Rockwell Automation 20D PowerFlex 700S Drive Ph I Control, Frames 1...11 User Manual
Page 85
Programming and Parameters
3-31
224
TachSwitch Level
Sets the detection level for the automatic tach loss switchover routine. A drop in feedback
speed at this percent of rated speed over 0.5 msec will cause a tach switch from the
primary to alternate feedback device. This feature is enabled when bit 16 [Auto Tach Sw]
in Par 153 [Control Options] is selected.
Setting this level lower will make the tach switch detection more sensitive and lower the
minimum speed at which a tach switch can occur. Setting this level higher will make the
tach switch less sensitive and raise the minimum speed for tach switch detection.
Units:
Default:
Min/Max:
%
10.0000
5.0000/25.0000
✓
226
Virtual Edge/Rev
Set the EPR (Edges Per Revolution) scaling for calculating motor position. Used in the
calculation of the position feedback such as Par 70 [MtrSpd Sim Posit].
Units:
Default:
Min/Max:
EPR
4096
10/16777216
✓ 32-bit
Integer
227
Spd Obs Trq Gain
Multiplication factor for the inertia input to the Speed Observer. If the specified inertia
differs from actual, this value is used to fine tune the inertia value input to the observer.
Normally set to 1.
Default:
Min/Max:
1.0000
0.0000/2.0000
✓ ✓ Real
230
Encdr0 Position
Displays the position feedback (accumulator) from encoder 0. The value changes by a
value of 4 times the Pulses Per Revolution (PPR) rating of the encoder for each full
revolution of the encoder shaft. Used by the Velocity Position Loop (VPL) to close the
position loop if the position control is selected.
Default:
Min/Max:
0
-/+2147483648
32-bit
Integer
231
Encdr0 Spd Fdbk
Displays the speed feedback from encoder 0. Calculated from the change of Par 230
[Encdr0 Position] and Par 232 [Encoder0 PPR].
Units:
Default:
Min/Max:
Comm Scale:
RPM
0.0000
-/+14112.0000
Par 4 [Motor NP RPM] = 1.0
Real
232
Encoder0 PPR
Sets the PPR rating of the feedback device connected to the Encoder 0 input.
Units:
Default:
Min/Max:
PPR
1024
10/20000
✓ 16-bit
Integer
No.
Name
Description
Values
Li
nkab
le
Read
-Wr
it
e
Da
ta
T
ype