Digital Equipment RA81 User Manual
EK-ORAS1-UG-
001
RA81
User
. Disk Drive
Guide
EK-ORA81-UG-
001
RA81
User
Disk Drive
Guide
Prepared
Digital Equipment Corporation
by
Educational Services
of
Copyright © 1982
All Rights Reserved
by
Digital Equipment Corporation
The
material
in
this manual is for informational purposes and is subject to change
without notice.
Digital Equipment Corporation assumes no responsibility for any errors which
may appear
in
this manual.
Printed
in
U.S.A.
This document was set on DIGITAL's computerized type-setting system.
• Class A Computing Devices:
Notice:
The equipment has been type tested and found to
Class A computing device pursuant to Subpart J
are designed to provide
terference when operated
ment
own expense may be required
This equipment generates, uses, and may emit radio frequency energy.
comply with the limits for a
of
Part 15
of
FCC Rules
..
reasonable protection against such radio frequency
in
a commercial environment. Operation
in
a residential area may cause interference
to
take measures
in
which case the user
to
correct the interference.
of
this equip-
which
in-
at
his
following are trademarks
The
chusetts:
DEC
DECUS
DIGITAL
Digital
Logo
PDP
UNIBUS
VAX
of
Digital Equipment Corporation, Maynard, Massa-
DECnet
DECsystem-10
DECSYSTEM-20
DECwriter
DIBOL
EduSystem
lAS
OMNIBUS
OS/8
PDT
RSTS
RSX
VMS
VT
MASSBUS
11
CONTENTS
Page
CHAPTER 1
1.1
1.2
1.3
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.4
1.5
1.6
CHAPTER 2
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.2
2.2.1
2.2.2
2.2.3
2.3
2.3.1
2.3.2
2.3.3
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.4.9
INTRODUCTION
PURPOSE AND SCOPE
GENERAL INFORMATION
DRIVE DESCRIPTION
Head Disk Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Internal Drive Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multi-Drive and
Recording Features
Media Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RELATED
RA81
RA81
INSTALLATION
SITE PREPARATION AND PLANNING
Environmental Considerations
Cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floor Loading
Heat Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power and Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC
EQUIPMENT UNPACKING AND EXTERNAL INSPECTION. . . . . . . . . . . . . 2-2
Unpacking the System on a Shipping
Installing the Cabinet Levelers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Removing Internal Shipping Brackets and
RA81
Connecting Cabinets
External SDI Cabling Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Programming the Drive Unit Address Plug . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
RA81
Remove the Front Trim Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Install the Slide Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove the Internal Shipping Brackets and
Mount the RA81 on the
Program the Drive
Connect the Electrostatic Discharge
Install the Internal SDI Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
Mount the
Install the Drive Sequence Cables
DOCUMENTATION
SPECIFICATIONS
OPTIONS
Power Wiring
Packing Material
INSTALLATION.
ADD-ON INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Packing Material
...................................................
I/O
Bulkhead.
............................................
... " .. " ..............
.............................................
Dual-Port Capability
.............................................
... , ...............
...........................
..................
.................................................
..............................................
...........................................
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
............................................
...........................................
Slides.
Unit Address Plug
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
..............................
.............
Pallet
. . . . . . . . . . . . . . . . . . . . . .
Bracket.
.................................
.........................
...................
. . . . . . . . . . . . . . . . . . . . . . . . 2-30
"
....... , '"
, "
.. " ........
'.
. . . . . . . . . . . . . . . . 1-9
~
................
;<
. . . . . . . . . . . . . . . . .
..
. . . . . . . . . . . 2-25
. . . . . . . . . . . 2-30
. " . .
'"
1-1
1-1
1-2
11-5
11-
. 1-8
1-12
,
2-1
2-1
2-1
2-1
2-1
2-1
2-2
2-2
2-6
2-10
2-
21
2-
25
2-33
2
7
7
1II
Page
QHAPTER 2
2.4.10
204.11
2.S
2.S.1
2.S.2
2.S.3
CHAPTER 3
3.1
3.1.1
3.1.2
3.1.3
3.1.4
3.1.S
3.2
3.3
3.3.1
3.3.2
3.3.3
3.4
3.4.1
3.4.2
304.3
INSTALLATION (Cont)
Connect AC Power
Route and Clamp the Cables
RA81 DRIVE
The Diagnostic Terminal
Applying
Checkout
OPERA TING INSTRUCTIONS
CONTROL
RUN/STOP
FA
UL
UNIT/READY
WRITE
A and B
CIRCUIT BREAKERS
DRIVE
Spin-Up
Spin-Down
Removing RA81
CUSTOMER
Air-Filter
Cleaning
Replacement
DIAGNOSTIC
Power to the Drive
....................................................
