ABB ACS860, Руководство по прошивке

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38 Program features
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 22.51 Critical
speed function , and
• set the critical speed ranges as in the figure below.
Settings
• Critical speeds: parameters 22.51 … 22.57 (page 154 )
• Critical frequencies: parameters 28.51 … 28.57 (page 190 ).

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 Autotune repeat
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
25.38 Autotune torque step , unless limited
by the maximum torque limit (parameter group 30 Limits ) or the nominal motor torque
( 99 Motor data ). The calculated maximum speed during the routine is the initial speed
(ie. speed when the routine is activated) + 25.39 Autotune speed step , unless limited
by 30.12 Maximum speed or 99.09 Motor nominal speed .
540
690
1380
1560
1 Par. 22.52 = 540 rpm
2 Par. 22.53 = 690 rpm
3 Par. 22.54 = 1380 rpm
4 Par. 22.55 = 1560 rpm
1 2 3 4
22.01 Speed ref unlimited (rpm)
(output of function)
22.87 Speed reference act 7 (rpm)
(input of function)