Mitsubishi Electric AHU-KIT-SP User manual

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
CONTENTS
PSZ000Z308 1/38
MODEL NAME
MODEL TYPE
ISSUE CLASSIFICATION
DWG NO.
REV.MARK
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Contents
1. Specifications..................................................................................................................................................................................................................................................2
2. System configuration ......................................................................................................................................................................................................................................3
3. Function ..........................................................................................................................................................................................................................................................6
4. Rotary switch function.....................................................................................................................................................................................................................................8
5. DIP switch function .........................................................................................................................................................................................................................................9
6. Short PIN function.........................................................................................................................................................................................................................................10
7. Input/output circuit.........................................................................................................................................................................................................................................11
7.1 Input circuit ...............................................................................................................................................................................................................................................12
7.2 Output circuit ............................................................................................................................................................................................................................................16
7.3 Input/output circuit ....................................................................................................................................................................................................................................16
8. Cascade control............................................................................................................................................................................................................................................17
9. Rotation control.............................................................................................................................................................................................................................................18
10. Fault backup control......................................................................................................................................................................................................................................19
11. Modbus communication ................................................................................................................................................................................................................................20
12. Protection control..........................................................................................................................................................................................................................................32
13. Error display..................................................................................................................................................................................................................................................34
14. Installation work ............................................................................................................................................................................................................................................35
15. Wiring procedure...........................................................................................................................................................................................................................................37
16. External dimensions......................................................................................................................................................................................................................................38

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 2/38
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MODEL TYPE
ISSUE CLASSIFICATION
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1. Specifications
AHU-KIT-SP (AHU interface) is the controller dedicated to making the AHU system by using a split type outdoor unit.
AHU interface equips 0–10V and 4–20mA analog input as a basic capacity control method of the connected outdoor unit.
As an alternative control method, the setting temperature control can be used from the remote controller as well.
In addition, AHU interface can communicate over the Modbus protocol and it enables the capacity control (0–100%) or setting temperature control according to requirements.
For more details, please see the relevant sections.
Model AHU-KIT-SP
Outdoor unit compatibility See below (*1)
Usage environment Temperature：-20～60 ℃
Relative humidity：less than 85% RH (without condensation)
Storage environment Temperature：-20～70 ℃
Relative humidity：40%～90% RH (without condensation)
Power supply Single phase 220–240V +10%，-15% 50Hz
Single phase 220V +10%，-15% 60Hz
Power consumption 5W
Product dimensions
(height×width×depth) 109.5 mm × 290 mm × 57 mm
Weight 0.55 kg
Installation DIN rail TS 35 mm × 7.5 mm (separate DIN rail required)
Cascade connection Max 16 outdoor units can be combined by cascade control
(16 interfaces are required)
Power blackout compensation This interface does not have a battery circuit for power blackout recovery.
Operation can continue：The power blackout duration is 30 msec or less.
Heat exchanger sensor (Thi-R1，Thi-R2，Thi-R3)×1
Return air sensor (Thi-A)×1
Reserve sensor×1
Spring leaf for heat exchanger sensor ×3
Ferrite core for functional ground wire ×1
Installation manual
Caution label
Accessories
(* 1) Connectable outdoor unit
R410A R32
40/50/60 SRC40/50/60ZSX-S, SA SRC40/50/60ZSX-W1, W2, WA
71 FDC71VNX FDC71VNX-W
FDC100/125/140VN(S)A FDC100/125/140VN(S)A-W
FDC100/125/140VN(S)X FDC100/125/140VN(S)X-W
200/250 FDC200/250VSA FDC200/250VSA-W
280 FDC280VSA-W
Model
apa ity
Outdoor unit
100/125/140