PANEL SWITCHES AND INDICATORS
Switch and Indicator
T Switch and Indicator
PROT
Port Select Switches
OPERATION
.....................................................
.......
CARE
....................................................
.....................................................
..................................................
.. , .........................................
CHECKOUT
........................................
................................................
................................................
.........................................
........
"
......
Power
.....................
...............................................
.....................................
............................
....................................
..........
.................................
....................................
....................................
,
............................
"
.....................
'
....................
,
...
,
....... , ...
'"
"
..
.,
"
, .
.
2-36
.
2-36
.
2-38
.
2-38
.
2-39
.
2-39
.
3-1
.
3-2
.
3-3
.
3-S
.
3-S
.
3-6
3-6
.
3-6
3-6
.
3-6
3-6
.
3-6
.
3-6
.
.
3-7
.
3-7
APPENDIX A
A.l
A.2
A.3
AA
A.S
A.6
A.7
A.8
A.9
A.I0
FIGURES
1-1
1-2
1-3
1-4
1-5
1-6
1-7
2-1
2-2
2-3
2-4
2-5
2-6
DIAGNOSTIC TERMINAL INSTRUCTIONS
INTRODUCTION
SHIFf
CONTROL
CONTINUE (CONT) AND
X-ON, X-OFF KEYS
DELETE
DISPLAY
BREAK
CR
ESCAPE
The RA81 Disk Drive
Basic RA81 Disk-Subsystem Block Diagram
Hinged Circuit-Module Arrangement
Bingle-Port, Multi-Drive Configuration
Dual-Port Configuration
HDA
RA81
RA81 Electrical
Unpacking a
Building the Ramp
Shipping Bracket Removal
Cabinet Leveler Installation
Leveler Adjustment
KEyS
CHARACTERS
KEy
SCROLL SWITCH
KEy
KEY (CARRIAGE RETURN)
KEy
Head Arrangement
Sector Format
..................................
.....................................................
.........................................
CLEAR
.... , ....... , .................................
....................................................
.....................................................
....................................................
..............................................
............................................
..................
...............................................
Plugs and Receptacles
System
on
a Shipping Pallet
.................................................
..........................................
.........................................
................................................
(CLR) KEYS
.......................................
....................................
...........................
..................................
................................
................................
..............................
,
'
...............
......................
.........................
.
A-I
.
A-2
A-2
.
.
A-2
A-2
.
A-2
.
A-2
.
.
A-3
.
A-3
.
A-3
.
1-3
.
1-4
.
I-S
.
1-6
.
1-6
.
1-7
.
1-7
.
2-2
.
2-3
.
2:-4
.
2-S
.
2-S
.
2-6
iv
Page
FIGURES
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14
2-15
2-16
2-17
2-18
2-19
2-20
2-21
2-22
2-23
2-24
2-25
2-26
2-27
2-28
2-29
2-30
2-31
2-32
2-33
2-34
2-35
2-36
2-37
2-38
2-39
2-40
2-41
2-42
2-43
2-44
2-45
3-1
3-2
3-3
A-I
(Cont)
Raising the Drive Logic Chassis Assembly
Foam
Pad Removal
HDA
Details
Belt Tension Lever
Belt tension
End
Panels
Opening the
Back
Door
End-Panel
Connecting the Cabinets
Removing the
Installing the Front Locking Bracket
Installing the
SOl
Cable Shield Terminator Installation
Single Drive External
Drive
Removing Cabinet
Chassis
Mounting Chassis
Mounting Chassis
Mounting the Electrostatic Discharge Bracket
Installation
Installation
Installation
Removal
HDA
Positioner
Extending
Extending the Chassis
Pivot
Wing
Electrostatic Discharge Bracket Details
Cabling for a Two-Drive
Cabling for a Three- and Four-Drive
Connecting
Mounting the
Drive Sequence Cable Installation
Power
Connecting Cable Clamps to Uprights
Cable Routing and Clamping
Diagnostic Terminal Connections
Panel Controls and Indicators
Front Cam-Coded
Air
Filter Removal
Field Service Diagnostic Terminal
Lever
and
Back
and
and
Back
Unit Address Plug
Slide Bracket Installation
of
of
of
of
HDA
Cabinet
Assembly
SOl
I/O
Controller
Swlich
................................................
