Program features 43
-Torque control operates at the same time level as the power switch control.
-There is no separate voltage and frequency controlled PWM modulator.
- The output stage switching is based on the electromagnetic state of the motor.
- The best motor control accuracy is achieved by activating a separate motor.
identification run (normal ID run).
Settings
• Main menu
→ Motor data or Main menu → Complete parameter list
→ Parameter 99.04.
• Parameter 99.13 ID run requested (page 177).
Speed control performance
The figure below shows the typical speed control performance.
Switching frequency
The drive has two switching frequencies: reference switching frequency and
minimum switching frequency. The drive tries to keep the highest allowed switching
frequency (= reference switching frequency) if thermally possible, and then adjusts
dynamically between the reference and minimum switching frequencies depending
on the drive temperature. When the drive reaches the minimum switching frequency
(= lowest allowed switching frequency), it starts to limit output current as the heating
up continues.
For derating, see chapter Technical data, section Switching frequency derating in the
Hardware manual of the drive.
Example 1: If you need to fix the switching frequency to a certain value as with some
external filters, set both the reference and the minimum switching frequency to this
value and the drive will retain this switching frequency.
100
t (s)
T
T
N
(%)
T
load
n
act
-n
ref
n
N
Area < 10% s
T
N
= rated motor torque
n
N
= rated motor speed
n
act
= actual speed
n
ref
= speed reference
Speed control Performance
Static accuracy 20% of motor nominal
slip
Dynamic accuracy < 10% s with 100%
torque step (with default
speed controller tuning)
Tuned speed
controller
< 2% s with 100%
torque step
ACQ80 FW.book Page 43 Thursday, February 14, 2019 11:33 AM
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