Intelligent Controller
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9 Appendix A: Selection of KWH Meter & Current
Transformer
Selection scheme 1
KWH meter model: ENTES EPR-04S-96
Parameters of ENTES EPR-04S-96
（1） Measure the 3-phase voltage and electric current. Calculate the forward and
reverse active electricity quantity.
（2） Working voltage: 45-265V AC/DC.
（3） Measuring voltage: 10-300V AC (L-N), 10-500V AC (L-L).
（4） Frequency: 45-65Hz.
（5） Reference current: 0.05-5.5A.
（6） Communication port: RS-485 port.
（7） Communication protocol: Modbus RTU.
Current transformer: comply with the following parameters.
Parameters of Current Transformer.
（1） Rated voltage & frequency: 630V, 50Hz.
（2） Grade of accuracy: 1.
（3） Secondary rated current: 5A.
（4） Rated output load: 5VA.
（5） Rated primary current of current transformer: Select according to table 1.
Please use the current transformer made by a well-known brand with high
reliability.
Table 1: Reference Table of Load and Mutual-Inductance Ratio
Rated capacity of unit (HP) Rated capacity of unit (kW)
Mutual-inductance ratio of current
Selection scheme 2
KWH meter model: Wattnode Modbus WNC-3D-240-MB
Parameters of WNC-3D-240-MB:
（1） Measure the 3-phase voltage and electric current. Calculate the forward and
reverse active electricity quantity.
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