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FAQs Library
Q
GD20-EU will turn on the fan as long as it is running, how to stop the fan?
2020-11-10
A

There are two ways: by setting P08.39 function code or combining with sleep function. For example, set P00.05=1, P01.19=2,P05.01=1. S1 is the forward rotation (Zero speed) and S2, S3, S4 multistep speed,S1 is always bridge with the GND and the fan is always in operation. Use S1 and GND to stop the fans. P01.19 turn to 2 and the lower Hz will be 1Hz. Then the inverter when goes to 0 goes to sleep mode.

Q
Why run GD20UL, but the motor doesn't run?
2020-11-10
A

The motors, wires or inverters are damaged, the wires are not connected properly. Or the function settings are improper. For example, the setting of upper limit frequency, lower limit frequency, basic frequency and maximum frequency set incorrectly. When using external control, there are no pre-settings and other unreasonable settings.

Q
How to debug GD35 with servo motor for position control?
2020-11-02
A

GD35 with servo motor is to first understand the encoder type of servo motor, select the matching GD35 inverter model, 50Hz corresponding voltage, back EMF and pole number and other parameters. P20.11 do autp-tunning of magnetic pole position. Change P21.00 to 1 position control pulse train setting. In addition, P20.13 is changed to 0 disable, the current loop of P03.09 can be increased by about 1500. "

Q
What models can the GD20-EU's keypad be used for?
2020-11-02
A

INVT LED keypad can use for different series.Big LED keypad and small LED keypad can't be used for each other.
Small keypad series:GD10&GD20%GD100-PV&BPD
Big keypad series:GD200A&GD300&GD35&GD350&GD350A

Q
How to solve the problem of GD20 overheating problem?
2020-11-02
A

Overheating is a common fault. When encountering this kind of situation, we will first think about whether the cooling fan is running, whether the fan is blocked, whether the ambient temperature is too high, the inverter is not well ventilated, and the temperature detection circuit is faulty.

Q
How to use GD35's big power model to control smaller motor?
2020-10-28
A

For P00.00 = 1,  SVC1. As you know, the motor's power is too small, compared with inverter, the range is too big. So my suggestions for user's reference.
After auto-tuning, try to adjust P02.07 and P02.08's value a little smaller, don't adjust too big, and see the performance.  Or adjust P03.03 a little smaller, 18, 15, see the performance.
Rotor resistance does not affect the output voltage, but it will make the speed identification worse, which will result in higher or lower actual speed (bigger rotor resistance) or smaller rotor resistance (smaller rotor resistance), too large rotor resistance will also cause control instability, too small rotor resistance may cause insufficient output.
Large leakage inductance parameters may lead to current oscillation.

Q
How to adjust GD20-EU's carrier frequency in the parameters?
2020-10-28
A

The carrier frequency is an important parameter for the VFD operation. If increase it, the output waveform will be better and the electromagnetic noise will be smaller, but it will increase the inverter's operating temperature, poor heat dissipation, and greater leakage current. The factory default parameters have been reasonably set, and adjustments are not recommended. If it is adjusted larger, the inverter needs to be derated for use. For every additional 1k, derate by 10%.

Q
Why use GD20UL to drive the motor, consumes more electricity instead of saving energy?
2020-10-28
A

The inverter itself needs to consume a part of energy. The inverter has a soft start function, which can reduce the starting impulse current of the motor; the frequency can be adjusted to realize the motor speed regulation. When using a inverter, the motor has been working at the rated frequency. In this case, energy saving cannot be achieved. When the water pump or fan is driven by frequency conversion, it can replace the valve to adjust the flow, which can save energy.

Q
How does GD20UL use multi-step speed function?
2020-10-22
A

For example, the parameters are set as follows:
P00.01 1 Terminal control
P00.06 6 Multi-speed setting
P01.18 1
P01.21 1
P05.00 1 HDI selection
P05.01 16 S1
P05.02 17 S2
P05.03 18 S3
P05.04 19 S4
P05.09 1 HDI speed terminal
P10.04 40% S1 on, 20Hz
P10.08 60% S1+S2 on, 30Hz
P10.16 80% S1+S2+S3 on, 40Hz
P10.32 100% S1+S2+S3+S4 on,50Hz

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