.....................................................
................................................
and Interlock Switch
Joiner Panels
Door
End-Panel Lock Removal
Bottom Key-Button Removal
Trim
Panel Brackets
Locking Brackets
SOl
Trim
Slide to Front Upright
Slide to Back Upright
Cable Retainer Springs
Drive Detent Latch
Drive Mounting Rails
Cable Connections
Lock
..............................................
Stabilizer
Slides
..............................................
Cable Shield Terminators
Bulkhead Assembly
AC
Receptacles
Cover
.................................................
........................................
.............................................
............................................
Cables
............................................
Panels
System
......................................
.....................................
.........................................
........................................
.....................................
........................................
.....................................
...........................................
.............................
...............................
..............................
............................
...................................
..................................
..................................
..............................
....................................
...............................
...............................
...........................
.................................
....................................
..................................
..................................
................................
System
.................................
....................................
....................................
.................................
...................................
....................................
...........................
.............................
.
2-7
.
2-7
.
2-8
.
2-9
.
2-10
.
2-11
.
2-11
2-12
.
2-13
.
2-14
.
2-15
.
2-16
.
2-17
.
.
2-18
.
2-19
.
2-19
.
2-20
.
2-21
.
2-22
.
2-22
.
2-23
.
2-24
.
2-24
.
2-25
.
2-26
.
2-27
.
2-28
.
2-28
.
2-29
2-30
.
.
2-31
.
2-32
.
2-33
.
2-34
.
2-35
.
2-36
2-37
.
.
2-38
.
2-40
.
3-1
.
3-5
.
3-7
.
A-I
TABLES
1-1
1-2
1-3
3-1
3-2
Related Documentation
RA81 Specifications
RA81 Options
Indicator Conditions
Drive
Front-Panel Fault Identification
.............................................
...............................................
....................................................
...............................................
Codes
v
............................
1-8
.
.
1-9
1-13
.
3-2
.
3-3
.
CHAPTER 1
INTRODUCTION
1.1
PURPOSE AND SCOPE
This manual describes the RA81 Disk Drive and tells
is
This manual
written primarily for the RA81 user except for Chapter 2 which
service personnel.
1.2 GENERAL INFORMATION
The RA81
is
a random-access, moving-head disk drive with non-removable media using a head/disk assembly (HDA). The HDA, a key feature of this drive, protects data and improves hardware dependability.
The RA81 has a data storage capacity of 456 megabytes in 16-bit word format. The RA81 connects to the
controller via the Standard Disk Interconnect
(SDI) bus and may be used with any controller implementing
this bus. Additional disk drives can be connected to a controller to increase the data storage capacity. The
RA81 can also be connected
in
a dual-port arrangement permitting time-shared access by two controllers.
Performance Features
• 17.4 megabit per second peak transfer rate
how
to install, checkout, and operate the equipment.
is
only for qualified field
•
28
ms average positioning rate
• 8.3 ms average rotational latency
Data Integrity
• Protected media
• Microprocessor-controlled servo
• Automatic error correction
Hardware Features
• Simple modular construction
• Rugged design
• Extensive microcode diagnostics
]
-]
NOTE
Like other fixed-media devices, some method
backup should be used to prevent loss
event
of
a failure. The following methods are recom-
of
data in the
of
mended.
File Duplication-Important files should be duplicated often. Usually, this
will
involve
copying the
data on a removable medium such as magnetic tape.
Journaling-The use
of
journaling is recommended in
transaction processing applications. This method allows reconstruction
of
files
up
to the last checkpoint
or backup.
1.3 DRIVE DESCRIPTION
The RA81
The drive has optional slide rails and
rack.
