Fonrich FR-DCMG-MMPS Manuale utente
User Manual
Version 1.5
DC System Monitor：FR-DCMG-MMPS
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Fonrich (Shanghai) New Energy Technology Co., Ltd.
Add: 1st Floor, Building 5, No.999 Jiangyue Road, Minhang District,Shanghai
Web: www.fonrich.com
Tel: +86 21 61679671
Email: sales@fonrich.com
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Table of Contents
Table of Contents............................................................................................................................................................1
1 Documentation statement...............................................................................................................................................3
2 Safety Precautions...........................................................................................................................................................3
2.1 Signs.........................................................................................................................................................................3
2.2 Safety Precautions....................................................................................................................................................3
2.3 Personnel requirements............................................................................................................................................ 3
2.4 Electrical connection................................................................................................................................................4
2.5 System running........................................................................................................................................................ 4
3 Product description.........................................................................................................................................................5
3.1 The main function.................................................................................................................................................... 5
3.2 Terminal Definition.................................................................................................................................................6
4 Wiring diagram of monitoring module.........................................................................................................................7
4.1 Electrical wiring diagram.........................................................................................................................................7
4.2 Ground connection and RS485 communication shielded wire................................................................................ 8
5 UI introduction................................................................................................................................................................9
5.1 Key operation...........................................................................................................................................................9
5.2 Boot interface...........................................................................................................................................................9
5.3 Current interface...................................................................................................................................................... 9
5.4 Channel current data.............................................................................................................................................. 10
5.5 Parameter settings..................................................................................................................................................10
5.6 Trip self-test setting interface................................................................................................................................ 11
5.7 Current calibration setting interface...................................................................................................................... 12
5.8 System information display interface.................................................................................................................... 12
5.9 Alarm status display interface............................................................................................................................... 13
5.10 DC arc fault alarm interface................................................................................................................................ 13
5.11 Fault alarm clear interface................................................................................................................................... 13
6 Alarm information management.................................................................................................................................14
6.1 Items that can generate alarms can be set..............................................................................................................14
6.2 Items that can be tripped by setting....................................................................................................................... 14
6.3 Alarm conditions................................................................................................................................................... 15
6.3.1 Alarm judgment condition........................................................................................................................15
6.3.2 Trip judgment condition...........................................................................................................................15
6.4 Alarm message.......................................................................................................................................................15
6.5 Arc Alarm Strategy................................................................................................................................................15
6.5.1 Arc mode.................................................................................................................................................. 15
6.5.2 Arc alarm strategy.................................................................................................................................... 16
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6.5.3 Arc alarm time..........................................................................................................................................16
6.6 Combined alarm strategy (closed by default, follow the steps below when needed)............................................16
7 MODBUS Protocol Definition..................................................................................................................................... 17
7.1 Communication format configuration................................................................................................................... 17
7.2 Data frame format description (refer to Modbus RTU standard).......................................................................... 17
7.2.1 Data message example............................................................................................................................. 17
7.3 Function code description......................................................................................................................................18
Register reads and writes in bits........................................................................................................................18
Register read and write in word units................................................................................................................18
7.4 Register description............................................................................................................................................... 18
7.4.1 Register description in bit units (function code 02)................................................................................. 18
7.4.2 Register description in word unit (function code 03 04 06).....................................................................30
8 Appendix....................................................................................................................................................................... 38
8.1 Document revision record......................................................................................................................................38
8.2 Contact us.............................................................................................................................................................. 39
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CAUTION
1 Documentation statement
This manual applies to the product model FR-DCMG-MMPS, and the software version is A08D.
2 Safety Precautions
2.1 Signs
The following signs may appear in this article, and their meanings are as follows.
2.2 Safety Precautions
Please read the safety precautions in this user manual carefully to avoid personal injury and
property damage.
2.3 Personnel requirements
The installation and operation of FR-DCMG-MMPx must be carried out by a professional
electrician.
The operator should be fully familiar with the composition and working principle of the entire
photovoltaic grid-connected power generation system, as well as the relevant standards of the
country/region where the project is located.
Live operation is strictly prohibited during installation. Before installation, make sure that both
the DC side and the AC side are powered off.
Signs
Instructions
Indicates a hazardous situation which,if not avoided, will result in
death or serious injury.
Indicates a hazardous situation which,if not avoided, could result in
death or serious injury.
Indicates a hazardous situation which,if not avoided, could result in
minor or moderate injury.
Indicates a situation which,if not avoided, can result in property
damage.
It is not safety warning information, and does not involve personal,
equipment and environmental damage.
Note
Protrudes important or critical information, best practices, tips, etc.
It is not safety warning information, and does not involve personal,
equipment and environmental damage.
WARNING
DANGER
NOTICE
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Please read this user manual carefully before installation. If the equipment is damaged due to
failure to install in accordance with this user manual, our company reserves the right not to guarantee
the quality.
Before installation, make sure that it is not electrically connected and powered on.
During the installation process, except for the wiring terminals of the arc box, please do not touch
other parts inside.
