INVT GD20-0R7G-4 User Manual (English)

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Goodrive20 inverters

Communication protocol

Figure 2 Chrysanthemum connection applications

Figure 3 is the star connection. Terminal resistor should be connected to the two devices which have the

longest distance. (1# and 15#device)

Figure 3 star connection

It is recommended to use shield cables in multiple connection. The basic parameter of the devices, such as

baud rate and digital check bit in RS485 should be the same and there should be no repeated address.

7.2.2 RTU mode

7.2.2.1 RTU communication frame format

If the controller is set to communicate by RTU mode in Modbus network every 8bit byte in the message

includes two 4Bit hex characters. Compared with ACSII mode, this mode can send more data at the same

baud rate.

Code system

· 1 start bit

· 7 or 8 digital bit, the minimum valid bit can be sent firstly. Every 8 bit frame includes two hex characters

(0...9, A...F)

· 1 even/odd check bit . If there is no checkout, the even/odd check bit is inexistent.

· 1 end bit (with checkout), 2 Bit(no checkout)

Error detection field

· CRC

The data format is illustrated as below:

11-bit character frame (BIT1~BIT8 are the digital bits)

Start bit BIT1 BIT2 BIT3 BIT4 BIT5 BIT6 BIT7 BIT8

Check

bit

End bit

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INVT GD20-0R7G-4 Specifications

General

Model	GD20-0R7G-4
Enclosure Rating	IP20
Output Voltage	0-Input Voltage
Control Method	V/F control, sensorless vector control
Overload Capacity	150% for 60 seconds
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overload, Overheat, Short Circuit, Phase Loss
Communication Interface	Modbus RTU
Rated Power	0.75 kW
Input Voltage	3-phase 380-480V AC
Input Frequency	50/60Hz
Cooling Method	Fan cooling