Mission Critical Systems, Operations

Introduction

This document lists all the mission critical systems of Operations.

Scope

Only items that are maintained by the Operations Group are included in this document.

Equipment

Item	Purpose	Reason	Location	Status
Tercery mirror	collecting light	no spare	WHT	a silver coated new Tercery being investigated (HARPS)
Aluminising plant control electronics	Aluminizing mirrors	failure could prevent cleaned, unique mirror from being aluminized	WHT	no spare controls; repair will be required on component level
AZ motor; EL motor	drive system	spare motor damaged	WHT	planned to investigate; repair & test
Flip ring motor	Turning flip ring	no spare	WHT	no spare
Decon lubrication unit	Lubricating WHT telescope gears	no spare	WHT	Michiel is evaluating spare unit
Hydraulic gear flow dividers	delivering constant flow to support pads	no spare	WHT	Michiel is evaluating spare
Marconi power amplifiers; 2 used for AZ; 2 for Elevation	drive system	special built amplifiers by Marconi for WHT	WHT	1 spare only for 4 in use
Clip center interconnection area	Telescope cables ending on tag-strips or connectors all specially wired for the WHT	Lack of documentation; changes made in past not updated. Difficult fault finding.	WHT	requires revision, mayor job
Alarms and interlocks crate	Center where all the position-, limit- and emergency- switches and indicators are wire in	Custom made for the WHT by RGO.	WHT	no spare rack; built using wire wrapping technique
Marconi servo control rack	Custom build by Marconi	Custom build by Marconi. Difficult fault finding.	WHT	no spare rack
Focus motor	focus drive	no spare	WHT	no spare

References

This document is only valid on the day it was printed.
The source of the document can be found at :

http://www.ing.iac.es/~eng/spares/Ops_Critical_Systems.htm

Version number	Revision date	Previous revision date	Summary of changes	Changes marked
1.00	30 Apr 08	N/A	Document reviewed and released	JR

This document requires the following approvals.