Motorola 900 series - BASE AND CROWN; Base; Base Unit Power System

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Base

BASE AND CROWN

A single CPU

Module

SCSI Device Expansion

Module

becomes a complete

enclosure

with

the

addition

of a

base

and

crown. This

chapter

describes the

functions of these

two

components.

The

base

module

provides

several functions. Physically, the

base

wider

than

the stack for stability

and

appearance; additionally,

lifts

the

chassis

out

of the

dusty

air

near

the

floor

and

protects

the

cooling

vents

from

blockage. The

base

provides

space for

two

electronic

modules,

the VME

terminator

and

the

Base

Unit

Power

System.

The

base

latches to

the

bottom

chassis

with

the

same

mechanism

that

interconnects

the

modules.

The

footprint

the

base

is larger

than

the

stack

meet

safety

requirements

for stability

and

prevent

installing

the

stack too

close to

another

system

structure

and

completely blocking its air flow.

The

base

has

molded

strain

relief for

the

main

power

cord

that

prevents

accidental

pull

out,

but

allows a

loop

that

is large

enough

meet

regulatory

safety

requirements

for a

main

power

disconnect point. A

post-plated

sheet

metal

panel

covers

the

bottom

of the

base

for shielding

and

safety

considerations. The

metal

panel

latches into place to

ensure

safety

requirements

of restricting

operator

access. The

base

always

required

order

meet

regulatory

and

transient

suppression

requirements.

The

VME

terminator

latches

into

place

from

the

top

the

base.

The

VME

terminator

directly interconnects

with

the

base

power

unit

the base.

Base

Unit

Power System

The

Base

Unit

Power

System

board

is installed

from

the

bottom

of the base.

is covered

the

metal panel. A single

screw

and

integral latches

hold

place.

The

base

power

system

locates

one

place several functions

that

would

otherwise

repeated

the

100

and

190

watt

power

supplies.

provides

the

enclosure control

board

with

housekeeping

voltage deleting

expensive

and

umeliable

bi-stable relay.

S900RF/D4

5-1

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Motorola 900 series - BASE AND CROWN; Base; Base Unit Power System

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