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FAQs Library
Q
How to judge the damage of GD35 fan?
A

(1) Measure whether the fan power supply voltage is normal. If the fan power supply is abnormal, repair the fan power supply first;

(2) After confirming that the power supply of the fan is normal, if the fan does not rotate or runs slowly, the fan has failed and needs to be replaced.

Q
How to solve the GD20-EU's overcurrent (OC) issue?
A

This is probably the most common fault in the inverter. First of all, we need to eliminate the fault caused by parameter problems.

For example, current limitation and too short acceleration time may lead to over-current. Then we must judge whether there is something wrong with the current detection circuit, such as Hall sensor, hall cable fault. Whether the output side of inverter is short circuited.

Q
Can GD20UL be used to realize variable frequency speed regulation for ordinary motors?
A

Ordinary motor can realize speed regulation by GD20UL and INVT other series VFD, but it is not recommended to use it under low frequency (30Hz) for a long time to avoid temperature rise.

Q
How to judge the damage of GD20UL's electrolytic capacitor?
A

The poor quality of electrolytic capacitor has the following characteristics: leakage of liquid, high leakage current, high loss, heating, bulging, cracking, combustion caused by explosion, capacity reduction, and increase of internal resistance and inductance. For the filter electrolytic capacitor, because of its high voltage, large capacity and large energy, it is easy to cause leakage, explosion and combustion. Electrolyte is combustible and can cause combustion accident. Therefore, it is necessary to use a good quality electrolytic capacitor and replace it with a new one before reaching its service life.

Q
What's the protection level of the MVD GD5000?
A

Standard protection level is IP30, non-standard can meet IP41

Q
How to set lower speed limit in solar pumping controller?
A

Only need to set P15.05 lower frequence of PI output,no need to set P00.05.

Q
Why GD35's varistor damaged?
A

The varistor was originally used as a protective device to absorb the over-voltage of the incoming line. However, when the voltage at the inlet side is continuously high and the performance of the varistor changes, the varistor may explode and burn, and the insulation of the surrounding devices and wires may also be affected.

Q
How to solve GD20-EU's over voltage (OV) problem?
A

First of all, we hneed to eliminate the fault caused by the parameter problem. For example, the deceleration time is too short, and the over-voltage caused by regenerative load (add braking unit), then we can check whether there is a problem with the voltage at the input side. Finally, we can see whether there is a fault in the voltage detection circuit. Generally, the voltage sampling point of voltage detection circuit is the voltage of intermediate DC circuit.

Q
What is different between GD20-EU and GD200A?
A

GD20-EU is mainly oriented to the economic OEM market, support STO function, with - S2, - 2, - 4 products, with the current maximum power of 110KW; 18.5kw and above are equipped with built-in DC reactor as standard, and the built-in brake unit can reach 110KW (45~110KW is optional). The product volume is small and only G-type machine is available. It can not expand communication and does not support LCD keypad. (sticked keypad scheme for models below 2.2kW). GD200A series, general transmission market products, 380V voltage level, support G/P dual rating; non expandable communication, optional LCD keypad. (sticked keypad scheme for models15kW and below).

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