Specifications

Doc Number: VIS-ANA-VER-01001-9002
Date: 27 May 2004
Issue: 5.0
Page: 8 of 80
Author: J. Delgadillo
Controls Preliminary Design Report Issue 5.doc
4 Design Report
4.1 Scope
This design report will summarise the design features of all of the sub-assemblies that
comprise the Vista MCS in enough detail to demonstrate compliance with the technical
specifications, AD01.
4.2 Design Description
The following Vista Cable Diagram, Figure 4.2.A, VPO drawing number VIS-DWG-VER-
01001-9004, shows the equipment that comprises the VISTA Mount Control System. It
denotes what is to be provided by VertexRSI Controls Division, VertexRSI Structures
Division and what is provided by CFE (VPO or others). The major sub-assemblies of the
MCS are:
AZ/ALT Power Drive Unit (AZ/ALT PDU)
CASS Power Drive Unit (CASS PDU)
Regeneration Cabinet
Isolation Transformer
Data Acquisition System
Optical Incremental Tape Encoders
AZ, ALT and CASS Drive Motors and Brakes
Interlock Switches (Travel Limits, Stow switches, Emergency Stops, etc)
Mount Control Unit (MCU)
Portable Maintenance Unit (PMU)
The equipment will be located in the following areas:
Equipment Room
AZ/ALT PDU, CASS PDU, Regeneration Cabinet, Isolation Transformer
MCU and Emergency Stop Panel – These units, along with the AZ, ALT and
CASS LCUs will reside in the VertexRSI provided standard 19” equipment
rack (AD01 7.6, 11.1.1 spec)
Inside Yoke Arm
Data Acquisition Unit
M1 Mirror Support LCU
Pedestal Mount
Remaining equipment
The MCU and the PMU are not part of the system being delivered to meet the requirements
of AD01 and AD02, and thus can be considered as test equipment. For this reason the units’
descriptions have been placed in Appendixes.