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Programming and Parameters 3-87
PowerFlex 700S Phase II AC Drive User Manual - Publication 20D-UM006G-EN-P – July 2008
720 PLL Control
Phase Locked Loop Control.
Bit 0 “Vel FdFwd En” - When set, enables the velocity feed forward path. When cleared, the feed forward path is disabled.
Bit 1 “Ext Vel In” - When set, enables external velocity feed forward through
Par 728 [PLL Ext Spd Ref]. When cleared, velocity feed forward is derived from the
input device position.
Bit 2 “Trckng AComp” - When set, provides an element of acceleration compensation to the feed forward branch. This is not recommended for use with external
inputs because of increased noise.
Note: This parameter was added for firmware version 3.01.
721 PLL Position Ref
Physical encoder position input. This parameter is normally linked directly to the encoder
position of the device chosen for input to PLL.
Note: This parameter was added for firmware version 3.01.
Default:
Min/Max: 0.0
-/+2147483648
✓
RW 32-bit
Integer
722 PLL BandWidth
Sets the internal bandwidth response of the PLL function in (rad/sec). The setting for very
noisy mechanical systems could range from 1 to 10 (r/s) while well-behaved high line count
input devices could range upwards of 100 (r/s). Higher bandwidths will quickly resolve tracking
errors while the lower bandwidths will take longer to settle into a steady state. Some
adjustment will be necessary to effect the best compromise between noise and tracking
response.
Note: This parameter was added for firmware version 3.01.
Units:
Default:
Min/Max: R/S
20.00
0.00/8000.00
✓
RW Real
723 PLL Rev Input
Revolution of the input encoder. This parameter must be coordinated with Par 724 [PLL Rev
Out] to resolve the gear-ratio between input revolutions and output (virtual) revolutions. The
ratio of input to output revolutions can always be resolved into integer values and should be
reduced to their lowest common factor.
Note: This parameter was added for firmware version 3.01.
Default:
Min/Max: 1
-/+ 1000000 RW 32-bit
Integer
724 PLL Rev Output
Revolution of the output encoder. This parameter must be coordinated with Par 723 [PLL Rev
In] to resolve the gear-ratio between input revolutions and output (virtual) revolutions. The
ratio of input to output revolutions can always be resolved into integer values and should be
reduced to their lowest common factor.
Note: This parameter was added for firmware version 3.01.
Default:
Min/Max: 1
1/2000000 RW 32-bit
Integer
725 PLL EPR Input
Edges Per Revolution of the physical input device. Use highest line count device possible to
insure smoother PLL operation.
Note: This parameter was added for firmware version 3.01.
Units:
Default:
Min/Max: EPR
1048576
1/67108864 RW 32-bit
Integer
726 PLL EPR Output
Edges Per Revolution of virtual the physical output device.
Note: This parameter was added for firmware version 3.01.
Units:
Default:
Min/Max: EPR
1048576
1/67108864 RW 32-bit
Integer
727 PLL VirtEncdrRPM
RPM of the virtual output device. The value specified determines the 1 pu velocity at Par 734
[PLL Speed Out] and does not otherwise affect performance.
Note: This parameter was added for firmware version 3.01.
Units:
Default:
Min/Max: RPM
1750.0
1.0/30000.0 RW Real
728 PLL Ext Spd Ref
External Speed Reference. This is a velocity feed forward input. It is normally linked to an
external velocity reference or the velocity output of the chosen physical encoder.
Note: This parameter was added for firmware version 3.01.
Units:
Default:
Min/Max: P.U.
0.0
-/+2200000000.0
✓
RW Real
729 PLL Ext SpdScale
External Speed Scale. This parameter is used to properly scale the velocity feed forward.
Adjust for zero average at
Par 733 [PLL FiltPositOut] while running at moderate speed.
Note: This parameter was added for firmware version 3.01.
Default:
Min/Max: 1.0
-/+2200000000.0
✓
RW Real
730 PLL LPFilter BW
Low Pass Filter BandWidth (BW). The filter has two functions:
•
Basic noise reduction of input velocity.
•
Timed delay of input when feed forward is linked to an external master reference other than
an input encoder.
The filter BW should be set for best tracking which occurs when the filter output coincides with
the Loop filter output of PLL. Usually that means setting its BW to the bandwidth of the master
reference drive.
Note: This parameter was added for firmware version 3.01.
Units:
Default:
Min/Max: R/S
50.00
0.00/8000.00
✓
RW Real
No.
Name
Description
Values
Linkab
le
R
ead-Wr
ite
Da
ta
T
ype
Options
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Reser
ved
Tr
ck
ng
HCo
mp
Tr
ck
ng
A
C
omp
Ext V
el
In
V
el FdF
wd En
Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 = False
1 = True