4.6 Selecting the Motor Control Method
4-10
4.6.9 Vector control with sensor (synchronous motors)
With this control, a PG interface card must be installed. The inverter detects the motor speed and pole position
based on PG feedback signals from the motor speed/pole position sensors, and uses them to control speed. It also
breaks down the motor current into its exciting current and torque current components, and controls each of the
components as vectors. It is possible to obtain the desired response by adjusting the control constants (PI
constants) using the speed regulator (PI controller).
Sensorless vector control offers a wide speed control range, and highly-responsive speed control.
(Use of the inverter in combination with a Fuji Electric standard synchronous motor with sensor is recommended.)
Motor constants are used with sensorless vector control and vector control with sensor (synchronous
motors). Consequently, the following conditions should be satisfied; otherwise, full control performance
may not be obtained.
• A single motor should be controlled per inverter.
• Motor parameters P02*, P03*, P30*, and P60* to P63* should be properly configured or auto-tuning
should be performed.
• If the capacity of the motor being controlled is smaller than the inverter rated capacity, the current
detection resolution will deteriorate, and control performance will drop. In such cases, a motor and
inverter combination up to one rank below is recommended.
• The wiring distance between the inverter and motor should be 100 m (328.084 ft) or less. If it is longer,
the inverter may not control the motor due to leakage current flowing through stray capacitance to the
ground or between wires. Especially, small capacity inverters whose rated current is also small may be
unable to control the motor correctly even if the wiring is less than 100 m (164 ft). In that case, make
the wiring length as short as possible or use a wire with small stray capacitance (e.g., loosely-bundled
cable) to minimize the stray capacitance.
• To use the inverter with the output frequency exceeding 120 Hz, it is recommended that the carrier
frequency (F26) be set to 5 kHz or higher.
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