Mitsubishi Electric GB-50ADA-A Service manual

Contents
Page
Safety Precautions............................................ 2
1. Introduction ............................................... 5
1-1. Parts names and functions .............. 5
1-2. Monitor and operation of the air
conditioners...................................... 6
1-3. About “Group” and “Block” ............... 6
2. Parts List ................................................... 6
3. Specifications............................................ 7
3-1. Product Specifications ..................... 7
3-2. External dimensions......................... 7
3-3. Supplying power to the M-NET
transmission lines ............................ 8
4. System configuration ................................ 9
4-1. Setting M-NET address for
various devices .............................. 10
4-2. M-NET system setting example..... 12
5. Installation............................................... 13
5-1. Field-supplied parts........................ 13
5-2. M-NET transmission line length ..... 14
5-3. Installation...................................... 15
6. Wiring connections.................................. 16
6-1.
Installing and uninstalling the cover .. 16
6-2. Connecting the power cable and
protective earth cable..................... 16
6-3. Connecting the M-NET
transmission line ............................ 17
6-4. Connecting the LAN cable ............. 18
7. Initial settings .......................................... 19
7-1. IP address and network settings.... 20
8. Product features...................................... 21
9. Test run................................................... 23
9-1. Batch operation/Stop (error reset)
switches ......................................... 23
9-2. Service LED display....................... 23
10. External input/output ............................... 24
10-1. External signal input function ......... 24
10-2. External signal output function....... 25
11. Copy to USB memory and read from USB
memory ................................................... 26
11-1. Switch setting................................. 27
11-2. Operational data ............................ 28
12. 7-segment LED ....................................... 30
12-1. 7-segment LED display and switch
settings........................................... 31
13. Error code list.......................................... 32
Air-Conditioner Network System
Installation/Instructions Manual
After reading this manual, pass the manual on to the end
user to retain for future reference.
The users should keep this manual for future reference and
refer to it as necessary. This manual should be made
available to those who repair or relocate the units. Make
sure that the manual is passed on to any future air
condition system users.
Centralized Controller
GB-50ADA-A
GB-50ADA-J
To ensure safety and proper operation of the
unit, the unit should only be installed by
qualified personnel.
• Safety notes are marked with
WARNING or CAUTION,
depending on the severity of possible
consequences that may result when the
instructions are not followed exactly as
stated.
Proper installation is important for your
safety and proper functioning of the units.
Thoroughly read the following safety
precautions prior to installation.

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Safety Precautions
• Thoroughly read the following safety precautions prior to installation.
• Observe these precautions carefully to ensure safety.
• After reading this manual, pass the manual on to the end user to retain for future reference.
• The users should keep this manual for future reference and refer to it as necessary. This manual should be made available to those
who repair or relocate the units. Make sure that the manual is passed on to any future air condition system users.
WARNING Indicates a risk of death or serious injury.
CAUTION Indicates a risk of injury or structural damage.
●Nomenclature
(Prohibited actions) (Do not touch) (No water) (No wet hands) (Fire hazards) (Injury hazards) (Important actions) (Grounding required)(Electric shock hazards)
General precautions
All electric work must be performed by qualified personnel.
WARNING
To reduce the risk of fire or explosion, do not place
flammable materials or use flammable sprays around
the controller.
To reduce the risk of damage to the controller, do not
directly spray insecticide or other flammable sprays on
the controller.
To reduce the risk of injury, wear protective gear when
working on the controller.
Do not touch the display panel, switches, or buttons
with a sharp object.
To reduce the risk of injury and electric shock, avoid
contact with sharp edges of certain parts.
To avoid injury from broken glass, do not apply exces-
sive force on the glass parts.
Do not install the controller in a place where large amounts
of oil, steam, organic solvents, or corrosive gases, such as
sulfuric gas, are present or where acidic/alkaline solutions
or sprays are used frequently. These substances can
compromise the performance of the controller or cause
certain components of the controller to corrode, which can
result in electric shock, malfunctions, smoke, or fire.
CAUTION
To reduce the risk of shorting, current leakage, electric
shock, malfunctions, smoke, or fire, do not wash the
controller with water or any other liquid.
To reduce the risk of electric shock, malfunctions,
smoke or fire, do not operate the switches/buttons or
touch other electrical parts with wet hands.
To reduce the risk of injury or electric shock, before
spraying a chemical around the controller, stop the
operation and cover the controller.
Always replace a fuse with the correct current rating.
Using a fuse with the wrong rating or substituting or a
copper wire may cause a fire or explosion.
Properly install all required covers to keep moisture and
dust out of the controller. Dust accumulation and water
can cause electric shock, smoke, or fire.
To reduce the risk of injury, keep children away while
installing, inspecting, or repairing the controller.
To reduce the risk of injury or electric shock, stop the
operation and switch off the power supply before
cleaning, maintaining, or inspecting the controller.

