When selecting a factory, prioritize technical parameters such as Input/Output Voltage (110V/220V/380V), Maximum Current Capacity, and Frequency Range (typically 40Hz-400Hz). Ensure the controllers feature Soft-Start technology to protect the vibratory equipment and Automatic Voltage Regulation (AVR) to maintain consistent vibration amplitude despite power fluctuations. For digital controllers, verify the LED/LCD display accuracy and the availability of RS485 or Modbus communication interfaces for PLC integration.