1. Check whether the motor is connected before auto-tuning to ensure that the motor has been correctly connected with the VFD.
2. Check whether the motor capacity matches the VFD capacity. If the VFD capacity is too small, suggest to replace the VFD matching the motor capacity.
3. Check whether the motor rated parameters are set correctly to ensure that the motor rated parameters have been set correctly before auto-tuning.
4. Check whether the auto-tuning parameters of the VFD deviate too much from the actual values. Users can do auto-tuning for several times and take the closer parameters.
1. Determine whether to restart the rotating motor. If so, consider restarting the motor after it stops stably or setting the speed tracking to be effective.
2. Check whether the acceleration time of the VFD is too short, and extend the acceleration time with the permission of the user.
3. Check whether the output voltage is low when at 60 Hz, and adjust the motor no-load current to make the output voltage reach 460V.
4. Check whether the current displayed on the keypad is consistent with the actual current. If so, it is recommended that the customer replace the higher power VFD.
5. Check whether the VFD model is set correctly (whether it corresponds to the load type, if not, reset the model).
1.check whether the rated parameters of the motor are set correctly. If not, please reset.
2. Check whether the output voltage of the VFD is 460V when the frequency is 60Hz. If not, please adjust the no-load current to the normal status.
3. Check whether the motor has locked rotor, if so, try to eliminate it.
4. Check whether the current displayed on the keypad is consistent with the actual measured current. If it is consistent, it indicates that the motor selection is too small. It is recommended that the customer replace the motor with a higher power.
1. Determine whether to restart the rotating motor. If so, you can wait until the motor stops stably or enable the speed tracking function.
2. Check whether the acceleration time of the VFD is too short or not, and extend the acceleration time. If the process of the customer allows, advised to replace the inverter with a higher power VFD.
3. Confirm whether the load of VFD changes suddenly during acceleration. If so, the protection value or acceleration time can be increased.
4. Check whether the output voltage is low while at 50Hz, and adjust the no-load current of the motor to make the output voltage reach 380V.
5. Check whether the output cable is too long. Generally more than 50m, output reactor or filter should be installed; generally, reactor should be added to submersible pump, and OC1 is easy to trip without reactor.
6. Check motor insulation.
Possible causes of failure:
1. The short-circuit connection jumper between terminal 24 V and PW is lost;
2. The voltage of terminal 24 V is abnormal;
3. The terminal is damaged;
4. The terminal polarity is set incorrectly;
5. Some parameter setting is improper, please reset to factory parameters, then test.
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".
Switching the multimeter to Diode position and test as follows:
1. Set the multimeter to Diode position, connect the black hand with "+", then connect the red hand with R、S、T、U、V、W in order, if all the values is between 0.3--0.5V, both the rectifier and IGBT upper bridge are good.
2. Contrary, connect the red hand with "--", then connect the black hand with R、S、T、U、V、W in order, if all the values is between 0.3--0.5V, both the rectifier and IGBT lower bridge are good.
If the test values is highly unbalance, the rectifier or the IGBT must be broken. And you can't power on in this situation.
More details, please see the attached file.
Notice: Please make sure that the inverter no power, so we call it static test.
There is a fuse on the 24 V auxiliary power board, this board will provide power for fan and soft-start contactor. If the fuse damaged, the 24V auxiliary power board will not output 24V power supply, in this case, contactor isn't close, the drive still trying to start with the resistor in the circuit, there will have a big current through resistor. But in most cases, it will not burn up, because our VFD has protection for that. I will explain more: when the power goes into VFD through soft-start resistor replace of contator, the resistor will act as an Partial voltage resistance in the whole voltage range, for example, from DC 540V goes down to 350V, our VFD will report "UV" under-voltage fault, to protect the soft-start circuit. In very few cases, the VFD don't have time to protect while during voltage from DC 540V goes down to 350V.
Sometimes, the resistance shell is cracked due to heating, its inside resistor may not be broken, I supposed that. You can use a multi-meter to test the resistor value is 20Ω or not.
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