Debugging steps for putting the inverter into operation

It is usually completed in three steps: inverter no-load trial operation, inverter no-load operation with motor and inverter load debugging operation. These three steps are introduced in detail below.

1. Perform no-load test run of the inverter first.

First, conduct a no-load test run of the inverter. First, check whether all the wiring of the inverter is correct. Do not connect the motor to the output end of the inverter. Perform a no-load test on the inverter. Before powering on, carefully read the inverter user manual, familiarize yourself with the relevant functions and settings, and operation methods, and then power on. There are two purposes for no-load test run: one is to familiarize yourself with the keyboard and related operation methods through actual operation, such as forward, reverse, stop and other operations, and observe whether the action and temperature rise of the inverter are normal. The second is to familiarize yourself with the setting and operation methods of related functions in combination with the real object. After setting, you can try the action state and action process of the basic functions, such as the setting of the rise and fall time. On this basis, check whether the signal and control action of the external terminal are normal, such as when the potentiometer is rotated clockwise or the frequency given current is changed, whether the change of the output frequency of the inverter changes at the same time as the given signal.

2. Then use the inverter to drive the motor for a no-load test run

After the inverter runs normally in no-load test, you can connect the motor for no-load test. Before connecting the motor, make sure that the various technical indicators of the motor are qualified. The motor should not be loaded. Then let the inverter drive the motor to rotate and observe whether it is normal, such as whether the rotation direction of the motor meets the requirements. Turn the frequency setting potentiometer counterclockwise to 0Hz on the left end, then turn on the inverter's forward switch (FWD), slowly turn the potentiometer clockwise to gradually increase the given frequency, observe the rotation of the motor, and at 50% of the maximum frequency, let the motor rotate for a few minutes, and observe the voltage and current values, then let the inverter output frequency reach the maximum frequency, and then let the motor rotate for a few minutes. Then reduce the output frequency to 75% and 25% of the maximum frequency, let the motor rotate for a while, then increase the output frequency, and then disconnect the forward switch (FWD) to see if the motor stops according to the set deceleration time. This process basically does not require parameter setting, and the parameter preset values ​​of the inverter when it leaves the factory are feasible.

3. Finally, perform debugging operation with load

After the above two steps of trial operation, you can start the operation with load, that is, adjust the set parameters so that the inverter can drive the motor to run normally as required. During the commissioning and operation of the motor with load, pay attention to observe whether the motor and machinery have abnormal sounds or vibrations.

The operation method is basically the same as the second step. Since the preset parameter values ​​of the inverter at the factory may be different from the load characteristics of the site, it is necessary to adjust some parameters based on the actual situation on site, that is, to set and debug the parameters. During debugging, the focus should be on observing whether the torque setting, acceleration and deceleration time settings match the load characteristics when the motor starts with load. The most intuitive thing is to see whether there is a trip alarm during the start, acceleration and deceleration of the motor. Otherwise, the relevant parameters should be adjusted according to the actual situation.

Specifically, turn the frequency setting potentiometer clockwise to the right end of 50Hz, and then turn on the forward switch (FWD) of the inverter. The motor should increase the speed to the maximum according to the set acceleration time. If there is an overload, overcurrent alarm or trip during the acceleration process, it means that the acceleration time is set too short and the acceleration time should be appropriately extended. At 50% of the maximum frequency, let the motor rotate for a few minutes and observe the voltage and current values. Then turn off the forward switch, the motor should reduce the speed and stop according to the set deceleration time. If there is an overload, overvoltage alarm or trip during the deceleration process, it means that the deceleration time is set too short and the deceleration time should be appropriately extended. Then rotate the frequency setting potentiometer to increase or decrease the given frequency, and observe whether the motor can increase and decelerate smoothly without alarm or tripping. The debugging method of the inverter using current signal as the frequency setting is the same as above, except that the potentiometer is changed to adjust the current size.

During debugging, it is very common for the inverter to alarm or trip. Beginners should not panic. Alarms and trips indicate that the inverter's protection function is normal. This is because the relevant parameters were not adjusted to the ideal state during debugging, that is, the load characteristics have not been met. At this time, the inverter's fault display information can be combined with the user manual to determine the next debugging idea until a satisfactory debugging effect is achieved.