Digital Equipment RA81 User manual

EK-ORAS1-UG- 001
RA81 .Disk Drive
User Guide

EK-ORA81-UG- 001
RA81 Disk Drive
User Guide
Prepared by Educational Services
of
Digital Equipment Corporation

Copyright © 1982 by Digital Equipment Corporation
All Rights Reserved
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: This equipment generates, uses, and may emit radio frequency energy.
The equipment has been type tested and found to comply with the limits for a
Class A computing device pursuant to Subpart J of Part 15 of FCC Rules .. which
are designed to provide reasonable protection against such radio frequency
in-
terference when operated in a commercial environment. Operation of this equip-
ment
in a residential area may cause interference in which case the user at his
own expense may be required
to take measures to correct the interference.
The following are trademarks
of Digital Equipment Corporation, Maynard, Massa-
chusetts:
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DECUS
DIGITAL
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UNIBUS
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VT

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
CONTENTS
Page
INTRODUCTION
PURPOSE AND SCOPE ............................................ 1-1
GENERAL INFORMATION ... " .. " .............. " ....... , '" . " . . 1-1
DRIVE DESCRIPTION ............................................. 1-2
Head Disk Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Internal Drive Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1- 2
Multi-Drive and Dual-Port Capability
.............................. 1-5
Recording Features ............................................. 1- 7
Media Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1- 7
RELATED DOCUMENTATION
... , ............... , " .. " ........ '" . 1-8
RA81 SPECIFICATIONS
........................... '. . . . . . . . . . . . . . . . . 1-9
RA81 OPTIONS
................................................... 1-12
INSTALLATION
SITE PREPARATION AND PLANNING ............. ~ ................ , 2-1
Environmental Considerations .................. ;< ................. 2-1
Cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Floor Loading ................................................. 2-1
Heat Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Power and Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
AC Power Wiring .............................................. 2-2
EQUIPMENT UNPACKING AND EXTERNAL INSPECTION. . . . . . . . . . . . . 2-2
Unpacking the System on a Shipping Pallet
......................... 2-2
Installing the Cabinet Levelers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Removing Internal Shipping Brackets and
Packing Material ........................................... 2-6
RA81
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Connecting Cabinets ............................................ 2-10
External SDI Cabling Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Programming the Drive Unit Address Plug . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
RA81 ADD-ON INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Remove the Front Trim Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Install the Slide Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 21
Remove the Internal Shipping Brackets and
Packing Material ........................................... 2- 25
Mount the RA81 on the
Slides. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 2-25
Program the Drive Unit Address Plug
................... . . . . . . . . . . . 2-30
Connect the Electrostatic Discharge Bracket. . . . . . . . . . . . . . . . . . . . . . . . . 2-30
Install the Internal SDI Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
Mount the I/O
Bulkhead. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
Install the Drive Sequence Cables
................................. 2-33
1II

