Enclosure and Anemometers

• The telescope enclosure sub-system consists of the 2 half-shells of the enclosure slit, the associated seals, the six (6) clamping actuators and 2 telescope anemometers 3D, located on top of the enclosure and mounted 45 degrees apart the local vertical. This configuration allows proper computation of the wind speed and direction independently of the opening angle of the enclosure shells.
  The slit open/close motion is performed to close the enclosure of the telescope during day-time and so to be able to protect the equipment and control the temperature inside the telescope in the building. When the wind speed, measured on the local anemometers, exceeds 18 m/s, the opening of the slit is not allowed; if the slit is open, it is automatically closed if possible.
  The Remote control of the enclosure sub-system is only possible when the corresponding button of the enclosure control panel is in REMOTE position.
  All signals described in the table below are mapped into the PLC and are accessible via status commands.
  
• The control is deployed on the Auxiliary LCU.
• The Enclosure is controlled by a Siemens PLC, connected to a RS232 Serial Port via Connector W42.
• The 2 anemometers 3D are connected to the Siemens PLC. Their monitoring is performed via the Serial link.

Enclosure interfaces:

Item	From	To	Signal	Description
COMMUNICATION:
1			Enclosure and Anemometer Communication	RS232 Port to Siemens PLC Protocol RK512/3964R

Item	From	To	Signal	Description
SEALS STATUS:
10	ATS	LCU	Enclosure seals inflated + shells clamped status	Bit set if shells clamped and seals fully inflated PLC Digital Input
11	ATS	LCU	Enclosure seals deflated + shells unclamped status	Bit set if seals fully deflated and shells unclamped PLC Digital Input
GLOBAL STATUS:
20	ATS	LCU	Enclosure closing automatically	contact closed if Enclosure is closing automatically PLC Digital Input
21	ATS	LCU	Enclosure local status	contact closed if Enclosure is in local control PLC Digital Input
ANEMOMETER MONITOR:
30	ATS	LCU	Anemometer #1 wind speed in X ,Y,Z	Software command to W42 X,Y,Z coded over 8 Bits in m/s Note: directions are related to the Anemometer, hence relative to the opening of the Enclosure shells.
32	ATS	LCU	Anemometer #2 wind speed in X,Y,Z

Item	From	To	Signal	Description
ENCLOSURE CONTROL:
100	LCU	ATS	Enclosure front shell open command	asserted to open the enclosure front shell at the next start command. negate to close at the next start command.
101	LCU	ATS	Enclosure rear shell open command	asserted to open the enclosure rear shell at the next start command. negate to close at the next start command.
102	LCU	ATS	Enclosure front shell start command	assert to initiate the opening/closing of the front shell. Negate to stop the motion whenever the desired postion is reached.
103	LCU	ATS	Enclosure rear shell start command	assert to initiate the opening/closing of the rear shell. Negate to stop the motion whenever the desired postion is reached.
104	ATS	LCU	Enclosure front shell actuator#1	Software command to W42 Actuator position coded over 8 Bits Scaling t.b.d.
105	ATS	LCU	Enclosure front shell actuator#2
106	ATS	LCU	Enclosure rear shell actuator#3
107	ATS	LCU	Enclosure rear shell actuator#4

Last modified: Mon 20-Jan-2003 11:00