198 Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
If this attribute is not supported in the implementation, it is recommended that
the drive establish induction motor flux using alternative means prior to
transitioning to the Running state.
Flux Up Time
Usage Access Data
Type
Default Min Max Semantics of Values
Optional - D
(IM)
Set/SSV REAL 0 0 10
3
Seconds
The Flux Up Time attribute sets the amount of time the drive device allows to
build full motor flux before transitioning to the Running state.
Feedback Commutation Aligned
Usage Access Data
Type
Default Min Max Semantics of Values
Optional - CE
(PM)
Set/GSV USINT 0
DB
- - Enumeration
0 = Not Aligned (R)
1 = Controller Offset (R)
2 = Motor Offset (O)
3 = Self-Sense (O)
4 = Database Offset (O)
5...255 = Reserved
This enumerated parameter is set to Controller Offset (1) when the motor
mounted absolute feedback device is to be aligned with the stator windings of the
PM motor according to the Commutation Offset value. In some cases the
Commutation Offset can be preset to a value established by factory alignment of
the motor feedback device relative to the motor stator windings.
A setting of Not Aligned (0) indicates that the motor is not aligned, and that the
Commutation Offset value is not valid. If the Commutation Offset is not valid, it
cannot be used by the drive to determine the commutation angle. Any attempt to
enable the drive with an invalid commutation angle will result in a Start Inhibit
condition.
Alignment can be achieved using a Commutation Test that measures and sets the
Commutation Offset for the motor or by direct user entry. If this attribute is set to
Motor Offset (2) the drive derives the commutation offset directly from the
motor. If set to Self-Sense (3) the drive automatically measures the commutation
offset when it transitions to the Starting state for the first time after a power cycle.
This generally applies to a PM motor equipped with a simple incremental
feedback device.
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