ZFeng 900 Series 630Kw-T-G General Vector Variable Frequency Drive
Variable Frequency Drive (VFD) is a power control device that applies frequency conversion technology and microelectronics technology to control AC motors by changing the frequency and voltage of the motor's working power supply.
Working Principle
- Core components
Rectification: Convert alternating current into direct current.
Filtering: Smooth the DC voltage and reduce harmonic interference.
Inverter: Convert direct current into alternating current with adjustable frequency and voltage.
Control unit: Implement algorithm control through a microprocessor to adjust output frequency and voltage.
- Speed regulation mechanism
V/f control: Maintain a constant voltage to frequency ratio to ensure stable motor magnetic flux.
Vector control: Independently control torque and magnetic flux to achieve high dynamic performance.
Direct torque control: Directly controlling torque and magnetic flux, with faster response speed.
Protection Function
- Overcurrent protection: Monitor current to prevent overload.
- Overvoltage protection: Monitor voltage to prevent excessive voltage.
- Undervoltage protection: Monitor voltage to prevent low voltage.
- Overload protection: Monitor the load to prevent motor overload.
- Grounding protection: prevent motor grounding faults.
- Short circuit protection: prevent output short circuit.
- Overfrequency protection: Limit the output frequency to prevent overclocking operation.
- Stall protection: prevents the motor from stalling during operation.
Selection And Usage Precautions
- Key selection points
Load characteristics: Select the appropriate frequency converter based on the load type (constant torque, constant power, square torque).
Power matching: The rated power of the frequency converter should be greater than the rated power of the motor, with a margin left.
Environmental conditions: Consider factors such as temperature, humidity, altitude, etc., and choose a frequency converter with appropriate protection level.
- Precautions for use
Installation environment: Avoid high temperature, humidity, corrosive gases, and dust.
Grounding and shielding: Ensure good grounding and reduce electromagnetic interference.
Maintenance: Regularly clean the heat sink, check cable connections to prevent overheating and loosening.
