Rockwell Automation GV3000/SE AC Gen. Purpose & Vector Bookshelf Drive Start-Up and Reference Manual - Manual (Page 170)

4-84 GV3000/SE AC Bookshelf Drive Software Reference, Version 6.06
Losses compensation is the scaled output of the speed loop S/Ramp block (speed
reference). It is added to the speed loop output and the inertia compensation signal to
produce the final torque reference.
Refer to the speed loop block diagram in Appendix H.
For SVC operation, in the absence of a speed feedback device, operation of the speed
loop is based on an estimated speed feedback. Estimated speed feedback is based
on knowing the slip of the motor, which changes with motor temperature. This
parameter is provided to accommodate various operating conditions.
For a cold motor, the typical value should be 0.80. For a hot motor, the value should be
1.0.
U.028 Losses Compensation Gain
This parameter
specifies the gain
applied to the speed
loop reference signal
to generate the
losses compensation
signal. The result is
added to the speed
PI output to produce
the torque reference
signal. Parameter Range: 0.0 to 1.000
Default Setting: 0.0 (Disable losses compensation)
Parameter Type: Tunable
Refer also to parameters: U.026 Current Compounding Gain
U.027 Inertia Compensation Gain
U.030 SVC Slip Adjust
This parameter
adjusts the slip
compensation to
match the operating
temperature of the
motor.
This feature applies
to SVC operation
only.
Parameter Range: 0.50 to 1.50
Default Setting: 1.00
Parameter Type: Tunable
Refer also to parameters: N/A