommended
range. For maximal accuracy ENIP-2 measure in two ranges -
1…70%
and
70…200%.
Switching between ranges is accompanied by a delay about
200 ms.
2…200%
Fast range. Measurement is provided without switching.
8…800%
Fault current range. Accuracy for low current is does not match the stated accuracy.
