Learning Advanced Features
Sensorless Vector Control Operation Setting Details for Induction Motors
Sets pre-excitation time. Pre-excitation is used at the start of the
operation to perform excitation up to the motor’s rated flux.
Allows for the reduction of the pre-excitation time. The motor flux
increases up to the rated flux with the time constant as shown in
the following figure.
To reduce the time taken to reach the rated flux, a higher motor
flux base value than the rated flux must be provided. When the
magnetic flux reaches the rated flux, the provided motor flux base
value is reduced.
Sets the zero-speed control time (hold time) after deceleration in
the stopped position. The output is blocked after the Hold Time.
For details of the following parameter settings, refer to p.122 in the
5.10.2
Cn.21 Out Trq. Comp.
Gain at Low Spd
Cn.21 has an effect on the low-speed operations..
Cn.22 ScaleOut Trq.
Comp. Gain
Cn.22 is related to the torque load quantity that can be produced
by the inverter.
Cn.23 Spd. Comp. Sub
Gain
Cn.23 has an effect on the motor speed.
Cn.24 Spd. Comp.
Main Gain
Cn.24 has an effect on the motor speed.
Cn.29 Spd. Comp. Gain
at No-load
Cn.29 mostly has an effect on the error level of the estimated
frequency during no load.
Cn.30 Spd. Response
Adjustment Gain
Cn.30 is the value that is mainly changed according to the load
inertia.
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