GYDCG-UBC1-HRLZ DC Insulation Monitor Device
Product Information: GYDCG-UBC1-HRLZ
The GYDCG-UBC1-HRLZ is a DC insulation monitor device (IMD) that
comes in a small model with a single DC channel. It is equipped
with powerful functions such as charging pile voltage measurement,
insulation resistance monitoring, vehicle side voltage measurement,
capacitance charge discharge, and other measurement functions. The
device is compatible with 12V and 24V input and has a power supply
range of 9 to 30V. The insulation resistance monitoring can be
realized in the range of 100V~1000V DC and the precision and speed
of insulation resistance monitoring and voltage measurement are
greatly improved. The device is highly reliable and the insulation
resistance monitoring results will not be affected when the DC
voltage fluctuation changes. All communication parameters can be
set by DIP switch including communication address, baud rate, and
parity check mode.
Product Usage Instructions: GYDCG-UBC1-HRLZ
Ports and Functions
The GYDCG-UBC1-HRLZ has the following ports and functions:
Insulation Monitoring Function
After enabling the insulation monitoring function, the device
continuously monitors the insulation resistance in real-time. The
user can read the insulation resistance value at the earliest 1
second after enabling the insulation monitoring function, and the
longest time is no more than 2.5 seconds. In the case of DC ground
capacitance, the module can realize adaptive monitoring of
grounding capacitance below 3uF (positive and negative ground
capacitance are 3uF respectively). In the case of DC ground
capacitance, the maximum monitoring time is not more than 2.5
seconds. The user can determine whether the current insulation
resistance value is valid by reading Bit1 in register 0x001B. If
the insulation monitoring is off or the DC voltage is less than
100V, or for a short time after it is on, the value of register
0x001B Bit1 is 0. The value of insulation resistance read is valid
only if the value of register 0x001B Bit1 is 1.
LED Display
After the device is powered on, the PWR indicator is on. When
the insulation monitoring is powered on, the ‘L1’ light is on, and
when the insulation monitoring is powered off, the ‘L1’ light is
off.
RS485 Communication
Users can send and receive data frames through the RS485
communication port. The circuit is equipped with 510 terminal
resistance. For details, see 6 Communication Protocol. Terminals
RG, A, and B correspond to the ground cable A and B of the RS485
output.
Communication Parameter Configuration Bit
The communication parameter configuration bit can be set by DIP
switch including communication address, baud rate, and parity check
mode.
GYDCG-UBC1-HRLZ
GYDCG-UBC1-HRLZ
DC insulation monitor device (IMD)
(small model, single DC channel)
Operating instruction
GYDCG-UBC1-HRLZ
1. Powerful functions
Integrated: charging pile voltage measurement + insulation resistance monitoring + vehicle side voltage measurement + capacitance charge discharge and other measurement functions.
2. Wider power supply range
It is compatible with 12V and 24V input, and the input power supply range is 9 to 30V
3. Wider insulation monitoring range
Insulation resistance monitoring can be realized in the range of 100V~1000V DC
4. Faster monitoring accuracy and speed
The precision and speed of insulation resistance monitoring and voltage measurement are greatly improved, and the insulation resistance monitoring results can be obtained within 1 second after opening
5. Higher reliability
The insulation resistance monitoring results will not be affected when the DC voltage fluctuation changes
6. Adaptive capacitance to ground
The insulation resistance monitoring is realized when the ground capacitance of positive and negative poles is less than 0.5uF
7. More convenient parameter setting
All communication parameters can be set by DIP switch (including communication address, baud rate and parity check mode)
GYDCG-UBC1-HRLZ
Catalog
1 The profile…………………………………………………………………………………………….1 2 Ports and functions …………………………………………………………………………………1
2.1 Insulation monitoring function ………………………………………………………….1 2.2 The LED display…………………………………………………………………………….2 2.3 RS485 communication …………………………………………………………………….2 2.4 Communication Parameter configuration bit ………………………………………..2 3 Wiring Method ………………………………………………………………………………………3 4 Structural Parameters ………………………………………………………………………………4 5 Electrical Parameters ………………………………………………………………………………4 6 Communication Protocol………………………………………………………………………….5 6.2Write operation function code 0x06: Writes a single register …………………..5 6.2Write operation function code 0x06: Writes a single register …………………..6 7 Analysis of common problems and solutions ………………………………………………..8
GYDCG-UBC1-HRLZ
1 The profile
GYDCG-UBC1-HRLZ is a DC insulation monitoring device based on MODBUS protocol, including DC to ground insulation impedance monitoring, DC voltage monitoring, DC voltage reverse connection alarm. It can be used in EV DC charging system, photovoltaic system, energy storage system, DC power grid and other DC systems under 1000V. This product h as the function of insulation monitoring start and stop, insulation monitoring can be real -time monitoring of positive and negative poles to the ground insulation resistance, the monitoring result is not affected by DC voltage changing, is not affected by the positive and negative poles insulation resistance symmetry. (GYDCG-UBC1-HRLZ is a smaller version of GYDCG-UBCH1-LZ).
