C H A P T E R 5 - Power Source Requirements and Connections

C H A P T E R 5

Power Source Requirements and Connections

This chapter describes the power source requirements for the Netra 240 server and how to assemble and connect the power cables. This chapter contains the following sections:

Operating Power Limits and Ranges

DC Source Site Requirements

Assembling and Connecting the DC Input Power Cable

Connecting the AC Power Cables

Note - If you are installing a DC-powered version of the Netra 240 server, go to DC Source Site Requirements and Assembling and Connecting the DC Input Power Cable for instructions. For instructions for the
AC-powered server, see Connecting the AC Power Cables.

Operating Power Limits and Ranges

TABLE 5-1 gives operating power limits for the DC version of the Netra 240 server, and TABLE 5-2 provides the limits for the AC version of the server.

TABLE 5-1 DC Operating Power Limits and Ranges
Description	Limit or Range
Operating Input Voltage Range	-40 VDC to -75 VDC
Maximum Operating Input Current	Less than 15 A
Maximum Operating Input Power	570 W

TABLE 5-2 AC Operating Power Limits and Ranges
Description	Limit or Range
Operating Input Voltage Range	90 - 264 VAC
Operating Frequency Range	47 - 63 Hz
Maximum Operating Input Current	6.1 A @ 90 VAC
Maximum Operating Input Power	550 W

Note - The figures for the maximum operating current are provided to help you specify the fusing and cabling you need to deliver power to your equipment. However, these figures represent worst-case scenarios.

Estimated Power Consumption

TABLE 5-3 shows the estimated power consumed in a fully populated, DC-powered Netra 240 server. TABLE 5-4 shows the estimated power consumed in a AC-powered server.

TABLE 5-3 DC Server Power Consumption
Configuration	Maximum Input Power
2 x 1280 MHz CPU 8 x 1 GB DIMMs 2 x 73 GB HD (with a DVD-ROM, hardware cryptographic module, and three PCI cards)	364 W
2 x 1280 MHz CPU 8 x 512 MB DIMMs 2 x 73 GB HD (with a DVD-ROM, hardware cryptographic module, and three PCI cards)	356 W

TABLE 5-4 AC Server Power Consumption
Configuration	Maximum Input Power
2 x 1280 MHz CPU 8 x 1 GB DIMMs 2 x 73 GB HD (with a DVD-ROM, hardware cryptographic module, and three PCI cards)	353 W
2 x 1280 MHz CPU 8 x 512 MB DIMMs 2 x 73 GB HD (with a DVD-ROM, hardware cryptographic module, and three PCI cards)	345 W

Note - The maximum input power values shown in TABLE 5-4 are based on AC power supply efficiency.

Note - For more information about server configurations, and to see a list of optional components, refer to the SunStore web site (http://store.sun.com).

DC Source Site Requirements

Details of the power source requirements for the Netra 240 server are provided in this section.

TABLE 5-5 DC Power Requirements
Electrical Element	Requirement
Voltage (nominal)	-48 VDC, -60 VDC
Input current (maximum)	14 A
Max. input surge current	17 A

Reliably connected to protected earth ground

May be supplied by one or two power sources, isolated from each other

Capable of providing up to 600 W of continuous power per feed

Limited to TNV-2 as defined by UL 60950 and IEC 60950

Note - The DC server must be installed in a restricted-access location. According to the National Electrical Code, a restricted-access location is an area intended for qualified or trained personnel only and has access controlled by a locking mechanism, such as a key lock or an access card system.

