-
Convert fixed voltage and fixed frequency into devices with adjustable voltage and frequency.
-
Rectification section, filtering and braking section, and inverter section.
-
Reaching over 95%.
-
Limit the charging current of the bus capacitor to reduce the current impact on the rectifier bridge and front-end switch.
-
No, there is a risk of explosion.
-
View through the shift keys on the control panel.
-
A resistor with the same resistance as the pressure gauge (approximately 400 ohms) needs to be connected in series to prevent damage to the 10V power supply of the VFD and the pressure gauge (the working voltage of the pressure gauge is less than 6V, and a resistor is connected in series for voltage division).
-
Automatic torque boosting can obtain a larger starting torque, but sometimes it is unstable. It can be changed to manual torque boosting. Setting this parameter correctly has a good effect on handling motor stalling.
-
When the motor load increases, increase the output frequency appropriately to maintain a stable motor speed.
-
The VFD increases the stator magnetic flux by increasing the stator voltage, thereby increasing the braking torque of the motor to achieve rapid braking; Simultaneously increasing the stator magnetic flux of the motor can generate more stator excitation losses during the braking process to reduce energy feedback.
-
The VFD supplies direct current to the motor, generating a fixed magnetic field. The motor cuts the magnetic field to generate electricity, and consumes kinetic energy in the form of heat energy on the rotor, causing the motor to quickly stop.
-
Energy consumption braking is a braking method that converts the generated electricity during deceleration into thermal energy from braking resistors, thereby achieving rapid deceleration.
-
Short distance is within 20 meters, medium distance is between 20-100 meters, and long distance is above 100 meters.
-
(1) Choose the power level of the first level inverter;
(2) Adding an output reactor can effectively suppress the instantaneous high voltage generated during IGBT switching of the frequency converter, reducing the adverse effects of this voltage on cable insulation and motor.
-
(1) Check before powering on;
(2) Power on inspection and parameter setting;
(3) Motor no-load debugging;
(4) Debugging with load.
-
The VFD achieves energy saving by reducing voltage with light load, and the output voltage of the VFD increases with the increase of output frequency. That is, when the operating frequency is lower than the power frequency, it is energy-saving (a fan can achieve the required air volume as long as it operates at a frequency of 45Hz, and its ratio to the electricity consumption during power frequency operation is calculated as 45 ^ 3/50 ^ 3 * 100%=72.9%, which means the power saving is 100% -72.9%=27.1%).
-
V/F sine pulse width modulation mode, open-loop vector control mode, closed-loop vector control mode.
-
During variable frequency speed regulation, the magnetic circuit of the motor varies significantly with the operating frequency, which can easily cause severe saturation of the motor's magnetic circuit, resulting in severe distortion of the excitation current waveform and the generation of high peak currents. Therefore, the frequency and voltage should be changed proportionally, that is, while changing the frequency, the output voltage of the VFD should be controlled to maintain a certain magnetic flux of the motor and avoid the occurrence of weak magnetism and magnetic saturation phenomena.
-
Setting a speed detector (PG) for the motor device used and feeding back the actual speed to the control device for control is called "closed-loop control", while operating without PG is called "open-loop control".
-
The energy consumption of the VFD is 3% -4%