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 3/38
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2. System configuration
Note 1: Only one outdoor unit can be connected to the AHU interface.
However, it is possible to connect up to 15 slave interfaces to the master by setting the AHU interface to the master setting.
Up to 16 AHU interface × outdoor units can be connected in 1 system including the master.
Note 2: Remote control and Modbus communication are valid only for the master unit.
Note 3: Be sure to connect a leakage breaker in leakage category III.
●AHU interface configuration
Model Contents Applications
AHU-KIT-SP
Interface controller
(master/slave)
Single refrigerant system.
Multiple refrigerant system (cascade control).
Heat exchanger sensor Obtain the heat exchanger temperature information.
Those sensors must be connected each interfaces.
Return air sensor Obtain the return air temperature information.
This sensor must be connected with master interface.
Reserve sensor Reserve.
AHU equipment (heat exchanger, fan, total heat exchanger, etc.) be should be procured on site.
●Remote control
The remote controller shown in the table below can be connected.
Model Contents Applications
RC-EX3A Remote control Connection is optional.
RC-E5 Necessary when Temperature Control is used as a control method.
※ ： Leakage breaker
Fan
AHU
AHU
Controller
AHU interface
Master
Remote
controller
Modbus
Master
AHU interface
Slave➀
Slave➀
Slave⑮
Heat exchanger
…
Heat exchanger sensor
Return air
sensor
Single
outdoor
unit
Single
outdoor
unit
Single
outdoor
unit
Analog input
Digital input
Digital output
E
X0
E
X0
E
E
X5
X1
CNH X2 X3 X4
CNN
CNN
AHU interface
Slave⑮
CNN
X0
Heat exchanger sensor
Heat
exchanger
sensor
X7 X7 X7

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 4/38
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◇Temperature Control SW7-4：ON (Set temp. control:18℃⁻30℃)
System diagram
The following control system can be used for Temperature Control.
★：Main Controller for Temperature Control
○：Optional Controller
×：Not available
(*4) Last received operation command has priority.
(*5) Select one of the following ways to Run/Stop the AHU system:
- Digital input (ON/OFF)
- Modbus command (Run/Stop)
- Remote controller command (Run/Stop)
Table 1-2
AHU
Controller
AHU Interface
Master
AHU Interface
Slave1
AHU Interface
Slave15
Comp. speed Comp. speed Comp. speed
Set temperature
Modbus
Controller
Digital
Input/Output Analog input
Master Slave15
Slave1
No. Analog input
(0-10V/4-20mA) Modbus Remote Control (Include SL Adaptor)
AHU System
How to Run/Stop
3 × ★(*4) ○(*4) Digital input, RC or Modbus(*5)
4 × ○(*4) ★(*4) Digital input, RC or Modbus(*5)
●
Select control method and settings
The outdoor units can be controlled by one of two methods (Capacity Control or Temperature Control).
Select the suitable control combination (No.1-No.4) based on the equipment to be installed.
Correct Master/Slave settings are required when using cascading control.
Check each setting by referring to table 1-1, 1-2 in this section.
◇Capacity Control SW7-4：OFF (External input:0-10V / 4-20mA / 0-100% )
System diagram
The following control combinations are to be used for Capacity Control.
★：Main Controller for Capacity Control
△：Optional Controller
×：Not available
(*1) Analog input will be invalidated once 0-100% command is sent from the Modbus controller.
Power reset is required to restore analog input function.
(*2) Monitoring purpose only. Operation from remote controller is not possible.
(*3) Select either of the following ways to Run/Stop the AHU system:
- Digital input (ON/OFF)
- Modbus command (Run/Stop)
Table 1-1
AHU
Controller
AHU Interface
Master
AHU Interface
Slave1
AHU Interface
Slave15
Analog Input
0～10V or 4-20mA
Comp. speed Comp. speed Comp. speed
Modbus
Controller
Modbus
0-100%
Digital
Input/Output
Master Slave15
Slave1
No. Analog input
(0-10V/4-20mA)
Modbus
(0-100%)
Remote Control
(Include SL Adaptor)
AHU System
How to Run/Stop
1★△(*1) Monitoring only(*2) Digital input or Modbus(*3)
2 × ★Monitoring only(*2) Digital input or Modbus(*3)