2 Ports and functions
2.1 Insulation monitoring function
This product can send communication frame through RS485 to enable or disable the insulation monitoring function. After the insulation monitoring function is enabled, the high voltage grounding switch K is closed and the insulation resistance is measured in real time. After the insulation monitoring function is turned off, the high voltage grounding switch K is disconnected. The host can send read instructions at any time to read the positive and negative insulation resistance values respectively from IMD. The insulation resistance monitoring can be implemented only when the DC voltage is between 100V and 1000V. When the DC voltage is less than 100V or the insulation monitoring is not enabled, the insulation resistance monitoring value is 65535 (0xFFFF), indicating an invalid value. The insulation resistance value ranges from 1K to 10M. If the measured value is greater than 10M, the communication receives insulation resistance value of 60000, which is 0xEA60, indicating infinity. The user can turn the insulation monitoring on and off by writing register 0x0102, and determine whether the current insulation monitoring is on or off by reading register 0x001B Bit2. The opening and closing of insulation monitoring only determines whether insulation resistance monitoring is on, and does not affect DC voltage monitoring. After the product is powered, the DC voltage is continuously monitored.
After the insulation monitoring function is enabled, the product continuously monitors the insulation resistance in real time. The user can read the insulation resistance value at the earliest 1s after the insulation monitoring function is enabled, and the longest time is no more than 2.5 seconds. In the case of DC ground capacitance, the module can realize adaptive monitoring of grounding capacitance below 3uF (positive and negative ground capaci tance are
1
GYDCG-UBC1-HRLZ
3uF respectively). In the case of DC ground capacitance, the maximum monitoring time is not more than 2.5s. The user can determine whether the current insulation resistance value is valid by reading Bit1 in register 0x001B. If the insulation monitoring is off, or the DC voltage is less than 100V, or for a short time after it is on, the value of register 0x001B Bit1 is 0; The value of insulation resistance read is valid only if the value of register 0x001B Bit1 is 1.
DC+
DC-
R
R
K
2.2 The LED display
After the module is powered on, the PWR indicator is on. When the insulation monitoring is power on, the ‘L1’ light is on, and when the insulation monitoring is power off, the ‘L1’ light is off.
2.3 RS485 communication
Users can send and receive data frames through the RS485 communication port. The circuit is equipped with 510 terminal resistance. For details, see 6 Communication Protocol. Terminals RG, A, and B correspond to the ground cable A and B of the RS485 output.
2.4 Communication Parameter configuration bit
Dip switch 1 bit is used to set the baud rate, 2 to 4 bits are used to set the communication address, and 5 to 6 bits are used to set the parity check. The setting mode is shown below.
2
3 Wiring Method
Baud rate 119200bps 09600bps
ON
Address 00000H 00101H 01002H 01103H 10004H 10105H 11006H 11107H
GYDCG-UBC1-HRLZ
Parity check 00NONE 01ODD 10EVEN
DP
1 2 34 5 6
The positive DC
The negative DC
D+
BA
D-
RS485
+-
9-30V power supply
G Ground
Modules without discharge function need not be connected with external discharge
resistance; Without vehicle side measurement, there is no need to connect the DC voltage V+ and V- on the vehicle side.
The name of the interface
Connection mode
The name of the interface
Connection mode
D+
DC positive
D-
DC negative
+
The positive pole of power supply
–
The negative pole of power supply
A
RS485-A
B
RS485-B
GND
The system earth
3
4 Structural Parameters
GYDCG-UBC1-HRLZ
The module can be installed by guide rail or screw fixation. Guide rail using standard width 36mm. External dimensions are shown as follows: (Unit: mm)
5 Electrical Parameters
System DC voltage range: 0V~1000V Vehicle side voltage measurement range: 0V~1000V Power supply: 9~30VDC, power 4W Insulation resistance measurement range: 1K~10M (DC system voltage 100V~1000V, within this range, monitoring positive and negative poles to the ground insulation resistance Insulation monitoring accuracy: 3K+5% Measurement accuracy of DC voltage at pile side: 2V+0.3% Environmental parameters: Storage temperature ……………………………… – 40 ~ 125 Operating temperature ……………………………… – 40 ~ 70 Humidity…………………………………………………………… 85% Off-line pressure test <2mA:
4
GYDCG-UBC1-HRLZ
Withstand voltage point
Maximum withstand
voltage class
D+/D- TO GND DC voltage positive and 4200VDC/3000VAC
negative to the earth
+/- TO GND
The power supply is positive 4200VDC/3000VAC
and negative to the earth
A/B TO GND
The RS485 port connects to the 3000VDC/2500VAC
ground
The test of time
1min 1min 1min
6 Communication Protocol
In RS485 communication system, this IMD module works in slave modeBaud rate, communication address, parity check mode, can be set by DIP switch, default stop bit 1, data bit 8. The interval between each byte in the sent frame must not exceed 20ms, otherwise the frame will be cleared.
