MB MBMet-500AB Specification sheet

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Solar Irradiation Sensor (Modbus RS485 Output) - Operation and Installation Manual
Models –MBMet-500AB, MBMet-500BB, MBMet-500CB and MBMet-500DB
Document Number:
M4 050 020 010 01 (R1)
(Suitable for HW Version-101 and SW Version – 101)
Contents
Contents ............................................................................................................................................................ 1
1. Warnings .................................................................................................................................................... 2
2. Technical Specifications Solar Irradiation Sensor ...................................................................................... 3
3. Parts of Solar Irradiation Transducer ......................................................................................................... 5
4. Solar Irradiation Transducer– Installation ................................................................................................. 6
5. Solar Irradiation Sensor – Connections ..................................................................................................... 8
6. MBMet-500: – Default Configuration ........................................................................................................ 9
7. MODBUS Registers .................................................................................................................................... 9
7.1 MODBUS Registers: ............................................................................................................................ 9
7.2 Configuration of MODBUS Communication Parameters ................................................................. 10
7.3 Setting Default MODBUS Communication Parameters ................................................................... 12
8. General Maintenance .............................................................................................................................. 13
For service support call us on [phone] or mail us in [e-mail]

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1. Warnings
 Installation at site should be done by skilled and qualified personal after taking required
approvals.
 Use proper protection gear and tool while installing the device.
 Be aware of your surroundings while doing the installation work.
 Serious injury can occur if proper safety norms are not followed.
 Compliance with all utility and electrical safety codes regulations are mandatory.
 Read the manual and get acquainted with the senor connections and terminals before
commencing installation activity.
 Before connecting the sensor system, read its label to confirm power supply
requirements.
 All connections should be done only when power to the sensor is switched off.
 Improper installation and connections may damage the device and sensor connected to
the same.
 Protect from overvoltage and static electricity.
 Physically damaged sensors should not be used or connected to main power.
 Use proper earth connection.
 Use proper size screwdriver (tools) and cable for connection else the terminals
might get damaged.

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2. Technical Specifications Solar Irradiation Sensor
Technical specifications for the Solar Irradiation sensor are provided in table-2.1 below.
Model/ Parameters MBMet-500AB MBMet-500BB MBMet-500CB MBMet-500DB
Output signal RS485 Modbus
Sensor Silicon
Power Supply 9-32 VDC
Power Consumption 100mW
Solar Irradiation
Range 0-1500 W/m2
Accuracy ±5 W/m2 ±3 % of reading
Resolution 1
Response Time 2-3 seconds
Stability 0.5% per annum
Cell Temperature
Range -40 to 90
0
C
Accuracy ±0.3% FS
Resolution 0.1
Response Time 2-3 seconds
Ambient Air Temperature (Integrated Sensor)
Sensor Type - RTD- PT100 - -
Range - -40 to 90
0
C - -
Accuracy - ±0.3% FS - -
Resolution - 0.1 - -
Response Time - 3-5 seconds - -
Ambient Air Temperature (External Sensor with three meters silicon cable)
Sensor Type - - RTD- PT1000 -
Range - - -40 to 90
0
C -
Accuracy - - ±0.3% FS -
Resolution - - 0.1 -
Response Time - - 3-5 seconds -
PV Module Temperature (External Sensor with three meters silicon cable)
Sensor Type - - - RTD- PT1000
Range - - - -40 to 90
0
C
Accuracy - - - ±0.3% FS
Resolution - - - 0.1
Response Time - - - 4-6 seconds
Table-2.1: Technical specifications

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General specifications are provided in table 2.2 below:
Parameter Specification
Irradiation Sensor Enclosure Cast Aluminum
Ingress Protection IP65
Irradiation Sensor Enclosure Size 120 (L) x 76 (W) x 65
(H) mm
Weight 350 grams (approx.)
Mounting clamp (suitable for mounting on PV module side) SS 304
Cable terminals 1.5 sq. mm. copper
Integrated Ambient Temperature Sensor 40mm x 4mm (SS304)
Cable glands (EMC protected) M12x1.5mm
Ambient operating temperature -30 to 700C
Ambient operating humidity 0 to 99% RH
Table -2.2: General specifications

