Mitsubishi Electric GB-50A User Manual

Mitsubishi Electric Air-conditioner Network System
Central Controller
Model: GB-50A
Installation Manual
Contents
Before using the controller, please read this Installation Manual carefully to ensure correct
operation. Store this Installation Manual in a location that is easy to find.
1. Safety Precautions to be Observed without Fail ..........1
2. Confirmation of Parts .................................................3
3. Product Feature.........................................................4
4. System Diagram ........................................................5
5. Installation Method ....................................................7
1. Part prepared at site ..............................................7
2. Allowable length of M-NET transmission lines.........7
3. Installation method ................................................8
6. Wiring Method .........................................................11
1. Grounding cable. .................................................11
2. Cover removal and installation .............................11
3. M-NET transmission line ......................................12
4. LAN connection ...................................................12
7. Initial setting............................................................13
1. How to set the IP address with dip switches .........14
2. Setting of the service switch.................................14
8. Test Run .................................................................15
1. Collective operation ON/OFF ...............................15
2. Service LED display.............................................15
9. Example for System Configuration............................16
1. To control a K control model ................................16
2. To use system controllers on multiple units ..........16
10. External Input/Output Usage Method ......................16
1. External signal input function ...............................16
2. External signal output function .............................18

Mitsubishi Electric GB-50A Specifications

General

Type	Centralized Controller
Power supply	24 VDC
Input Voltage	24 V DC
Weight	0.5 kg
Max. connectable indoor units	50 units
Output Type	Relay
Communication Ports	RS-485
Operating Temperature	0°C to 40°C

Summary

Safety Precautions to be Observed without Fail

General Safety Warnings

Critical warnings for electrical shock, fire, and physical hazards during installation.

Environmental and Handling Cautions

Cautions regarding installation environment, handling, and potential damage or malfunction.

Confirmation of Parts

Product Feature

Product Specifications

Details on interface, environmental conditions, dimensions, weight, and installation environment.

Outline Dimensions

Visual representation of the main body and L-fittings with dimensions.

System Diagram

Installation Method

Required Parts for Installation

Lists required preparation parts like screws, cables, and terminals for installation.

M-NET Transmission Line Length Limits

Specifies maximum lengths for M-NET transmission and power feeding.

Installation Methods

Details different installation methods like using L-fittings or DIN rail.

Wiring Method

Grounding Cable Connection

Instructions for connecting the protective earth cable to the unit.

Cover Removal and Installation

Steps for removing and installing the controller's cover.

M-NET Transmission Line Connection

How to connect the M-NET transmission lines to the terminal block.

LAN Connection

Instructions for connecting the LAN cable and network configuration.

Initial Setting

Initial Setting Steps Overview

Outline of steps for initial setup: IP address, license, group, other settings, test run.

Initial Setting Notes and Credentials

Notes on setting methods (tool vs. web) and default login credentials.

IP Address Setting via Dip Switches

Procedure for setting IP address using the 4-pin dip switch.

Service Switch Configuration

How to configure the service switch for normal or update mode.

Test Run

Collective Operation Test

Procedure for testing collective operation by turning units ON/OFF.

Service LED Status Display

Explanation of the status LEDs on the unit.

Example for System Configuration

K Control Model Configuration Example

Configuration steps for controlling a K control model unit.

Multi-Unit System Controller Setup

Steps for setting up interlocks or group settings for multiple units.

External Input/Output Usage Method

External Signal Input Function

How to use external signals for control functions like emergency stop.

External Input Signal Details and Specifications

Details on signal types, specifications, and recommended circuits for external inputs.

External Signal Output Function

How to use external signals for outputting ON/Malfunction status.

External Output Signal Details and Circuit

Specifications and circuit examples for external signal outputs.