Rockwell Automation 6000 PowerFlex Medium Voltage Variable Frequency Drive Commissioning Manual - Manual (Page 91)

Rockwell Automation Publication 6000-IN007A-EN-P - October 2014 91
Special Function Parameter Settings Appendix C
Frequency Amplitude Limit
Relevant parameter: P413, P415
Description: this function limits the amplitude of the Set Frequency. The Set
Frequency must not exceed the maximum output frequency of the drive.
Instruction: this function can limit the Set Frequency between P413 and P415,
P415>P413>0.
Frequency Skip
Relevant parameter: P89, P90, P91, P92, P93
Description: this function is designed to avoid a trip at certain output
frequencies.
Instruction: this function is enabled by P89. There are two bands, one is between
P90 and P91, the other is between P92 and P93. The Set Frequency can skip out
from these two bands if it is within them. The Set Frequency will be changed
automatically into the upper limit of the bands while the speed increases, or
changed into the lower limit of the band while the speed decreases (
Figure 22 ).
The recommended width of these intervals is 1 Hz.
Figure 22 - Principle diagram of Frequency Skip Function
fB2
fB1
fA2
fA1
User Set Frequency
Driv
e R
ec
ogni
ze
Fr
equ
en
cy
P90 P91 P92 P93