When commissioning the inverter on site, pay attention to the following items:
(1) Pay attention to the setting of the output frequency range. The setting of the output frequency range of the inverter is the upper and lower limit values ​​of the output frequency of the inverter. The purpose of the setting is to prevent misoperation or failure of the external frequency setting signal source And cause the output frequency to be too high or too low to prevent damage to the mechanical equipment. This setting is generally set with the maximum speed of the controlled motor or empirical value.
(2) Pay attention to the acceleration time setting. The acceleration time is the time required for the output frequency to rise from zero to the maximum frequency. The deceleration time refers to the time required for the output frequency to fall from the maximum frequency to zero. The rise and fall of the frequency setting signal are commonly used to determine the acceleration and deceleration time. When the motor is accelerating, the frequency setting rate of increase is limited to prevent overcurrent, and the decrease rate is set to prevent overvoltage when the motor is decelerating. When setting the acceleration time, attention should be paid to limit the acceleration current below the inverter's overcurrent capacity to prevent the inverter from tripping due to overcurrent; when setting the deceleration time, attention should also be paid to prevent the smoothing circuit voltage from being too large, so that the inverter will not be over-regenerated. The voltage stalls and trips. The acceleration and deceleration time can be calculated according to the load, but it is more cumbersome. The simple method is: according to the load size, set a longer acceleration and deceleration time based on experience, and then observe whether there is an over-current or over-voltage alarm through operation, and gradually shorten the setting According to the principle of not issuing an alarm during operation, repeat the operation to determine the best value.
(3) Pay attention to the setting of motor protection function in the actual project. The rated current of the motor should be used as the setting value, which is the reference value for motor overload. But it should be noted that when one inverter is used to control multiple motors, this function setting is invalid.
(4) Pay attention to the selection of igbt-related fast fuse igbt is the most important device in the inverter. It is a high-power field-effect composite tube. The manufacturer uses semiconductor fast fuse to protect it, and its fusing time is less than the blow of igbt. Wear time. If its performance changes, it will burn igbt, so the selection of the fast fuse model is very important.
(5) Pay attention to the setting of the number of automatic fault resets and the reset time. This setting is very important. In actual operation, it is inevitable that there will be some accidental faults, but they can be automatically overcome in an instant, which can ensure the smooth operation of the inverter without the need Find the point of failure.
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