DC Supply and Ground Conductor Requirements

Suitable conductor material: use copper conductors only

Power supply connections through the input connector: 12 AWG (between the Netra 240 server and the source). There are three conductors:

-48V (negative terminal)

Chassis ground connection

-48V Return (positive terminal)

System ground conductor: 12 AWG (to be connected to the chassis)

Cable insulation rating: Minimum of 75°C (167°F), low smoke fume (LSF), flame retardant

Cable type one of the following:

UL style 1028 or other UL 1581 (VW-1) compliant equivalent

IEEE 383 compliant

IEEE 1202-1991 compliant

Branch circuit cable insulation color: Per applicable National Electrical Codes

Grounding cable insulation color: Green/yellow

Note - Depending on the DC power source, the -48V (negative terminal) might be marked with a minus (-) symbol, and the -48V Return (positive terminal) might be marked with a positive (+) symbol.

Overcurrent Protection Requirements

Overcurrent protection devices must be provided as part of each equipment rack.

Circuit breakers must be located between the DC power source and the Netra 240 server. Use one 20 A double-pole, fast trip DC-rated circuit breaker for each power supply unit.

Note - Overcurrent protection devices must meet applicable national and local electrical safety codes and be approved for the intended application.

Assembling and Connecting the DC Input Power Cable

This section describes how to assemble and connect the DC input power cable and the location of the I/O ports at the rear of the servers.

Note - This section describes how to assemble and connect the DC power cables to a DC-powered Netra 240 server. For AC-powered server instructions, see Connecting the AC Power Cables.

Assembling the DC Input Power Cable

Note - If you have already assembled the DC input power cables, skip to Connecting the DC Input Power Cable to the Server.

1. Identify the parts that you will use to assemble the DC input power cable (FIGURE 5-1).

The following DC connection parts are required to assemble one or more DC power input cables. These cables connect the -48V DC input source(s) to the power supply units.

DC input plugs

Strain relief housings

Cage clamp operating lever

Tie wraps

FIGURE 5-1 DC Connection Parts

Figure showing the DC input plug, cage clamp operating lever, and strain relief housing.

2. Turn off power from the DC power source through the circuit breakers.

Caution - Do not proceed with these instructions until you have turned off the power from the DC power source through the circuit breakers.

3. Get a DC input plug from the ship kit.

4. Locate the three wires coming from the DC power source that will be used in the connection to your unit:

-48V (negative terminal)

Chassis ground

-48V Return (positive terminal)

Note - Depending on the DC power source, the -48V (negative terminal) might be marked with a minus (-) symbol, and the -48V Return (positive terminal) might be marked with a positive (+) symbol.

5. Strip 5/16 inches (8 mm) of insulation from each of the wires coming from the DC power source.

Do not strip more than 5/16 inches (8 mm) from each wire. Doing so leaves uninsulated wire exposed from the DC connector after the assembly is complete.

FIGURE 5-2 Stripping the Insulation From the Wire

Figure showing the amount of insulation to strip from the wire (5/16 inches).

6. Open the cage clamp for this section of the DC input plug by taking one of the following actions:

Insert the tip of the cage clamp operating lever into the rectangular hole directly above the hole in the DC input plug where you want to insert the first wire. Press down on the cage clamp operating lever (FIGURE 5-3).

Insert a small slotted screwdriver into the rectangular hole directly above the hole in the DC input plug where you want to insert the first wire, and press down on the screwdriver (FIGURE 5-4).

FIGURE 5-3 Opening the DC Input Plug Cage Clamp Using the Cage Clamp Operating Lever

Figure showing how to open the DC input plug cage clamp using the cage clamp operating lever.

FIGURE 5-4 Opening the Cage Clamp Using a Screwdriver

Figure showing how to open the cage clamp using a screwdriver.

7. Feed the exposed section of the appropriate wire into the rectangular plug hole in the DC input plug.

FIGURE 5-5 shows which wires should be inserted into each hole in the DC input plug.

FIGURE 5-5 Assembling the DC Input Power Cable

Figure showing how to assemble the DC input power cable.

8. Repeat Step 6 and Step 7 for the other two wires to complete the assembly of the DC input power cable.

9. Repeat Step 4 through Step 8 to create as many DC input power cables as you need for your unit.

You need one DC input power cable for each of the two power supplies.