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3. Parts of Solar Irradiation Transducer
Details of parts shipped along with Solar Irradiation Transducer are provided in table 3.1
below.
Mark
in Fig
Description
MBMet-
500AB
(Fig 3.1)
MBMet-
500BB
(Fig 3.2)
MBMet-
500CB
(Fig 3.3)
MBMet-
500DB
(Fig 3.4)
1 Transducer 01 01 01 01
2 Temperature sensor NA Integrated
PT100
External
Ambient
PT1000
External
PV Module
PT1000
3 SS Spring Clip for Temperature
sensor mount NA NA 01 NA
4 Mounting Plate (SS-304) 01 01 01 01
5 M5 X 32mm SS Hex Screw 02 02 02 02
6 M5 SS Washer 04 04 04 04
7 M5 Spring Washer 04 04 04 04
8 M5 SS Nut 04 04 04 04
9 M5 X 20mm SS Round Screw 02 02 02 02
Table-3.1: Parts shipped with MBMet-500.
Fig-3.1: MBMet-500AB Parts Fig-3.2: MBMet-500BB Parts

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Fig-3.3: MBMet-500CB Parts Fig-3.4: MBMet-500DB Parts
4. Solar Irradiation Transducer– Installation
Use the sensor mounting clamp provided along with the sensor to install it at side of the PV
module (or any other location). Care must be taken that the sensor inclination is same as PV
Module.
Step – 1: Drill two holes (M6) at site where the Solar Irradiation sensor is intended to be
installed according to the following figure 4.1.
Fig – 4.1: Mounting holes’ dimension
Step – 2: Install the sensor Mounting Clamp alongside the solar panel with the M5 x 32mm
screws, nut, spring washer and washer provided as shown in the figure 4.2.

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Fig – 4.2: Mounting clamp position
Step – 3: Open the cover of the sensor and mount the sensor to the clamp with the
M5X20mm SS Round Head screws provided along with the sensor. The holes for
mounting the sensor are shown in the figure 4.3.
Fig – 4.3: Holes for fixing sensor to mounting plate.
Note: Keep the sensor cover with solar cell safely. Ensure that there is no scratch on the
solar cell and it is not soiled.
Step – 4: Connect the interface cable according to the sensor specification. Connection
details are given in Section 5 of this manual. After connection is done, close the
cover and tighten the screws fully for retaining the IP protection.

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5. Solar Irradiation Sensor – Connections
Care should be taken so that no components on the PCB are touched.
Terminal numbers on the sensor PCB are given in the picture 5.1 below.
Picture – 5.1: Terminal Numbers of PCB
Connections for the transducer terminals are given in the table 5.1 below.
Terminal
MBMet-500AB MBMet-500BB MBMet-500CB MBMet-500DB
1
9
-
32
V
DC +
9
-
32
V
DC +
9
-
32
V
DC +
9
-
32
V
DC +
2
GND
GND
GND
GND
3
RS485 D+
RS485 D+
RS485 D+
RS485 D+
4
RS485 D
-
RS485 D
-
RS485 D
-
RS485 D
-
5 NA Integrated Ambient
Temperature RTD (A)
External Ambient
Temperature RTD (A)
External PV Module
Temperature RTD (A)
6 NA Integrated Ambient
Temperature RTD (A)
External Ambient
Temperature RTD (A)
External PV Module
Temperature RTD (A)
7 NA Integrated Ambient
Temperature RTD (B)
External Ambient
Temperature RTD (B)
External PV Module
Temperature RTD (B)
8 NA Integrated Ambient
Temperature RTD (B)
External Ambient
Temperature RTD (B)
External PV Module
Temperature RTD (B)
Table-5.1: MBMet-500 connections

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6. MBMet-500: – Default Configuration
Default configuration for solar irradiation sensor with RS485 output are shown in table-5
below.
Sr. No Parameter Default Setting
1 Communication Parameters
1.1 Device MODBUS address 1
1.2 Baud rate 9,600
1.3 Parity None
1.4 Stop bits 1
2. RTD Channel
2.1 Temperature Unit
0
C
Table-6: Default configuration for SmartBox
7. MODBUS Registers
7.1 MODBUS Registers:
MODBUS registers are provided only for models with RS485 communication port.
Parameter values shall be provided as per selected model. Un-supported values will be read as
‘0’.
Parameters from the sensor can be read via MODBUS protocol in both signed integer and
float data formats.
MODBUS
Register
Address
Parameter Default
Values
Length
(bits) Register Type
Parameters
Type
Parameters Read Registers
0 Solar Irradiation - 16 Read only Unsigned
Integer
1 Cell Temperature - 16 Read only Signed
Integer
2
External temperature
(Ambient or PV
Module)
- 16 Read only Signed
Integer
10 Solar Irradiation - 32 Read only Float
12 Cell Temperature - 32 Read only Float
14
External temperature
(Ambient or PV
Module)
- 32 Read only Float
MODBUS Communication Parameters
100
MODBUS ID
(Default:1)
1<ID<247
1 16 Read/Write Unsigned
Integer
101 Baud rate
(Default: 1)
1 16 Read/Write Unsigned

