The frequency converter is a power control device that converts the power frequency power supply into another frequency by utilizing the on-off function of the power semiconductor device, and can realize soft start, frequency conversion speed regulation, improve operation precision, change power factor, overcurrent/acceleration of the AC asynchronous motor. Overvoltage / overload protection and other functions.
Mainly used in the application of fans and pumps. In order to ensure the reliability of production, all kinds of production machinery have a certain margin when designing with power drive. When the motor can't run under full load, in addition to meeting the power drive requirements, the excess torque increases the consumption of active power, resulting in wasted power. Fans, pumps and other equipment traditional speed control method is to adjust the air volume and water supply by adjusting the baffle and valve opening of the inlet or outlet. The input power is large, and a large amount of energy is consumed in the interception process of the baffle and the valve. in. When using variable frequency speed regulation, if the flow demand is reduced, the speed can be met by reducing the speed of the pump or fan. The basic method of general inverter debugging is discussed below.
Basic methods and steps for commissioning the inverter:
First, the inverter's no-load current test
1. Ground the ground terminal of the inverter.
2. Connect the power input terminal of the inverter to the power supply through the leakage protection switch.
3. Check whether the factory display of the inverter display window is normal. If it is not correct, it should be reset. Otherwise, it is required to be returned.
4. Familiar with the operation keys of the inverter. The general inverter has six keys: RUN, STOP, PROG, DATAPENTER, UP (UP), DOWN, DOWN, and other inverters. The definition of the keys is basically the same. In addition, some inverters also have function keys such as MONITORPDISPLAY, RESET, JOG, and SHIFT.
Second, the inverter with motor running at no load
1. Set the power and number of poles of the motor, and consider the working current of the inverter.
2. Set the maximum output frequency, fundamental frequency and set torque characteristics of the inverter. The general-purpose inverters are equipped with multiple VPf curves for the user to select. The user should select the appropriate VPf curve according to the nature of the load. In the case of fan and pump loads, set the torque running code of the frequency converter to variable torque and torque reduction operating characteristics. In order to improve the low-speed performance of the inverter when starting, the torque output from the motor can meet the requirements of the production load start-up, and the starting torque should be adjusted. In the asynchronous motor variable frequency speed control system, the torque control is more complicated. In the low frequency band, since the influence of resistance and leakage reactance cannot be ignored, if the VPf is kept constant, the magnetic flux will decrease, thereby reducing the output torque of the motor. For this reason, the voltage is appropriately compensated at the low frequency band to increase the torque. Generally, the inverter is manually compensated by the user.
3. Set the inverter to its own keyboard operation mode, press the run key and stop key to observe whether the motor can start and stop normally.
4. Familiar with the protection code when the inverter runs faulty, observe the factory value of the thermal protection relay, observe the set value of the overload protection, and modify it if necessary. The user of the inverter can set the electronic thermal relay function of the inverter according to the instruction manual of the inverter. When the output current of the inverter exceeds its allowable current, the overcurrent protection of the inverter will cut off the output of the inverter. Therefore, the maximum threshold of the inverter electronic thermal relay does not exceed the maximum allowable output current of the inverter.
Third, with load test run
1. Manually operate the running stop button of the inverter panel, observe the motor running stop process and the display window of the inverter to see if there is any abnormality.
2. If the inverter has an overcurrent protection action during the start of P stop motor, the acceleration P deceleration time should be reset. The acceleration of the motor during acceleration and deceleration depends on the acceleration torque, and the frequency change rate of the inverter during start and brake is set by the user. If the motor's moment of inertia or motor load changes, when the speed is increased or decelerated according to the preset frequency change rate, there may be insufficient acceleration torque, which may cause the motor to stall, that is, the motor speed is not in harmony with the inverter output frequency, resulting in Current or over voltage. Therefore, it is necessary to set the acceleration and deceleration time according to the motor inertia and load, so that the frequency change rate of the inverter can be coordinated with the motor speed change rate.
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