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FAQs Library
Q
How to control the inverter via mobile phone Bluetooth?
2020-10-15
A

GD350 needs to be equipped with a Bluetooth card, scan the QR code on the inverter, download and install INVT Workshop, and open the mobile phone Bluetooth to connect to the inverter. See the video link below for more steps.

https://www.youtube.com/watch?v=zkC-eGiBJ8I

Q
How to control theGD350 through Wifi?
2020-10-15
A

GD350 needs to be equipped with a Wifi card, scan the QR code on the inverter, download and install INVT Workshop, and open the mobile phone Wifi to connect to the inverter hotspot. See the video link below for more steps.

Q
How to adjust the output power of GD350 high power model with synchronous motor?
2020-10-15
A

Set vector 0 mode. Output power calculated by formula P = UI * cos φ * 1.732
Change P02.01 = 560kw, although it is the parameter of asynchronous motor, the synchronous machine algorithm is calculated according to the power of asynchronous motor.
Change P02.18 = 400V, and force the voltage parameter to 400V.
Change P03.24 = 110% and adjust the maximum voltage limit to 110%.
You can also change P02.28 and display parameters.
Or change P08.41 over modulation, into depth modulation, do not change until absolutely necessary, will have an impact on the wave.

Q
How to solve the OUT fault of GD300?
2020-10-15
A

This is the most common fault. Inverter three-phase output UVW phase maybe short circuit phenomenon, or external electrical equipment interference, or IGBT,IPM module is damaged.

Q
How to solve the problme of GD300 overload fault?
2020-10-15
A

1) The mechanical load is too heavy, its main feature is that the motor is hot, touching the motor shell by hand, which is obviously hot; it can also read the running current from the inverter display screen, compare with the rated current of the motor, and judge the overload situation.

2) Three phase voltage unbalance
The operation current of a certain phase is too large, resulting in overload trip. Its characteristic is that the motor heating is unbalanced, and it may not be found when reading the running current from the display screen (because many inverter displays only one phase current); the effective method is to measure the three-phase output voltage of the inverter with a voltmeter, so as to judge whether the inverter is lack of phase or voltage imbalance.

3) Misoperation
The internal current detection part of the inverter breaks down, and the detected current signal is too large, resulting in overload trip

Q
How to prevent lightning for GD300 inverter?
2020-10-15
A

Lightning is divided into direct lightning and induction lightning. Direct lightning is the lightning directly falling on the lightning objects, causing the greatest damage; induced lightning is the induced high voltage generated by the electromagnetic wave generated by lightning on the conductor, which makes the electrical appliances connected to the conductor over-voltage and damage.

In the power grid, multi-stage lightning arresters have been installed, but the residual voltage of the former stage lightning or the lightning induced voltage near the inverter will still cause damage to the inverter.

Solution: install lightning arrester in inverter control cabinet.

The incoming line arrester can adopt power lightning protection module, slide installation and parallel grounding. The arrester module is gap discharge, the impulse discharge current is 15kA (10 / 350 μ s), and the working voltage is 250V. It is also possible to use parallel varistor in the power line for lightning protection.

Q
What is the difference between DBU and RBU?
2020-10-15
A

The DBU is a braking unit and requires an external braking resistor. When the motor have regenerative energy, the DBU detects that DC bus voltage rises and consumes the feedback energy on the braking resistor.

RBU is an energy feedback unit. When RBU detects an increase in DC bus voltage, it will feedback energy back to the AC grid instead of dissipating energy to the resistor. When the motor generates feedback energy, DBU or RBU must be selected, otherwise the inverter will report an OV fault.

Q
What is the function of the output reactor?
2020-10-15
A

Effectively suppress the instantaneous high voltage during IGBT switching and increase the effective transmission distance of the inverter.

Q
What is the function of the input reactor?
2020-10-15
A

Reduce surge and peak current, improve power factor, suppress grid harmonics, and improve the effect of input current waveform.

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