ABB ACQ810, Firmware Manual

Page: 184 / 376

184 Parameters
25
25 Critical speed Configuration of critical speeds (or ranges of speed) 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
No. Name/Value Description FbEq
540
690
1380
1560
1 Par. 25.02 = 540 rpm
2 Par. 25.03 = 690 rpm
3 Par. 25.04 = 1380 rpm
4 Par. 25.05 = 1590 rpm
1 2 3 4
Motor speed
(rpm)
Drive speed
(rpm) Drive speed
(rpm)