An RA81 Disk Drive subsystem
figuration) and one or more disk drives. Figure
is
a self-contained disk drive with a built-in cooling system and dc power supply. See Figure
is
designed to be inserted into a 19-inch wide RETMA equipment
Up to three drives (one fixed mounted and two mounted
is
made up of an SDI controller (two controllers with the dual-port con-
1-2
shows the relationship between the subsystem compo-
on
slides) can be included in a single cabinet.
1-1.
nents.
All RA81 disk logic
is
included within the drive. Three of the primary circuit modules (servo, microprocessor, and personality) are located directly under the logic access cover on top of the cabinet. These three
modules are mounted
DC operating power for the logic circuits
on
hinges for ease of service. See Figure
is
provided by the drive power supply located inside the back of
1-3.
the drive. Internal fans provide the necessary cooling for the power supply and for other drive components.
The RA81 Disk Drive conforms to UL,
CSA, FCC, and VDE standards.
1.3.1 Head Disk Assembly
The sealed HDA contains the recording media (four platters), rotary positioner, read/write heads, and
preamplifiers.
information used for positioning the read/write heads. The rotary positioner in the HDA
Seven of the platter surfaces are used for recording data. The eighth has dedicated servo
is
controlled by a
slave microprocessor closed-loop servo system. The RA81 uses both dedicated and embedded servo for
head positioning. This dual arrangement allows for coarse cylinder positioning from the dedicated servo
surface and fine cylinder positioning from embedded servo bursts which are read preceding each block of
data. The dedicated servo surface and the embedded servo data are written on the disk
HDA
is
manufactured.
at
the time the
1.3.2 Internal Drive Diagnostics
Two groups of internal diagnostics are used in the RA81 to permit error detection and fault isolation. The
first group of diagnostics
is
run automatically during the power-up sequence to validate initial operations.
Error codes for this test are displayed by indicators
nostics
is
initiated and monitored through a diagnostic terminal as a maintenance function in the off-line
mode. These microcode diagnostics are for field service use only and are not part of the normal operating
functions.
The RA81 has a dual microprocessor (master and slave) control system. The master
croprocessor module and the slave
functions, such
as
servo control, while the other controls status checking. Both microprocessors share the
diagnostic responsibilities.
on
the operator control panel. The second set of diag-
is
located
is
located on the servo module. One microprocessor handles real-time
on
the
1-2
mi-
CZ-0775
Figure
1·1
The RA81 Disk Drive
TO/
FROM
CPU
SDI
CONTROLLER
SDI CABLES
DRIVE
o
r------,
DRIVE :
I 1 I
L
____
---J
r----.
I DRIVE I
L
2 I
____
-.1
r------,
I DRIVE I
L
3 I
____
-1
ADDITIONAL
DRIVES
CZ-0730
Figure 1-2. Basic RA81 Disk-Subsystem Block Diagram
1-4
CHAPTER 1
INTRODUCTION
1.1
PURPOSE AND SCOPE
This manual describes the RA81 Disk Drive and tells
is
This manual
service personnel.
written primarily for the RA81 user except for Chapter 2 which
1.2 GENERAL INFORMATION
The RA81
sembly (HDA). The HDA, a key feature of this drive, protects data and improves hardware dependability.
The RA81 has a data storage capacity of 456 megabytes
controller via the Standard Disk Interconnect
this bus. Additional disk drives can be connected to a controller to increase the data storage capacity. The
RA81 can also be connected in a dual-port arrangement permitting time-shared access by two controllers.
Performance Features
is
a random-access, moving-head disk drive with non-removable media using a head/disk
(SDI) bus and may be used with any controller implementing
• 17.4 megabit per second peak transfer rate
how
to install, checkout, and operate the equipment.
is
only for qualified field
in
16-bit word format. The RA81 connects to the
as-
•
28
ms
average positioning rate
• 8.3
Data Integrity
• Protected media
• Microprocessor-controlled servo
• Automatic error correction
Hardware Features
• Simple modular construction
• Rugged design
• Extensive microcode diagnostics
ms
average rotational latency
I-I
NOTE
Like other fixed-media devices, some method
backup should be used to prevent loss
event
of
a failure. The following methods
of
data in the
are
recom-
mended.
of
File Duplication-Important files should
cated often. Usually, this
will
involve
be
dupli-
copying the
data on a removable medium such as magnetic tape.
