Control Data Corporation 5R2A5 User manual

CONTROL
DATA®
DISK
STORAGE
UNIT
5R2A5
6ENERAL
DESCRIPTION
OPERATION
INSTALLATION
AND
CHECKOUT
THEORY OF OPERATION
MAINTENANCE
CONTROL
DATA
C
OR P0 RATION
CUSTOMER
ENGINEERING MANUAL

REVISION
RECORD
REVISION
DESCRIPTION
01
Preliminary edition.
(3—1—71)
A
Manual released.
This
edition supercedes all
previous editions.
(7—28—71)
B Incorporates Engineering Change Orders
PE29151, PE29419, PE29440, and Technical Corrections
(9—17—71) affecting pages ii, iii, viii, 1—3, 2-4,
2—7, 2—8, 2—9,
3-2,
3—7, 3—8,
3—9,
4—12, 4—13, 4—22, 4—23,
4-24,
4—25,_4-26,_4-28,_4—30,_6-1,_6—2,_6—18,_6—19,_6-20,_6-21,_6—31,_6—32,_6—32.1,_6—41,
Comment Sheet.
C
Incorporates Engineering Change
Order
PE29476/Field Change Order PE29479 affecting pages
(10- 1-71)
Ii, iii, iv, 6-24, 6-29, 6-30, Comment
Sheet.
D Incorporates
Engineering/Field
Change
Order PE29504 affecting pages ii, Iii, iv,
6-30, 6-33,
6-34,
(12-17-7 1)
Comment
Sheet.
E
Incorporates
Field Change Order
PE29502
affecting pages II, Iii, iv,
6-7,
Comment Sheet.
(2—25-72)
F Incorporates
Technical Corrections
affecting
pages
II, lii, lv, vii, viii, Ix, 3-1, 6-3, 6-4,
6-5,
(4-13-72)
8-6, 6-7, 6-8, 6-9,
6-10, Comment
Sheet.
G
Incorporates Engineering
Change Order PE3
1156/Field
Change Order PE3ll57 and Technical
(9—7—72)
Corrections affecting
pages
ii, iii, iv, 6-5, 6—6, 6-25, 6—27.
H
Incorporates Engineering
Change
Order PE3
1283/Field
Change Order
PE3 1297
affecting pages
(12—21—72) ii, ill,
iv,
6—25, 6—27.
J
Incorporates Engineering Change Order PE3 1317 documenting
BR2A5A,
60 lIz
units and Technical
(2—2—73)
Corrections affecting
pages
ii, lii, iv, viii, ix, 1-3,
2-4, 2—5, 2-7,
3-3,
3-6, 4-26, 6-1,
6-2, 6-5,
6—15, 6—18, 6—19, 6—20, 6—21, 6-22, 6—23, 6—29, 6—30, 6-31, 6—32, 6—34, 6-37, 6-39,
6—42,
6-43,
6-44, 6-49.
Page
6-32.1
deleted.
K
Incorporates Engineering/Field
Change
Order
PE3
1594 and Technical Corrections affecting
pages
(3-10—74)
ii,
iii, iv, viii, 4—23, 4—24, 4—26, 6—24,
6—48,
6-48.1.
L
Technical
changes affecting
pages; ii. iii.
Iv.
6-50. 6-51.
6-53.
(8—16—74)
Publication No.
70614600
©
1971. 1972, 1973, 1974
by
Control
Data Corporation
Printed in the
United States of
America
Address comments concrning
this
manual
to:
Control
Data Corporation
Technical Publications Department
7801
Computer Avenue
Minneapolis,
MN
55435
or use
Comment Sheet In the
back of
this
manual.
0
11
70614600
L

C
PUBLICATION
NO.
PUBLICATION
TITLE
MANUAL
STATUS
CHECK
SHEET
70614600
Sheet
1
of
2
BR2A5
Disk
Storage
Unit Maintenance
REVISION
Manual
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111

