Programming  
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D  Page D-55 
8 
9 
10 
11 
 
B 
C 
D 
1 
2 
3 
4 
5 
6 
7 
E 
INERTIA COMP 
SETUP::MOTOR CONTROL::INERTIA COMP 
This block is used to provide a torque feed forward to compensate for friction and inertia effects whilst the drive is running. 
 
Parameter Descriptions 
FRICTION @ 0 RPM 
PREF: 122.01  Default: 0.00 %  Range: 0.00 to 100.00 % 
Static friction compensation gain. 
FR'N @ NMPLT RPM 
PREF: 122.02  Default: 0.00 %  Range: 0.00 to 100.00 % 
Dynamic Friction compensation gain. 
RELATIVE INERTIA 
PREF: 122.03  Default: 0.00 %  Range: 0.0000 to 
30000.0000 % 
Inertia compensation gain. 
FRICTION COMP 
PREF: 122.04  Default: —.xx %  Range: —.xx % 
This diagnostic shows Torque Feedforward component due to friction compensation. 
INERTIA COMP 
PREF: 122.05  Default: —.xx %  Range: —.xx % 
This diagnostic shows the Torque Feedforward component due to inertia compensation. 
TORQ FEEDFORWARD 
PREF: 122.06  Default: —.xx %  Range: —.xx % 
This diagnostic shows the Total torque feedforward. 
SPEED PI OUTPUT 
PREF: 122.07  Default: —.xx %  Range: —.xx % 
This diagnostic shows the Speed Loop Output – it is provided here to assist with tuning compensation values.