ABB ACS850-04 - Critical Speed

Parameters 167
25
25 Critical speed
Sets up critical speeds, or ranges of speeds, that are avoided
due to, for example, mechanical resonance problems.
25.01 Crit speed sel Enables/disables the critical speeds function.
Example: A fan has vibrations in the range of 540 to 690 rpm
and 1380 to 1560 rpm. To make the drive to jump over the
vibration speed ranges:
• activate the critical speeds function,
• set the critical speed ranges as in the figure below.
Disable Critical speeds are disabled. 0
Enable Critical speeds are enabled. 1
25.02 Crit speed1 lo Defines the low limit for critical speed range 1.
Note: This value must be less than or equal to the value of
25.03 Crit speed1 hi.
-30000 … 30000
rpm
Low limit for critical speed 1. 1 = 1 rpm
25.03 Crit speed1 hi Defines the high limit for critical speed range 1.
Note: This value must be greater than or equal to the value of
25.02 Crit speed1 lo.
-30000 … 30000
rpm
High limit for critical speed 1. 1 = 1 rpm
25.04 Crit speed2 lo Defines the low limit for critical speed range 2.
Note: This value must be less than or equal to the value of
25.05 Crit speed2 hi.
-30000 … 30000
rpm
Low limit for critical speed 2. 1 = 1 rpm
25.05 Crit speed2 hi Defines the high limit for critical speed range 2.
Note: This value must be greater than or equal to the value of
25.04 Crit speed2 lo.
No. Name/Value Description FbEq
540
690
1380
1560
1Par. 25.02 = 540 rpm
2Par. 25.03 = 690 rpm
3Par. 25.04 = 1380 rpm
4Par. 25.05 = 1590 rpm
1234
Motor speed
(rpm)
Drive speed
(rpm)
Drive speed
(rpm)