Rockwell Automation 20D PowerFlex 700S AC Drives with Phase II Control Reference Manual - Manual (Page 84)

84 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
the position reference of the follower drives. Parameter 735 [PLL SpeedOut Adv]
provides a position reference that is advanced by one scan time of the drive’s
control loop. [PLL SpeedOut Adv] should be sent over SynchLink to the
follower drives and linked into the follower drives’ speed reference.
Figure 19 - Sample Phase Locked Loop Configuration
Example:
A “print” retrofit application will replace a mechanical line shaft. The slave drives
will electronically be phase locked to a folder that is controlled by an existing DC
drive. A reference encoder will be mounted to the folder with a 2/3 ratio from the
main line shaft. Rated line shaft speed is 1200 rpm. A multitude of drives of
different ratios are to be electronically geared-off the line shaft.
• Set parameter 147 [FW Functions En], bit 24 “Phase LockLp” = 1 to
enable the Phase Locked Loop function.
To keep things organized, reflect the PLL output to the old line shaft. The slave
units can then reconcile their gear ratio differences with EGR and scale speed
accordingly:
• Set parameter 723 [PLL Rev Input] = 2
• Set parameter 724 [PLL Rev Output] = 3
• Set parameter 727 [PLL VirtEncdrRPM] = 1200
Speed Trim 2
from Encdr0
from Encdr0
Speed Ref 2
Spd Ref2 Multi
from Encdr0
from Encdr0
Local Drive
SynchLink
SL Dir Data
Tx00
SL Dir Data
Tx01
Follower Drive
Phase Locked Loop Speed Control - Reference
PI
Regulator
300
Motor Spd Fdbk
302
Spd Reg PI Out
Speed Control - Regulator
Motor Speed Ref
301
743
Aux Posit Ref
Gear Rat
[ N ]
[ D ] PI
Regulator
762
Position Fdbk
Position Control
Linear Ramp
& S Curve
Speed Control - Reference
12
13
* PI
Regulator
300
Motor Spd Fdbk
302
Spd Reg PI Out
Speed Control - Regulator
Motor Speed Ref
301 +
743
Aux Posit Ref
Gear Rat
[ N ]
[ D ] PI
Regulator
762
Position Fdbk
Position Control
965 966
929 930
SynchLink
SL Dir Data
Rx01
SL Dir Data
Rx00
22
Speed Trim 2
22
Virtual
Encoder
721
Gear Rat
[ N ]
[ D ]
734
731
735
732
PLL Speed Out
PLL Posit Out
Speed Ref 2
PLLSpeedOut Adv
12
PLL Posit OutAdv 240
13
*
Spd Ref2 Multi
Linear Ramp
& S Curve
Bus Volt
& Power
Regulator
Torq Sel
305
Mtr Trq Curr Ref
Torque Control
Bus Volt
& Power
Regulator
Torq Sel
305
Mtr Trq Curr Ref
Torque Control
318
Posit Spd
Output
318
Posit Spd
Output
728
+
+
Low Pass
Filter
241
Encdr1
Spd Fdbk
(from line
shaft)
Encdr1
Position
(from line
shaft)
PLL Ext Spd Ref
PLL Position Ref
+