54 Program features
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 torque (99 Motor data).
540
690
1180
1560
1Par. 22.52 = 540 rpm
2Par. 22.53 = 690 rpm
3Par. 22.54 = 1180 rpm
4Par. 22.55 = 1560 rpm
1234
22.01 Speed ref unlimited (rpm)
(output of function)
22.87 Speed reference act 7 (rpm)
(input of function)
ACS180 FW.book Page 54 Tuesday, March 9, 2021 2:25 PM
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