PUBLICATION NO.
PUBLICATION TITLE
MANUAL
STATUS
CHECK
SHEET
70614600
Sheet
2
of
2
BR2A5
Disk
Storage
Unit
Maintenance
Manual
REVISION
L
PAGE
NUMBER REV
6-51
L
6-52
6-53
L
6-54
A
6-55
A
6-56
A
6-57
A
6-58
A
PAGE
NUMBER
REV
6-59
A
Sec7,8,
9,
10
-
Cmt
Sht
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Return
Env
-
BackCover
-
C
C
C
iv
70614600
L

PREFACE
Customer
engineering
material
for
the
CONTROL
DATA®
BR2A5 Disk Storage
Unit
is contained
in three separate manuals
and
provides
all information
needed to
install,
operate,
and
maintain the
unit:
Publication
No.
70614600 General
Description,
Operation, Installation
and Checkout, Theory
of Operation, Maintenance
Publication No.
70614700
Diagrams,
Maintenance
Aids,
Wire
Lists
Publication
No.
70614800
Illustrated
Parts
List
70614600
A

CONTENTS
1.
GENERAL DESCRIPTION
Introduction
1-1
Equipment
Specifications
1-2
2.
OPERATION
Controls
and
Indicators
Operating
Instructions
DSU
Power
Application
Disk
Pack
Installation
Disk
Pack
Removal
3.
INSTALLATION
AND
CHECKOUT
Uncrating
Space
Allocation
Leveling
and
Aligning
Cabling
and
Connections
Cabinet
Intracabling
Input/Output Cables
Power
Cables
Ground
Bond
Cabinet
Accessories
Input
Power
Requirements
Environment
Initial
Checkout and
Startup
Procedure
4.
THEORY OF
OPERATION
Functions
First
Seek
Direct
(Forward/Reverse)
Seek
Return
to
Zero
Seek
(RTZS)
Read/Write/Erase
Assemblies
Power
Supply
AC
/DC
Distribution
Power-On
Sequence
Power-Off
Sequence
Logic Chassis
Deck Assembly
Drive
Motor
Assembly
Hysteresis Brake
Assembly
Spindle
Assembly
Actuator
Transducers
Track
Servo
Disk
Cleaner
Assembly
Blower
System
Disk
Pack
6.
MAINTENANCE
Maintenance
Tools
Maintenance
Materials
Preventive
Maintenance
General
Preventive
Maintenance
Index
Inspect
Actuator Assembly
Clean
Front
Cover
Glass
Change
Primary
Filter
Check
Power
Supply
Outputs
Inspect
and
Clean
Read/Write
and
Servo
Heads
Clean
Shroud
and
Spindle
Clean
Pack
Cleaning
Brushes
Clean
and
Lubricate
Lockshaft
Replace
Absolute
Filter
2-1
2-8
2-8
2-9
2-10
3-1
3-2
3-2
3-2
3-2
3-4
3-6
3-6
3-6
3-6
3-7
3-7
4- 1
4-12
4-13
4-21
4-22
4-23
4-23
4-23
4-25
4-27
4-28
4-29
4-29
4-31
4-31
4-33
4-39
4-40
4-41
4-44
4-45
6-1
6-2
6-2
6-2
6-3
6-3
6—3
6-4
6-5
6-6
6-7
6-7
6-8
6-8
70614600
F
vii

