Speed Controller Autotune - ABB ACS560 Firmware Manual

The function is also available for scalar motor control with a frequency reference. The
input of the function is shown by
Example
A fan has vibrations in the range of 540...690 rpm and 1380...1560 rpm. To make the
drive avoid these speed ranges,
• set the critical speeds function by turning on bit 0 of parameter
speed function, and
• set the critical speed ranges as in the figure below.
22.01 Speed ref unlimited
(output of function)
1560
1380
690
540
Settings
• Critical speeds: parameters
• Critical frequencies: parameters


Speed controller autotune

The speed controller of the drive can be automatically adjusted using the autotune
function. Autotuning is based on an estimation of the mechanical time constant
(inertia) of the motor and machine.
The autotune routine will run the motor through a series of acceleration/deceleration
cycles, the number of which can be adjusted by parameter 25.40. Higher values will
produce more accurate results, especially if the difference between initial and
maximum speeds is small.
The maximum torque reference used during autotuning will be the initial torque (ie.
torque when the routine is activated) plus 25.38, unless limited by the maximum
torque limit (parameter group
The calculated maximum speed during the routine is the initial speed (ie. speed when
the routine is activated) + 25.39, unless limited by parameter
28.96 Frequency ref act
(rpm)
1 2 3 4
22.51...22.57
28.51...28.57
30 Limits) or the nominal motor torque
7.
1 Par. 22.52
2 Par. 22.53
3 Par. 22.54
4 Par. 22.55
22.87 Speed reference act 7
(input of function)
(page 223)
(page 247).
Program features 45
22.51 Critical
= 540 rpm
= 690 rpm
= 1380 rpm
= 1560 rpm
(rpm)
(99 Motor data).
30.12 or 99.09.