64 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, and
• set the critical speed ranges as in the figure below.
Parameters
Parameters:
• Critical speeds 22.51…22.57.
• Critical frequencies 28.51…28.57.
• Function input (speed): 22.01
• Function output (speed): 22.87
• Function input (frequency) 28.96 Frequency ref act 7
• Function output (frequency) 28.97 Frequency ref unlimited.
540
690
1380
1560
1Par. 22.52 = 540 rpm
2Par. 22.53 = 690 rpm
3Par. 22.54 = 1380 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)
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