Astrel Instruments AST-8300-A Manuale Automanuale - Pagina 12
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AST-8300-A
PID control coefficients adjustment should by performed empirically, using the specific
equipment and with full load. The idea of the adjustment is to find coefficients that don't
lead to 'under-guiding' (corrections are too slow) or 'over-guiding' (sinusoidal oscillations
with increasing amplitude).
It is recommended to choose the range of values from 10 to slightly more than the
recommended value during the selection of the proportional coefficient (see 'Info' block)
and move through this region with the step of 10, looking attentively, how the result of the
guiding will change.
The selection of the integral coefficient is recommended to perform, if there is constant
impact in one direction. This coefficient will allow for the faster correction of the impact,
because it takes into account the previous guiding history.
The differential coefficient, as has been said above, is disabled at the moment.
!!! WARNING !!!
You should bear in mind during the selection of the coefficients, that their values may vary
for different axes.
If the polar axis is well aligned, then the guiding alond the DEC axis can be performed
more rarely, every 2-4 frames. This will allow to avoid excessive activity along the axis and
unnecessary vibrations. In addition, it is recommended to induce small imbalance
(overweight) against the diurnal motion for the RA axis in order to move with constant
tension and remove the play. It is recommended to induce a small shift of the polar axis
( for details see the drift method) from the ideal position for the DEC axis in order to make
a constant shift in one side and the guiding go in only one direction. This will allow to
reduce turbulence in the region of 0.
The value of 'Maximum pulse' is usually chosen more or less equal to the period of the
working cycle (time between two successive camera data captures). Usually there is no
Autoguider Manual
12/14
rev A