Application and Operation of Frequency Inverter in Industrial Fans
VFD Speed Controller for High Volume Low Speed(HVLS) Industrial Fans
1. Working Principle
The frequency converter transforms the standard AC power supply (e.g., 50Hz or 60Hz) into an AC power supply with adjustable frequency and voltage. By modifying these parameters, the motor speed is adjusted, thereby controlling the airflow of the fan.
2. Connection Steps
Power Connection: Connect the input terminal of the frequency converter to the standard power supply (e.g., 380V/50Hz).
Motor Connection: Connect the output terminal of the frequency converter to the motor of the industrial fan.
Control Signal Connection: Based on requirements, connect the control terminals of the frequency converter to the control system, such as a PLC or manual speed regulator.
3. Parameter Settings
Basic Parameters: Set the motor's rated power, voltage, current, and frequency.
Control Mode: Select the control mode, such as speed control, torque control, or PID control.
Acceleration/Deceleration Time: Set the acceleration and deceleration times during startup and shutdown to ensure smooth operation.
Protection Parameters: Set protection parameters for overcurrent, overvoltage, undervoltage, and overheating to ensure safety.
4. Startup and Operation
Startup: After the frequency converter starts, it gradually increases the output frequency and voltage, allowing the motor to slowly accelerate to the set speed.
Operation: Based on the control signals, the frequency and voltage are adjusted in real-time to maintain the required speed.
Shutdown: During shutdown, the frequency converter gradually reduces the frequency and voltage, allowing the motor to decelerate smoothly to a stop.
5. Feedback and Adjustment
Feedback Signals: Obtain motor speed and load information through sensors or encoders, and feed this back to the frequency converter.
Closed-Loop Control: Adjust the output based on the feedback signals to achieve precise control.
6. Protection Functions
Overload Protection: Automatically reduces output or shuts down when an overload is detected.
Short Circuit Protection: Immediately cuts off the output when a short circuit is detected.
Overheating Protection: Automatically reduces output or shuts down when overheating is detected.
7. Advantage
1. All-in-one machine, no need for distribution box, saving installation time.
2. Mute control, support up to 16K carrier frequency.
3. High appearance and simple operation.
4. Parameters are packed without debugging.
5. Speed tracking is on.
6. More energy efficient.
