How do I select a drive? Which brand is better
?Ampang letter company can provide different types of inverter, the user can according to their actual process requirements and the use of occasions to choose different types of frequency converter. When selecting the inverter, note the following precautions:
????1, according to the load characteristics of the inverter, such as the load for the constant torque load; fan, pump load should be selected AM300 inverter.
????2, select the inverter should be the actual motor current value as the basis for selection of the inverter, the motor rated power can only be used as a reference. Also should take full account of the output of the inverter contains high harmonics, will cause the motor power factor and efficiency will be bad. Therefore, with the inverter to the motor power supply and power grid power supply compared to the motor current increased by 10% and the temperature increase of about 20%. Therefore, in the choice of motor and inverter, should take into account the situation, the appropriate margin to prevent the temperature rise is too high, affecting the motor life.
????3, the inverter to long cable operation, this time should take measures to suppress the long cable to the ground coupling capacitor, to avoid the inverter output is not enough. So the inverter should be amplified or selected to install the output reactor at the output of the inverter.
?11, the inverter drives the synchronous motor, compared with the power frequency power regulator, reduce the output capacity of 10% to 20%, the inverter's continuous output current is greater than the synchronous motor rated current and synchronous pull the current value of the unit value product.
????12, for the compressor, vibration and other torque fluctuations in the load and the hydraulic pump and other peak load case, if the motor in accordance with the rated current or power value of the inverter, then there may be due to peak current over-current protection Action phenomenon. Therefore, you should understand the frequency of the operation of the situation, select the maximum current than the maximum current output of the inverter. When the inverter drives the submersible pump motor, the rated current is greater than the rated current of the submersible pump motor because the rated current of the submersible pump motor is greater than the rated current of the normal motor.
????13, when the inverter control Roots blower, because of its large starting current, so select the inverter must pay attention to whether the capacity of the inverter is large enough.
????14, select the inverter, be sure to pay attention to whether the protection level with the scene to match. Otherwise the scene of dust, water vapor will affect the long-term operation of the inverter.
????15, single-phase motor is not suitable for inverter drive.
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??8, drive explosion-proof motor, the inverter is not explosion-proof structure, the inverter should be set in a dangerous place outside.
????9, the use of inverter drive gear motor, the use of the gear by the part of the lubrication part of the lubrication control. When lubricating oil is lubricated, there is no limit in the low speed range. If there is a high speed range above the rated speed, there is a risk that the lubricating oil may be used. Therefore, do not exceed the maximum speed allowable value.
????10, the inverter drive winding rotor asynchronous motor, most of the use of existing motor. Winding motor and ordinary squirrel-cage motor compared to the winding motor winding impedance is small. Therefore, it is prone to overcurrent trip due to ripple current, so a frequency converter larger than the normal capacity should be selected. General winding motor for flywheel torque more occasions, in the set acceleration and deceleration time should pay more attention.
???4, when the inverter is used to control several motors in parallel, be sure to consider the inverter to the motor cable length of the sum of the inverter in the allowable range. If you exceed the specified value, to enlarge one or two steps to select the inverter. In addition, in this case, the inverter control mode can only be V / F control mode, and the inverter can not protect the motor over-current, overload protection, this time in each motor on the fuse to achieve protection.
????5, for some special applications, such as high ambient temperature, high switching frequency, high altitude, etc., this time will cause the inverter derating, the inverter need to enlarge a file selection.
????6, the use of inverter control high-speed motor, due to high-speed motor reactance small, high harmonics also increase the output current value. Therefore, when selecting a frequency converter for a high-speed motor, it should be slightly larger than the inverter of an ordinary motor.
????7, the inverter for the variable pole motor, should pay full attention to select the inverter capacity, so that the maximum rated current in the inverter rated output current below. In addition, in the operation of the number of pole conversion, you should first stop the motor work, otherwise it will cause the motor idling, bad will cause damage to the inverter.
