Dome functioning and tire

General functioning

The dome is motorized in azimuth. The drive system consists of a Solex tire running on a circular bearing surface.
To automate dome rotation, we installed an incremental encoder and a zero-position sensor, allowing us to determine the absolute angular position of the dome.

A control unit from Sheylak Instruments is used to read the encoder signals and operate the dome-rotation relays.
A dedicated electrical control box was designed to ensure proper isolation between the low-voltage control electronics and the high-current actuation components.

The Sheylak interface is connected to the control computer via a serial link. Once the system is initialized, we can calibrate the dome position and synchronize its motion with the telescope’s pointing.

The upper structure (“Cimier”) has two different operating modes depending on whether observations are made toward the horizon or the zenith. In both modes, the lower section of the Cimier must be manually engaged or disengaged. This procedure cannot be automated.

Tire 

The dome’s azimuth motion is transmitted by a Solex tire that presses against the dome’s bearing track.
The tire is located as shown in the picture below. 

Proper tire pressure is essential for stable traction, smooth rotation, and consistent encoder readings. The recommended pressure for the Solex drive tire is 3 bar.

To inflate the tire, use the air pump located on the floor directly beneath the tire

To use the pump, first release the side lock and connect the hose to the tire valve. Insert the connector onto the valve stem and press down the lever to secure it.
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Operate the pump with your foot until the pressure gauge reads slightly above 3 bar.
Once inflated, release the lever and detach the hose. Well done!