The overcurrent tripping of the inverter is divided into short-circuit faults, tripping and rising during operation, tripping during speed reduction, etc.
1. Short-circuit fault
(1) Fault characteristics
a) *** tripping may occur during operation, but if it is restarted after resetting, it often trips as soon as the speed rises.
b) has a large inrush current, but most drives have been able to trip for protection without damage. Since the protection trips so quickly, it is difficult to observe the magnitude of the current.
(2) Judgment and processing
step, the first choice is to judge whether there is a short circuit. In order to make it easier to judge, a voltmeter can be connected to the input side before starting again after reset, and when restarting, the potentiometer rotates slowly from zero, and at the same time, pay attention to the voltmeter. If the output frequency of the inverter trips immediately as soon as it rises, and the pointer of the voltmeter shows signs of instantaneous return to "0", it means that the output of the inverter has been short-circuited or grounded.
The second step is to determine whether it is a short circuit inside the inverter or an external short circuit. At this time, the wiring at the output end of the inverter should be disconnected, and then the potentiometer should be rotated to make the frequency rise, if it is still tripped, it means that the inverter is short-circuited; If it is no longer tripped, it means that there is a short circuit outside the inverter, and the line from the inverter to the motor should be checked, as well as the motor itself.
2. The light overcurrent load is very light, but the overcurrent trips.
This is a phenomenon unique to frequency conversion speed regulation. In the V/F control mode, there is a very prominent problem: that is, the instability of the motor magnetic circuit system during operation. The basic reasons for this are:
In low-frequency operation, torque compensation (i.e., increasing the U/f ratio, also known as torque lifting) is often necessary in order to drive heavier loads. As a result, the saturation of the magnetic circuit of the motor varies with the weight of the load. This kind of overcurrent tripping caused by the saturation of the magnetic circuit of the motor mainly occurs in the case of low frequency and light load. Solution: Adjust the U/f ratio repeatedly.
3. Heavy load overcurrent
(1) Fault phenomenon
Some production machinery in the process of operation load suddenly increased, or even "stuck", the speed of the motor due to the belt does not move and dropped sharply, the current increased sharply, overload protection is too late to act, resulting in overcurrent tripping.
(2) Solution
a) First understand whether the machinery itself is faulty, and if there is a fault, then repair the machine.
b) If this overload is a phenomenon that often occurs in the production process, the first consideration is whether the transmission ratio between the motor and the load can be increased? Appropriately increasing the transmission ratio can reduce the resistance torque on the motor shaft and avoid the situation that the belt cannot move. If the transmission ratio cannot be increased, the only way to consider increasing the capacity of the motor and inverter is to consider.
4. Overcurrent in speed up or down
This is caused by a rapid ramp-up or slow-down, and the following measures can be taken:
(1) Extend the speed rise (decrease) time
First, find out if the ramp-up or de-spin time is allowed according to the requirements of the production process, and if so, the ramp-up (de-escalation) time.
(2) Accurately preset the function of self-processing (anti-stall) of rising (decreasing) speed
The inverter is equipped with a self-processing (anti-stall) function for the overcurrent in the process of rising and decreasing speed. When the up-and-down current exceeds the preset upper limit current, the up-and-down rate will be paused, and the ramp-up (down) rate will continue when the current drops below the set value.
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