• Model: GYDCG-UBC1 Series (Small Model, Single DC Channel)
• Version: 1.14
• Power Supply: DC
• Communication Interface: RS485
• Country of Origin: China

Product Usage Instructions

1. Power Supply Check: Before turning on the power supply, ensure that it is within the specified range for the instrument.
2. Installation:
   • Ensure the current input terminal is non-open and the voltage input terminals are not short-circuited during installation.
3. Communication:
   • Avoid applying high pressure on the communication terminal (RS485).
   • Ensure instrument wiring aligns with internal system settings.
   • For communication with a PC, verify that instrument communication parameters match those of the PC.

• Q: What should I do before turning on the power supply?
  A: Check that the power supply is within the specified range for the instrument.
• Q: How should I install the GYDCG-UBC1 Series?
  A: Ensure the current input terminal is non-open and the voltage input terminals are not short-circuited during installation.
• Q: What precautions should I take during communication with a PC?
  A: Make sure that the instrument communication parameters are consistent with those of the PC.

Read me
When you use GYDCG-UBC1 Series, be sure to read this user manual carefully, and be able to fully understand the implications, the correct guidance of operations in accordance with user manual, which will help you make better use of GYDCG-UBC1 Series, and help to solve the various problems at the scene.

1. Before turning on the power supply, be sure that the power supply within the provisions of the instrument;
2. When installation, the current input terminal must non-open, voltage input terminals must Non-short circuit;
3. Communication terminal (RS485) is strictly prohibited to impose on high pressure;
4. Be sure the instrument wiring consistent with the internal system settings;
5. When communicating with the PC, instrument communication parameters must be consistent with the PC.

• Please read this user manual carefully
• Please save this document

SUMMARIZE

The GYDCG-UBC1 Series model product is an efficient insulation monitoring device designed for car charging piles. It can monitor the insulation condition of the DC power system of the car charging pile in real time, detect and alarm any potential insulation failure in time, so as to effectively prevent the occurrence of fire and safety accidents. Users can realize the start and stop of a certain insulation monitoring and the acquisition of values through RS485 communication.

This product has the characteristics of high reliability, easy installation, and convenient use. It is one of the important equipment to ensure the safe and stable operation of car charging piles. In addition, the monitor can also provide effective information about the charging pile power system through data analysis and processing, and provide an important reference for operation management and maintenance.

The product can send communication frames through RS485 to turn on or off the insulation monitoring function. After the insulation monitoring function is turned on, the high-voltage grounding switch K is closed and the real-time measurement of insulation resistance is realized. After the insulation monitoring function is turned off, the high-voltage grounding switch K is disconnected. The host can send read command to read the insulation resistance value of positive and negative poles at any time.
FEATURES 

• Remote monitoring and management
• Monitor positive and negative poles
• Ground insulation resistance
• DC voltage monitoring
• Vehicle side DC voltage monitoring
• Voltage reverse polarity alarm

APPLICATIONS

• DC capacitor discharge
• Guarantee the safety and stability of charging
• Improvement of the efficiency and charging quality
• Personnel and equipment security

 TECHNICAL PARAMETERS

Basic parameters 

Other parameters

Pressure point	Maximum voltage rating	Time
D+/D-TO GND	3000VDC/2500VAC	1min
Power supply+/- TO GND	3500VDC/3000VAC	1min
RS485 A/B TO GND	3000VDC/2500VAC	1min
V+N-TO GND	3000VDC/2500VAC

Notes:

1. Modules without discharge function need not be connected with external discharge resistance;
2. Without vehicle side voltage measurement, there is no need to connect the DC voltage V+ and V- on the vehicle side.

Details refer to Chapter 5.

The LED display
After the module is powered on, the PWR indicator is on. When the insulation monitoring is power on, the “L 1” light is on, and when the insulation monitoring is power off, the “L 1” light is off.

COMMUNICATION INTERFACE

Connection for RS485
In RS485 communication system, this IMO module works in slave mode. Baud 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.

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 5,6 bits are used to set the parity check. The setting mode is shown below.

 Communication Protocol
GYDCG-UBC1 series adopts custom Modbus protocol. Except for sending address command is variable. CRC is obtained according to the actual calculation, register data are defined and unchanged. Described as following:

Write operation function definition (FunctionX02): Writes a single register (No slave response)

Definition 1

• Enable insulation monitoring function (ground relay is closed)

Host inquiry:
Addr. 02 00 02 10 20 CRC CRC  (No slave response)

Definition 2 

• Turn off insulation monitoring function (ground relay is disconnected) Host inquiry:
• Addr. 02 00 02 10 00 CRC CRC  (No slave response)

Definition 3 

• Open discharge (for products with discharge function, the discharge will be automatically closed)

Host inquiry:
Addr. 02 00 02 10 0C CRC CRC  (No slave response)

Command example: 

1. Enable the insulation monitoring function
   Host inquiry:
   1 0 02 00 02 10 20 D6 93
   (No slave response)
2. Turn off insulation monitoring function
   Host inquiry:
   10 02 00 02 10 00 D7 48
   (No slave response)

Read data definition (Functionx01) 

Definition 1 

• Read DC voltage, positive and negative insulation resistance
• Host inquiry:
• Addr. 01 02 03 04 05 CRC CRC
• Slave response:
• 02(H): Status word height bytes (Correspondence Address) 02(L): Status word low bytes
• 03(H): De voltage high bytes
• 03(L): De voltage low byte
• 04(H): Positive insulation resistance high bytes
• 04(L): Positive insulation resistance low bytes
• 0S(H): Negative insulation resistance high bytes
• 0S(L): Negative insulation resistance low bytes
• CRC: According to actual calculation
• CRC: According to actual calculation

Notes:
Only when the DC voltage is between 1 00V~1 000V, Insulation resistance monitoring can be realized. If DC voltage is low than 100V, or it is turned on within a short time, the insulation resistance read is 0xFFFF (means invalid number).
If the read insulation resistance value is a valid number, the insulation resistance value monitoring range is between 1 KO~1 OMO. When the measured value is greater than 1 OMO, the value received by the communication is 0xEA60 (means infinity).

Command example:

Host inquiry:

• 1 0 01 02 03 04 05 oc 30 Slave response:
• 10 30 01 F4 EA 60 00 32 74 03 Definitions:
• 02H: Data=0X1030, indicate: the mailing address is 10H;
• Bit4 =1 indicates that the module is working and can be queried.
• 03H: Data=0X01 F4=500, indicate: the DC voltage is 500V.
• 04H: Data=0XEA60=60000, indicate: the positive insulation resistance is infinite.
• 05H: Data=0X0032=50, indicate: the negative insulation resistance value 50K

Definition 2  Read vehicle side voltage

• Host inquiry:
• Addr.01 02 FF 08 09 CRC CRC
• Slave response:
• 02(H): Status word height bytes (Correspondence Address) 02(L): Status word low bytes
• 00(H): FF
• 00(L): FF
• 08(H): Vehicle side voltage high byte
• 08(L): Pile side voltage high byte
• 09(H): 00
• 09(L): 00
• CRC: According to actual calculation
• CRC: According to actual calculation

Command example:

Host inquiry:

• 10 01 02 FF 08 09 C9 05
• Slave response:
• 10 30 FF FF 01 90 00 00 70 CE

Definitions:

• 02H: Data=0X1030, indicate: the mailing address is 10H;
• Bit4 =1 indicates that the insulation monitoring of the module is complete and can be read.
• 08H Data=0X0190=400, indication: the DC voltage on the side of the vehicle is 400V.

 02H Indicates the meaning of the status word 

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