Mitsubishi Electric MDU-BC Manuals

Table of Contents

• • 2

    Table of Contents

• 4

  2 Precautions for Use

  • 4

    Standard Operating Conditions
  • 5

    Withstand Voltage Test
  • 6

    Connection and Installation
  • 7

    Requests
  • 7

    Notes on Usage

• 4

  1 Safety Precautions

• 8

  3 MDU Breaker Installation Instructions

  • 8

    MDU Mounting (External Mounting for 250 a Frame)
    • 8

      Check the Wiring of the Connection Cable
    • 8

      Mounting of MDU Mounting Plate (Figure 2 and 3)
    • 9

      Mounting of MDU to MDU Breaker Main Unit
  • 10

    MDU Mounting (External Mounting for 400/800 a Frame)
    • 10

      Mounting of MDU Mounting Plate
    • 11

      Mounting of MDU to MDU Breaker Main Unit
  • 12

    MDU Mounting (Panel Mounting)
    • 12

      No Transmission, Electric Energy Pulse Output
    • 14

      With CC-Link Communication/Modbus Communication
  • 15

    Wiring of MDU Terminal Block
    • 15

      External Mounting Type
    • 15

      Panel Mounting Type

• 17

  4 MDU Features and Functions

  • 17

    Features of MDU
  • 17

    Functions of MDU
  • 18

    Measurement Functions
    • 18

      Measurement Function List
    • 19

      Measurement Rated Values/Measurement Range and Accuracy
  • 23

    Monitoring Functions
    • 23

      Monitoring Function List
  • 24

    How to Use Monitoring Functions
    • 24

      MDU Breaker Alarms
    • 26

      MDU Breaker Status
    • 26

      Fault Causes
    • 26

      Electric Current Demand Upper/Lower Limit Alarms
    • 26

      Neutral Line Open Phase Alarm (NLA)
  • 27

    Network Specifications for MDU
    • 27

      Electric Energy Pulse Output
    • 27

      CC-Link Communication
    • 27

      MODBUS Communication

• 28

  5 Names and Functions of MDU Parts

  • 28

    Display/Operation Panel
  • 29

    MDU Terminal Block Section
  • 30

    CC-Link Setting Area (with CC-Link Communication Option)
  • 31

    Number of CC-Link Communication Connectable Units and Precautions
  • 32

    Installation and Wiring for Products with CC-Link Communication
    • 32

      Terminator Installation
    • 32

      Shielded Wire Grounding
  • 33

    MODBUS Setting Area (with MODBUS Communication Option)
  • 34

    Installation and Wiring for Products with MODBUS Communication

• 35

  6 MDU Detailed Specifications

  • 35

    Precautions for Measurement

• 37

  7 MDU Operation Procedure

  • 38

    Operating Method for Main Menu Screen
    • 39

      Display Method for Protection Characteristic Setting Values
      • 39

        Protection Characteristic Setting and Setting Method for 250 a Frame
      • 40

        Protection Characteristic Setting and Setting Method for 400/800 a Frame
    • 41

      Method for Various Settings
      • 41

        Setting Method for Measurement-Related Items
      • 43

        Setting Method for Alarms
      • 45

        Setting Method for LCD
      • 47

        Setting Method for Date and Time
      • 48

        Setting Method for Electric Energy
      • 49

        Setting Method for Measurement Items
      • 50

        Setting Method for Free Display
    • 51

      Method for Resetting Alarms
    • 51

      Method for Resetting Fault Cause/Current, Maximum Value, Electric Energy, and Reactive Energy
    • 52

      Method for Displaying Information Screen
  • 53

    Operating Method for Measurement Display Screen
    • 53

      Switching Method for Display Screen
    • 54

      Measurement Display List
    • 58

      Fault/Alarm Display Details

• 59

  8 Appendix

  • 59

    Precautions for Setting Operation
  • 59

    Precautions When Setting Via CC-Link Communication/Modbus Communication
  • 60

    Communication Error Codes and Solutions
  • 60

    Troubleshooting