Journaling-The use
of
journaling is recommended in
transaction processing applications. This method allows reconstruction
of
files
up
to the last checkpoint
or backup.
1.3 DRIVE DESCRIPTION
The RA81
The drive has optional slide rails and
rack.
An RA81 Disk Drive subsystem
figuration) and one or more disk drives. Figure
is
a self-contained disk drive with a built-in cooling system and dc power supply. See Figure
is
designed to be inserted into a 19-inch wide
RETMA
Up to three drives (one fixed mounted and two mounted on slides) can be included
is
made up of an SDI controller (two controllers with the dual-port con-
1-2
shows the relationship between the subsystem compo-
equipment
in
a single cabinet.
I-I.
nents.
All RA81 disk logic
sor, and personality) are located directly under the logic access cover
modules are mounted
DC operating power for the logic circuits
is
included within the drive. Three of the primary circuit modules (servo, microproces-
on
top of the cabinet. These three
on
hinges for ease of service. See Figure
is
provided by the drive power supply located inside the back of
1-3.
the drive. Internal fans provide the necessary cooling for the power supply and for other drive components.
The RA81 Disk Drive conforms to
UL, CSA, FCC, and VDE standards.
1.3.1 Head Disk Assembly
The sealed HDA contains the recording media (four platters), rotary positioner, read/write heads, and
preamplifiers. Seven of the platter surfaces are used for recording data. The eighth has dedicated servo
information used for positioning the read/write heads. The rotary positioner in the HDA
is
controlled by a
slave microprocessor closed-loop servo system. The RA81 uses both dedicated and embedded servo for
head positioning. This dual arrangement allows for coarse cylinder positioning from the dedicated servo
surface and fine cylinder positioning from embedded servo bursts which are read preceding each block of
data. The dedicated servo surface and the embedded servo data are written
HDA
is
manufactured.
on
the disk
at
the time the
1.3.2 Internal Drive Diagnostics
Two groups of internal diagnostics are used in the RA81 to permit error detection'and
first group of diagnostics
Error codes for this test are displayed by indicators
nostics
is
initiated and monitored through a diagnostic terminal as a maintenance function in the off-line
is
run automatically during the power-up sequence to validate initial operations.
on
the operator control panel. The second set of diag-
fault isolation. The
mode. These microcode diagnostics are for field service use only and are not part of the normal operating
functions.
The RA81 has a dual microprocessor (master and slave) control system. The niaster
croprocessor module and the slave
functions, such
as
servo control, while the other controls status checking; Both microprocessors share the
is
located on the servo module. One microprocessor handles real-time
'located on
the
mi-
is
diagnostic responsibilities.
1-2
"
IIliiiIiIIiIiii.UHlliUiIIIlifiiRiUliilM9f1
~
........
uHdinii
.1.
I
!
Figure
1-1
The RA81 Disk Drive
CZ-0775
1-3
TO/
FROM
CPU
SDI
CONTROLLER
SDI CABLES
DRIVE
o
,------,
DRIVE I
I 1 I
L
____
---J
r-----,
I DRIVE I
L
2 I
____
--1
,----,
I DRIVE I
L
3 I
____
--1
ADDITIONAL
DRIVES
CZ-0730
Figure 1-2. Basic RA81 Disk-Subsystem Block Diagram
1-4
1.5 RA81
SPECIFICATIONS
Table 1-2 gives the primary performance, power, environmental, and physical characteristics
Disk Drive.
NOTE
The term operating, under the specification section
of
the table, indicates those values
that
must not be
exceeded while the drive is operational. The term
non-operating indicates those values
be exceeded when the drive is being stored
that
must not
or
in a
non-operating condition. Exceeding these values can
damage the drive when power is applied. Adhering to
that
these values ensures
the drive operates correctly
when power is applied.
