ABB ACS850 series, Firmware Manual

Page: 136 / 260

136 Parameters
24.04 Minimum torq ref Defines the minimum torque reference.
-1000.0 … 0.0% Minimum torque reference. 10 = 1%
24.05 Load share Scales the torque reference to a required level (torque
reference is multiplied by the selected value).
-8.000 … 8.000 Torque reference scaling. 1000 = 1
24.06 Torq ramp up Defines the torque reference ramp-up time, i.e. the time for
the reference to increase from zero to the nominal motor
torque.
0.000 … 60.000 s Torque reference ramp-up time. 1000 = 1 s
24.07 Torq ramp down Defines the torque reference ramp-down time, i.e. the time for
the reference to decrease from the nominal motor torque to
zero.
0.000 … 60.000 s Torque reference ramp-down time. 1000 = 1 s
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
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)