TriPoint VertexRSI 7200, Operation And Maintenance Manual

Page: 20 / 266

O V ERVIE W
2 - 5
2.4 Syst e m H a r dw a r e
The 7 2 0 0 A C S cons i sts of the fo ll o w i ng subsystems:
Mode l 7 2 0 0 A C U
7 1 5 0 Dr i ve cab i net
Pos i t i on Feedback Dev i ces
The system i nterfaces w i th three-phase i nduct i on motors for A Z and EL pos i t i on i ng
and a s i ng l e-phase A C synchronous stepp i ng motors for POL rotat i on. L i m i t
i nterfaces are for norma ll y c l osed s w i tches that open upon engagement.
2.4.1 7200 ACU H a r dw a r e
The Mode l 7 2 0 0 A C U i s a techn i ca ll y advanced, spec i a ll y des i gned, mu l t i task i ng
embedded contro l computer that i nc l udes i nput and output c i rcu i try suff i c i ent for
i nterfac i ng w i th a ll other re l ated track i ng system components. The A C U hard w are i s
based upon the i ndustr i a l V ersa Modu l e Europe (V ME) bus arch i tecture, prov i d i ng
extreme versat ili ty and re li ab ili ty far above many other hard w are p l atforms. Severa l
pr i nted c i rcu i t cards and per i phera l subassemb li es, descr i bed i n subsequent
paragraphs, are i ntegrated i n a custom chass i s to compr i se the A C U. The pr i mary
components of the 7 2 0 0 A C U are:
Front Pane l D i sp l ay A ssemb l y Back Pane l PCB
A na l og Daughter PCB T w o Po w er Supp li es
Dua l Channe l RD C - PCB Computer Pr i nted-C i rcu i t Board (PCB)
Opt i ca l Encoder I/O PCB S i ng l e/Dua l -Speed PCB
Opt i ca l Encoder PCB Keyboard PCB
Input/Output (I/O) PCB
The 7 2 0 0 A C U front pane l i s sho w n i n F i gure 2-2. The 7 2 0 0 A C U funct i ona l b l ock
d i agram i s sho w n i n F i gure 2-3. F i gures 2-4 and 2-5 sho w the top and s i de v i e w of
the A C U respect i ve l y. (Refer to the eng i neer i ng dra w i ngs i n Sect i on 8.0)
F i gure 2-2 7 2 0 0 A ntenna Contro l Un i t Front Pane l