Table 1-2 RA81 Specifications
of
the RA81
Characteristic
Data
storage capacity
(Single drive)
16-bit word format
Media
Head
type
disk assembly(HDA)
Number
of disks
Disk surfaces
Number
of
heads (groups)
Heads per disk surface
Cylinders per
Sectors per
head
track
16-bit word format
Servo system
Performance characteristics
Disk encoding method
Linear bit density
Bytes per
Transfer
track
rate
(unformatted)
Bit cell period
Read
initialization time
Write-to-read recovery
Specification
456
MB
Winchester double density
4
7 data, 1 servo
14 data, 1 servo
2
1258 (numbered 0 through 1257)
52
Dedicated
and
embedded
3/2
11,400 bpi, 8550
flux changes per
inch
at
inner group
36,352
17.4 megabits per second
57 ns (nominal)
10 microseconds (ex-
data
cluding
separator
sync)
1-9
Table 1-2 RA81 Specifications (Cont)
Characteristic
Read-to write recovery
Data
separator
synchronization
Rotational latency
Rotational speed
Average rotational latency
Maximum rotational latency
Head
switch latency (switch
on a given cylinder)
Average seek
One cylinder
Maximum seek
Disk rotation
Start
start/stop
time
Stop time
Maximum
start/stop
times
frequency
Specification
1 microsecond
10
microseconds
3600 rpm, + 2.5%, - 3.5%
8.33 ms
16.66 ms
6 ms maximum
28
ms maximum
7 ms maximum
50 ms (1258 cylinders)
20 seconds maximum
20 seconds maximum
6
(3
minutes between cycles
with drive powered up and
ready during one of the
3-minute cycles)
Physical characteristics
(Drive only)
Width (nominal)
Depth (nominal)
Height (nominal)
Weight (approx.)
Environmental limits
Temperature
Operating
Non-opera ting
Relative humidity
Operating
44.5 centimeters (17.50 in.)
67.3 centimeters
(26.50 in.)
26.4 centimeters (10.38 in.)
67.1 kilograms (148 pounds)
10 to 40 degrees C (50 to 104
degrees F) with a temperature
gradient of
(36 degrees F
20 degrees
/hour)
C/hour
- 40 to + 60 degrees C
( - 40 to + 140 degrees F)
10%
to 85% (non-condensing)
with a maximum wet bulb
temperature of
28
degrees C
(82 degrees F) and a minimum
dew point of 2 degrees C
(36 degrees F)
1-10
Table 1-2 RA81 Specifications (Cont)
Characteristic
Shipping and storage
Heat
dissipation
Altitude
Operating
Non-opera ting
and shipping
Power
Voltage requirements
(Single phase)
Specification
10%
to
85%
with
no
condensation
644 watts (nominal)
Sea level to 2400 meters
(8000 feet) above sea level.
Note: Maximum allowable temperatures are reduced by a
factor of 1.8 degrees
meters
for operation
(1
degree F /1000 feet)
at
C/1000
higher
altitude sites
300 meters (1000 feet) below
sea level to
9000 meters
(30000 feet) above sea level
(actual or by means of cabin
pressurization)
120 volt, 60
220-240 volt, 50 drives
Current requirements
Starting current for
120 volt ac drives
Running current for
120 volt ac drives
Starting current for
220-240 volt ac drives
Running current for
220-240 volt ac drives
Power requirements
Starting power for
120 volt ac drives
Hz
drives
90-128 volts ac, 60 plus
or minus 1
Hz
184-256 volts ac, 50 plus
or minus 1
35
ampere peak surge for
Hz
4 seconds
7.8 amperes rms
at
120 volts
18
ampere peak surge for
4 seconds
3.5 amperes rms
at
240 volts
4200 watts
at
120 volts
I-I
I
Table 1-2 RA81 Specifications (Cont)
Characteristic
Running power for
120 volt ac drives
Starting power for
220-240 volt ac drives
Running power for
220-240 volt ac drives
Power factor
Line cord length
(from cabinet)
Plug type
120 volts,60 Hz
Specification
644 watts
4320 watts
496 watts
at
120 volts
at
240 volts
at
240 volts
0.9
259 cm (8.5 feet)
Hubbe1 No.2611
NEMA
DEC
No.L5-30P
No.12-11193
(See Figure 2-1)
240 volts, 50Hz
1.6 RA81 OPTIONS
Table
All RA81 options
1-3
lists the RA81 options.
in
Table
1-3
include a 12-foot, shielded, inter-cabinet cable.
because of the dual-access feature, order cable
feet),or BC06V-80 (80 feet).
