Interface Definition

Deployment of sub-systems on the LCUs

Introduction

The interfaces between the Control Software of the ATS and the Electro-Mechanical Hardware are implemented at LCU level.

Typically one LCU is fully responsible for one or more sub-systems.

The Auxiliary Telescopes control system is distributed over 1 Workstation and 4 separate Local Control Units;
It is responsible for the control of 13 main and 5 auxiliary electro-mechanical functions, and 2 detectors.

• Altitude LCU
• Altitude drive
• M2 drives
• Pupil beacon
• Nasmyth wheel
• Temperature Sensors
• Azimuth LCU
• Azimuth drive
• M10 (to be replaced by Dual Feed Mirror M10DFM)
• Coudé Beam Switching Device
• Azimuth cable wrap
• M10 Dual Feed Mirror
• Transversal Atmospheric Dispersion Compensator
• Sensor LCU
• Field Acquisition System (FAS)
• Field Stabilization System (FSS)
• M6 (to be replaced by Deformable Mirror M6DM)
• FSS Filter Wheel
• FSS Aperture Field Diaphragm
• FSS Translation Stage
• M6 Deformable Mirror
• Auxiliary LCU
• Enclosure
• Air Conditioning
• Relay Optics Structure (ROS) Shutter
• Transporter
• Service modules:
• Auxiliary Power
• Hydraulic and Pneumatic systems
• Liquid Cooling Module

Each individual LCU is contained in an electronic cabinet and has a mechanical and an electronic interface. The mechanical interface is the location and fixation on the transporter. The electrical interface are the commands and monitoring signal lines necessary for the operation of the entire system under control of the central control workstation.

The contractor is responsible for the low level specification (encoder resolution, friction, etc.) which are necessary to meet the performance requirements as defined in the Technical Specifications. Even though the final position control of these elements is under ESO responsibility, the contractor shall verify performance requirements using his own verification control electronics, except for the azimuth and altitude loops.

Conventions

All Terminal Blocks and connectors referenced in this document have been labelled as described below:
 

The signals are described as seen from the LCU.

The terminal blocks Yn and DB9 connectors Wn have been indexed following the product tree numbering implemented in [RD 08]:
 

The LCU console connectors are indexed Wn0.

General requirements

These interfaces shall be compliant with the Electronic Design Specifications [AD 01] and the Electro-Magnetic Compatibility Specifications [AD 02].

These interfaces shall be identical for every AT unit.

The control racks shall be provided by the contractor (according to [AD 01]) and shall contain not only the power and drive electronics of the contractor but provide also the space for the ESO-LCUs.

All 4 LCUs are connected to station plugs for the power, the time bus, the control LAN and the Guide / Acquisition LAN.

All LCUs and other equipment supplied by ESO shall be powered by 230V via the battery system supplied by the contractor as shown in the following figure:

Power distribution schematics

The electrical power of all this equipment is specified in the ATS technical specifications.

LCU will be connected to UPS main power supply via circuit breakers and intermediate terminal blocks up to distribution bars generically named Z0 on the drawing.

Station Plug

The connection layout and pin assignment is given in Annex [AN1] AT Station Pit/Connection box VLT-SCH-ESO-15154-2202
 

Overview Schematic:

Last modified: Mon 14-May-2001 10:27