Parker AC30 series, Manual

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Parameter Reference
C-41
AC30 series Variable Speed Drive
Parameter Name No. Path Default Range Units Writable
Actual Control Type
1886
Monitor::Motor and Drive
Parameters::Control Mode::Control
Mode
Same as PNO 1533
NEVER
Only visible for PMAC motor if Encoder Feedback control type selected.Default: Equals to Control Type
While the sequence is running, gives the drive actual control type.
Start Align Done
1887
Same as PNO 1886
NEVER
Only available for PMAC motor if Encoder Feedback control type selected.
Only appears if Startup Alignment set to ONCE.
Set to TRUE when the method has been run successfully.
Reset to FALSE after a cold start and/or a trip condition.
Functional Description
The motor selection is the first step in setting the control mode.
The selection of control strategy comes next, with the permitted settings as follows:
- Induction motors can be run in either volts hertz mode or vector mode
- Permanent magnet motors can only be run in vector control mode
If vector control is selected, and an encoder option or a resolver option is fitted, it is then necessary to choose whether to select vector control with
encoder feedback for improved performance.
Pseudo PMAC control
To make the PMAC control compatible with incremental encoder type ( pulse encoder, sin-cos, etc) which does not give absolute position information,
a Virtual Zero Position needs to be determined, creating a position offset which changes the incremental encoder position to an absolute encoder
position. After either a drive OFF or a trip condition situation, this offset is no longer valid and should be extracted again.
The method to align the encoder to the motor back EMF uses the AC30V Sensorless Vector Control motor scheme to start the motor ( the meaning of
‘to align’ is determine the Virtual Zero Position ). The absolute motor position is estimated by the sensorless control when the motor is turning. At least,
reaching a motor speed of 5% is needed to have a good estimation of the absolute position. ( 5% is the default and recommended threshold value to
move from a VHz motor control to a sensorless closed loop control mode in the actual AC30V sensorless Vector Control mode )