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When DC bus voltage reduce, VFD reduce the output frequency to ensure the output torque. P27.02=1 active protection, if DC bus voltage is less than P27.03*513VDC, reduce the output f. f/hz=rated Hz*Current DC bus voltage/rated DC bus voltage.

When DC bus voltage reduce and reach the set point, VFD DEC. stop and display A-LvP fault. Until DC bus voltage back to P27.01*motor rated voltage + 20Vdc, reset automatically.P27.00=1 active lower voltage protection.

Graded multi-step speed is special for GD20-09, different from multi-step speed function of universal purpose series. Only all lower graded step is ON, the high graded step is avlid.

Active function by P19.37=1, P19.37 can be used together with P05 group input terminal function 60 (Operating lever zero-point position signal) to conduct operating lever zero-point position detection. When the VFD stops, if the operating lever zero-point position signal is enabled (operating lever zeroing), timing starts. At this moment, if operating lever upward or downward running command exits, the VFD does not respond to the command, but  if P19.38  is reached, an operating lever  fault  (StC)  will be reported. If the counting time reaches P19.38, it indicates that the zero position is detected uccessfully.  The zero position signal  is released, and  the VFD responds only after being given with  the operating lever  upward/downward command. In the situation that the zero position signal is not  released, if the operating lever upward/downward command is given, an  operating lever fault  (StC)  will be reported. After the VFD stops, the operating lever zeroing starts timing andlasts until P19.38  is reached. Valid running command can be given again only when the zero position is detected successfully.

Generally, it is caused by improper cooperation between the brake and the VFD. The frequency of the VFD has increased, but the brake is opened slowly, resulting in excessive current. This problem is particularly easy to occur in the site where the brake is not controlled by the VFD. The best solution is that the brake is controlled by the VFD.

The main reason is that when the motor is in the power generation state, the motor feeds back energy to the inverter to raise the DC bus voltage to the limit value. It is necessary to check whether the braking resistance or braking unit is damaged or works normally.

Increase the closing delay time of the brake to ensure the continuous output of the VFD during the closing action of the brake.

The motor is weak during operation, and the motor shaft can be easily blocked and stopped.

The multi-point VF function is used to improve the output voltage, increase the output torque and solve problems. For example, the frequency and voltage settings are as follows: 40Hz, 15%; 200Hz，58%； 320Hz，88%

Recently a customer noticed that the inverter was spinning in the opposite direction (than adjusted) after a start command was given. The customer has not made any changes to the inverter configuration, no additional disturbances have occurred.
After restarting the inverter works for 1-2 hours correctly, then the error repeats. Interestingly, several other inverters configured identically, work fine. Application: conveyor belt.
In some cases, if the running direction had been changed, perhaps the load is too heavy, inverter be dragged backwards, this is the possible reason.We know that you have several inverters in same application with same motors, but please be informed that the load is different from different goods or quantity on the belt, so that means maybe you think the application are same, the ability of inverter is same, but the load is different. We suggest that please check the load, to see whether that problem one's load is bigger than other sites in some time. And please use vector control mode, set inverter to "P00.13 Forbid to run in reverse direction".