How to adjust the parameters when the inverter is overloaded

The inverter is one of the important devices in industrial control systems. Its main function is to convert AC power into adjustable AC power output to control the motor speed and load. When using the inverter, you may encounter overload problems, which are mainly manifested as the inverter output current exceeding the rated current, resulting in equipment failure or shutdown. This article will introduce how to solve the inverter overload problem by adjusting parameters.

1. Determine the cause of overload

Before adjusting the parameters, we need to first determine the cause of the overload so that we can take targeted measures. Generally, there are several reasons for inverter overload:

(1) Excessive load: When the load exceeds the load specified by the motor designer, the motor will send an overload signal. At this time, the inverter will limit the output current to protect the motor from damage. (2)

Poor working conditions: For example, the machine operating environment temperature is too high, the machine acceleration is too fast, etc.

(3) Controller parameter error: Incorrect setting of the inverter controller parameter may cause overload.

(4) Fault of the inverter itself: If there is a fault in the inverter itself, it will also cause overload.

After determining the cause of the inverter overload, we can take appropriate measures according to the specific situation.

2. Adjustment of controller parameters

If the overload is caused by the wrong setting of the controller parameters, we need to adjust the parameters. The specific methods are as follows:

(1) Set the current limit value

In the inverter controller parameters, there is generally a current limit value item, which is the upper limit value of the motor output current. Setting this value can avoid overload caused by overload operation of the motor. In general, the current limit value should be set to 1.1-1.5 times the rated current. If the output current still exceeds the set value after setting the current limit value, you can continue to adjust the value appropriately.

(2) Adjust the acceleration and deceleration time

During the operation of the inverter, it is often necessary to control the acceleration and deceleration time of the motor according to the working requirements. If the acceleration and deceleration time is set too fast, the motor load may be too heavy, resulting in overload. Therefore, appropriately extending the acceleration and deceleration time to ensure that the motor load is not too heavy is an effective way to reduce overload.

(3) Adjust the operation mode

There are two operation modes of the inverter, namely fixed speed mode and vector control mode. The constant speed mode is suitable for occasions with stable load operation, while the vector control mode is suitable for occasions with sudden large loads. Selecting different operation modes according to actual needs can better protect the equipment and avoid overload.

3. Check the motor and machine equipment

If the above methods cannot solve the overload problem, we need to further check the motor and machine operation status. The specific methods are as follows:

(1) Check the motor load

If the motor load is too large, it will cause problems such as motor self-heating and current overload. Therefore, we need to check whether the motor load is reasonable. If the load is too large, we need to reduce the load in time to avoid overload.

(2) Check the machine equipment status

The status of the machine equipment will also affect the running status of the motor, resulting in overload. Therefore, we need to check the running status, acceleration, temperature and other indicators of the machine equipment. If any abnormal situation is found, it needs to be solved in time.

(3) Check the line connection

Problems such as poor line connection and poor contact may also cause problems such as excessive current and overload. Therefore, we need to check whether the line connection is correct and whether the cable is damaged, and solve these problems in time.

In short, the overload problem of the inverter is a common problem, but it is not inevitable. By correctly setting controller parameters, checking the status of motors and machine equipment, etc., we can effectively solve the overload problem and ensure the normal operation of the equipment. In the process of using the inverter, the inverter should be correctly configured and adjusted according to specific needs to achieve the best working state.