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 5/38
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●Heat exchanger, minimum airflow and recommended circuits
・Be sure to select and set the capacity of the heat exchanger connected to each outdoor unit and the minimum air volume according to the following table.
・The table below is for both R 32 and R 410 A refrigerants.
・The range of use for air conditions conforms to the specifications of the outdoor unit.
Refer to the technical manual for the outdoor unit.
Min Max m
3
/h m
3
/min
SRC40 0.3 0.8 420 7
SRC50 0.3 0.9 420 7
SRC60 0.5 1.1 480 8
FDC71 0.7 1.6 600 10
FDC100 0.7 2.1 840 14
FDC125 1.0 2.2 960 16
FDC140 1.0 2.8 1080 18
FDC200 1.2 4.2 1680 28
FDC250 2.0 4.4 1920 32
FDC280 2.0 4.4 2160 36
Outdoor unit
model capacity
Allowable heat exchanger
volume
L
Minimum air volume
・Recommended circuit number for D9.52 tube
Outdoor unit model capacity 40 50 60 71 100 125 140 200 250 280
Recommended circuit 2〜4 4〜6 6〜10

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 6/38
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3. Function
AHU interface outputs outdoor unit information to the outside. It also controls the compressor speed of the outdoor unit in response to external input.
Some settings can be changed by Modbus communication.
●Input/output list #1 of AHU interface
Item Remarks
Yellow Interface address 0-F
Yellow Always 0
Red Always 0
Red Always 0
Yellow Modbus address (ones) 0–9
Yellow Modbus address (tens) 0–9
-1 Analogue input switching ON: 4–20ｍA
OFF: 0–10V
-2 Modbus baudrate (bps) ON: 9600bps
OFF: 19200bps
-3 Modbus parity ON: non parity + 2 stop bit
OFF: even parity + 1 stop bit
-4 Compressor control ON: Temperature Control
OFF: Capacity Control
-1 ON: cooling/heating
OFF: run/stop
-2 Always OFF
-3 Always OFF
-4 Always OFF
3P 1–2 short: not available
2–3 short: available 100Ω
3P 1–2 short: 0–10V
2–3 short: 4–20mA
3P Always 2–3: short
Reserve
Reserve
Reserve
DipSW
Black
Black
Reserve
Reserve
Reserve
SW5
ShortPIN
SW Settings
RotarySW
Contents
Digital output: X4d switching
Modbus termination switching
Analogue input switching
SW
SW1
SW2
SW3
SW4
SW6
SW7
SW8
JX1
Reserve
JX2
JX3
Note 1: Use the “Reserve” switch with OFF or 0 setting.
Note 2: The SW setting follows the setting at power-on.
Be sure to set SW at installation.
To change the SW setting after turning on the power, the power must be turned off once.

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 7/38
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ISSUE CLASSIFICATION
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●Input/output list #2 of AHU interface
Item Connector
LED Housing Color Remarks
CNH 2P Return air temperature Black Thi-A
CNF 2P Reserve Yellow The CNF connector can not be used.
Heat exchanger (U-bend) Thi-R1
Heat exchanger (capillary) Thi-R2
Heat exchanger (header) Thi-R3
X3 2P Capacity control Green Depending on the JX2 setting,
0-10V/4-20mA can be switching.
X2-1: run/stop Power supply: AC24-240V/DC20-130V 0.5A
X2-2: cooling/heating Power supply: AC24-240V/DC20-130V 0.5A
X2-3: emergency stop Power supply: AC24-240V/DC20-130V 0.5A
X2-4: reserve Power supply: AC24-240V/DC20-130V 0.5A
X2-5: common Common terminal
X4a 2P Outdoor unit, interface error Voltage free at contact output
X4b 2P Compressor ON Voltage free at contact output
X4c 2P Defrost ON Voltage free at contact output
X4d 2P
Voltage free at contact output
X4d is selectable by Modbus communication
LED1 Normal Green
LED2 Error Red
X1 2P Remote control Green Remote control and SC-ADNA-E can be connected
X5 3P Modbus Green RS-485 communication circuit
2P
2P
X0-2 is an empty port due to reinforced insulation
AC220–240V
AC220–240V
Connector/LED
Cascade reserve
X0-1: functional ground
Digital
Output
Function
Analog
Input
Digital
Input
Input/
Output
Yellow
X2 5P Green
CNN 6P
Green
Selection:
①Run/stop【initial】
②Cooling/heating
X7 Cascade Green
GreenX0 5P
X0-2: empty port
X0-3: power L phase
X0-4: power N phase
X0-5: communication terminal