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
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
INSTALLATION (Cont)
Connect AC Power .. , ......................................... .
Route and Clamp the Cables
..................................... .
RA81 DRIVE DIAGNOSTIC
CHECKOUT ............................ .
The Diagnostic Terminal
........................................ .
Applying Power to the Drive
.................................... .
Checkout
.................................................... .
OPERATING INSTRUCTIONS
CONTROL PANEL SWITCHES AND INDICATORS .......... , ... '" ., .
RUN/STOP Switch and Indicator ................................. .
FA
UL T Switch and Indicator .................................... .
UNIT/READY
................................................ .
WRITE PROT ................................................ .
A and B Port Select Switches
.................................... .
CIRCUIT BREAKERS ......................................... .
DRIVE OPERATION
........ , ............................ " .. "
Spin-Up
..................................................... .
Spin-Down ....... " ...... " ..................... , ....... , ... , .
Removing RA81 Power
..................... ' .................... .
CUSTOMER CARE ............................................... .
Air-Filter
.................................................... .
Cleaning
..................................................... .
Replacement
.................................................. .
DIAGNOSTIC TERMINAL INSTRUCTIONS
INTRODUCTION .................................. ' ............... .
SHIFf KEyS ..................................................... .
CONTROL CHARACTERS ......................................... .
CONTINUE (CONT) AND CLEAR (CLR) KEYS ...................... .
X-ON, X-OFF KEYS .... , ....... , ................................. .
DELETE KEy .................................................... .
DISPLAY SCROLL SWITCH ....................................... .
BREAK KEy ..................................................... .
CR KEY (CARRIAGE RETURN) .................................... .
ESCAPE KEy .................................................... .
The RA81 Disk Drive
.............................................. .
Basic RA81 Disk-Subsystem Block Diagram
........................... .
Hinged Circuit-Module Arrangement
.................................. .
Bingle-Port, Multi-Drive Configuration ................................ .
Dual-Port Configuration ............................................ .
HDA Head Arrangement .................. , ......................... .
RA81 Sector Format
............................................... .
RA81 Electrical Plugs and Receptacles
................................ .
Unpacking a System
on a Shipping Pallet .............................. .
Building the Ramp
................................................. .
Shipping Bracket Removal
.......................................... .
Cabinet Leveler Installation
......................................... .
Leveler Adjustment
................................................ .
iv
Page
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
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

FIGURES (Cont)
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
TABLES
1-1
1-2
1-3
3-1
3-2
Raising the Drive Logic Chassis Assembly
............................. .
Foam Pad Removal ................................................ .
HDA Details ..................................................... .
Belt Tension Lever
................................................ .
Belt tension
Lever and Interlock Switch ............................... .
End Panels and Joiner Panels ........................................ .
Opening the
Back Door ............................................. .
Back
Door and End-Panel Lock Removal .............................. .
End-Panel
and Bottom Key-Button Removal ............................ .
Connecting the Cabinets
............................................ .
Removing the
Trim Panel Brackets ................................... .
Installing the Front Locking Bracket
.................................. .
Installing the
Back Locking Brackets .................................. .
SOl Cable Shield Terminator Installation .............................. .
Single Drive External SOl Cables .................................... .
Drive Unit Address Plug
............................................ .
Removing Cabinet
Trim Panels ...................................... .
Chassis Slide Bracket Installation
..................................... .
Mounting Chassis Slide to Front Upright
............................... .
Mounting Chassis Slide to Back Upright
............................... .
Mounting the Electrostatic Discharge Bracket
........................... .
Installation
of Cable Retainer Springs ................................. .
Installation
of Drive Detent Latch .................................... .
Installation
of Drive Mounting Rails .................................. .
Removal
of HDA Cable Connections .................................. .
HDA Positioner Lock .............................................. .
Extending
Cabinet Stabilizer ......................................... .
Extending the Chassis Slides
........................................ .
Wing
Pivot Assembly .............................................. .
Electrostatic Discharge Bracket Details
................................ .
Cabling for a Two-Drive
System ..................................... .
Cabling for a Three- and Four-Drive System
........................... .
Connecting
SOl Cable Shield Terminators ............................. .
Mounting the
I/O Bulkhead Assembly ................................. .
Drive Sequence Cable Installation
.................................... .
Power Controller AC Receptacles .................................... .
Connecting Cable Clamps to Uprights
................................. .
Cable Routing and Clamping
........................................ .
Diagnostic Terminal Connections
..................................... .
Front-Panel Controls and Indicators
................................... .
Cam-Coded Swlich Cover ........................................... .
Air Filter Removal ................................................. .
Field Service Diagnostic Terminal
.................................... .
Related Documentation
............................................. .
RA81 Specifications
............................................... .
RA81 Options
.................................................... .
Indicator Conditions
............................................... .
Drive Front-Panel Fault Identification Codes ............................ .
v
Page
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
1-8
1-9
1-13
3-2
3-3

