It is usually completed in accordance with the three steps of no-load trial operation of the inverter, no-load operation of the inverter with motor and commissioning operation with load, and the following three steps are introduced in detail.
1**No-load test operation of line inverter
First of all, check whether all the wiring of the inverter is correct, and do not connect the output end of the inverter to the motor, and conduct a no-load test on the inverter. Read the user manual of the inverter carefully before powering on, be familiar with the relevant functions, settings, and operation methods, and power on this basis. The purpose of no-load test operation is twofold: 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 be familiar with the setting and operation method of related functions in combination with the real thing, and try to see the action state and action process of the basic functions after setting, such as the setting of rise and fall time. On this basis, it is necessary to see whether the signal and control action of the external terminal are normal, such as whether the output frequency of the inverter changes at the same time as the given signal when the potentiometer is rotated clockwise or the frequency is changed to a given current.
2. Then use the inverter with the motor for no-load test run
After the no-load test operation of the inverter is normal, it can be connected to the motor for no-load test operation. Before connecting the motor, be sure to confirm that the 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 direction of rotation of the motor meets the requirements. Turn the frequency given potentiometer counterclockwise to the left end of 0Hz, then turn on the forward switch (FWD) of the inverter, slowly rotate the potentiometer clockwise, so that the given frequency gradually increases, observe the rotation of the motor, at 50% of the largest frequency, let the motor rotate for a few minutes, and observe the value of voltage and current, and then let the output frequency of the inverter reach the largest frequency, and then let the motor rotate for a few minutes. Then lower the output frequency to 75% and 25% of the largest 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 need to set parameters, and it is feasible to use the preset values of the parameters when the inverter leaves the factory.
After 3***, the commissioning operation with load will be carried out
Through the trial operation of the above two steps, the operation with load can be carried out, that is, the set parameters are adjusted, so that the inverter can drive the motor normally as required. In the process of commissioning and operation of the motor with load, it is necessary to pay attention to observe whether the motor and machinery have abnormal noise and vibration.
The operation method is basically the same as the second step, because the preset value of the parameters of the inverter at the factory may be different from the load characteristics of the use site, it is necessary to adjust some parameters in combination with the actual situation of the site, that is, to set and debug the parameters. In the debugging, the focus should be on observing whether the setting of torque, acceleration and deceleration time matching the load characteristics when the motor is started with load. The intuitive thing is to see whether there is a trip alarm in the process of starting, accelerating and decelerating the motor, otherwise the relevant parameters should be adjusted according to the actual situation.
Specifically, the frequency given potentiometer is rotated clockwise to the right end of 50Hz, and then the forward switch (FWD) of the frequency converter is turned on, then the motor should rise to the maximum speed according to the set acceleration time, if the overload, overcurrent alarm or trip during the acceleration process, it means that the acceleration time is set to be short, and the acceleration time should be appropriately extended. At 50% of the highest frequency, let the motor rotate for a few minutes, and observe the value of voltage and current. Then turn off the forward switch, the motor should reduce the speed and stop according to the set deceleration time, if the deceleration process is overloaded, overvoltage alarm or tripping, indicating that the deceleration time is set too short and the deceleration time should be appropriately lengthened. Then rotate the potentiometer with a given frequency, use it to increase and decrease the given frequency, and observe whether the motor can rise and decelerate smoothly without alarm or trip. For the frequency converter with a given frequency of the current signal, the debugging method is the same as above, but the potentiometer is changed to the current regulation.
In debugging, it is very common for the inverter to alarm and trip, so don't panic for beginners. Alarm and trip indicate that the protection function of the inverter is normal, which is due to the fact that the relevant parameters are not adjusted to the ideal state during debugging, that is to say, the requirements of the load characteristics have not been met.
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