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 8/38
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4. Rotary switch function
Item Remarks
Yellow Interface address 0-F
Yellow Always 0
Red Always 0
Red Always 0
Yellow Modbus address (ones) 0-9
Yellow Modbus address (tens) 0-9
SW6
SW
SW1
SW2
SW3
SW4
Reserve
Reserve
Reserve
SW5
RotarySW
Contents
・Set master and slave by SW1.
・For a single refrigerant system, always set the address of A U interface to 0.
・For cascade control, set the master address to 0 and the slave address to a value other than 0 (1 to F).
・Rotary SW5 and SW6 are address settings for Modbus communication.
SW5 is Modbus address ones place and SW6 is Modbus address tens place.
In Modbus communication, A U interface is a slave.
Set the Modbus address in 01 – 99 (Initial address setting: 01).
The Modbus address cannot be set to 0.
RotarySW
<Modbus address example>
Modbus address: 38
SW6: 3 SW5: 8

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 9/38
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5. DIP switch function
Item Remarks
-1 Analogue input switching ON: 4–20ｍA
OFF: 0–10V
-2 Modbus baudrate (bps) ON: 9600bps
OFF: 19200bps
-3 Modbus parity ON: non parity + 2 stop bits
OFF: even parity + 1 stop bit
-4 Compressor control ON: Temperature Control
OFF: Capacity Control
-1 ON: cooling/heating
OFF: run/stop
-2 Always OFF
-3 Always OFF
-4 Always OFF
SW7
SW8
ContentsSW
DipSW
Digital output: X4d switching
Reserve
Reserve
Reserve
Black
Black
・SW8-2, SW8-3, SW8-4 are reserve.
Be sure to set OFF.
【SW7-4】 OFF: Capacity Control, ON: Temperature Control
・The compressor control can be selected in 2 patterns by SW7-4.
(1)SW7-4 OFF: Capacity Control
・When capacity control is set (default setting), the required capacity is directly commanded to the compressor.
・In the following way, 0% to 100% of the outdoor unit (compressor capacity) can be specified as the required capacity.
①Depending on the input voltage (0–10 V) or input current (4–20 mA) from the analog input, the corresponding required capacity is sent to the outdoor unit.
②With Modbus communication, the required capacity is commanded to the outdoor unit at 0–100%.
③In analog input and Modbus communication above, directives from Modbus commnunication take precedence.
Once Modbus sends 0–100% command, the analog input will be disabled thereafter.
(2)SW7-4 ON: Temperature Control
・When temperature control is set, the compressor is controlled by the difference between the return air sensor value of the A U interface and the set temperature.
・Controls the outdoor unit so that the return air sensor value approaches the set temperature.
DIP SW

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 10/38
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MODEL TYPE
ISSUE CLASSIFICATION
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6. Short PIN function
Item Remarks
3P 1–2 short: not available
2–3 short: available 100Ω
3P 1–2 short: 0–10V
2–3 short: 4–20mA
3P Always 2–3 short
ContentsSW
ShortPIN
Modbus termination switching
Analog input switching
Reserve
JX1
JX2
JX3
・By switching the short PIN on the interface, the function on the circuit can be switched.
・JX1: switches the terminal resistor of the Modbus communication circuit.
・JX2: switches the function of the analog input circuit.
・The JX3 is a reserve. Do not change from initial setting (2–3 short).
PWB of AHU interface
JX1
(Termination available/ not available)
1–2 Short : not available
2–3 Short : available 100Ω
13
JX2
(Analog input switching)
1–2 Short : 0-10 V
2–3 Short : 4-20 mA
1
3

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 11/38
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Remote control
communication
Analog input
Thi-A
Return air
sensor
Cascade
Digital input
Common Digital output
Outdoor unit
AC220–240V 50 Hz
AC220V 60 Hz
Thi-R1
Thi-R3
Thi-R2
Heat exchange
sensor
Functional
ground wire
Modbus
GND
B A
Cascade
spare
JX1
(Termination available/ not available)
1–2 Short: not available
2–3 Short: available 100 Ω
3
1
Enclosure
plate
2N
13
1N
-X1 (remote control), X5 (Modus) can be used for
only master unit.
-CNN (Thi-R1/2/3) and CNH (Thi-A) must be
connected.
See the 21 -AHU-T-393 manual for details
+
-
X0
5 4 3 2 1
7. Input/output circuit
Refer to the diagram below for wiring.
X0-1 is the functional ground.
Wrap the ferrite core included around 6 turns (5 loops).
Connect to the plate of the enclosure.
Wire diameter: 0.75 mm2Greater than or equal to.
Line length: 40 cm or more (recommended).
Connect the X0-3 to the L-phase of the outdoor unit.
Connect the X0-4 to the N-phase of the outdoor unit.
Connect the X0-5 to the communication terminal of the outdoor unit.
X0-2 is a free port. Do not connect anything.

