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First of all, ensure that the wiring is correct. HMI and GD300-21 are connected through RS485 interface, please refer to the wiring diagram for correct wiring;
Secondly, check whether the Modbus communication parameters (P14.00~P14.02) of GD300-21 have been modified, usually use the default value.
Finally, you can also enter the HMI setting interface to confirm whether the COM port settings are correct.

You need to select the INVT IoT module. When placing an order, you need to inform the APN address of the mobile phone SIM card operator you are using, and INVT will set it up for you.
IoT connects to HMI.
INVT technical support will open an IoT account for you. You can download visit computer webpage https://iot.invt.com or mobile APP market to download INVT Compressor, log in to your account and bind the IoT module, then you could remotely monitor and set up the air compressor through the network.

For example, use customer pictures, logos, etc.
According to specific project requirements, we can meet customer customization requirements.

The conversion of pressure units is:
1Mpa=10bar
For example, if you want to set a pressure of 8bar, then in GD300-21, it can be set to 0.8Mpa.

On the main screen of HMI, click "Menu"-"User Parameters", enter the required pressure in "Set Pressure", and enter the required temperature in "Set Temperature".

After logging in on the touch screen,
1. "Menu"-"Main Inverter Parameters"-"Fan Inverter Parameters" to set the parameters of the main motor and fan;
2. "System Configuration"-"Motor Parameter Setting"-"System Parameter Setting"-"Debug Mode" to complete the system configuration；
3. Set "User Parameters" and "Protection Parameters".
After ensuring that the air compressor is installed and connected correctly, you can start a trial run.

GD300-21 supports PT100 temperature sensor with two inputs.

All GD300-21 series are equipped with built-in DC reactor as standard, and the power factor can reach above 0.9.

The circulating variable frequency pump is one of the working modes of the GD300-16 HVAC special mode. In the long-term stable operation of the water supply system, the variable frequency pump has been running for a long time, which will affect its service life, and other variable frequency pumps are not involved in operation. In order to prolong the service life of the variable frequency motor, under the stable state of the system, all the variable frequency motors to be started run in turn according to the set cycle.
First, the inverter coast stop, and then controls the lower limit frequency of the cyclic variable frequency motor to be started as the initial set frequency, and superimposes PID1 to adjust the output frequency on the basis of this frequency as the final set frequency to start running, and finish the cycle process.