Inverter, the screen shows a short circuit in the ground, what is the reason why the inverter report

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First, the voltage factor:

1) When the power supply voltage of the IGBT module is too high, it will exceed its safe working range, resulting in its breakdown damage;

2) When the power supply voltage is too low, the load capacity is insufficient, the running current increases, and the running motor is easy to produce stalled rotor phenomenon, which endangers the safety of the IGBT module;

3) The fluctuation of power supply voltage, such as the loss of DC loop filter (energy storage) capacitor, will cause the generation of inrush current and peak voltage, which will threaten the safe operation of IGBT module;

4) The control voltage of the IGBT - when the driving voltage is low, it will lead to the under-excitation of the IGBT, the internal resistance of the IGBT will become larger, the power consumption and temperature will rise, and the IGBT module will be easily damaged.

Second, the current factor:

1) Overcurrent, in the light and medium overcurrent state, is the anti-time protection area;

2) Severe overcurrent or short circuit state, no delay quick break protection;

3. Temperature factor:

1) Mild temperature rise, forced air cooling and other means;

2) When the temperature rises to a certain amplitude, stop protection.

How the inverter works:

The inverter relies on the interruption of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. With the continuous improvement of industrial automation, frequency converters have also been widely used.

Before the appearance of the inverter, the application of adjusting the speed of the motor needs to be completed by the DC motor, otherwise it is necessary to use the built-in coupling machine VS motor, and the actual speed of the motor is reduced by the coupling machine in operation, and the inverter simplifies the above work, reduces the volume of the equipment, and greatly reduces the maintenance rate. However, there are high-frequency switching signals on the power line and motor line of the inverter, which will cause electromagnetic interference, and the power factor on the input side of the inverter is generally poor, which will produce harmonics at the power supply end.

2.When the cable output by the inverter to the motor is too long, the distribution parameters such as the distribution capacitance of the cable are large, resulting in a false alarm of the grounding fault.

3.When the distance between the inverter and the motor is long and the cable length exceeds the standard, the following solutions can be taken:

4.The inverter adds an output reactor, or uses an unshielded cable (this is generally not recommended), etc.

Ask a question, send the power, and the grounding protection will appear.

Ask a question with a 2500 megaohm meter with 50 megaohms to the ground.

The negative end wire was removed, and the electrical display grounding protection of the inverter was sent separately, and the inverter may be partially damaged by the IGBT grounding. The cable may be grounded because of broken insulation or immersion in water. The motor may be grounded with stator insulation damage.

It could also be that the cable is too long causing a ground fault.

Question: The motor line has been withdrawn.

Ground faults are generally caused by faulty drives, cables, or motors.

The inverter may be IGBT partially damaged grounding.

The cable may be grounded because of broken insulation or immersion in water.

The motor may be grounded with stator insulation damage.

It could also be that the cable is too long causing a ground fault.

Pro, the 380v inverter shows a short circuit to the ground first put the load down from the inverter, check the grounding wire, and remove. No-load operation, if there is an alarm to prove that the inverter is broken, if it is normal, it means that there is a problem with the load. Even the load line can be suspected.

Use a 500 volt shake meter to see the ground insulation of the load line and the motor, if the insulation is fine, if the insulation is fine, it can be conditionally connected to other inverters to try it, and then find a small motor to connect to the inverter to try it, step by step If the inverter is not good, you don't repair it yourself! When the inverter is working normally, the three-phase electric balance source and the ground should not be conductive, but if there is a grounding fault, there will be leakage between the three-phase power supply and the ground, and the leakage current inverter will detect it, and when it exceeds a certain current value, the inverter will report the grounding fault. There are many reasons for grounding faults to be eliminated

1: Damage to IGBT. 2：

Whether the insulation value of the motor is sufficient. 3: Is the cable in the inverter plugged in?

4: The possibility of bad current detection is also relatively large and other components. As far as you say about the three-pin socket, it does have a dedicated ground wire.

This ground wire is mainly designed for home users. Its function is to flow the static electricity on household appliances into the earth through it, and its safety effect: first: the family will not be electrocuted due to the aging of electrical appliances or other problems caused by static electricity; Second:

There are some household appliances that have delicate components in them that will not be damaged due to static electricity.

Ground faults are generally caused by faulty inverters, cables, teasing or motors. The inverter Shan Yuchang may be IGBT partially damaged grounding. The cable may be grounded due to broken insulation or immersion in water.

The motor may be grounded with stator insulation damage. It could also be that the cable is too long causing a ground fault.

Ground faults are generally caused by faulty drives, cables, or motors.

After detecting the abnormality, the PWM control signal of the power semiconductor device is blocked, so that the motor automatically stops. Such as overcurrent cut-off, regenerative overvoltage cut-off, semiconductor cooling fan overheating and instantaneous power failure protection.

The inverter is used to change the frequency and amplitude of the AC motor power supply, so as to change the period of its moving magnetic field, so as to achieve the purpose of smoothly controlling the speed of the motor.

The emergence of the inverter has simplified the complex speed control and replaced most of the work that could only be done with the DC motor with the combination of the inverter and the AC squirrel cage induction motor, which reduced the volume and reduced the maintenance rate, and made the transmission technology develop to a new stage.

The inverter reports a ground fault due to the following factors:

First, the voltage factor:

1) When the power supply voltage of the IGBT module is too high, it will exceed its safe working range, resulting in its breakdown damage;

2) When the power supply voltage is too low, the load capacity is insufficient, the running current increases, and the running motor is easy to produce stalled rotor phenomenon, which endangers the safety of the IGBT module;

3) The fluctuation of power supply voltage, such as the loss of DC loop filter (energy storage) capacitor, will cause the generation of inrush current and peak voltage, which will threaten the safe operation of IGBT module;

4) The control voltage of the IGBT - when the driving voltage is low, it will lead to the under-excitation of the IGBT, the internal resistance of the IGBT will become larger, the power consumption and temperature will rise, and the IGBT module will be easily damaged.

Second, the current factor:

1) Overcurrent, in the light and medium overcurrent state, is the anti-time protection area;

2) Severe overcurrent or short circuit state, no delay quick break protection;

3. Temperature factor:

1) Mild temperature rise, forced air cooling and other means;

2) When the temperature rises to a certain amplitude, stop protection.

Fourth, other factors:

1) The abnormality of the driving circuit, such as the interruption of the negative cut-off negative voltage control loop, will cause the IGBT to be damaged by false touch;

2) The control circuit and the detection circuit itself are abnormal, such as the reference voltage drift of the detection circuit, which leads to the change of the control point of the protection action, and cannot play the due protection role.

Ground faults are generally caused by faulty drives, cables, or motors.

The inverter may be IGBT partially damaged grounding.

The cable may be grounded because of broken insulation or immersion in water.

The motor may be grounded with stator insulation damage.

It could also be that the cable is too long causing a ground fault.