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 12/38
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Cooling Heating
Thi-R1 U-bend Evaporating temperature Condensing temperature Anti-freezing protection
Thi-R2 Capillary Evaporating temperature Outlet temperature Anti-freezing protection
Thi-R3 Header Outlet temperature Inlet gas temperature EEV-control
Detected temperatureMounting
position Purpose
Input circuit
●Mounting guidelines for sensors
Mounting position of the sensor (example)
Installing temperature sensors
Correctly securing temperature sensors (Example)
When installing the temperature sensors, make sure that they have optimum contact
with the surface to be measured.
Secure with a wide-band hose clamp.
[Important]
Using cable ties will lead to faulty and squashed temperature sensors
Use wide-band hose clamps for fastening
Installation locations of the heat exchanger sensor
Mounting position of temperature sensors (example)
No. Designation
1 Temperature sensor cable
2 Temperature sensor
3 Fastener
Function of each heat exchanger sensor

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 13/38
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ISSUE CLASSIFICATION
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Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 14/38
MODEL NAME
MODEL TYPE
ISSUE CLASSIFICATION
DWG NO.
REV.MARK
PAGE
21
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Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 15/38
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100
Required capacity
contol command [%]
Analog input current [mA]
20
00 4 19.5
100
Required capacity
contol command [%]
Analog input voltage [V]
10
00 9.01
●Analog input circuit
・Compressor speed can be controlled by the analog input signal (0–10V / 4–20mA).
AHU interface converts 0–10V/4–20mA signal into the 0–100% range to understand how much capacity are required as a AHU.
Outdoor unit operates with the maximum compressor speed when 100% required capacity is used.
To use analog input function, make sure you enable the capacity control by configuring DIP SW7-4 as "OFF" (see 5 for more details).
① 0–10V Capacity Control (SW7-1: OFF and JX2 1-2 short)
0–10V signal is regarded as a required capacity of 0–100%.
Please note that there is a dead band in certain ranges.
(ex) When 0.5V is input, it would be regarded as 0% required capacity.
② 4–20mA Capacity Control (SW7-1: ON and JX2 2–3 short)
4–20mA signal is regarded as a required capacity of 0–100%.
Please note that there is a dead band in certain ranges.
(ex) When 0.9V is input, it would be regarded as 0% required capacity.
・The analog input signal: 0–10[V]/4–20[mA] controls the required capacity of the outdoor unit in the following range.
●Digital input circuit
・ON/OFF can be recognised by the changing edge of the voltage to the digital input terminal.
・X2-5 is a common terminal.
When using X2-1 to X2-4, wire them together with X2-5.
・The functions of the digital input terminals are as follows.
Terminal Function ON OFF
X2-1 Run/Stop Run Stop
X2-2 Cooling/Heating Heating Cooling
X2-3 Emergency stop Emergency stop Emergency stop release
X2-4 Reserve - -
X2-5 Common
X2
Digital input：Example X2-2
Power supply
AC24V-240V
AC DC
X2
Power supply
DC20V-130V
1234512345

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 16/38
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Terminal Function ON OFF
X4a Outdoor unit/interface error Error Normal
X4b Compressor ON Compressor ON Compressor OFF
X4c Defrost ON Defrost ON Defrost OFF
X4d Function selectable* Run Stop
Function ON OFF
ON Operation mode output Heating Cooling
Run/stop Run Stop
(Fan ON/OFF) (Fan ON) (Fan OFF)
OFF
Digital Output:X4d
DipSW8-1
Output circuit
●Digital output circuit
・The digital output terminal output ON/OFF status.
・The functions of the digital output are as follows.
●LED output circuit
・The LED output shows the normal/abnormal status of the system.
・LED 1 (green): blinks at 0.5 sec intervals during normal operation.
・LED 2 (red): flashes when abnormal (lights out when normal).
The number of flashes changes depending on the error status. For details, refer to (13) error display.
Input/output circuit
・Input/output functions are as follows.
Item Connector Housing
X1 2P Remote control
X5 3P Modbus
2P
2P
X0 5P
Cascade control (reserve)
Power (X0-2 is an empty port)
Function
Input/output X7 Cascade control
・X5 : Modbus communication circuit terminal.
X5-1 A polor
X5-2 B polor
X5-3 GND
JX1 1–2: not available
(termination) 2–3: available 100Ω
・X7 : Cascade connection terminal.
owever, X7-3 and X7-4 are reserve circuits.
(*) Setting of Xd4 can be changed by SW8 -1.
Digital output
Voltage free a contact output
X4aX4bX4cX4d

