SGI Origin 3900 Specifications Page 20
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6 007-4603-001
2: Site Preparation Concepts
Voltage Requirements
SGI Origin 3900 servers ship with the option of either single-phase or three-phase input
power. Refer to the section titled “System Power Requirements” in Chapter 6 for the
voltage requirements of the chassis. You must ensure that your account manager knows
of your needs before the system is ordered.
Ensure that the required voltage is available and is within a reasonable distance of the
intended location. If it is not, the site must be wired for the required voltage.
Power Requirements
Even one SGI Origin 3900 server rack can require more power than is routinely available
in an office environment. A room full of racks will almost certainly require some
specially installed electrical circuits. Refer to the section titled “System Power
Requirements” in Chapter 6 for the power requirements of the rack in question.
Note: The wattages listed in this guide are the system maximums. While most systems
never draw the maximum rated wattage, SGI recommends that you install wiring that is
capable of supporting the system’s maximum potential wattage.
Power is measured in voltamperes (VA) and watts. Both measurements are important
when you prepare to install wiring, power conditioning, and cooling.
A VA rating is a function of the voltage and amperage of a system. A watt rating is the
VA rating multiplied by its power factor (refer to the section titled “Power Factor” on
page 7). You can convert among amps, volts, VA, power factor, and watts by using the
following formulas:
Use this information and the information provided in Table 6-2 to determine the site
power requirements.
If, after you add up the power requirements of all the devices in the room, you find that
the total is close to the limit that the existing wiring can support, you should install
additional power circuits to support the systems.
Watts
Volts Power Factor
.
Amps =
Watts = (VA Power Factor)
VA = (Amps Volts)
.
VA =
Watts
Power Factor
.
Watts = (VA Power Factor)
Watts
Volts Power Factor 1.73
VA = (Amps Volts 1.73)
.
VA =
Watts
Power Factor
Amps =
.
..
Single Phase Three Phase
.
- 3900 Server 1
- Site Planning Guide 1
- Record of Revision 3
- Contents 5
- About This Guide 11
- Audience for This Guide 12
- Obtaining Publications 13
- Reader Comments 13
- 1. Overview 15
- 2. Site Preparation Concepts 17
- Selecting a Final Location 18
- Electrical Requirements 19
- Voltage Requirements 20
- Power Requirements 20
- Grounding Requirements 21
- Power Factor 21
- Inrush Current 21
- Power-line Treatment 22
- Total Harmonic Distortion 22
- Thermal Requirements 23
- Calculating Thermal Load 24
- Thermal Gradient 24
- Environmental Requirements 25
- Electrostatic Discharge 26
- Vibration 26
- Humidity 26
- Humidity Gradient 26
- Ergonomic Requirements 27
- Local Regulations 27
- Planning for the Future 27
- Configurations, and Components 29
- 16 007-4603-001 30
- SGI Origin 3900 Server Bricks 31
- 18 007-4603-001 32
- System Control 33
- 007-4603-001 21 35
- 22 007-4603-001 36
- 007-4603-001 23 37
- 007-4603-001 25 39
- Characteristic Specification 40
- 007-4603-001 27 41
- 6. Site Requirements 43
- 30 007-4603-001 44
- 6: Site Requirements 44
- System Power Requirements 46
- Remote Support 48
- Network Connections 48
- Raised-floor Installations 49
- 36 007-4603-001 50
- Raised-floor Installations 51
- 007-4603-001 37 51
- Pad Locations 51
- 7. Securing the Cabinets 53
- 8. Site Planning Checklist 55
- 9. Summary 57
- Conversion 59
- B. Regulatory Specifications 61
- Electromagnetic Emissions 62
- Shielded Cables 63
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