1. First, conduct a no-load test run of the frequency converter.
First, conduct a no-load test run of the frequency converter. Check that all wiring of the frequency converter is correct. Do not connect the motor to the output of the frequency converter yet; perform a no-load test on the frequency converter. Before powering on, carefully read the frequency converter user manual to familiarize yourself with the relevant functions, settings, and operating methods. The purpose of the no-load test run is twofold: first, to familiarize yourself with the keyboard and related operating methods through actual operation, such as performing forward, reverse, and stop operations, and to observe whether the frequency converter's operation and temperature rise are normal; second, to familiarize yourself with the settings and operating methods of relevant functions using a physical example. After setting, try the operation status and process of basic functions, such as setting the rise and fall times. Then, check whether the signals and control actions of the external terminals are normal, such as whether the change in the frequency converter's output frequency changes simultaneously with the given signal when the potentiometer is rotated clockwise or the frequency and current are changed.
2. Then, use the frequency converter to drive the motor under no-load test run.
After the frequency converter has successfully completed its no-load test run, the motor can be connected for a no-load test run. Before connecting the motor, ensure that all technical specifications of the motor are within acceptable limits. Do not run the motor under load. Then, let the frequency converter drive the motor to rotate and observe whether it is normal, such as whether the motor's rotation direction is as required. Turn the frequency setting potentiometer counterclockwise to the left end at 0Hz, then turn on the frequency converter's forward rotation switch (FWD). Slowly rotate the potentiometer clockwise to gradually increase the set frequency, observing the motor's rotation. At 50% of the maximum frequency, let the motor rotate for a few minutes and observe the voltage and current values. Then, let the frequency converter's output frequency reach the maximum frequency and let the motor rotate for a few minutes. Next, lower the output frequency to 75% and 25% of the maximum frequency, let the motor rotate for a while, then increase the output frequency again. Then, disconnect the forward rotation switch (FWD) and see if the motor stops according to the set deceleration time. This process generally does not require parameter setting; the preset parameter values from the frequency converter's factory settings are sufficient.
3. Finally, perform load testing and debugging.
After completing the above two trial runs, the load-bearing operation can begin. This involves adjusting the set parameters to ensure the frequency converter can drive the motor normally as required. During the load-bearing commissioning of the motor, it is important to observe the motor and machinery for any abnormal noises or vibrations.
The operation method is basically the same as the second step. Since the factory-set parameters of the frequency converter may differ from the load characteristics at the application site, certain parameters need to be adjusted according to the actual situation on site; that is, parameter setting and debugging. 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 under load. The most direct way to check is to see if any tripping alarms occur during motor startup, acceleration, and deceleration; otherwise, the relevant parameters should be adjusted according to the actual situation.
Specifically, turn the frequency setting potentiometer clockwise to the right (50Hz), then turn on the inverter's forward switch (FWD). The motor should accelerate to its maximum speed according to the set acceleration time. If overload, overcurrent alarms, or tripping occur during acceleration, it indicates that the acceleration time is set too short and should be appropriately increased. At 50% of the maximum frequency, let the motor run for a few minutes and observe the voltage and current values. Then turn off the forward switch. The motor should decelerate to its maximum speed and stop according to the set deceleration time. If overload, overvoltage alarms, or tripping occur during deceleration, it indicates that the deceleration time is set too short and should be appropriately increased. Then, rotate the frequency setting potentiometer to increase or decrease the set frequency and observe whether the motor can smoothly accelerate and decelerate without alarms or tripping. The debugging method for inverters using current signals as frequency setting is the same, except that the potentiometer is used to adjust the current.
During commissioning, inverter alarms and trips are common occurrences, and beginners should not panic. Alarms and trips indicate that the inverter's protection functions are normal; the problem stems from inadequate parameter adjustments during commissioning, meaning the load characteristics have not yet been met. In this case, you can use the inverter's fault display information, along with the user manual, to determine the next steps in the commissioning process until satisfactory results are achieved.
