Allen-Bradley ControlLogix Reference Manual

Chapter 4
CIP Axis Attributes
200 Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
This algorithm applies a current to the motor stator to orient the rotor to establish
the motor commutation phasing.
Commutation Polarity
Usage Access Data
Type
Default Min Max Semantics of Values
Optional - CE
(PM)
Set/
SSV*
USINT 0 - - Enumeration
0 = Normal
1 = Inverted
2...255 = Reserved
# Indicates the attribute cannot be set while the tracking command (Tracking Command bit in CIP Axis Status is true).
When a PM motor is using UVW signals for commutation start up, it is critical
that the UVW phases of the commutation device follow the phasing of the motor.
Normal polarity implies UVW phasing according to factory specification when
the commutation device is moving in the factory defined positive direction.
Inverted polarity effectively switches the UVW phasing to UWV thus reversing
the directional sense of the commutation device. If it is determined through a
Commutation Test that the phasing of the motor and the phasing of the
commutation device have opposite polarity, this attribute can be used to
compensate for the mismatch.
Commutation Offset Compensation
Usage Access Data
Type
Default Min Max Semantics of Values
Optional - CE
(IPM Only)
SSV#/
GSV
REAL 0 0
Electrical Degrees
# Indicates the attribute cannot be set while the tracking command (Tracking Command bit in CIP Axis Status is true).
This value specifies the change in the Commutation Offset value in units of
electrical degrees as a linear function of current. When the Iq current is +100% of
rated continuous current, the Commutation Offset value is decreased by the value
of this attribute. When the Iq current is -100% the Commutation Offset is
increased by the value of the attribute. This attribute is used by the drive to
compensate for changes in the optimal Commutation Offset angle that can occur
as a function of motor current.
Commutation Alignment
The Default Commutation Alignment value used for the Feedback Commutation
Aligned and Commutation Alignment attributes depends on the associated
Feedback Type and whether or not the motor commutation device is Factory
Aligned. When the Motor Data Source is from Datasheet, it is assumed that the
motor is not Factory Aligned. When the Motor Data Source is from Database,
motor data in the database indicates if the motor is Factory Aligned.

Allen-Bradley ControlLogix Specifications

General

Brand	Allen-Bradley
Model	ControlLogix
Category	Industrial Electrical
Language	English