Parker AC30 Série Mode D'emploi page 419

Pos Fbk Alignment
Parameters::Motor Control::Pos Fbk Alignment
Only available if PMAC MOTOR selected in Control Mode and Control Type set to ENCODER FEEDBACK .
Vector Control of a PMAC motor needs to know the relative position between the rotor and the stator.
By definition, the AC30 Vector Control for a PMAC Motor is based on the assumption that the motor back EMF is crossing the 0V line in a positive
direction when the electrical position is also crossing the 0° line in a positive way. Another requirement is to insure a positive 'encoder/resolver'
rotation with a positive electrical motor rotation ( U, V, W ).
This feature is used to automatically calculate any offset between the encoder absolute position and the motor back EMF, as well as selecting the
correct wiring of the motor ( U, V, W sequence ) with the encoder position.
The feature needs to be run at least once with a PMAC motor associated to an absolute encoder type.
The feature needs to be run after each power cycle with a PMAC motor associated to a relative encoder type ( pulse encoder for example )
The feature is run on a motor free to rotate, no load attached to the motor shaft.
Regardless of the Alignment Method selected, the motor should move during the sequence.
If Alignment Method is set to AUTOMATIC, it is possible that the direction of motor rotation for a positive setpoint could be reversed. The
parameter 1809 PMAC Wiring can be changed and overwritten by the sequence if an incompatibility of direction between the encoder and
the motor phases wiring is found.
Parameter Name No.
Alignment Enable 1798
Enable the Alignment sequence.
Alignment On Power On 1796
AC30 series Variable Speed Drive
Path
Setup::Motor Control::Pos Fbk
Alignment
Parameters::Motor Control::Pos
Fbk Alignment
Setup::Motor Control::Pos Fbk
Alignment
Parameters::Motor Control::Pos
Fbk Alignment
Parameter Reference
Default Range
FALSE
FALSE
D-133
Units Writable
STOPPED
STOPPED