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Do not install the controller where there is a risk of
leaking flammable gas.
If flammable gas accumulates around the controller, it
may ignite and cause a fire or explosion.
To reduce the risk of shorting, current leakage, electric
shock, malfunctions, smoke, or fire, do not install the
controller in a place exposed to water or in a condens-
ing environment.
Controller must be installed by qualified personnel
according to the instructions detailed in the Installation
Manual.
Improper installation may result in electric shock or fire.
Properly dispose of the packing materials. Plastic bags
pose suffocation hazard to children.
Take appropriate safety measures against earthquakes
to prevent the controller from causing injury.
To prevent injury, install the controller on a flat surface
strong enough to support its weight.
Precautions during installation
WARNING
CAUTION
To reduce the risk of damage to the controller, malfunc-
tions, smoke, or fire, do not connect the power cable to
the signal terminal block.
To reduce the risk of current leakage, overheating,
smoke, or fire, use properly rated cables with adequate
current carrying capacity.
All electric work must be performed by a qualified
electrician according to the local regulations, standards,
and the instructions detailed in the Installation
Manual.Capacity shortage to the power supply circuit or
improper installation may result in malfunction, electric
shock, smoke, or fire.
Use properly rated breakers and fuses (breaker, local
switch <switch + fuse>, no-fuse breaker).The use of a
breaker with a breaking capacity greater than the
specified capacity may cause electric shock, malfunc-
tions, smoke, or fire.
Proper grounding must be provided by a licensed
electrician.
Do not connect the grounding wire to a gas pipe, water
pipe, lightning rod, or telephone wire. Improper ground-
ing may result in electric shock, smoke, fire, or malfunc-
tion due to electrical noise interference.
Install an electric leakage breaker and a residual
current circuit breaker on the power supply.
The controller should be repaired or moved only by qualified
personnel. Do not disassemble or modify the controller.
Improper installation or repair may cause injury, electric
shock, or fire.
Properly secure the cables in place and provide
adequate slack in the cables so as not to stress the
terminals.Improperly connected cables may break,
overheat, and cause smoke or fire.
To reduce the risk of injury or electric shock, switch off
the main power before performing electrical work.
Precautions during wiring
WARNING
Precautions for moving or repairing the controller
WARNING
To reduce the risk of shorting, electric shock, fire, or
malfunction, do not touch the circuit board with tools or
with your hands, and do not allow dust to accumulate
on the circuit board.
CAUTION
CAUTION
To reduce the risk of electric shock, shorting, or
malfunctions, keep wire pieces and sheath shavings out
of the terminal block.
To reduce the risk of shorting, current leakage, electric
shock, or malfunctions, keep the cables out of contact
with controller edges.

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To avoid damage to the controller, use appropriate tools to
install, inspect, or repair the controller.
To avoid malfunctions, do not bundle power cables and
signal cables together, or place them in the same metallic
conduit.
Take appropriate measures against electrical noise interfer-
ence when installing the air conditioners in hospitals or
facilities with radio communication capabilities.
Inverter, high-frequency medical, or wireless communication
equipment as well as power generators may cause the air
conditioning system to malfunction. Air conditioning system
may also adversely affect the operation of these types of
equipment by creating electrical noise.
This controller is designed for exclusive use with the Building
Management System by Mitsubishi Electric. The use of this
controller for with other systems or for other purposes may
cause malfunctions. To avoid deformation and malfunction, do not install the
remote controller in direct sunlight or where the ambient
temperature may exceed 55ºC (131ºF) or drop below
-10ºC (14ºF).
Do not install the controller on the Control panel door.
Vibrations or shocks to the controller may damage the
controller or cause the controller to fall.
To prevent unauthorized access, always use a security
device such as a VPN router when connecting to the
Internet.
To avoid damage to the controller, do not overtighten the
screws.
To avoid damage to the controller, do not make holes on the
controller cover.
Additional precautions

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GB-50ADA-A and GB-50ADA-J are centralized controllers that can be operated over the Web.
Any connected air conditioning systems can be operated or monitored over the Web using browser software.
Refer to the Web browser operation manual (separate volume) for how to use this functions.
This manual covers the settings that can be made or functions that can be displayed only on the body of GB-50ADA-A or
GB50ADA-J.
Hereinafter, GB-50ADA-A and GB-50ADA-J, unless otherwise specified, will be called “GB-50ADA.”
1-1. Parts names and functions
1-1.
1-1.
1 Introduction
Error
M-NET
CN5
I/O CN4 Serial
Serial number :
Ver. :
DB No. :
MODEL :
Serial number :
LINK/ACT LAN
Error LED
LAN LED
LAN
Power source 100-240VAC
Terminal block(M3.5)
M-NET Terminal
block(M3.5)
External input/output
terminal(CN5)
M-NET LED