Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 266)

266 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 4 Motor Control
Speed Torque Position The PowerFlex 750-Series drives have the ability to have four separate Speed
Torque Position modes with the following parameters:
• P309 [SpdTrqPsn Mode A]
• P310 [SpdTrqPsn Mode B]
• P311 [SpdTrqPsn Mode C]
• P312 [SpdTrqPsn Mode D]
Possible selections for the above Speed/Torque/Position parameters are as
follows:
• “Zero Torque” (0) – Drive operates as a torque regulator with P685
[Selected Trq Ref ] forced to a constant value of zero torque.
• “Speed Reg” (1) – Drive operates as a speed regulator. P685 [Selected Trq
Ref ] comes from P660 [SReg Output] plus P699 [Inertia Comp Out].
• “Torque Ref ” (2) – Drive operates as a torque regulator. P685 [Selected
Trq Ref ] comes from P4 [Commanded Trq]. Under some conditions such
as jogging or performing a ramp to stop operation, the drive automatically
bypasses this selection and temporarily switches to Speed Regulation
mode.
• “SLAT Min” (3) – Drive operates in “Speed Limited Adjustable Torque –
Minimum select” mode. This is a special mode of operation used primarily
in web handling applications. The drive typically operates as a torque
regulator, provided that the P4 [Commanded Trq] value is algebraically
smaller in value than the speed regulator’s output. The drive can
automatically enter Speed Regulation mode, based on conditions within
the speed regulator and the magnitude of the speed regulator’s output
relative to the torque reference.
• “SLAT Max” (4) – Drive operates in “Speed Limited Adjustable Torque –
Maximum select” mode. This is a special mode of operation used primarily
in web handling applications. The drive typically operates as a torque
regulator, provided that the P4 [Commanded Trq] value is algebraically
larger in value than the speed regulator’s output. The drive can
automatically enter Speed Regulation mode, based on conditions within
the speed regulator and the magnitude of the speed regulator’s output
relative to the torque reference.
• “Sum” (5) – Drive operates as a speed regulator. P685 [Selected Trq Ref ]
comes from P660 [SReg Output] plus torque adders summed with P4
[Commanded Trq].
• “Profilier” (6) PowerFlex 755 – Drive uses the Speed Profiler / Position
Indexer function. The drive operates as either a speed or position regulator.
Mode of operation depends on the configuration of the Step Types in the
Profiler/Indexer table.
• “Psn PTP” (7) – Drive operates as a position regulator. P685 [Selected Trq
Ref ] has the same source as in Sum mode. The position control is active in
Point-to-Point mode and uses its Point-to-Point position reference.