LEESON FHP Series NEMA 4x Variable Speed Drive User Manual

Page 46

SLIP COMPENSATION (SLIP COMP)

Slip compensation is used to minimize the normal speed
changes occurring in an induction motor from no load to full load
conditions.

1. Using the speed adjust potentiometer or reference

signal, run the motor at the desired RPM under a no
load condition. Measure the RPM with a tachometer.

2. Without changing the speed adjust potentiometer or

reference signal, apply a full load to the motor, and bring
the motor speed back up using the SLIP COMP pot to
the originally measured RPM.

3. These procedures, (1&2), may need to be repeated

several times to reach the desired accuracy required.**

**Wide speed range accuracy of the slip compensation
method depends heavily on motor slip vs. frequency
characteristics.

Calibration Procedure Conclusion

1. Set the speed adjust potentiometer or reference signal

to zero (full CCW).

2. Disable the drive by opening the ENABLE/DISABLE

switch or removing the jumper from TB501 (E2) and
(E1) terminals.

3. Remove power to the drive and motor. Calibration is

now complete.