1.1 PURPOSE AND SCOPE
CHAPTER 1
INTRODUCTION
This manual describes the RA81 Disk Drive and tells how to install, checkout, and operate the equipment.
This manual
is written primarily for the RA81 user except for Chapter 2 which is only for qualified field
service personnel.
1.2 GENERAL INFORMATION
The RA81 is a random-access, moving-head disk drive with non-removable media using a head/disk as-
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 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
• 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 of
backup should be used to prevent loss of data in the
event
of a failure. The following methods are recom-
mended.
File Duplication-Important files should be dupli-
cated 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 al-
lows reconstruction
of files up to the last checkpoint
or backup.
1.3 DRIVE DESCRIPTION
The RA81
is a self-contained disk drive with a built-in cooling system and dc power supply. See Figure 1-1.
The drive has optional slide rails and is designed to be inserted into a 19-inch wide RETMA equipment
rack. Up to three drives (one fixed mounted and two mounted
on slides) can be included in a single cabinet.
An RA81 Disk Drive subsystem
is made up of an SDI controller (two controllers with the dual-port con-
figuration) and one or more disk drives. Figure
1-2 shows the relationship between the subsystem compo-
nents.
All RA81 disk logic
is included within the drive. Three of the primary circuit modules (servo, microproces-
sor, and personality) are located directly under the logic access cover on top of the cabinet. These three
modules are mounted
on hinges for ease of service. See Figure 1-3.
DC operating power for the logic circuits is provided by the drive power supply located inside the back of
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 on the disk
at the time the
HDA
is manufactured.
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
on the operator control panel. The second set of diag-
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
is located on the mi-
croprocessor module and the slave
is located on the servo module. One microprocessor handles real-time
functions, such
as servo control, while the other controls status checking. Both microprocessors share the
diagnostic responsibilities.
1-2

CZ-0775
Figure 1·1 The RA81 Disk Drive

TO/ FROM
CPU
SDI
CONTROLLER SDI CABLES
Figure 1-2. Basic RA81 Disk-Subsystem Block Diagram
1-4
DRIVE
o
r------,
DRIVE :
I 1 I
L ____ ---J
r----.
I DRIVE I
2 I
L ____ -.1
r------,
I DRIVE I
3 I
L ____ -1
ADDITIONAL
DRIVES
CZ-0730

1.1 PURPOSE AND SCOPE
CHAPTER 1
INTRODUCTION
This manual describes the RA81 Disk Drive and tells how to install, checkout, and operate the equipment.
This manual
is written primarily for the RA81 user except for Chapter 2 which is only for qualified field
service personnel.
1.2 GENERAL INFORMATION
The RA81 is a random-access, moving-head disk drive with non-removable media using a head/disk as-
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
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
• 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
I-I

NOTE
Like other fixed-media devices, some method
of
backup should be used to prevent loss of data in the
event
of a failure. The following methods are recom-
mended.
File Duplication-Important files should
be dupli-
cated 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 al-
lows reconstruction
of files up to the last checkpoint
or backup.
1.3 DRIVE DESCRIPTION
The RA81
is a self-contained disk drive with a built-in cooling system and dc power supply. See Figure I-I.
The drive has optional slide rails and is designed to be inserted into a 19-inch wide RETMA equipment
rack. Up to three drives (one fixed mounted and two mounted on slides) can be included
in a single cabinet.
An RA81 Disk Drive subsystem
is made up of an SDI controller (two controllers with the dual-port con-
figuration) and one or more disk drives. Figure
1-2 shows the relationship between the subsystem compo-
nents.
All RA81 disk logic
is included within the drive. Three of the primary circuit modules (servo, microproces-
sor, and personality) are located directly under the logic access cover
on top of the cabinet. These three
modules are mounted
on hinges for ease of service. See Figure 1-3.
DC operating power for the logic circuits is provided by the drive power supply located inside the back of
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
on the disk at the time the
HDA
is manufactured.
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
on the operator control panel. The second set of diag-
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 niaster
is 'located on the mi-
croprocessor module and the slave
is located on the servo module. One microprocessor handles real-time
functions, such
as servo control, while the other controls status checking; Both microprocessors share the
diagnostic responsibilities.
1-2