If you need to remove a wire from the DC input plug, insert the cage clamp operating lever or a small screwdriver into the slot directly above the wire and press down (FIGURE 5-3 and FIGURE 5-4). Pull the wire from the DC input plug.

Installing the Strain Relief Housings

1. Insert the bottom portion of the strain relief housing into the notch on the DC input plug until it snaps into place.

Ensure that the strain relief housing snaps into place on the DC input plug. You cannot complete the assembly correctly if the strain relief housing is not snapped into place.

FIGURE 5-6 Inserting the Bottom Portion of the Strain Relief Housing

Figure showing how to insert the bottom portion of the strain relief housing.

2. Route the three wires coming from the DC power source through the opening at the end of the bottom portion of the strain relief housing (FIGURE 5-7).

FIGURE 5-7 Routing the Wires out of the Bottom Portion of the Strain Relief Housing

Figure showing how to route the wires out of the bottom portion of the strain relief housing.

3. Insert a tie wrap into the bottom portion of the strain relief housing.

FIGURE 5-8 Securing the Wires to the Strain Relief Housing

Figure showing how to secure the wires to the strain relief housing.

4. Loop the tie wrap over the wires and back out of the strain relief housing, and tightening the tie wrap to secure the wires to the strain relief housing (FIGURE 5-8).

5. Lower the top portion of the strain relief housing so that the three prongs on the top portion insert into the openings in the DC input plug.

Push the top and bottom portions of the strain relief housing together until they snap into place.

FIGURE 5-9 Assembling the Strain Relief Housing

Figure showing how to assemble the strain relief housing.

Connecting the DC Input Power Cable to the Server

Caution - An energy hazard is present when energized units are not properly earthed.

1. Locate the DC connectors at the rear of the server.

FIGURE 5-10 DC Connector Locations

Figure showing the location of the DC connectors for the front-access model of the Netra CT chassis.

2. Connect the DC input power cables to the DC connectors.

FIGURE 5-11 Connecting the DC Input Power Cable to the DC Connectors

Figure showing how to connect the DC input power cable to the DC connectors.

3. Turn on the circuit breakers to provide power to the servers.

If you want to disconnect the DC input power cable from the DC connector at some point in the future, turn the circuit breakers off, then squeeze the two tabs on the sides of the DC input power cable and gently disconnect the DC input power cable from the DC power supply.

Caution - Do not attempt to disconnect the DC input power cable from the DC connector until you have turned off the power from the DC power source through the circuit breakers.

FIGURE 5-12 Disconnecting the DC Input Power Cable From the DC Connector

Figure showing how to disconnect the DC input power cable from the DC connectors.

Connecting the AC Power Cables

Note - This section describes how to connect AC power cords to an AC-powered Netra 240 server. For DC-powered server instructions, see Assembling and Connecting the DC Input Power Cable.

The two AC power supply units in the Netra 240 server allow for 1 + 1 power redundancy. If one power supply unit fails, then the system will continue to operate using the remaining power supply unit. Additionally, to ensure true AC line input redundancy for the server, you should connect each AC power cable to a different AC power source. You can also connect an uninterruptible power supply (UPS) between each AC power source and the server to increase the availability of the server.

Note - The Netra 240 server uses nominal input voltages from 100 VAC to 240 VAC. Sun products are designed to work with power systems having a grounded neutral conductor. To reduce the risk of electrical shock, do not plug Sun products into another type of power source. Contact your facilities manager or a qualified electrician if you are unsure what type of power is supplied to your building.

1. Get the supplied AC power cords from the server's shipment kit.

2. Connect one end of each AC power cord into the AC power inlet connectors located at the rear of the server.

See FIGURE 5-13 for the location of the AC power inlet connectors.

FIGURE 5-13 Connecting the AC Power Cords to the AC Power Inlet Connectors

3. Connect the other ends of the power cords into AC wall outlets.

Connect each AC power cord to a different AC power source if you want AC line input power redundancy.