Control Methods the FR-E800 Family is able to perform

The FR-E800 inverter family stands out for its ability to offer, despite its compact size, technical features, and management capabilities akin to those found in higher-tier models. Below is an overview of the control methods available with the E800 family (speed, positioning, torque), which vary depending on the type of motor used (induction or permanent magnet).

Scalar Control: V/F

This method employs a scalar relationship between frequency and voltage. As an open-loop control system, the inverter does not require feedback from the motor, making it suitable for applications where complex positioning or dynamics are unnecessary. It is commonly used for general purposes such as pumps, fans, compressors, and spindles.

Open-Loop Vector Control:

• Advanced Magnetic Flux / Real Sensorless Vector Control (RSVC): This approach divides the output current into excitation and torque currents, allowing the inverter to adjust its magnitude as needed. It is particularly effective for conserving energy and optimizing motor usage, making it ideal for heavy-duty applications like cranes. It can deliver high torque performance at low speeds:
  • Advanced: 150% of rated torque at 1 Hz
  • RSVC: 200% of rated torque at 0.3 Hz

Closed-Loop Vector Control (FR-A8AP E KIT + Encoder):

This method requires an electrical transducer (encoder/resolver) to provide real-time feedback (position, speed, or torque) from the motor. With accurate feedback, the inverter can control the motor based on its actual performance without needing to estimate or preset values.

Application Examples and Benefits

• The range includes simple scalar V/F control methods to more sophisticated open or closed-loop controls, with or without encoder usage.
• Offers high performance at a lower cost.
• Provides versatility across various industrial applications.

For instance, the PM sensorless vector control mode allows for the control of the position and speed of a permanent magnet motor (e.g., on a palletizing line) without an encoder. By conducting offline autotuning of the motor, the inverter can estimate motor behavior and adjust frequency, current, and output voltage for precise control and positioning of pallets.

Additionally, closed-loop vector control enables accurate movement and positioning of PET bottles in filling operations, requiring an optional FR-A8AP E kit board for encoder integration.

Advantages

• Supports a broad spectrum of control methods, from basic scalar V/F to advanced open or closed-loop controls, with or without encoders.
• Delivers high performance at a more affordable price point.
• Offers flexibility and applicability across a wide range of industrial scenarios.