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Appendix A
Power Supply
Power Supply
Load Considerations
BTU Calculations
Each Cubix MultiServ/FT Subsystem normally contains two power supplies. Each power supply must be capable of delivering the current needed to power all controller boards, fans, and disk drives (i.e., the total load) mounted in the MultiServ/FT Subsystem. With two supplies installed, each will normally carry approximately one-half of the total load.
Each supply is fan cooled. The fans and other subsystem electronics require 24 watts, leaving 356 watts available for controller boards, disk drives, CD ROM drive, tape drive, etc. When the power supply load is properly limited, and the inlet air temperature is maintained between 00C and 400C, the power supply will provide a long life of trouble-free service. Cubix RETMA cabinets are designed to provide an ample supply of air to the intake vents of the MultiServ/FT Subsystem.
* If the MultiServ/FT Subsystems are installed in a non-Cubix supplied RETMA enclosure, it is the responsibility of the end-user to ensure the subsystem inlet air does not exceed 40 degrees C. This is a critical requirement.
The MultiServ/FT Power Supply has four available voltage sources: +5 vdc, +12 vdc, -12 vdc, and -5 vdc. The subsystem provides the following power for each of these four voltage sources.
+5V@ 57A = 285 watts maximum
+12V @ 10A = 120 watts maximum (Peak)
+12V @ 4.5A = 54 watts maximum (Steady State)
-12V @ 1.2A = 14.4 watts maximum
-5V @ .5A = 2.5 watts maximum
Steady State Total Power Available = 356 watts maximum
Peak Total Power Available = 422 watts maximum
* Peak power is defined as the power required during the IDE hard disk drive ramp-up time. This time is normally 10 seconds or less.
The user must ensure that no single voltage source power rating exceeds the maximum listed in Table A - 1. In addition, these maximums are limited by the fact that no more than 356 watts total power may be drawn from all voltage sources combined. It is the responsibility of the user to verify that the sum of the power drain from the four sources does not exceed 356 watts.
The most straight forward method to determine if the power supply is capable of furnishing sufficient power is to add the power required for each load using the power requirements in Table A - 2 and Table A - 3 to calculate the total power.
Device Power
Requiremen
ts in
Watts
+5V +12V -12V
-5V
MP 2008 10.0 1.2 1.6 -----
QL 1044 12.0 1.0 0.6 -----
QL 2220 13.0 0.5 0.3 -----
QL 3001SX* 11.0 0.5 0.4 -----
QL 3002SX* 15.5 1.0 0.8 -----
QL 3002CX* 18.5 1.0 0.8 -----
QL 3222SX* 18.0 0.96 0.96 -----
QL 3222CX* 18.5 0.96 0.96 -----
QL4001DX/33 17.5 0.6 0.6 -----
QL4001SX/25 17.5 0.6 0.6 -----
QL4222DX/50 16.0 1.0 1.0 -----
BC3030SX/25* 13.0 0.6 0.6 -----
BC3035SX/33* 11.25 0.6 0.6 -----
BC4000DX/33 21.0 0.6 0.6 -----
BC4000DX/66 23.0 0.6 0.6 -----
BC4045DX/33 14.0 0.6 0.6 -----
BC4045DX/66 17.5 0.6 0.6 -----
BC4045DX/100 18.5 0.6 0.6 -----
BC4030DX/33 16.0 0.6 0.6 -----
BC4030DX/66 18.0 0.6 0.6 -----
BC4030SX/25 14.5 0.6 0.6 -----
BC4035SX/33 14.0 0.6 0.6 -----
BC4035DX/33 14.0 0.6 0.6 -----
BC4035DX/66 15.5 0.6 0.6 -----
BC 5055 30.9 0.6 0.6 -----
IES 3.0 0.12 0.006 0.0015
PA 3030 12.0 0.4 0.4 -----
* These power figures are with the math coprocessor
installed. Subtract 1.0 watt on
the +5 vdc if not installed.
Device Power
Requireme
nts in
Watts
+5V +12V
-12V -5V
Floppy Disk 4.0 ----- ----- -----
3.5" 60/100MB 2.0 13.0* ----- -----
IDE Hard Disk 4.0**
(Conner
CP30064/CP3010
4)
3.5" 500MB 2.0 36.0* ----- -----
IDE Hard Disk 9.0**
(Conner
CP3544)
3.5" 500MB 2.7 30.0* ----- -----
SCSI Hard 6.5**
Disk HH
(Seagate
ST1480N)
3.5" 2 4.0 26.4* ----- -----
Gigabyte SCSI 9.6**
Hard Disk
(Seagate
Barracuda)
2.5" 85MB IDE 4.5* ----- ----- -----
Hard disk 3.0**
(Seagate
ST9100)
EISA SCSI 10.0 ----- ----- -----
Controller
(Adaptec
2742)
Expansion 2.0 ----- ----- -----
Subsystem
Interface
Board
Host 1.7 ----- ----- -----
Expansion
Interface
Board
Fan ----- 10.0 ----- -----
Ethernet NIC 5.0 1.2 ----- -----
(SMC
EtherCard)
Token Ring 11.0 ----- ----- -----
NIC
(Madge Smart
AT Ringnode)
* Peak
** Steady State
CAUTION: DO NOT EXCEED THE MAXIMUM LOAD FOR ANY INDIVIDUAL VOLTAGE OR THE TOTAL LOAD. IF THAT CONDITION SHOULD OCCUR, THE POWER SUPPLY WILL SAFELY SHUT DOWN AND THE FAULT LIGHT WILL BE TURNED ON.
1. Add the total internal processor bay wattage.
2. Add to +24 watts consumed by the MultiServ/FT fans and electronics.
3. Multiply the calculated total watts load by 1.43 to account for power supply losses.
4. Multiply the new total watts by 3.4 to obtain the number of BTUs per hour.
An example is shown in Table A-4.
Typical
Power
Requirements
(Watts)
Device Type Qty +5V
+12V -12V -5V
BC 4035DX/33 2 28.0 1.2 1.2 -----
MP 2008 4 40.0 4.8 6.4 -----
Processor 68.0 6.0 7.6 -----
81.6
Bay Watts
BTU
Calculation ( ( 81.6 + 24 ) * 1.43 ) * 3.4 =
approx. 513 BTU / hour
This document, and all Web contents, Copyright © 1997
by Cubix Corp., Carson City, NV, USA.