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.