The VST tracking system and its preliminary performance
2008
The 2.6m VST telescope is in installation phase in the ESO observatory of Cerro Paranal. After preliminary tests in
Europe performed jointly by INAF and ESO the tracking system was considered at the readiness level to be shipped to
Chile. The motion control system has already been reintegrated in Chile and is operational again. The final tuning is
going to be performed after the integration of all the telescope subsystems, still in progress. Therefore here the focus is
especially on tests performed in Italy. This paper describes the solutions adopted for the telescope main axes control as
well as the preliminary tracking results. Available test data are related to encoder feedback. Tests have been performed
tracking coordinates of virtual objects. A comprehensive test case to evaluate the performance of different controllers
was needed to proceed in a systematic way. A tracking map derived from the VLT commissioning experience has been
used, spanning all the different conditions for axes positions and speeds, including meridian crossing and tracking near
the blind spot.
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