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  • Why is the voltage of the inverter changes in proportional to the frequency?
    When the magnetic circuit of motor changes with the running frequency fX during speed regulation, it is very easy to make the magnetic circuit of the motor serious saturation, which will lead to serious distortion of waveform of exciting current to produce a high peak current. Therefore, the frequency and voltage must be changed in proportion to change the frequency and control the output voltage of the inverter, so that the magnetic flux of the motor must be kept to avoid the occurrence of weak magnetic and magnetic saturation. 
  • What are the functions and purposes of the inverter?
    Rectifying circuit, starting protection, filter circuit, inverter circuit.
  • What is the composition of the main circuit of the inverter product?
  • what are the control modes of the inverter?
    V/F sine pulse width modulation mode, open loop vector control mode, closed-loop vector control mode and direct torque control mode converter.
  • How much energy does the inverter consume?
    Power consumption of the inverter is 3-4%. 
  • what is an inverter?
     Inverter is a power control device that transforms the power supply into another frequency by using the power of the power semiconductor device.
  • Electrolytic capacitors need to be replaced after 30,000~40,000 hours
  • What is the service life of electrolytic capacitor?
    Electrolytic capacitors need to be replaced after 30,000~40,000 hours
  • Inverter displays five 8?
    The possible cause of failure: 1. keyboard failure or keyboard connection line is not good; 2. main control board failure; 3. drive plate wiring is not connected properly; 4. drive power problems
  • How to handle motor stall?
    Check whether the motor, wire and inverters are damaged or not, whether the line is connected properly, whether the parameter setting is appropriate, such as upper limit frequency, lower limit frequency, basic frequency, maximum frequency setting, whether or not they are contradictory. With external control timing, is there a preset option and other improper settings.
  • How to deal with the machine overheating?
    When faced with this situation, first check whether the cooling fan runs properly with the hand, when the fan is running normally, determine whether the environment temperature is too high, inverter ventilation is poor, or whether the temperature detection circuit is faulty.
  • The reason for phase loss fault

    The inverter has single phase 220V and three-phase 380V, and the input phase loss is only in the three-phase product. The diagram shows the main circuit of the inverter, R, S, and T are the three-phase AC input, and when one of the phases is disconnected due to the failure of the fuse or breaker, the phase loss fault occurs.

  • How to handle the overload?

    1) Check whether the motor is overheat

    If the temperature rise of the motor is not high, the electronic thermal protection function of the inverter should be checked first. If the inverter still has surplus capacity, increase the preset value of the electronic thermal protection function. If the temperature rise of the motor is too high, and the overload appears to be normal overload, the overload of the motor is explained. At this point, the transmission ratio should be properly increased to reduce the load on the motor shaft, increase the transmission ratio if possible. If the transmission ratio cannot be increased, the capacity of the motor should be increased.

    2) Check the three phase voltage balance on motor side

    If the three-phase voltage on the motor side is unbalanced, the three-phase voltage of the output end of the inverter should be checked again. If it is not balanced, the problem is in the inverter. If the inverter output voltage is balanced, the problem lies in the line between the inverter to motor, we should check all the terminal screws are tightened, if there are other electrical contactor or appliances between the inverter and the motor, check whether the connection terminals have been tightened, and the contact condition of contact is good.

  • What are the main reasons for the overload?

    In the operation of the motor, the running current exceeds the rated value, but less than the over-current limit value, the operation time is longer, such phenomenon is called overload. The basic characteristics are: Although the current overload exceeds the rated value, but the exceeding range is small, generally do not form a large surge current (otherwise it becomes overcurrent fault), another prominent feature is the overload is accumulated, and the overload fault will be reported only the accumulation time is reached.

    1) Mechanical overload

    The main features is that the motor is heated up which can be sensed by hand touching; or read the running current  from the inverter screen, and compare it with the rated current to judge the overload situation.

    2) Unbalanced three-phase voltage

    Overload trip occur due to running current of a certain phase is too large, its features is that motor heating is uneven which cannot be found by reading the running current (as many inverter display displays one phase current only); the effective method is to use the voltage meter to measure the three-phase output voltage of the inverter, thus determining whether there is phase loss or imbalance voltage.

    The current detection part of the inverter breaks down, and the detection of the current signal is too large, leading to overload trip

    3) Mal-operation

    The current detection part of the inverter has a fault, and the detected current signal is too large, resulting in overload trip

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