Control Data BR3B8 User manual

CONTROL

DATA

(

()

fi'

PUR

A T

ION

CONTROL

DATA~

8RJ88

DISk

STORAG£ UNIT

R£F£R£NC£ MANUAL

CONTROL

DATA

--~-~~-

j,.

1"..... "

CONTROL

DATA®

BR:JB8

DISK

STORAGE

UNIT

REfERENCE

MANUALI

REVISION

RECORD

REVISION

DESCRIPTION

Manual

released.

(9-13-73)

Technical

and

editorial

changes.

(4-12-74)

Update

manual

with

Engineering

Change

Orders

PE35350A,

PE35634A.

Technical

and

(4-7-75)

editorial

changes.

Changes

affect

pages

1-3, 1-4,

3-1

3-3

3-6

thru

3-9,

3-12,

3-l3.,

3-16,

3-18

thru

3-20,

3-44,

3-45,

3-47.

Technical

and

editorial

changes.

Changes

affect

pl:l:ges

3-78,

3-79/3-80.

(7-25-75)

Publication

No.

83301100

1973,

1974,

1975

Control

Data

Corporation

Printed

the

United

States

America

Address

comments

concerning

this

manual

to:

Control

Data

corporation

I-~·

Technical

Publications

r:epart:nent~'

7801

Catputer

Avenue

Minneapolis

55435

use

Comment

Sheet

the

back

this

manual.

83301100

PREFACE

This

manual

has

been

prepared

for

customer

engineers

and

other

technical

personnel

directly

involved

with

maintaining

the

disk

storage

unit

(drive).

Reference

information

provided

three

sections

this

manual.

Section

numbers

and

brief

de-

scription

their

contents

are

listed

below:

Section

1 -

General

Description.

Describes

equip-

ment

functions,

specifications,

and

equipment

number

identification.

Section

2 -

Operation.

Describes

and

illustrates

the

location

and

use

all

controls

and

indicators,

power

sequencing,

and

disk

pack

installation

and

removal.

83301100 A

Section

indicators,

power

sequencing,

and

disk

pack

installation

and

removal.

Theory

Operation.

Describes

basic

logic

and

mechanical

functions.

Manuals

applicable

the

BR3B8

Disk

Storage

Unit

are

follows:

Publication

No.

83301000

83301100

83301200

70629100

Title

Maintenance

Reference

Parts

Data

Logic

Cards

GENERAL

DESCRIPTION

Introduction

Assembly

Locations

Top

Cover

Assembly

Deck

Assembly

Power

Supply

Logic

Chassis

Equipment

Identification

OPERATION

Controls

and

Indicators

Operating

Instructions

Power

Application

Disk

Pack

Handling

Disk

Pack

Installation

Disk

Pack

Removal

THEORY

OF'

OPERATION

Introduction

Assemblies

Power

Supply

IDC

Distribution

Overtemperature

Monitoring

Power

Sequence

Emergency

Retract

and

Data

Protection

Loss

Power

Control

Interlock

Opening

Loss

Speed

Loss

Power

Off

Sequence

Logic

Chassis

Deck

Assembly

Drive

Motor

Assembly

Hysteresis

Brake

Assembly

Spindle

Assembly

Actuator

Transducers

Disk

Cleaner

Assembly

83301100 A

CONTENTS

Blower

System

Disk

Pack

1-1

1-3

1-4

Logic

Functions

2-1

2-4

2-5

3-1

3-6

3-7

3-8

3-9

3-10

3-12

3-14

3-18

Basic

Interface

Description

Unit

Selection

Seek

Operations

Servo

Circuit

Basic

Seek

Operation

Short

Seeks

Track

Servo

Circuit

Basic

Description

Circuit

Description

End

Travel

Detection

Cylinder

Pulse

Generation

First

Seek

Direct

(Forward/Reverse)

Seek

1/0

Sequencing

Positioner

Motion

Return

Zero

Seek

(RTZS)

Machine

Clock

Circuit

Clock

Generation

Index

Error

Detection

Sector

Circuit

Basic

Read/Write

Principles

Introduction

Writing

Data

Reading

Data

Track

Format

Principles

MFM

Recording

Read/Write

Operations

Introduction

Head

Selection

Write

Data

Processing

Read

Data

Processing

3-19

3-20

3-29

3-30

3-34

3-37

3-39.

