Should the three phase 250W motor inverter be connected by Y or triangular connection?

The output voltage of the single-phase inverter is three-phase 220V, that is, it is interchangeable, and if it is a single-phase 220V input, it is generally a triangle connection. It is suitable for the motor of 380V Y solution method to be changed to the connection method, and is generally suitable for motors below 3KW;

Variable-frequency drive (VFD) is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply. The inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, microprocessor unit, etc. The inverter relies on the interruption of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation.

With the continuous improvement of industrial automation, frequency converters have also been widely used.

Under normal circumstances, according to the output voltage of the inverter, the output voltage of 380 volts is the star connection, and the output voltage of 220 volts is the triangle connection.

There is generally a wiring method on the junction box, if the inverter is 220V single-phase, then the three-phase electricity is also 220V, if the original motor is a three-phase 380V Y-shaped connection, then it should now be connected into a triangle. Although this is the most probable, it does not rule out other possibilities because the information you gave is incomplete.

How much is used for 15kw motor inverter.

Motors below 3kw (including 3kw) adopt triangular connection; Or according to the nameplate, select the wiring method at 220 volts.

The output of the inverter is basically not related to the input, and the motor can be directly connected to the output end of the inverter, generally speaking, the motor output of the inverter is UVW. The use of 220V single-phase input is generally a small inverter, the power is less than 4kw, when using single-phase input, the input current will be about 2 times larger than the use of three-phase input, if not necessary, do not use single-phase input.

PrincipleWhen the three-phase stator winding of the motor (each with a difference of 120 degrees of electric angle), after the introduction of three symmetrical alternating current, a rotating magnetic field will be generated, which cuts the rotor winding, thereby generating an induced current in the rotor winding** The sub-winding is a closed path), the current-carrying rotor conductor will generate electromagnetic force under the action of the stator rotating magnetic field, so as to form an electromagnetic torque on the motor shaft, drive the motor to rotate, and the motor rotation direction is the same as the direction of the rotating magnetic field.

The above content reference: Encyclopedia - three-phase asynchronous motor.

After adding the inverter, if you need to control the speed of the motor, it is usually achieved by adjusting the frequency of the motor through the inverter. The wiring mode of the three-phase asynchronous motor can be triangular wiring or star wiring, but when the inverter is used, it is recommended to use the star wiring mode to access the inverter, which is also called YZ conversion. Because the star wiring can make the motor maintain a high insulation resistance at low frequency, improve the anti-interference ability and reliability of the motor; The triangle wiring is easy to cause the insulation weakening of the motor when working in the low frequency band, and even cause faults such as winding short circuit.

After using star wiring to access the inverter, the PWM control technology of the inverter can effectively control the frequency and voltage of the motor without causing damage to the motor itself. It should be noted that before accessing the inverter, it is necessary to ensure that the rated voltage of the motor matches the output voltage of the inverter, and at the same time, it is also necessary to pay attention to the selection and debugging of the inverter to avoid damage to the motor due to improper parameter setting.

Single-phase 220V inverter and single-phase motor cannot be connected. In this case, the inverter will judge that the motor is faulty. If the inverter has the function of shielding phase loss protection and the function of setting the output voltage, it can be used.

However, the capacity of the inverter needs to be checked according to the output current. If the inverter does not have the above functions, the protection of the inverter will start and stop the output. Single-phase is not accepted.

The inverter adjusts the voltage and frequency of the output power supply by the switching of the internal IGBT, according to.

With the same power motor triangle connection method to change to Y connection inverter, what should be changed to the number of bridge training? Hello dear, the inverter to be replacedFirst of all, to determine the power of the inverter to be replaced, it must be greater than or equal to the inverter to be replaced. Secondly, the input voltage, the low-power inverter has two input voltages, single-phase 220 volts and three-phase 380 volts.

The motor of the ordinary single-phase 220-volt inverter should be a medium-sized triangle connection, and the motor of a three-phase 380-volt inverter should be Y-shaped. When the inverter does not switch with the input voltage, please pay attention to the connection method of the motor. Finally, there are hundreds of parameters for the inverter.

Depending on the needs of the work, many of them do not need to be set by us, and the system defaults. There are only a few things we need to set. 1. Main frequency input ** setting.

Generally, the default main frequency input is controlled by a digital operation panel. There are several options, including analog voltage signal input, analog current signal output, control input by communication RS485, panel knob control input, etc., according to the actual work needs of the inverter, I will not introduce it in detail here. 2. Input of operation control signal.

By default, the manufacturer also controls the digital operation panel, and sets the control mode you need according to the needs to determine whether it is controlled by external terminals or RS485 communication. 3. If there are multiple speed options, you need to set the multi-speed parameters. 4. The setting of the multi-function input terminal.

Set the function of each terminal as needed. 5. Setting of acceleration and deceleration time. The time is too short, and it is easy to overload the alarm.