Hubbel No.2321
NEMA
DEC
(See Figure
No.L6-20P
No.12-11192
2-1
If
a longer cable
is
required
BC06V-12 (12 feet), BC06V-25 (25 feet), BC06V-50 (50
1-12
Table 1-3 RA81 Options
Option
RA81-AA
RA81-AD
RA81-CA
RA81-CD
RA81-EA
RA81-ED
RUA81-AA
RUA81-AD
RUA81-CA
RUA81-CD
RUA81-EA
RUA81-ED
RUA81-JA
RUA81-JD
Description
456 MB drive, 120 V AC, 60 Hz,
456 MB drive,240 VAC,
50
RA81-AA, H9642-AP cabinet,
RA81-AD, H9642-AR cabinet, 50
no
HZ,no
60
cabinet
cabinet
Hz
Hz
(3) RA81-AA, H9642-AP cabinet, 60
(3) RA81-AD, H9642-AR cabinet, 50
RA81-AA,
RA81-AD,
RA81-CA,
RA81-CD,
RA81-EA,
RA81-ED,
RA81-CA, (2)
RA81-CD, (2)
UDA50,
no cabinet
UDA50, no cabinet
UDA50, cabinet
UDA50, cabinet
UDA50, cabinet
UDA50, cabinet
UDA50, cabinet
UDA50, cabinet
Hz
Hz
1-13
CHAPTER 2
INSTALLATION
2.1
SITE
PREPARATION AND PLANNING
A certain amount of preparation and planning
paragraphs that follow discuss some of the points that should be considered.
2.1.1 Environmental Considerations
The RA81
altitude limits must be considered before the drive
mental characteristics.
2.1.2 Cleanliness
Because the RA81 has a sealed HDA, dust particles should not be able to enter the area where the recording media
ment possible.
2.1.3 Floor Loading
The weight of one RA81 cabinet and disk drive
drive weighing approximately 67.1 Kg (148Ibs). A completely loaded RA81 cabinet (approximately 283
Kg or 6241bs) should not place any abnormal stress on a raised computer room floor. However, the weight
of existing equipment should be considered before installing additional drives.
is
designed to operate in a business or light industrial environment. Temperature, humidity, and
is
located. However, it
is
still desirable that the equipment be operated in the cleanest environ-
is
necessary before installing the RA81 Disk Drive. The
is
installed. Refer to Table 1-2 for figures
is
approximately 148.8 Kg (328 lb) with each additional
on
environ-
2.1.4
The heat dissipation
requirements for the complete system can be computed by multiplying this figure by the number of drives,
adding the heat dissipation figures of the other system components, and then adjusting the total figure to
allow for cooling system efficiency and any other factors.
2.1.5 Power and
The RA81
wiring
for future expansion. The circuit breaker on the back of the power controller regulates the power to every
drive within the cabinet.
Heat
Dissipation
of
each RA81 may reach approximately 2200 Btu/hour. The approximate cooling
Safety Precautions
WARNING
Hazardous voltages
ment. Installation and servicing should be performed
by
a qualified and trained service person. Bodily in-
jury
or
equipment damage may result from incorrect
servicing. Refer to the RA81 Service Manual for
proper instructions.
will
not cause any unusual fire or safety hazards to other computer equipment. The ac power
in
the computer system should be carefully checked, however, to be sure there
are
present inside this equip-
2-1
is
adequate capacity
2.1.6
The wiring used by Digital Equipment Corporation conforms to
graph 1.3. This means the wire used
load current (except
AC
Power Wiring
UL
and other standards listed in Para-
as
equipment ground
in
an emergency), but does carry leakage current. All equipment
is
green and yellow. The ground wire carries
is
shipped with a
no
grounding connection on its frame. The ac return line (also called the identified conductor, neutral, common, and cold lead)
is
blue. The ac return line must not be used to ground equipment since its purpose
is
to
conduct current.
The ac input line (brown wire)
ac plugs and receptacles used
120V
30
1-PHASE
240 V 50Hz
15
1-PHASE
NOTE:
PIN
POWER CONTROLLER
Figure
2-1
is
also called the hot wire. Its purpose
on
the RA81 are shown in Figure 2-1.
