In the long-term operation of the inverter, various faults may occur due to aging of components, improper operation, etc., for example, the power-on of the inverter cannot be displayed, and the over-voltage is displayed on the power-on. Below we mainly talk about the fault check and judgment of the inverter and the handling of common faults of the inverter.
1. The rectifier module of the inverter is faulty.
The damage of the rectifier module is a common fault of the inverter. Normally, it can be determined whether the rectifier module has been damaged by blocking the forward and reverse with a multimeter. The faults of the rectifier module of the inverter are mostly caused by the grid voltage or internal short circuit. When the fault is handled on site, the grid problem should be eliminated first and then the rectifier bridge should be replaced. (Source: )
2. Inverter module failure of the inverter
There is a close relationship between the inverter module and the drive components of the frequency converter. Damage to the inverter module is usually accompanied by damage to the drive components and vice versa. Failure of the motor, cable and drive circuit will cause damage to the inverter inverter module. After repairing the drive circuit, after the drive waveform is measured, replace the drive inverter module to restore the inverter to normal operation.
After the inverter repairs and replaces the inverter module on site, it is necessary to check other parts of the drive system to determine that the drive component has no fault before running the inverter. Otherwise, it will cause secondary failure of the inverter and increase economic loss. Check the driver circuit can use the method of comparing the resistance of each trigger terminal when the power is not connected.
3, the inverter shows over current
There are many reasons for the inverter to show over current. If the machine is stuck or sudden load increases, the inverter's acceleration and deceleration time settings will be unreasonable. It will also cause over-current of the inverter, as well as damage to the inverter module and the drive module. It is necessary to repair or replace the module on site.
4. The inverter cannot be powered on.
After the inverter is powered on, it cannot be displayed. Most of it is caused by the damage of the power switch and the soft charging circuit. In these cases, the DC circuit of the inverter has no DC power and cannot work normally. Of course, the inverter cannot be displayed after it is powered on. It may be that the display panel itself has failed and a new panel needs to be replaced.
5. The inverter is powered on to display overvoltage or undervoltage.
When the inverter displays overvoltage or undervoltage after power-on, it should check whether the circuit and the circuit board can work normally. Generally, in the case of damage to the circuit system, if the inverter inputs a phase loss after power-on, it will display overvoltage or undervoltage. . Find the voltage detection circuit and detection points, and replace the damaged parts to solve
Incremental Encoder is commonly used, and Absolute Encoder is used if there are strict requirements on position and zero position. Servo system should be analyzed in detail, depending on the application situation. Commonly used incremental encoder for speed measurement, which can be used for infinite accumulation measurement; Absolute encoder is used for position measurement, and the position is unique (single or multiple turns). Finally, it depends on the application situation and the purpose and requirements to be realized.
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