In the stable matching problem, how to adjust the algorithm to output multiple sets of optimal solut

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If a motor is driven by an inverter, a ground fault will be reported for a period of time, but there will be no problem when starting the motor with a frequency of use.

There are several reasons for this:

1. When the power frequency is running, there is no higher harmonic, the current of the distributed capacitance to the ground is weak, and there is no leakage;

2. The insulation of the motor is not good, and the capacitance distributed to the ground is large;

3. When the PWM rectangular wave output by the inverter simulates sinusoidal alternating current, there are higher harmonics, and the current of the distributed capacitance to the ground is strong, and it is felt that there is serious leakage;

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.

There are two possibilities for the inverter to report an error.

1. False alarm, inverter itself failure.

2. There is indeed some place to ground.

I don't know how your 'measured motor and its wiring are not abnormal' is detected, if you do use the shake meter to shake the motor and cable, there is no grounding phenomenon. Then it can only be a false alarm, after the reset to see if it can operate normally, if it is still grounded, then the inverter detects the fault and sends it for repair.

If the inverter reports a ground fault, the insulation of the inverter's output cable should be checked first, and then the insulation of the motor. If you block this function through the parameter settings, it will affect the start of the inverter.

The ground fault of the inverter is generally due to the igbt burning, or there is a problem with the trigger circuit, which causes the three-phase unbalance alarm, you check the IGBT module.

There are many causes of ground faults. You're going to rule out the damage of 1:IGBT.

2: The insulation value of the motor is enough. 3：

Is the cable in the inverter plugged in, 4: the possibility of bad current detection is also relatively large, and other components, you can rule it out.

Generally there is an impact, check the motor insulation, and then check the test circuit.

Save yourself from more trouble.

I don't know how much power the motor is? Is it compatible with the inverter?

If the motor is matched with the inverter, it means that the motor is wired incorrectly, and the triangle connection is connected into a star.

When the load becomes larger and the stall rotor is enlarged, the current does not exceed the allowable value of the inverter, which is the phenomenon.

Or the motor power is too small.

Not to mention LG, it is a domestic miscellaneous brand, the function of the inverter is also very perfect, if the motor and the inverter match, the motor wiring is correct, there will be no such low-level error.

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