PLUG
60
Hz
A
A
CONFIGURATIONS
HUBBEL
#2611
NEMA = L5-30P
DEC = 12-11193
HUBBEL
#2321
N
DEC#12-11192
w~
@
EMA # L6-20P
OF
PLUGS EXITING
IN
CABINET.
#2610
L5-30R
12-11194
#2320
L6-20R
12-11191
RA81 Electrical Plugs and Receptacles
is
to supply current to the system. The
RECEPTACLE
@
G
X
@
CZ-0740
2.2
EQUIPMENT
When delivered, the RA81 equipment
UNPACKING AND EXTERNAL
is
packed in a cardboard container attached to a shipping skid or
INSPECTION
pallet. Refer to Figure 2-2.
Before unpacking the equipment, check for external shipping damage. Report any damage to the DIGI-
TAL
Field Service or Sales Office and to the local carrier. Keep all packing material and receipts when a
damage claim
is
filed.
2.2.1 Unpacking the System on a Shipping Pallet
To unpack the equipment and remove it from the pallet, proceed
1.
Remove all packing materials.
2.
Remove the four shipping bolts that fasten the drive cabinet to the pallet. Refer to the inset
as
follows using Figure 2-2 as a guide.
Figure 2-2.
2-2
in
SHIPPING
STRAPS
Figure 2-2 Unpacking a System
3.
Build the ramp (Figure 2-3) to aid in rolling the disk drive off the pallet.
1.
Remove the plastic package containing the lag screw and nails from the bottom of the
ramp.
2.
Connect the ramp support block to the front of the shipping pallet with the lag screw.
3.
Nail the ramp to the top of its support block using the two nails provided.
on
a Shipping Pallet
2-3
CZ-0564
LAG SCREW
PALLET
RAMP
SUPPORT BLOCK
CZ-Q735
Figure
2-3
Building the Ramp
WARNING
will
be
At least two persons
next step
of
this procedure because
needed to perform the
the cabinet.
4.
Remove the four wooden blocks under the drive cabinet.
5.
Carefully roll the drive cabinet down the ramp.
2.2.2 Installing the Cabinet Levelers
Use the following procedure to install the cabinet levelers.
1.
Wheel the equipment cabinet to the correct location before installing the levelers.
2.
Unbolt and remove the four red shipping brackets and leveler nuts
3.
Assemble the four levelers as shown
in
Figure 2-5. Screw each leveler through the nut until it .
may be positioned into place without raising the cabinet. See inset
of
the weight of
as
shown in Figure 2-4.
in
Figure 2-5.
2-4
..h~:....---
................
LEVELER NUT
~.J>~-
RED
SHIPPING
BRACKET
Figure 2-4 Shipping Bracket Removal
ill
~LEVELERNUT
®
FLAT
WASHER
[!]
@ LOCK WASHER
®
HEX
NUT
CZ·OS88
Figure 2-5 Cabinet Leveler Installation
4. Slide the leveler into the slots in the cabinet
made with the floor.
5.
Adjust until the cabinet
See Figure 2-6.
is
level.
CZ-0736
as
shown. Screw the leveler down until solid contact is
2-5
"'------_d'
CZ-0737
2.2.3
Figure
Removing Internal Shipping Brackets and Packing Material
2-6
Leveler Adjustment
Packing material and shipping brackets are inside the cabinet of each disk drive. Use the following procedure to remove this material and to prepare the drive for operation.
1.
Raise the logic access cover by turning the lock 90 degrees counterclockwise. Refer to Figure
2-7.
2.
Fold out the servo and personality modules. Remove the foam shipping pads between the modules (Figure 2-8).
3.
Return the modules to their original position and lock the logic access cover back in place.
4.
Raise the drive logic chassis assembly by pushing in
front bezel (Figure 2-7).
Use a screwdriver blade to trip the latch.
on
the latch behind the center slot in the
2-6
LOGIC ACCESS
COVER
/
LOGIC ACCESS
COVER LOCK
CZ-0739
Figure 2-7 Raising the Drive Logic Chassis Assembly
LOGIC ACCESS
COVER
SERVO
MODULE
PERSONALITY
MODULE
FOAMPADS14~======~~========~)
U~
m 0
moo
00100
all
00
ooooom
00000
00001
Figure 2-8 Foam Pad Removal
CZ-0738
2-7
Loading...