ABB ACQ80-04 Series, Firmware Manual

Page: 43 / 270

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