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Fuling Encyclopedia | Three Steps for Commissioning a Variable-Speed Drive

Author:FULING 2024.04.04
  1. The no-load test run of the inverter is carried out first

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 for no-load test of the inverter first. Before power on carefully read the inverter user manual, familiar with the relevant functions and Settings, operation methods, on this basis. There are two purposes for no-load test run! One is to familiarize yourself with the relevant operation methods through actual operation, such as positive, reverse, stop and other operations, and observe the action of the inverter and the temperature rise No Normal.

The second is to be familiar with the setting and operation methods of the relevant functions combined with the physical object

After setting, you can try the action state and action process of the basic function, as above

Rise, fall time setting, etc. On this basis, look at the outer terminal letter

Whether the control action is normal, such as rotating the potentiometer clockwise or changing the frequency

Rate Whether the output frequency of the inverter changes with the given current

The number changes simultaneously.

2. Then use the inverter with the motor no-load test run

After the no-load test run of the inverter is normal, it can be connected to the motor for no-load test run. Before connecting the motor, it is necessary to confirm that the technical indicators of the motor are qualified. Do not load the motor. Then let the inverter drive the motor to rotate and observe whether it is normal, such as whether the motor rotation direction meets the requirements. Turn the potentiometer with the given frequency counterclockwise to the left end of 0Hz, then switch on the forward turn switch of the inverter (FWD), slowly rotate the potentiometer clockwise, so that the given frequency gradually increases, observe the rotation of the motor, at 50% of the maximum frequency, let the motor rotate for a few minutes, and observe the value of voltage and current. Then let the output frequency of the inverter reach the maximum frequency, and then let the motor rotate for a few minutes. Then reduce the output frequency to 75%, 25% of the maximum frequency, let the motor turn for a while, and then adjust the output frequency, and then turn off the forward switch (FWD) to see whether the motor stops according to the set deceleration time. This process basically does not need to set parameters, it is feasible to use the parameter preset value of the inverter factory.

3. Finally, debug and run with load

Through the trial operation of the above two steps, it can be put into operation with load

Work, that is, to adjust the set parameters, so that the inverter can be pressed

Normal motor operation is required. Commissioning of the motor with load

During the process, we should pay attention to observe whether the motor and machinery have abnormal sound and vibration

Kinetic phenomena.

Its operation method is basically the same as the second step, because the parameter preset value of the inverter factory may be different from the load characteristics of the use of the site, it is necessary to adjust some parameters according to the actual site, that is, the setting and debugging of parameters. In debugging, it is important to observe whether the setting of torque, acceleration and deceleration time matches the load characteristics when the motor starts with load. The most intuitive is to see whether the motor has a trip alarm in the process of starting, accelerating and decelerating, 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, then

After connecting the forward turning switch (FWD) of the inverter, the motor should be set

The acceleration time rises the rotational speed to the maximum, if overloaded during acceleration

Overcurrent alarm or tripping, indicating that the acceleration time setting is short should be appropriately extended

Speed time. At 50% of the maximum frequency, let the motor run for a few minutes and

Observe the value of voltage and current. Then turn off the forward switch and the motor should

The speed should be reduced according to the set deceleration time and stop in the deceleration process

If overload, overvoltage alarm or tripping, it means that the deceleration time is set too short

Increase the deceleration time appropriately. And then spin the frequency set potentiometer, use it

To increase and decrease the given frequency, and observe whether the motor can smoothly increase speed and sum

Slow down without alarm or tripping. Frequency conversion using a current signal as a given frequency

The debugging method is the same as above, but the potentiometer is changed to adjust the current size

Well, just that.

During commissioning, the frequency converter alarms,

Tripping is a very common thing for the beginning

Scholars should not panic. Alarm and tripping indicate the protective action of the inverter

The function is normal because the relevant parameters are not adjusted to the ideal state during debugging

State, that is, has not yet met the requirements of the load characteristics, then you can pass

The fault display information of the inverter is combined with the user manual to decide the next step

The debugging idea until the satisfactory debugging effect is achieved.

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