How to connect the frequency converter and how to set the speed of the frequency converter

How to connect the frequency converter

1. The power supply should be connected to the R, S, T terminals of the frequency converter input terminal, and must not be connected to the frequency converter output terminal (U, V, W), otherwise the frequency converter will be damaged. After wiring, the broken wires must be cleaned up. The broken wires may cause abnormalities, malfunctions and failures. The frequency converter must always be kept clean. When drilling holes on the console, be careful not to let debris and powder enter the frequency converter.

2. Do not connect anything other than the recommended brake resistor option between terminals + and PR, or absolutely do not short-circuit.

3. Electromagnetic interference: The input/output (main circuit) of the inverter contains harmonic components, which may interfere with the communication equipment near the inverter. Therefore, install the optional radio noise filter FR-BIF or FRBSF01 or FR-BLF line noise filter to minimize the interference.

4. When wiring over long distances, the rapid response current limiting function will be reduced due to the influence of the charging current of the parasitic capacitance of the wiring, and the instrument connected to the secondary side will malfunction and cause failure. Therefore, the maximum wiring length should be less than the specified value. If the wiring length has to exceed the specified value, set Pr. 156 to 1.

5. Do not install power capacitors, surge suppressors and radio noise filters on the output side of the variable frequency speed controller. Otherwise, it will cause the variable frequency speed controller to malfunction or damage the capacitors and surge suppressors.

6. To keep the voltage drop within 2%, use wires of appropriate types. When the wiring distance between the frequency converter and the motor is long, especially in the case of low-frequency output, the voltage drop of the main circuit cable will cause the motor torque to drop.

7. After operation, any change in wiring must be done after the power is cut off for more than 10 minutes and the voltage is checked with a multimeter. For a period of time after power failure, there is still dangerous high voltage on the capacitor.

The wiring of the frequency converter should be carried out according to the wiring diagram and wiring instructions of the frequency converter. Generally speaking, the wiring of the frequency converter includes the following aspects:

Power supply wiring: Connect the three-phase AC power supply to the power terminal of the inverter, paying attention to the matching of wiring sequence and parameters such as voltage and frequency.

Motor wiring: Connect the three-phase power supply of the motor to the motor output terminal of the inverter, and pay attention to the matching of the wiring sequence and motor parameters.

Control wiring: Connect the control signal of the inverter to the control terminal, including run, stop, speed regulation, reverse and other control signals.

External device wiring: Connect the signal of external devices (such as encoder, temperature sensor, limit switch, etc.) to the corresponding input terminal or output terminal.

Before wiring, you should carefully read the inverter wiring instructions to understand the functions and wiring methods of each terminal of the inverter to ensure that the wiring is correct. At the same time, you should pay attention to the wiring quality to ensure that the wiring is firm and reliable to avoid faults such as poor contact or short circuit.

How to set parameters of frequency converter

Parameter settings for variable frequency drives vary with different brands and models, but generally require the following steps:

Select the corresponding control mode and parameter setting template according to the actual motor type used.

Set the motor parameters according to the motor's rated voltage, rated current, power and other parameters.

Set the speed and acceleration parameters of the speed regulator according to the required speed range and acceleration.

Adjust parameters such as torque, voltage and current according to load conditions and application requirements.

According to the specific occasions and application requirements, set the functional parameters such as overload protection, fault alarm and communication interface.

Parameters are optimized based on the debugging results to achieve the best operating efficiency and control accuracy of the motor.

Before setting the parameters, you need to have a certain understanding of the relevant parameters of the frequency converter. It is recommended to read the instruction manual of the equipment in detail before operation, and set and debug under the guidance of professional technicians.

How to set the speed of the variable frequency speed regulator

The speed regulation process of the variable frequency speed regulator is usually as follows:

First, make sure the power supply of the frequency converter is connected correctly and set the basic parameters, such as motor parameters, speed range, acceleration, etc.

Connect the speed regulator to the motor and make sure the connection is correct.

Open the control panel of the speed regulator and set the desired speed value on the speed regulator or enter the desired speed value using an external controller.

Start the motor and observe whether the actual output speed is consistent with the set speed. If not, you can gradually adjust the relevant parameters of the speed regulator, such as torque, voltage, current, etc., until the actual output speed reaches the set value.

During the speed regulation process, attention should be paid to the temperature and load changes of the motor, and corresponding parameters should be adjusted as needed to ensure the normal operation of the motor and the speed control accuracy.

It should be noted that the speed regulation process of the variable frequency speed regulator requires certain professional knowledge and experience. It is recommended to read the instruction manual of the equipment in detail before operation, and perform settings and debugging under the guidance of professional technicians.