C
Corrective
Maintenance
CDC
Pack
Cleaning
Procedure
Read/Write
and
Servo
Heads
Check
Head/Arm
Adjustment
Head/Arm
Removal
Replacement
Adjacent Track Erase
Check
Tuned Amplifier
Check
and
Adjustment
Drive Belt
Removal
and
Replacement
Drive
Motor Removal
and
Replacement
Drive
Motor
Pulley Removal
And
Replacement
Hysteresis
Brake
or
Felt
Removal
and
Replacement
Spindle Lock
Pawl
Check
Adjustment
Pack-On
Switch
Check
and
Adjustment
Removal
and
Replacement
Ground
Spring
Check
and
Adjustment
Spindle
and
Lockshaft Assembly
Lockshaft
Removal
and
Replacement
Spindle
and
Lockshaft
Assembly Removal
and
Replacement
Index
Sensor
Assembly
Sensor Stop
Check
and
Adjustment
Index to
Burst
Check
and
A
djustment
Index Transducer
Removal
and
Replacement
Transducer Output
Check
Shroud
Adjustment
Disk
Cleaner Assembly
Check
Adjustment
Removal
and
Replacement
Head
Select
Preamplifier
Card
Removal
and
Replacement
Heads
Loaded
Switch
Check
Removal and
Replacement
Velocity Transducer
Check
Removal
and
Replacement
Carriage
Alignment
DC
Offset Check/Adjustment
Track Servo
Amplitude
Adjustment
Power
Amplifier
Check!
Adjustment
Velocity Gain
Check Adjustment
Fine
Position
Gain
Check!
Adjustment
Integrator Gain
Check/
Adjustment
Servo/Filter
Balance
Check!
Adjustment
Troubleshooting
6-57
Track Pulse
Troubleshooting
Access Troubleshooting
6-9
6-9
6-9
6-10
6-14
6-19
6-20
6-23
6-25
6-27
6-27
6-29
6-29
6-29
6-29
6-29
6-30
6-30
6-31
6-31
6-32
6-34
6-34
6-35
6-37
6-38
6-38
6-39
6-39
6-39
6-41
6-41
6-42
6-42
6-43
6-43
6-43
6-44
6-46
6-47
6-48.
1
6-48.
1
6-50
6-50
6-53
6-55
C
C
C
C
C
C
C
C
6-57
6-58
viii
70614600
K
C

FIGURES
2-1
Controls and
Indicators
3-1
Cabinet
Intracabling
Diagram
3-2
System Intercabling
4-
1
Input/Output
Signal
Gating
4-2
Select
Sequence
4-3 Block
Diagram
4-4 Servo
Circuit
Block
Diagram
4-5
Typical Servo
Signal
Relationships
4-6
Fine
Position
Servo
Signals
4-7
Power Supply
- AC/DC
Distribution
4-8 Power Supply
-
Sequencing
4-9
Deck
Assembly
4-10
Spindle Assembly
4-11
Actuator Assembly Elements
4-12
Head
Loading
4-13
Head/Arm
Assembly
Motion
4-14 Index/Sector
Detection
4-15 Velocity
Detection
4-16
Track
Servo
Dectection
4-17 Track
and
EOT
Pulses
4-18 Blower
System
6-1 Cabinet Filters
6-2
Pack
Cleaning
Brushes
6-3 Head
Identification
6-4
Head
Adjustment Trace
6-13
6-5
Head/Arm
Assembly Adjustment
6-15
6-6
Head/Arm
Replacement
6-16
6-7
Head/Arm
Installation
or
Removal
6-17
Symmetry
Adjustment
6-20
Read
Oscillator
Output
Waveform
6-21
Symmetry
Strobe
Relation
6-22
Main
Deck
Underside
6-24
Motor
and
Brake
Assembly
6-26
Index Sensor
6-33
Index
to Burst Period
6-36
Detector Trace
6-37
Index
Transducer
Trace
6-38
Disk
Cleaner
Adjustment
6-40
Read/Write
Head
Cable
Connections
6-42
6-18
Velocity
Transducer
Replacement
6-45
6-19
Carriage
Alignment
6-47
6-20
Power Amplifier
Adjustment
6-49
6-21 Velocity Gain
Adjustment
6-51
6-22
Fine
Position Gain
Adjustment
6-52
6-23
Integrator
Gain
Adjustment
6-55
6-24
Servo
Filter
Balance
Adjustment
6-56
TABLES
2-1
4-2 Servo
Circuit
Functions
4-17
6-i Read/Write
Head
Replacement
3-5
Data
6-18
4-4
I
6-8
6-9
6-9.1
6-10
6-li
6-12
6-13
6-14
6-15
6-16
6-17
2-7
3-3
3-4
4-2
4-2
4-3
4-15
4-16
4-21
4-24
4-26
4-30
4-32
4-34
4-36
4-38
4-40
4-40
4-42
4-43
4-44
6-4
6-8
6-12
2-1 Controls and
Indicators
3-1 Input/Output Connector
Pin
Assignments
4-1
Input/Output
Lines
70614600
J
ix