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 17/38
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The master commands each slave.
8. Cascade control
●Multiple refrigerant system
・By connecting the AHU interface with the X7 connector, up to 16 units can be connected.
・The interface address of master is fixed to 0. Slave address can be set from 1 to F.
・Connect one outdoor unit per AHU interface.
・Run/stop, operation mode, and thermo ON/OFF are all judged by master.
・Slave only receives commands from master.
・In cascade control, rotation control and fault backup control are automatically enabled.
●Capacity distribution of cascade control
・The master commands the capacity to each slave.
・The image is shown below.
Each slave operates according to the master command.
The master calculates X_all from the following:
・Analog input or Modbus or remote control
(0–10V/4-20mA, 0–100%, set temperature)
・Number of outdoor units
25
100
Capacity command [%]
Required capacity of the system X_all[%]
100 2000 25 125 225
X1 X2 X3

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 18/38
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9. Rotation control
・In cascade control, rotation control is automatically enabled.
・This control averages the compressor accumulated time of all outdoor units.
・When the outdoor unit starts operating, the outdoor unit with the lowest compressor accumulated time is preferentially operated.
・When 12 hours have elapsed since the outdoor unit started operating, the outdoor unit will be switched.
*Operation switching time: 12 hours is fixed.
・This is an example of rotation control.
Rotation control example

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 19/38
MODEL NAME
MODEL TYPE
ISSUE CLASSIFICATION
DWG NO.
REV.MARK
PAGE
21
.
09
.
17
10. Fault backup control
・In cascade control, fault backup control is automatically enabled.
・When an abnormality occurs in an outdoor unit during operation, another outdoor unit automatically starts operating.
・Even if the outdoor unit that stopped abnormally is restored, the operation of the outdoor unit does not change.
・An example of fault backup control is shown below.

Air Handling Unit Interface
AHU-KIT-SP
MORIKAWA
SPECIFICATION
PSZ000Z308 20/38
MODEL NAME
MODEL TYPE
ISSUE CLASSIFICATION
DWG NO.
REV.MARK
PAGE
21
.
09
.
17
11. Modbus communication
・X5 is Modbus communication connector.
・Modbus communication specifications are as follows.
Item Specification Note
Transmission mode RTU (remote terminal unit)
(1) 9600bps DipSW7-2 ON
(2) 19200bps DipSW7-2 OFF
Data bit 8
(1) Non parity + 2 stop bits DipSW7-3 ON
(2) Even parity + 1 stop bit DipSW7-3 OFF
Node number RotarySW5: ones place
(slave address) RotarySW6: tens place
X5-1: A polar
X5-2: B polar
X5-3: GND
Modbus master:
External controller : 1pcs
Modbus slave:
AHU interface :1pcs
01～99 (initial：01)
Combinations
Transmission speed
Parity/stop bit
Connection RS-485 communication
・Modbus can monitor the status of the AHU interface and outdoor units.
Modbus can also change some settings.
●Modbus function
・The function codes are as follows:
Function name Remarks
3 (0x03) Read holding register Read the contents of the holding register
4 (0x04) Read input register Read the contents of the input register
6 (0x06) Preset single register Change the contents of the holding register
16 (0x10) Preset multiple registers Change the contents of multiple consecutive holding registers
Function code
●Modbus data information
・Modbus data type, data length and address allocation range are as follows.
Target register Data length Type of access Register address range
Input register 2 byte Monitoring only 30001～39999
Holding register 2 byte Monitoring / control 40001～49999