BLUE JAY GYDCG-UBC1-HRLZ DC Insulation Monitor Device Instruction Manual

June 10, 2024
BLUE JAY

BLUE JAY GYDCG-UBC1-HRLZ DC Insulation Monitor Device Instruction Manual
Insulation Monitor Device

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).

Ports and functions

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 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 Current

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.

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
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.
Configuration bit

Wiring Method

Wiring Method

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.

Structural Parameters

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)
Structural Parameters

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:

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.

Write operation function code 0x06: Writes a single register

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

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

Write operation function code 0x06: Writes a single register

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

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 polynomial: X^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.

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
  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.

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.

References

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