Speed Controller Autotune - ABB +N5600 Firmware Instructions

reference exits the range. Any instant change in the output is smoothed out by the
ramping function further in the reference chain.
The function is also available for scalar motor control with a frequency reference. The
input of the function is shown by
Frequency ref unlimited.
Example
A fan has vibrations in the range of 540 to 690 rpm and 1380 to 1560 rpm. To make
the drive avoid these speed ranges,
• enable 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
times. 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
by the maximum torque limit (parameter group
28.96 Frequency ref act
(rpm)
1 2 3 4
22.51...22.57
28.51...28.57
7, the output by
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 254)
(page 290).
25.40 Autotune repeat
25.38 Autotune torque
30 Limits) or the nominal motor torque
Program features 81
28.97
22.51 Critical
= 540 rpm
= 690 rpm
= 1380 rpm
= 1560 rpm
(rpm)
step, unless limited