5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
F42 = 4: Dynamic torque vector control with speed sensor
The difference from “V/f control with speed sensor” stated above is to calculate the motor torque that matches to
the load applied, and use it to optimize the voltage and current vector output for getting the maximal torque from
the motor. This is effective for improving the system response to external disturbances such as load fluctuations,
and the motor speed control accuracy.
Speed detection is performed, but the motor starts based on the H09: Auto search mode setting. The
motor starts from the speed detection value only if auto search is enabled with function code H09 set to
1 or 2. If H09 = 0 (factory default), the speed detection value is ignored, and the motor starts from the
starting frequency.
F42 = 5: Speed sensorless vector control
This control estimates the motor speed based on the inverter's output voltage and current, and uses the estimated
speed for speed control. It also decomposes the motor drive current into the exciting and torque current components,
and controls each of those components as vectors. No PG (pulse generator) interface card is required. It is possible
to obtain the desired response by adjusting the control constants (PI constants) using the speed regulator (PI
controller).
With vector control, a difference (voltage margin) is required between the voltage that the inverter is capable of
outputting and the motor induced voltage to a certain extent in order to control the motor current. Generally speaking,
general-purpose motors are designed for use with commercial power supplies, but due to the need for this voltage
margin, it is necessary to control the current by suppressing the motor terminal voltage. By doing so, it is not possible
to deliver rated torque even when the original motor rated current is flowing. To ensure that the rated torque is
delivered, it is necessary to increase the rated current (the same applies with vector control with speed sensor).
F42 = 6: Vector control with speed sensor
This control requires an optional PG (pulse generator) and an optional PG interface card to be mounted on a motor
shaft and an inverter, respectively. The inverter detects the motor’s rotational position and speed according to PG
feedback signals and uses them for speed control. It also decomposes the motor drive current into the exciting and
torque current components, and controls each of components as vectors.
It is possible to obtain the desired response by adjusting the control constants (PI constants) using the speed
regulator (PI controller).
(Use of the inverter in combination with a dedicated Fuji motor for vector control (VG motor) is recommended.)
F42 = 15: Sensorless vector control (synchronous motors)
This control estimates the motor speed based on the inverter's output voltage and current, and uses the estimated
speed for speed control. It also decomposes the motor drive current into the exciting and torque current components,
and controls each of those components as vectors. No PG (pulse generator) interface card is required. It is possible
to obtain the desired response by adjusting the control constants (PI constants) using the speed regulator (PI
controller).
F42 = 16: Vector control with speed sensor (synchronous motors)
This control requires an optional PG (pulse generator) and an optional PG interface card to be mounted on a motor
shaft and an inverter, respectively. The inverter detects the motor’s rotational position and speed according to PG
feedback signals and uses them for speed control. It also decomposes the motor drive current into the exciting and
torque current components, and controls each of components as vectors.
It is possible to obtain the desired response by adjusting the control constants (PI constants) using the speed
regulator (PI controller).
(Use of the inverter in combination with a dedicated Fuji synchronous motor for vector control (GNF motor) is
recommended.)
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