3-42

3-43

3-44

3-48

3-52

3-53

3-55

3-57

3-58

3-60

3-62

3-63

3-65

3-70

FIGURES

Figure

Page

Figure

Page

1-1

Assembly

Locations

1-3

3-24

First

Seek

Flow

Chart

3-45

2-1

Controls

and

Indicators

2-1

3-25

First

Seek

Timing

Diagram

3-47

3-1

Simplified

Logic

Symbology

3-2

3-26

Direct

Seek

Flow

Chart

3-49

3-2

Power

Distribution

3-3

3-27

Direct

Seek

Timing

Diagram

3-51

3-3

Power

Sequencing

3-4

3-28

TZS

Flow

Chart

3-54

3-4

Power

Interlocks

3-5

3-29

Machine

Clock

Circuit

3-5

Power

Off

Timing

3-8

3-30

Index

Detection

Circuit

3-57

3-6

Power

Off

Sequence

3-11

3-31

Sector

Circuit

3-58

3-7

Deck

Assembly

3-13

3-32

Sector

Circuit

Timing

Diagram

3-59

3-8

Spindle

Assembly

3-14 3-33

Writing

Data

3-61

3-9

Actuator

Assembly

Elements

3-15 3-34

Reading

Data

3-61

3-10

Head

3-16

3-35

MFM

Recording

3-62

3-11

Head/Arm

Assembly

Motion

3-17

3-36

Read/Write

Chain

Block

Diagram

3-63

3-12

Speed

Detection

3-18

3-37

Head

Sector

and

Write

Circuits

3-64

3-13

Velocity

Detection

3-19 3-38

Write

Data

Serializer

3-66

3-14

Blower

System

3-20

3-39

Write

Serializer

Timing

3-67

3-15

Logic

Block

Diagram

3-21

3-40

Write

Irregularity

3-68

3-16

Function

Control

Timing

3-27

3-41

Peak

Shift

3-69

3-17

Status

Request

Timing

3-29

3-42

Write

Compensation

Circuit

3-71

3-18

Servo

Circuit

Simplified

Schematic

3-33

3-43

AGC

Amplifier

Stage

(Simplified

3-19

Servo

Circuit

Simplified

Signals

3-35

Logic)

3-72

3-20

Track

Servo

Disk

Layout

3-38 3-44

Data

Latch

Circuit

3-73

3-21

Track

Servo

Circuit

Simplified

3-45

Phase

Lock

Oscillator

Circuit

3-75

Schematic

3-40

3-46

Data

Separator

Circuit

3-76

3-22

Track

Servo

Circuit

Simplified

3-47

Read

Data

Serializer

3-78

Signals

3-41 3-48

Deserializer

Timing

3-79

3-23

Cylinder

Pulses

Generation

3-43

TABLES

Table

Page

Table

Page

1-1

Drive

Specifications

1-1

3-2

Function

Control

Code

Definitions

3-23

2-1

Controls

and

Indicators

2-2

3-3

Operational

Status

Byte

Definitions

3-28

3-1

I/O

Lines

3-22

3-4

Servo

Circuit

Functions

3-30

83301100 A

SECTION 1

GENERAL DESCRIPTION

INTRODUCTION

The

CONTROL

DATA®

BR3B8

Disk

Storage

Unit

high

speed,

random

access,

disk

storage

device.

The

drive

available

both

single

and

dual

channel

configurations.

Unless

otherwise

specified,

data

this

manual

applies

either

configuration.

Characteristic

Size

Weight

Temperature

Relative

Humidity

(no

condensation)

Altitude

Power

Input

83301100

Equipment

specifications

are

listed

Table

1-1.

TABLE

1-1.

DRIVE

SPECIFICATIONS

Conditions

Specifications

PHYSICAL

SPECIFICATIONS

Height

Width

Depth

Operating

Gradient

Non-Operating

Operating

Non-Operating

Operating

Non-Operating

39.5

in.

(100

cm)

in.

(56

cm)

44.5

in.

(176

cm)

700

lbs

(318

kg)

(15.

SOC)

gOOF (320C)

120F

(6.

per

hour

-30

(-34

0C)

+150

(66

200/0

800/0

95%

-1000

(-305

+10,000

(3.05

km)

mean

sea

level

-1000

+35,000

(10.7

km)

POWER

SPECIFICA

TIO:\'S

(Typical

Values)

Refer

Pub.

No.

83301000

for

additional

power

information.

Definitions:

Standby

State:

power

on,

spindle

motor

off.

AcceSSing

State:

pOSitioner

continually

random

seeking.

BR3B8A/C

BR3B8B/D

Phasing

(60

Hz)

208v

(±10o/a)

(±O. 6)

Hz,

3rt>

380v

(±10o/a)

(±0.5)

Hz,

3rt>

Two

phases

supplied

from

three-phase

delta

source

are

used

per

drive.

Three-phase

power

available

AITB1

power

cable.

During

installation,

two

phases

are

connected

internal

power

supply.

Phases

are

normally

rotated

from

drive-to-drive

externally

that

each

group

three

drives

present

balanced

three-phase

load.

Motors

are

single-phase

connected

phase-to-phase.

Phasing

(50

Hz)

One

phase

used

per

drive.

Three-

phase

power

available

AITB1

power

cable.

Power

connected

phase-to-neutral

with

phases

rotated

externally

from

drive-to-drive

present

balanced

three-phase

load.

1-1

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