Yokogawa PR300 Power and Energy Meter - Manual (Page 6)

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IM 77C01E01-10E
CONTENTS
Model PR300 Power and Energy Meter
Communication Interface
(RS-485 and Ethernet Communications) IM 77C01E01-10E 4th Edition
Introduction ........................................................................................................... i
Documentation Conventions ...............................................................................ii
Notices .................................................................................................................iii
1. Communications Overview
1.1 RS-485 Communication Specifications ......................................................... 1-1
1.2 Ethernet Communication Specifications ....................................................... 1-1
2. Setup
2.1 Setup Procedure ............................................................................................. 2-1
2.1.1 Procedure for RS-485 Communication ............................................. 2-2
2.1.2 Procedure for Ethernet Communication ............................................ 2-3
2.1.3 Procedure for Ethernet-Serial Gateway Function .............................. 2-4
2.2 Setting Communication Conditions .............................................................. 2-6
2.2.1
Conditions for RS-485 Communication ............................................. 2-6
2.2.2 Conditions for Ethernet Communication ............................................ 2-8
2.2.3 Conditions for Ethernet-Serial Gateway Function ............................ 2-10
2.3 Wiring for Communication ........................................................................... 2-12
2.3.1 Wiring for RS-485 Communication .................................................. 2-12
2.3.2 Wiring for Ethernet Communication ................................................ 2-13
2.3.3 Wiring for RS-485 Communication for Ethernet-Serial Gateway Function .. 2-14
3. Procedures for Setting PR300 Functions
3.1 Basic Setting ................................................................................................... 3-2
3.1.1
Setting of VT Ratio ............................................................................ 3-2
3.1.2 Setting of CT Ratio ............................................................................ 3-3
3.1.3 Setting of Integrated Low-cut Power ................................................. 3-4
3.2 Setting Pulse Output ....................................................................................... 3-5
3.2.1 Selection of Measurement Item for Pulse Output .............................. 3-5
3.2.2 Pulse Unit ......................................................................................... 3-6
3.2.3 ON Pulse Width ................................................................................ 3-7
3.3 Setting Analog Output .................................................................................... 3-8
3.3.1
Selection of Measurement Item for Analog Output ............................ 3-8
3.3.2 Upper/Lower Limits of Scaling .......................................................... 3-9
3.4 Demand Setting ............................................................................................ 3-10
3.4.1
Demand Power/Current .................................................................. 3-10
3.4.2 Demand Period ................................................................................ 3-11
3.4.3 Demand Alarm Mask Time .............................................................. 3-12
3.4.4 Demand Power Alarm Point ............................................................ 3-13