Specifications

Doc Number: VIS-ANA-VER-01001-9002
Date: 27 May 2004
Issue: 5.0
Page: 59 of 80
Author: J. Delgadillo
Controls Preliminary Design Report Issue 5.doc
4.2.6 Material Parts
All fastening hardware utilized on the Mount Control Systems sub-assemblies will be metric.
As agreed, modification of off-the-shelf assemblies or line-replaceable unit subcomponents to
metric hardware will not be done. However, most sub-assemblies are already provided as
metric units such as the Motor Controller Power Supplies, Motor Controllers, Encoder
Interpolator and Splitter boxes, among others. For the sub-assembly hardware that will not
be metric, it will be at least serviceable with a Phillips or flat blade screwdriver.
As previously discussed, chassis, covers, rear-panels, front panels, etc. used for the Mount
Control System sub-assemblies, will not be made of metric steel.
4.2.7 Documentation
VertexRSI drawing number 93-100-2877 (VPO dwg no. VIS-DWG-VER-01001-9000),
VISTA MCS Top Level Drawing, shows the list of deliverables for the mount control system.
The parts list of this document shows the part numbers (VertexRSI as well as VPO part
numbers) for the sub-assemblies that comprise the mount control system. This top level
drawing also shows the configuration of the MCU and CCU Interface boards, the Status
Board and the Control Board. The configuration is the component and circuit changes made
to the baseline boards. In this manner, VertexRSI can build ahead baseline boards and then
the board can be configured, per the Top Level drawing, to meet the program’s specific
requirements.
An Indentured Drawing List drawing, 99-343-0009, (VPO drawing no. VIS-DWG-VER-
01001-9009) shows the list of deliverable drawings. A section of the O&M Manual gives a
cross-reference between the VertexRSI and the VPO drawings.
4.2.8 Break-out Boxes
Seven break-out boxes will be provided per the requirements of AD07. The break-out boxes
are not provided for all connectors. If connection between Unit A and Unit B has different
types of connectors, a break-out box is only provided to connect to Box A, since there’s no
need to provide a break-out box for Box B.
For obvious safety reasons, break-out boxes are not provided for power (AC) or high voltage
(AC or DC) connectors since the AD07 spec for the break-out boxes is implicitly for control
signals. Additionally, two-wire circuits are not supplied with break-out boxes, as debug is
simple, thus not requiring a break-out box.