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16 E300 Design Guide
Issue Number: 1
2.5 Operating modes
The E300 Advanced Elevator drive is designed to operate in any of the following modes, with the default operating mode being RFC-S.
Open loop mode
Open loop vector mode
Fixed V/F mode (V/Hz)
RFC - A, Closed loop vector
With position feedback sensor
Sensorless mode without position feedback for rescue operation
RFC - S, Closed loop Servo
With position feedback sensor
Sensorless mode without position feedback for rescue operation
2.5.1 Open loop mode
The drive applies power to the motor at frequencies varied by the user. The motor speed is a result of the output frequency of the drive and slip due
to the mechanical load. The drive can improve the speed control of the motor by applying slip compensation. The performance at low speed depends
on whether Fixed V/F mode or Open loop vector mode is selected.
Vector mode
The voltage applied to the motor is directly proportional to the frequency except at low speed where the drive uses motor parameters to apply the
correct voltage to keep the flux constant under varying load conditions. Typically 100 % torque is available down to 1 Hz for a 50 Hz motor.
Fixed V/F mode
The voltage applied to the motor is directly proportional to the frequency except at low speed where a voltage boost is provided which is set by the
user. This mode can be used for multi-motor applications. Typically 100 % torque is available down to 4 Hz for a 50 Hz motor.
2.5.2 RFC-A
Rotor Flux Control for Asynchronous induction motors RFC-A encompasses closed loop vector control with a position feedback device
With position feedback
For use with induction motors with a feedback device installed. The drive directly controls the speed of the motor using the feedback device to ensure
the rotor speed exactly as demanded. Motor flux is accurately controlled at all times to provide full torque all the way down to zero speed.
Sensorless mode without position feedback for rescue operation
Sensorless mode provides closed loop control without the need for position feedback by using current, voltages and key motor parameters to
estimate the motor speed.
2.5.3 RFC- S
Rotor Flux Control for Synchronous permanent magnet brushless motors RFC-S provides closed loop control with position feedback device.
With position feedback
For use with permanent magnet brushless motors with a feedback device installed. The drive directly controls the speed of the motor using the
feedback device to ensure the rotor speed is exactly as demanded. Flux control is not required because the motor is self excited by the permanent
magnets which form part of the rotor. Absolute position information is required from the feedback device to ensure the output voltage is accurately
matched to the back EMF of the motor. Full torque is available all the way down to zero speed.
Sensorless mode without position feedback for rescue operation
Sensorless mode provides closed loop control without the need for position feedback by using current, voltages and key motor parameters to
estimate the motor speed.
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