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0=4800; 1=9600;
2=19200
Integer
102
Parity (Default: 0)
0=None; 1=Odd;
2=Even
0 16 Read/Write Unsigned
Integer
103
Stop bits.
1 (only stop bit 1
setting is allowed)
1 16 Read/Write Unsigned
Integer
104
Temperature Units
(Default: 0)
0 = oC; 1 = oK; 2 = oF
0 16 Read/Write Unsigned
Integer
105 Save configuration
parameters * 1 16 Write only Unsigned
Integer
Device Manufacturing Details- Read only
110
Device Model No:
=0 - MBMet500-AB
=1 - MBMet500-BB
=2 - MBMet500-CB
=3
-
MBMet500
-
DB
- 16 Read only Unsigned
Integer
111 Hardware Version - 16 Read only Unsigned
Integer
112 Software Version - 16 Read only Unsigned
Integer
113 Manufacture Year - 16 Read only Unsigned
Integer
114 Device Serial number - 16 Read only Unsigned
Integer
Table: 7.1 – MODBUS registers
Note:
* To save the communication parameters, write ‘1’ in the register else the settings will
not be saved.
7.2 Configuration of MODBUS Communication Parameters
Example is provided below for setting required communication parameters.
Modbus ID: 10
Baud rate: 19200
Parity: Even
Stop Bit: 2
Step-1: Connect the SmartBox to the Modbus Master Software with the default settings.
Step-2: Set the following in the MODBUS Master:
Function: Write Multiple Registers
Starting Address: 100
Number of registers: 5

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Data Type: 16 bits Integer
Step-3: Set the communication parameters as per your requirement. (See example settings)
MODBUS
Register
Address
Parameter Example settings
100 MODBUS ID 10 (Modbus ID=10)
101 Baud rate 2 (Baud Rate = 19200)
102 Parity 2 (Parity = Even)
103 Stop bits 2 (Stop Bit = 2)
104 Temperature Unit 0 (
o
C)
105 Save 1 (Save)
Table No: 7.2 – Modbus communication parameter configuration
Notes:
i) To save the communication parameters, write 1 in register 105 else the settings
will not be saved.
ii) Please note that writing single register is not allowed. All the registers are to be
written in one MODBUS write command.
Step-4: After all the parameters are set in MODBUS Master, write the same to the sensor.
The sensor will stop communication and restart again with modified parameters.
Step-5: Connect to sensor using the modified MODBUS communication parameters in the
MODBUS Master that is set in Step-3. The Solar Irradiance transducer will start
communicating.
Step-6: Configured communication parameters can be verified by reading the
communication MODBUS registers (100 to 104) of the sensor.

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7.3 Setting Default MODBUS Communication Parameters
Procedure for re-setting default communication parameters is as follows.
Step-1: Switch Off the power supply of the device.
Step-2: Locate the Jumper-1 on the PCB as shown in Fig – 7.3.1. The normal position of the
jumper is shown in Fig 7.3.2
Fig – 7.3.1: Location of the Jumper 1
Fig – 7.3.2: Normal Position of Jumper-1 on board.

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Step-3: Change the jumper position from Fig 7.3.2 to Fig 7.3.3
Fig – 7.3.3 Jumper position (for factory resetting)
Step-4: Switch On power supply, wait for 30 sec and switch off the power supply
Step-5: Reconnect the jumper in the original factory position as in Fig 7.3.2
Communication parameters is reset to default settings. This will not change any other settings
of the device.
8. General Maintenance
General maintenance procedures are described below:
i) Keep the solar cell glass clean of any dust.
ii) Use soft cloth to clean the solar panel glass. Do not make any scratches on the glass.
This will produce wrong results.