Fonrich FR-DCMG-MMPS Manuale utente
User Manual
Version 1.1
DC System Monitor：FR-DCMG-MMPS
丰郅（上海）新能源科技有限公司
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
1
Table of Contents
Documentation statement....................................................................................................................................1
Product description...........................................................................................................................................2
The main function.......................................................................................................................................2
Optional module..........................................................................................................................................3
Terminal description ...................................................................................................................................4
(Optional) PLC expansion module terminal description..............................................................................5
Ground connection and RS485 communication shielded wire....................................................................6
Wiring diagram of monitoring module.............................................................................................................7
(Optional)PLC system network wiring diagram ..............................................................................................8
System diagram..........................................................................................................................................8
Network diagram.........................................................................................................................................9
Networking diagram of the gateway in the inverter.....................................................................................9
Networking diagram of the gateway in the junction box..............................................................................9
PLC wiring in combiner box and inverter..................................................................................................10
UI introduction .................................................................................................................................................11
Key operation ...........................................................................................................................................11
Boot interface ...........................................................................................................................................11
Current interface.......................................................................................................................................11
PLC status interface .................................................................................................................................12
Initial interface display ..............................................................................................................................12
Detailed data interface of channel current and power generation.............................................................12
Parameter settings....................................................................................................................................13
Trip self-test setting interface....................................................................................................................14
Current calibration setting interface..........................................................................................................15
System information display interface........................................................................................................15
Alarm status display interface...................................................................................................................16
DC arc fault alarm interface......................................................................................................................16
Fault alarm clear interface........................................................................................................................16
Alarm information management.....................................................................................................................17
Items that can generate alarms can be set...............................................................................................17
Items that can be tripped by setting..........................................................................................................17
Alarm conditions.......................................................................................................................................17
Alarm message.........................................................................................................................................18
Arc Alarm Strategy....................................................................................................................................18
MODBUS Protocol definition ..........................................................................................................................19
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Communication format configuration ..............................................................................................19
Data frame format description (refer to Modbus RTU standard)......................................................19
Function code description...............................................................................................................19
Register description........................................................................................................................20
Register description in bit units (function code 02)..........................................................................20
Register description in word unit (function code 03 04 06)..............................................................30
PLC register: ....................................................................................................................................................37
Function code 03......................................................................................................................................37
Function code 06......................................................................................................................................42
The data of PLC node 1 is as follows, the data of other nodes are similar: .............................................43
Appendix ..........................................................................................................................................................45
FAQ..........................................................................................................................................................45
Document revision record.........................................................................................................................46
Contact us ................................................................................................................................................46
1
Documentation statement
This manual is applicable to the products with the models of FR-DCMG-MMPS. The software version
is the monitoring module of version A088 and above; this document also contains the description of
the optional product PLC.
2
Product description
FR-DCMG DC monitor products are mainly used in DC power transmission and distribution, such as
photovoltaic combiner boxes, DC cabinets, telecommunications equipment rooms and
communication base stations. It communicates with host computer through RS485 or power line
carrier(PLC). Its main function is to monitor the current of each branch in the DC system, the bus
voltage, the temperature of the cabinet, the status of the lightning arrester and the status of the DC
breaker. It can realize automatic alarm for abnormal conditions and real-time detection of the
presence of harmful arcs in the DC circuit. Once there is a harmful arc, it will immediately send an
alarm signal to directly drive the trip unit and cut off the faulty circuit, thereby effectively preventing
safety risks such as fire caused by arc.
The main function
•
Monitoring function: Real-time monitoring of the generation current, voltage, temperature of
the combiner box, lightning arrester 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 or PLC.
•
Display content: For the detected voltage, current, temperature, switching state, power
generation and other data, the FR-DCMG-MMPS can display a histogram interface through
the LCD to read the current and other data more intuitively.
•
Alarm function: It can be configured to open or close the alarm and shunt release functions
according to the actual needs of the site (by default, only the arc alarm and trip functions are
enabled). When an alarm occurs, an alarm message will pop up on the interface.
•
Current calibration: identify zero drift and improve the accuracy of current identification.
(Default off)
•
Trip mode switching: The default o +, o- voltage is 0v, and the voltage output is 24v when
tripped. It can also be set to the opposite application.
•
Power line carrier communication module: through the power line carrier expansion module
DC-DCMG-PLCx, to achieve communication of up to 24 nodes
•
Compatibility:Program compatible model FR-DCMG-MMPD products
3
Optional module
Type
Model
Description
Optional: expansion
module
(PLC communication)
FR-DCMG-PLCD
power line carrier(PLC) expansion module for
1000V and below systems, needs to be used
with FR-DCMG-MMPL
FR-DCMG-PLCU
For 1500V and below systems
4
Terminal Definition
Symbol
Meaning
PV+ . PV-
PV DC bus power supply terminal
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
0+.0-
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
DC 24V power supply terminal, bidirectional power supply, external
output current maximum 100mA, but it is not recommended to use the
module for external power supply, which will affect the internal
temperature rise of the module
5
(Optional) PLC expansion module terminal description
Symbol
Meaning
PLCx PV+ . PV-
PLCx expansion module DC power terminal
6
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 specifications of the communication shielded wire are shown in the figure above:
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.
7
Wiring diagram of monitoring module
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