Parker AC890PX Series, Product Manual

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D-41
Programming
AC890PX AC Drive
Parameter Descriptions
CAL FAIL RETRY
PREF: 71.24 Default: FALSE Range: FALSE / TRUE
The software will make a number of attempts to calibrate the absolute position (see CALIBRATN STATUS above) and then
go into the CALIBRATN FAILED state. If the problem has been corrected, it is necessary to get it to try again. This can be
done either by switching the drive on and off, changing a related parameter, or by setting CAL FAIL RETRY = TRUE. When
the calibration is done, it will automatically be reset to FALSE.
LINE COUNT X4
PREF: 71.31 Default: 0 Range: _
Diagnostic showing the encoder line count times 4, i.e. each edge is counted. This diagnostic is set to 0 at power-up and reset
when RESET LINE COUNT is TRUE.
RESET LINE COUNT
PREF: 71.23 Default: FALSE Range: FALSE / TRUE
If TRUE the LINE COUNT X4 diagnostic is reset.
Functional Description
A quadrature encoder uses 2 input signals (A and B), phase shifted by a quarter of a cycle (90

). Direction is obtained by
looking at the combined state of A and B.
A
B
Speed is calculated using the following function:
where counts per second are the number of edges received from the encoder. There are 4 counts per line.