Repair plan: Hitachi Hitachi inverter speed up trip.
First, the fault phenomenon.
When using Hitachi Hitachi inverters, the phenomenon of speed tripping may occur. Specifically, during the speed increase of the inverter, the motor suddenly stops working, and the inverter panel shows a fault**, such as "e.".th" (overheating) or "e.."oc" (overcurrent).
Second, the cause of the failure.
1.Motor overload: During the speed increase process, the motor is overloaded due to excessive load or mechanical failure, etc., which triggers the overload protection function of the inverter.
2.Short circuit of motor cable or motor: Damage to the motor cable or short circuit inside the motor may cause excessive current in the inverter, triggering the overcurrent protection function.
3.Temperature sensor failure: The temperature sensor of the inverter may malfunction, resulting in a false alarm overheating fault.
4.Improper parameter setting: Incorrect parameter settings of the inverter, such as too short acceleration time or mismatched motor parameter settings, may also cause the ramp to trip.
3. Repair steps.
1.Check the motor load: Check whether the working load of the motor is normal, whether there is a mechanical failure or blockage. If there is an abnormality, it is necessary to repair the mechanical fault or adjust the load to a suitable range.
2.Check the motor cable: check whether the motor cable is damaged or short-circuited, and replace it in time if damaged. At the same time, check whether there is a short circuit inside the motor, and clean and repair it if necessary.
3.Check the temperature sensor: check whether the internal temperature sensor of the inverter is normal, and replace it in time if there is a fault. At the same time, ensure that the inverter has good heat dissipation and no debris blocking the heat dissipation port.
4.Check the parameter settings: Check whether the parameter settings of the inverter are correct, especially the setting of the acceleration time and motor parameters. If there is a mismatch, it needs to be adjusted according to the actual situation.
5.Check the inverter motherboard: If no problem is found in the above steps, the inverter motherboard may be faulty. At this time, the inverter motherboard needs to be inspected and repaired, and the damaged motherboard should be replaced if necessary.
4. Precautions.
1.Before carrying out repairs, be sure to cut off the power supply to ensure that the inverter and motor stop working completely.
2.During the inspection and repair process, care should be taken to avoid damage to other components.
3.If you are not familiar with the internal circuit of the inverter, it is recommended to seek the help of professional maintenance personnel.
4.In daily use, the inverter should be regularly inspected and maintained to ensure its normal operation.
5. Precautionary measures.
1.Regularly check the motor load and mechanical condition to ensure that it is working properly.
2.Regularly check the condition of the motor cable and the inside of the motor to prevent cable breakage or short circuit inside the motor.
3.Regularly check the heat dissipation of the inverter and keep the heat dissipation port unobstructed.
4.Regularly check the parameter settings of the inverter to ensure that the parameters are set reasonably.
5.For the inverter that has not been used for a long time, it should be powered on before use to ensure that it works normally.