ABB ACS280, Firmware Manual, Page: 39 / 430

Program features 39
Example
A fan has vibrations in the range of 540 to 690 rpm and 1180 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
,
and
• set the critical speed ranges as in the figure below.
Settings and diagnostics
• Critical speeds - Parameters
22.51
…
22.57
.
• Critical frequencies - Parameters
28.51
…
28.57
.
• Function input (speed) - Parameter
22.01 Speed ref unlimited
.
• Function output (speed) - Parameter
22.87 Speed reference act 7
.
• Function input (frequency) - Parameter
28.96 Frequency ref act 7
.
• Function output (frequency) - Parameter
28.97 Frequency ref unlimited
.
Events: -
 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
(that is, torque when the routine is activated) plus
25.40
, unless limited by the
maximum torque limit (parameter group
30 Limits
) or the nominal motor
540
690
1180
1560
1 Par.
22.52
= 540 rpm
2 Par.
22.53
= 690 rpm
3 Par.
22.54
= 1180 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)