6.2Write operation function code 0x06: Writes a single register
6.1.1 Request command
BYTE[0] Device address BYTE[1] Function code 0x03 BYTE[2] The high BYTE of the register’s starting address BYTE[3] Register start address low BYTE BYTE[4] High BYTE of register length BYTE[5] Low bytes of register length BYTE[6] Indicates the low value of CRC check BYTE[7] Indicates the high value of CRC check
6.1.2 Response command
BYTE[0] Device address BYTE[1] Function code 0x03 BYTE[2] Register BYTE length BYTE[3] Register high BYTE BYTE[4] Low BYTE in register BYTE[5] Register high BYTE … … BYTE[n] Indicates the low value of CRC check BYTE[n+1] Indicates the high value of CRC verification
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GYDCG-UBC1-HRLZ
6.2Write operation function code 0x06: Writes a single register
6.2.1 Request command
BYTE[0] Device address BYTE[1] Function code 0x06 BYTE[2] The high BYTE of the register’s starting address BYTE[3] Register start address low BYTE BYTE[4] The register parameter is high in bytes BYTE[5] Register parameter low bytes BYTE[6] Indicates the low value of CRC check BYTE[7] Indicates the high value of CRC check
6.2.2 Response command
BYTE[0] Device address BYTE[1] Function code 0x06 BYTE[2] Register BYTE length BYTE[3] Register high BYTE BYTE[4] Low BYTE in register BYTE[5] Register high BYTE … … BYTE[n] Indicates the low value of CRC check BYTE[n+1] Indicates the high value of CRC verification CRC-16 algorithm (RS485) The check data is generated according to the generation polynomial of CRC rules, and the result is added after the instruction as the check code. Generating polynomialX^16+X^15+X^2+1 1. Set the CRC register and set it to 0Xffff. 2. Xor the first 8-bit character of the data with the lower 8 bits of the 16 -bit CRC register, and store the result in the CRC register. 3. Move the CRC register one bit to the right. MSB fill 0, move out and check LSB. 4. If LSB is 0, repeat step 3. If LSB is 1, the CRC register is xor with the polynomial code. 5. Repeat steps 3 and 4 to 8 to complete the shift. At this point an 8-bit data processing is complete.
6
GYDCG-UBC1-HRLZ
Function Register content
Send Example (address 01)
note
code
address
Unit: 0.1V, voltage between
1
0x0010 Bus voltage
01 03 00 10 00 01 85 CF
positive and negative DC
bus
2
Positive insulation
3
0x0012
01 03 00 12 00 01 24 0F
The unit is K, an integer
resistance
Negative insulation
4
0x0013
01 03 00 13 00 01 75 CF
The unit is K, an integer
resistance
Read
version
5
0x001A
03
number
01 03 00 1A 00 01 A5 CD
Read the
Bit1: Insulation resistance
register
monitoring function is
effective.
Bit2: Whether the insulation
monitoring is turn on and
6
0x001B IO state
01 03 00 1B 00 01 F4 0D
the ground switch is closed.
Bit7: DC bus voltage
reverse connection alarm
(position 1 when reverse
connection voltage is above
170V)
7
06
Insulation
01 06 01 02 00 11 E9 FA
Enable
insulation
Write
monitoring
and
monitoring function
the 8 register
0x0102
control Insulation
01 06 01 02 00 00 29 F6
Disable
insulation
monitoring
and
monitoring function
control
9 0xFF
0x 66
The host broadcast reads the slave address
The host sends 0xFF 0x66 0xA5 0xAA 0x2B The slave sends 0xFF 0x66 ADD CRClo CRCHi Add is the mailing address of the slave computer
Example of reply from the slave 0xFF 0x66 0x01 0xAB 0x90 The slave machine address is 0x01
The sample
1. Start insulation monitoring: 01 06 01 02 00 11 E9 FA
Return frame: 01 06 02 00 11 78 84
2, Turn off insulation monitoring: 01 06 01 02 00 00 29 F6
Frame 01 06 02 00 00 B8 88
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GYDCG-UBC1-HRLZ
3, Read the DC bus voltage and positive and negative electrode resistance to the ground (read 4 registers) : 01 03 00 10 00 04 45 CC
01 03 08 13 88 02 58 EA 60 02 58 C8 75 Read the DC voltage 0X1388(500V), the total insulation resistance 0X0258 (600K ), the positive insulation resistance 0XEA60 (infinite), and the negative insulation resistance 0X0258 (600K). 4, Read IO status: 01 03 00 1B 00 01 F4 0D 01 03 02 00 84 B8 27 On behalf of bus voltage reverse connection, insulation monitoring is started ( ground relay is closed), insulation resistance monitoring is turn off. Return frame 01 03 02 00 06 38 46 It means that there is no reverse connection of bus voltage, insulation monitoring is started (ground relay is closed), and insulation resistance monitoring is turn on. 01 03 00 1A 00 01 A5 CD Return frame: 01 03 02 22 01 61 24 The version number is V2201.
7 Analysis of common problems and solutions
1. First send the frame of enabling insulation monitoring function, and then read insulation resistance value. L1 light will be on after startup.
2. After startup, if insulation resistance 0xFFFF is read, it means invalid value, indicating that the module startup process is not complete, you can continue reading at intervals.
3, Ensure that the DC voltage is above 100V, can read the insulation resistance value.
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