Rockwell Automation 1336VT AC DRIVE 5-300AMP (2-160KW) PROGRAMMING MANUAL - Manual (Page 46)

Local and Serial Port Parameters
Firmware Version 1.01-3.01
Chapter 3
3-32
Parameter 42 Ċ Slip
An “at speed” circuit in the drive monitors drive output frequency. As long
Compensation
as the input speed reference to the drive remains constant, the hertz set by
(cont.)
Parameter 42 will be proportionally added to the drive output frequency. If
the speed command to the drive is increased or decreased, slip
compensation will not be added until the command speed matches the
drive output frequency.
For a given command speed, Parameter 42, should be set to produce the
minimum amount of variation in motor speed as the motor load varies.
If the motor speed decreases as motor load increases, the value of
Parameter 42 should be increased. If the motor speed increases as motor
load increases, the value of Parameter 42 should be decreased. If slip
compensation for fully loaded motors is desired, an initial setting of 1.7 for
Parameter 42 is recommended.
Important: Slip compensation cannot increase the drive output frequency
above the Maximum Frequency set by Parameter 19. If Maximum
Frequency was selected as the optimum full speed before Slip
Compensation, Parameter 19 must be set higher to allow Slip
Compensation to work at that frequency.
For example:
A typical operating range may be 0 to 60 Hz with Maximum Frequency,
Parameter 19, set to 60 and Slip Compensation, Parameter 42, set to 1.7.
These settings will not allow the drive to add slip compensation at a
commanded frequency of 60 Hz. The Maximum Frequency, Parameter 19,
would have to be reset to 62 Hz to allow slip compensation to be effective
at a commanded speed of 60 Hz.
Parameter 43 Ċ Dwell Frequency
Freq P R
P R Enter Hertz
0
120
0
Read and Write
Units
Minimum Value
Maximum Value
Factory Setting
This parameter is not typically used in variable torque applications and
should not be changed from its factory setting.