Rockwell Automation 20D PowerFlex 700S AC Drives with Phase II Control Reference Manual - Manual (Page 153)

Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011 153
Detailed Drive Operation Chapter 1
The speed trim values are summed with the speed reference from the speed
reference control loop.
Autotune Speed Reference
During the inertia test, the autotune speed reference is used instead of the output
of the speed trim summation. Parameter 74 [Atune Spd Ref ] sets the speed for
the inertia test. Bit 4 “Inrta Tst En” of parameter 157 [Logic Ctrl State] turns on
during the inertia test and allows the autotune speed reference to bypass the
output of the speed trim summation.
Speed Reference Limits
At this point the summed speed reference is limited by parameters 75 [Rev Speed
Limit] and parameter 76 [Fwd Speed Limit]. These limits are set to -125% and
125% of parameter 4 [Motor NP RPM] by default. The maximum value of [Rev
Speed Limit] and [Fwd Speed Limit] are limited by parameter 532 [Maximum
Freq].
0
Autotune
Bypass
74
157 04
Atune Spd Ref
to Speed
Limits from Speed Trim
Logic Ctrl State
(Inrta Tst En)
1
75
76
Limit
Rev Speed Lim
to Current
Limit Stop
from Autotune
Bypass
Fwd Speed Lim