C
C
CI
C

SECTION
1
GENERAL
DESCRIPTION
4A

GENERAL DESCRIPTION
INTRODUCTION
The
CONTROL DATA
®
Disk Storage Unit is a high
speed,
random access, data
storage
device that interfaces
with a central
processor via a control unit.
The
electro-mechanical
Disk Storage Unit
(DSU)
positions its
read/write
heads to
discrete
positions
or
tracks
over spinning disk surfaces. Data, in the
form of
magnetized
bits
or spots, is written on
or
read
from the disk surfaces
by
the
read/write
heads.
The disk
pack assemblies used
by
the DSU
provide position
feedback from
specially
recorded tracks
on
one surface of the disk pack.
The
deck assembly
contains the access mechanism that positions the
read/write
and
track
servo heads, as
well
as five Silicon Peripheral Logic
(SPL)
cards
involved in
track detection and
Read/Write
operations. This
assembly also
includes
spindle
assembly, spindle
drive motor,
and shroud, the mounting and operational
facilities
required
by
the disk pack. The shroud surrounds the disk pack
and
thereby minimizes
the possibility of damage to the
read/write
heads and disk
surfaces caused
by
ingestion
of
dust.
A
hinge-mounted
logic chassis
assembly is
the mounting point
for
the
main
complement of the
logic cards used by the deck: five cards are
mounted on the
deck
assembly.
Cards for
the
cabinet are mounted
in
four rows
(A
through
D).
This
assembly also contains a maintenance panel which provides
jacks
to
monitor
logic voltages, a switch/lamp
combination to analyze the unit status
and
switches
to control
the DSU operational status.
A
solid-state power
supply
assembly provides
±
5,
±
20,
±
36, and +40-vdc
outputs.
70614600A
1-1

C
C
A
frame
assembly
provides
the
required
mounting-structure
for
the
previously
mentioned
assemblies.
In addition to the
structural elements,
this
assembly
contains
the operator
controls for
the
deck
and
a
blower
assembly. The
output
of
the
blower
assembly is
ducted to the
deck assembly
to provide
positive
pressurization
of
the disk pack
and
shroud
area.
It also
provides
cooling air to
the
power supply
and logic
chassis.
-
EQUIPMENT SPECIFICATIONS
ACCESSING
TIME
C
Maximum
Access
Time
70
ms
Maximum
One-Track Access
Time 10
ms
Average
Access
Time
35
ms
C
RECORDING
Mode Double
frequency
Density
(nominal)
1530
bpi
(outer track)
2220
bpi
(inner
track)
Bit
Rate
(nominal)
2. 50
MHz
Data
Transfer
Rate
312,
500
characters/second
Bits
/Character
8
Character/Track
7,
812
(J
Tracks
/Cylinder
19
Cylinders
/DSU 400
+ 6 spares
DSU/System
8
maximum
DATA CAPACITY
C’
Bits/Track
62,
500
nominal
Bits
/Cylinder
1, 187,
500 nominal
Bits/DSU
475, 000,000 nominal
C
C
L
1-2
70614600
A
C

