Mitsubishi Electric NF800-SEW User Manual

Securely insert the connection cable into the MDU connector (until the lock clicks into place). The product will be unable to measure
properly if the connection is poor.
Some models/specifications do not measure or display some items. These items and functions will be skipped.
Connector
MDUMDU Breaker main unit
Connection cable
Caution
Caution
Danger
Indications and what they mean are listed below.
Wrong handling may cause dangerous situation in which possibility of fatal accidents or serious injuries assumed.
Wrong handling may cause dangerous situation in which possibility of significant or minor injuries, or material damages assumed.
INSTRUCTION MANUAL
MDU BREAKER: MDU
TYPE
MDU-BN, MDU-BP, MDU-BC, MDU-BM
MODEL
NF250-SEV with MDU, NF250-HEV with MDU
NF400-SEW with MDU, NF400-HEW with MDU
NF800-SEW with MDU, NF800-HEW with MDU
Using this under certain conditions may cause electrical shock.
● Read this Instruction Manual carefully prior to use, so that the product is used properly.
● After reading this manual, store it in a safe place so that it can be easily referenced when needed.
● Make sure that the end user receives this Instruction Manual.
For models with CC-Link communication, refer to the PLC User’s Manual before reading this Instruction Manual.
• CC-Link System Master/Local Module User
’s Manual
* The CC-Link version is
“CC-Link Ver. 1.10.”

Mitsubishi Electric NF800-SEW Specifications

General

Rated Current (In)	800A
Rated Voltage (Ue)	690V AC
Type	Molded Case Circuit Breaker (MCCB)
Breaking Capacity at 415V AC	50kA
Mounting	Fixed
Standards	IEC 60947-2
Poles	3P
Trip Unit	Electronic

Summary

Safety Precautions

MDU Breaker Installation Instructions

MDU mounting (external mounting for 250 A frame)

Detailed steps for mounting the MDU unit for 250 A frame external installations.

MDU mounting (external mounting for 400/800 A frame)

Detailed steps for mounting the MDU unit for 400/800 A frame external installations.

MDU mounting (panel mounting)

Procedures for panel mounting the MDU unit.

With CC-Link communication/MODBUS communication

Procedures for panel mounting with CC-Link or MODBUS communication.

Wiring of MDU terminal block

MDU Features and Functions

Measurement functions

Details the measurement capabilities of the MDU.

Measurement rated values/measurement range and accuracy

Monitoring functions

Information on the monitoring capabilities of the MDU.

How to use monitoring functions

Guide on utilizing the MDU's monitoring features.

MDU Breaker alarms

Network Specifications for MDU

Technical specifications for MDU network interfaces.

CC-Link communication

MODBUS communication

MDU Operation Procedure

Operating method for main menu screen

Guide to navigating and using the main menu of the MDU.

Display method for protection characteristic setting values

How to view and understand protection characteristic setting values.

Protection characteristic setting and setting method for 250 A frame

Setting protection characteristics for 250 A frame models.

Protection characteristic setting and setting method for 400/800 A frame

Setting protection characteristics for 400/800 A frame models.

Method for various settings

How to configure various settings on the MDU.

Setting method for measurement-related items

Setting method for alarms

Method for resetting alarms

Method for resetting fault cause/current, maximum value, electric energy, and reactive energy

Operating method for measurement display screen

How to navigate and use the measurement display screens.

Measurement display list

A comprehensive list of all available measurement displays and their formats.

Fault/alarm display details

Appendix

Communication error codes and solutions

Lists common communication error codes and their corresponding solutions.

Troubleshooting

General troubleshooting steps for common device issues.