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FAQs Library
Q
How to solve the problem that no display when the VFD is powered on?
2020-10-15
A

If the DC power indicator is on, the possible causes are: the keypad is damaged or the keypad cable is not in good contact, so the keypad and keypad cable can be replaced for testing; if the power board is damaged, replace the power board; if the main control board is damaged, replace the main control board; if the DC power supply is not enough, that means the input power supply may not be connected; or the rectifier is damaged; or the fuse is damaged.

Q
What should to do when GD20 uses high power model to control small power motor?
2020-10-15
A

It's better not to exceed the third levels for the big drive control small motor. The main reason is that the self-learning of motor parameters is not accurate, and VF will be better. But our VF is vectorized, which is also related to the motor parameters. So please use VF control, try to get rid of the influence of vector control, please start from the following directions:
(1) The rated parameters of the motor are set correctly
(2) Set the slip compensation factor P04.09=0
(3) Adjust the low speed and high-speed oscillation suppression factor properly, generally to set it bigger (fine-tune), to see the effect
(4) Carrier frequency can be increased, such as 2K ~ 4K

Q
Why is the function of GD20's S terminal invalid?
2020-10-15
A

There are below possible reasons, please check one by one.
1. There is no short circuit jumper between + 24 V and PW on the terminals;
2. The + 24 V power supply on the terminal is abnormal, please test;
3. If only one digital terminal is invalid, that means the circuit corresponding to that terminal is damaged, other terminals can be used for test;
4. The terminal polarity is set incorrectly;
5. The function parameters of the corresponding terminals of VFD are set improperly, please check the parameters.

Q
How to solve the problem of GD10's LED keypad showing "8.8.8.8.8" while power on?
2020-09-23
A

The possible causes of this failure are:
1. The keypad is damaged or the keypad cable is not connected properly, so the keypad and keypad cable can be replaced and powered on again;
2. If the control board fails, the control board can be replaced and powered on again;
3. The connection line of the drive board is not in good contact, so it can be re connected and powered on;
4. The power supply of the drive board fails, and the power supply of the drive board can be replaced.

Q
How to solve GD10's overload problem?
2020-09-23
A

In the operation of the motor, the running current exceeds the rated value but is less than the over-current limit value, and the operation time is longer, which is called overload.

The basic characteristics of overload are: Although the current exceeds the rated value, the excess amplitude is not large, and generally does not form a large impact current (otherwise, it will become an over-current fault). Another significant feature of overload is that there is a time accumulation process. When the accumulation time reaches, the overload fault is reported.

Solution: Check the VFD's power/current is bigger than the load or not.

Q
How to solve the problem that inverter interferes with external equipments?
2020-09-23
A

Make sure that the grounding is good. And use shielded cables, separate power cables and control cables, or add EMC filters or magnetic rings.

Q
How to solve GD10's overvoltage problem?
2020-09-23
A

The motor is mainly caused by the formation of over-voltage as long as the speed of the motor is bigger than the inverter's output speed, the motor will produce a power generation effect, charging the inverter. In engineering, the inverter over-voltage phenomenon is complicated, but we follow the motor as long as there will be a power generation effect, external energy interference, as long as to find out the interference to the motor, the problem is solved. Negative pressure, the formation of cavitation phenomenon, the negative pressure of the water from the frequency conversion pump inhalation, driving the impeller rotation, so that the motor speed is higher than the inverter output speed, motor power generation.

Solution: add braking units and resistors on the inverter.

Q
How to solve the problem of OV or OC when GD10 drives large inertia load deceleration?
2020-09-16
A

GD series inverter is used in driving large inertia load, such as centrifuge, sanding machine, fan and so on. The load is consistent with the rated parameters of the inverter, that is, some OV or OC faults will be reported during deceleration. If you encounter these elements: speed mode, large inertia and deceleration alarm failure, then try to change P04.09 to 0, which can basically solve most of the problems.

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