DISK
PACK
Disks/Disk
Pack
Useable Recording
Surfaces
/Disk
Pack
Disk Surface
Diameter
Recording
Diameters
Disk
Surface
Coating
Disk
Pack
Velocity
READ/WRITE
HEADS
Heads/Unit
Read/Write Track
Width
Erase
Track
Width
Track
Spacing
Read/Write
to
Erase
Gap
PHYSICAL - EACH
CABINET
11
19
14
inches
Track
405
(Inner)
8.
760
inches
nominal
Track
0
(Outer)
13.
200
inches
nominal
Magnetic
Oxide
2400
*
2%
rpm
19
0.
004
inch
nominal
0.
0055
inch
nominal
0.
00505 inch
nominal
0. 045
inch
nominal
Height
Width
Depth
Weight
ELECTRICAL
38 inches
(96.
52
cm)
27
1/2
inches (69.85 cm)
37
1/2
inches (95.25
cm)
660 pounds (299.
38 kg)
Power
Source
Operating
Current
Standby
Current
Surge
Current
208
volt
(±10%) BR2A5A
60
±0.
6 Hz,
BR2A5B 50
±0.
5
Hz, three-phase
(two
legs
used)
7
amps
3
amps
22
amps
I
INPUT/OUTPUT
CONNECTIONS
One
connector per
cabinet
located
below
logic
chassis.
Pin
assignment according
to
Table
3-
1.
Connections
according
to Figure
3-2.
1—3
70614600
J

SECTION 2
OPERATION

OPERATION
CONTROLS
AND
INDICATORS
The
DSU
contains a
number
of panels
and indicators.
Figure 2-1
locates the
panels
and the
indicators
on
a typical
cabinet
of the DSU.
A
functional
description of the
controls
and
indicators
is given in
Table 2-1.
Descriptions
assume that AC
power
is applied
to
the unit
by the
controller.
TABLE 2-1.
CONTROLS AND
INDICATORS
Control Or
Indicator
I
Function
Operator
Panel
START
switch/indicator
Switch energizes
(when
pressed
to light)
spindle
drive
motor and begins the First
Seek sequence
provided the following
conditions
are met:
1. Disk pack
is in place and
cannister
removed.
2.
Front
and top covers are closed.
3. Proper circuit breakers
are
on.
4. DC
switch is
on.
Lights
when switch is on even
if one
or more
of the above conditions
is not met.
This allows
operator to
know
which
units will begin
power-on
sequence when the above
conditions
are met.
Switch causes a
power-off sequence when
pressed with the indicator lighted.
70614600 A
2-1

C
TABLE
2-1.
CONTROLS
AND INDICATORS
(Cont’d)
C
WARTUNG (MAINTENANCE)
indicator
SCHREIBEN
GESPERRT
(WRITE
LOCKOUT)
switch/indicator
FEHLER
(FAULT)
switch/indicator
BEREIT
indicator
lights when
Operable
signal
is
being
sent
from
the DSU
to
the
control
unit. The
following
conditions
must be met
for
the
unit to
originate
an Operable
signal:
1.
Heads
loaded.
2.
No
fault
conditions.
3. Up
to
speed
(spindle
rpm greater
than
2200)
4. Logic Number
plug
installed.
5.
Unit
is on
line.
6.
COP
signal
from
control
unit
is
at
-30 volts.
WARTTJNG
indicator
lights
when
either
the
logic
chassis
maintenance
panel
DC
switch
is
set to
OFF
or the
ON
LINE/OFF
LINE
switch is
set to
OFF
LINE.
Switch
(when
pressed
to light)
inhibits
the
ability
of the
related
DSU
to perform
a
write
operation.
Switch
removes
the
inhibit
condition
when
pressed
with
the
indicator
lighted.
Lights
when
one
or
more of
the
following
unwanted
conditions
occur:
1.
More
than one head
is selected.
2.
Read
and Write
Selects
exist
at
the
same
time.
3.
Read
and
Erase
Selects
exist
at the
same
time.
4.
Erase is
selected
with
no write
driver.
5.
Erase
is selected
with
both
write
drivers.
6.
Either
one
or
both
write
drivers are
on
with
no
erase.
7.
Read,
write,
or
erase
is selected
without
an
On
Cylinder
signal.
BEREIT
(READY)
indicator
Control
Or
Indicator
Function
C,
C
C
C
C
C
2-2
70614600
A