Slip Compensation - Larsen & Toubro C*2000 Series User Manual

H31: Enter the pole number on the Motor nameplate.

 H32: Enter the slip frequency in accordance with the following formula and motor nameplate.
f f
s r
Where,
fs = Rated slip frequency
f r = Rated frequency
rpm = Motor rated RPM
P = Motor pole number
Ex) Rated freq.: 60Hz, Rated RPM: 1740rpm, Poles: 4,
H33: Enter the motor nameplate rated current.

 H34: Enter the measured current when the motor is running at rated frequency after the load is
removed. Enter 50% of the rated motor current when it is difficult to measure the motor no load current.
H36: Enter motor efficiency on the nameplate.

H37: Select load inertia based on motor inertia as shown below.

H37
As the loads are heavier, the speed gap between rated RPM and synchronous speed is widening (see

the figure below). This function compensates for this inherent slip.
Cx2000 AC Drive
rpm P
120
1740 4
f 60 2
s
120
Load inertia rate
R P M
Hz
0 Less than 10 times motor inertia
1 About 10 times motor inertia
2 Greater than 10 times motor inertia
S yn ch ro n o u s
sp e e d
S lip
co m p e n sa tio n
M o to r re te d
R P M
L o a d
Chapter 8 Application
8-9