Before making electrical connections, make sure that the voltage of the positive and negative
poles of the DC busbar of the combiner box is 0V.
2.4 Electrical connection
Before electrical connection, please make sure that FR-DCMG-MMPx is not damaged and in a safe
state, otherwise it may cause electric shock.
All electrical connections must meet the electrical standards of the country/region where they are
located.
The cables used in the PV combiner box must be firmly connected, well insulated, and have
appropriate specifications.
2.5 System running
FR-DCMG-MMPx has high voltage during operation, which may cause electric shock or death
in severe cases. Please operate strictly in accordance with the safety precautions listed in this manual
and other related documents.
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3 Product description
FR-DCMG DC monitor products are mainly used in DC transmission, power distribution and
other occasions, such as photovoltaic combiner boxes, arc protection boxes, etc. Through RS485
communication with the host computer, its main functions include real-time monitoring of the current
of each branch in the DC system, the temperature of the cabinet, the status of the lightning arrester
and the status of the DC circuit breaker, etc. It can realize automatic alarm for abnormal conditions
and real-time detection of harmful arcs in the DC circuit. Once there are harmful arcs, an alarm signal
will be sent immediately to directly drive the trip unit and cut off the fault circuit, thereby effectively
preventing potential safety hazards such as fires caused by arcs.
3.1 The main function
Monitoring function: real-time monitoring of the generation current, voltage, temperature of the
combiner box, lightning protector status, DC circuit breaker status, and DC arc fault status of
each photovoltaic string in the combiner box, and communicate with the host computer through
RS485.
Display content: For the detected current, temperature, switch status and other data, FR-DCMG-
MMPS can display histogram interface through LCD, and read current and other data more
intuitively.
Alarm function: According to the actual needs of the site, it can be configured to turn on or off
the alarm and shunt release functions (by default, only the arc alarm and trip functions are turned
on). When alarming, the interface pops up alarm information.
Tripping mode switching: The default O+, O- voltage is 0V, and the voltage output is 24V
when tripping, or it can be set to the opposite application.
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3.2 Terminal Definition
Symbol
Meaning
PV+/PV-
Measuring voltage
NC
Not connecion
S
Not connecion
A/B
RS485 Communication terminal
FG
Fixed Ground terminal
TS1/TS2
Externally connected temperature sensor terminals
SG
Temperature sensor and digital input ground terminal
DI1/DI2/DI3/DI4
4 digital input terminals
O+/O-
Connecting the shunt release
FUC
Can connect modules with FUC interface
FMB
Modules with an FMB interface can be connected, such as the FR-
DCMG-AS4A DC Arc Detector.
O+/SG
24V power supply terminal, O+ connects to 24V+, SG connects to 24V-
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4 Wiring diagram of monitoring module
4.1 Electrical wiring diagram
Note: O+ is connected to 24V+, SG is connected to 24V-, if the connection is reversed, the module
may be damaged
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4.2 Ground connection and RS485 communication shielded wire
The FG terminal of the FR-DCMG must be grounded, otherwise communication will interfere
and the reliability of the device will decrease. The grounding wire should be grounded nearby. The
grounding wire should be no more than 15cm from the “FG” terminal to the bottom of the combiner
box. It is recommended to be within 10cm. The shorter the better, the thicker the better. The bottom of
the combiner box should be connected to the ground. The main control unit module is fixed on a
standard guide rail with a width of 3.5 cm.
The wiring specification of the communication shielded wire is shown in the figure below:
The wiring of on-site communication lines requires that the communication shield can only be
grounded at a single point, otherwise there will be a risk of lightning surge damage to all equipment
on the entire communication line during a lightning strike;
If you encounter a situation where communication line interference is too large to communicate,
you can refer to the figure above, and insert a high voltage capacitor C <100nF between the shielded
wire of each combiner box and the ground wire, and use this capacitor to filter the shielding layer
interference.
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5 UI introduction
5.1 Key operation
FR-DCMG-MMPS has four keys "ESC", "-", "+", and "SET".
"ESC" key is used to return to the default interface and cancel parameter settings;
"SET" key is used to enter the parameter setting mode, select the parameter to be set and complete
the setting of the parameter;
The"+"and "-" keys are used to scroll the screen and adjust parameters;
Press the"+"and "-" keys at the same time to display the software version interface;
Press the "ESC" and "-" keys simultaneously to display the current calibration interface;
Press the "ESC" and "+" keys simultaneously to display the trip self-test interface;
If there is no key operation for 10 seconds, the interface will automatically jump to the default
interface of the current mode, and the brightness will decrease after 5 seconds.
5.2 Boot interface
After the device is powered on, the following interface will be displayed:
5.3 Current interface
After the boot interface, the histogram interface will be displayed, as shown below:
①It indicates that the connected Hall has the arc detection function, and the ordinary Hall does not
have this mark;
②The number of online current channels varies according to the number of Halls actually
connected;
③Switch input status: DI1, DI2, DI3, DI4 real-time status;
④Real-time temperature;
⑤No voltage displayed when PV+/PV- is not connected;
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