I
" IIliiiIiIIiIiii.UHlliUiIIIlifiiRiUliilM9f1 .1. !
~ ........ uHdinii
Figure 1-1 The RA81 Disk Drive
1-3
CZ-0775

TO/ FROM
CPU
SDI
CONTROLLER SDI CABLES
Figure 1-2. Basic RA81 Disk-Subsystem Block Diagram
1-4
DRIVE
o
,------,
DRIVE I
I 1 I
L ____ ---J
r-----,
I DRIVE I
2 I
L ____ --1
,----,
I DRIVE I
3 I
L ____ --1
ADDITIONAL
DRIVES
CZ-0730

1.5 RA81 SPECIFICATIONS
Table 1-2 gives the primary performance, power, environmental, and physical characteristics of the RA81
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 that must not
be exceeded when the drive is being stored
or in a
non-operating condition. Exceeding these values can
damage the drive when power is applied. Adhering to
these values ensures
that the drive operates correctly
when power is applied.
Table 1-2 RA81 Specifications
Characteristic
Data storage capacity
(Single drive)
16-bit word format
Media type
Head disk assembly(HDA)
Number of disks
Disk surfaces
Number of heads (groups)
Heads per disk surface
Cylinders per head
Sectors per track
16-bit word format
Servo system
Performance characteristics
Disk encoding method
Linear bit density
Bytes per
track (unformatted)
Transfer rate
Bit cell period
Read initialization time
Write-to-read recovery
1-9
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-
cluding
data separator
sync)

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/stop times
Start time
Stop time
Maximum
start/stop frequency
Physical characteristics
(Drive only)
Width (nominal)
Depth (nominal)
Height (nominal)
Weight (approx.)
Environmental limits
Temperature
Operating
Non-operating
Relative humidity
Operating
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)
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 20 degrees
C/hour
(36 degrees F /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-operating
and shipping
Power
Voltage requirements
(Single phase)
120 volt, 60 Hz drives
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
I-I I
Specification
10% to 85% with no
condensation
644 watts (nominal)
Sea level to 2400 meters
(8000 feet) above sea level.
Note: Maximum allowable temp-
eratures are reduced by a
factor of 1.8 degrees
C/1000
meters (1 degree F/1000 feet)
for operation
at 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)
90-128 volts ac, 60 plus
or minus 1
Hz
184-256 volts ac, 50 plus
or minus 1
Hz
35 ampere peak surge for
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

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
240 volts, 50Hz
1.6 RA81 OPTIONS
Table 1-3 lists the RA81 options.
Specification
644 watts at 120 volts
4320 watts at 240 volts
496 watts
at 240 volts
0.9
259 cm (8.5 feet)
Hubbe1 No.2611
NEMA No.L5-30P
DEC No.12-11193
(See Figure 2-1)
Hubbel No.2321
NEMA No.L6-20P
DEC No.12-11192
(See Figure
2-1
All RA81 options in Table 1-3 include a 12-foot, shielded, inter-cabinet cable. If a longer cable is required
because of the dual-access feature, order cable BC06V-12 (12 feet), BC06V-25 (25 feet), BC06V-50 (50
feet),or BC06V-80 (80 feet).
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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 VAC, 60 Hz, no cabinet
456 MB drive,240 VAC, 50
HZ,no cabinet
RA81-AA, H9642-AP cabinet, 60
Hz
RA81-AD, H9642-AR cabinet, 50 Hz
(3) RA81-AA, H9642-AP cabinet, 60 Hz
(3) RA81-AD, H9642-AR cabinet, 50 Hz
RA81-AA, UDA50, no cabinet
RA81-AD, UDA50, no cabinet
RA81-CA, UDA50, cabinet
RA81-CD, UDA50, cabinet
RA81-EA, UDA50, cabinet
RA81-ED, UDA50, cabinet
RA81-CA, (2) UDA50, cabinet
RA81-CD, (2) UDA50, cabinet
1-13