Frequency conversion speed regulation motor is generally selected 4-level motor, the fundamental frequency operation point is planned at 50Hz, the frequency of 0-50Hz (speed 0-1480r/min) scale of the motor for constant torque work, the frequency of 50-100Hz (speed 1480-2800r/min) scale of the motor for constant power work, the entire speed regulation scale of (0-2800r/min), fundamentally meet the requirements of general drive equipment, its operating characteristics are the same as DC speed regulating motor, speed regulation smooth and stable. If you want to increase the output torque within the constant torque speed regulation scale, you can also choose a 6-stage or 8-stage motor, but the volume of the motor is relatively larger.
When the inverter is running under load or in an area with poor power supply quality, the inrush current caused by the action of the electromagnetic switch and the communication contactor will cause the overcurrent maintenance circuit to reverberate. Therefore, it is best not to use electromagnetic switches or communication contactors at the input end (single-phase, three-phase communication power supply).
Therefore, we can use the motor maintainer as a circuit breaker that does not operate often, and directly connect it to the input loop.
However, when selecting a maintainer with this structure, it should be noted that although it has the maintenance functions of overvoltage, overcurrent and short-circuit maintenance, it is necessary to select the motor maintainer according to the rated output power when inputting. It is best to adjust the rated current of the maintainer to the maximum. When the appropriate motor is selected, thermal maintenance can be performed on the motor. If the motor does not match the rated capacity, it is necessary to adjust the internal maintenance value or adopt other maintenance measures to ensure the safe operation of the motor. Simply understood as the maintainer is connected to the input side, which is a circuit breaker.
The motor maintainer can be used to communicate with the motor starter, suitable for the circuit with a communication voltage of 690 V and a current of 80A, as an overload, phase break, short circuit maintenance and infrequent starting control of the three-phase squirrel cage asynchronous motor, it can be used for distribution line maintenance and infrequent load conversion, and can also be used as an isolator.
When other wiring, it must be noted that R, S, and T need to be marked at the input end, and U, V, and W at the output end. It is forbidden to reverse the input side with the output side.
In order to ensure the safety of the inverter, it is necessary to be safely grounded when cooperating with the motor, and the grounding wire (PE) is generally a copper core wire with a diameter of more than 3.5mm2, and the grounding resistance is less than 10Ω, which is due to the leakage current of the equipment itself.
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Variable Frequency Drive (VFD) uses inverter technology and microelectronics to change the operating power frequency of the motor to control the power control unit of the communication motor.
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1. Overpressure leads to brake pipe breakdown.
The so-called overvoltage of the inverter refers to the fact that the inverter voltage composed of various reasons exceeds the rated voltage, which is reflected in the DC voltage of the inverter DC bus.
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Senlan identifies the fault place of the inverter
How to distinguish where the inverter is wrong?
Step 1: Static data checking
1. Check the inverter circuit
The red watch rod is received to the P end, and the black watch rod is separated from U, V, and W, and there should be a resistance value of tens of ohms, and the resistance value base of each phase, the same, the opposite should be infinite.
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The key points of the use of inverter - Sunland inverter
In order to ensure the safe, efficient and reliable operation of the inverter, the following keys should be grasped when using the inverter:
1) It is necessary to reliably ground the grounding terminal of the inverter, so as to effectively press the radio frequency disturbance and enhance the reliability of the system.
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Switching power supply failure maintenance - Senlan
In the process of repairing the switching power supply, the step-down method can be selected. The method is: by connecting the power plug of the display to a communication voltage regulator, and then adjusting the output voltage of the voltage regulator to about 100V, and then repairing it with electricity, and gradually improving the power supply voltage for repair. ...
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Precautions for inverter selection and capacity matching - Senlan
1. Select the inverter according to the load characteristics
Second, when selecting the inverter, the current value of the practical motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, it should be fully considered that the output of the inverter contains higher harmonics, which will form the power factor of the motor.
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Attention to the shortcomings of the inverter - hope Senlan
The wiring interval between the motor and the inverter is too long, causing the new motor to catch fire
Burn two new motors in a row! The output current and voltage of the inverter are balanced, the input voltage is balanced, the current is unstable, the fluctuation is 20%-50%, the inverter is burned off by a short circuit between 35Hz turns, the grid voltage is very stable, 720V, ...
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(1) The VFD should be installed in the control cabinet.
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Inverter water inlet maintenance method - Sunland inverter
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Advantages of choosing a frequency converter
Advantage 1: Energy saving
The motor adopts frequency converter speed regulation, and its power can be improved by 5%-10%.
The inverter accounts for 20%-30% of the total capacity of the communication motor in the drag of load equipment such as fans, pumps, extruders, mixers, etc., which has a significant energy-saving effect, because the consumption of the fan and water pump is significant.
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Inverter maintenance method - hope sunland
1. Look
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Introduction of Sunland inverter
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