Cisco UCS C240 M3 NEBS Server Service Note

NEBS Compliance

The Cisco UCS C240 M3 NEBS Server has been certified for the following levels of NEBS compliance:

• The DC-power version of the server is certified for NEBS Level 3 compliance.
• The AC-power version of the server is certified for NEBS Level 1 compliance.

Power Supplies

The Cisco UCS C240 M3 NEBS server can use either AC or DC power supplies.

650 W AC Power Supply

The NEBS server can use one or two 650 W AC power supplies (Cisco PID UCSC-PSU-650W).

• The server is certified for NEBS Level 1 compliance when using these AC power supplies.
• These power supplies are hot-swappable with 1+1 redundancy when two power supplies are present.
• See Power Supply Specifications, for information about these power supplies.
• See the Cisco UCS C240 Server Installation and Service Guide, Chapter 3, for information about replacing a power supply.

930 W DC Power Supply

The NEBS server can use one or two 930 W, –48 VDC power supplies (Cisco PID UCSC-PSU-930WDC).

• The server is certified for NEBS Level 3 compliance when using these DC power supplies.
• These power supplies are hot-swappable with 1+1 redundancy when two power supplies are present.
• See Power Supply Specifications, for information about these power supplies.
• See the Cisco UCS C240 Server Installation and Service Guide, Chapter 3, for information about replacing a power supply.

Installation Grounding Requirement (DC Power Supplies Only)

The 650 W AC power supplies have internal grounding and so no additional grounding is required when the supported AC power cords are used.

When using the DC power supply, additional grounding of the server chassis to the earth ground of the rack is required. Screw holes for use with your grounding lugs and grounding wires are supplied on the chassis rear panel.

Note The grounding points on the chassis are sized for M5 screws. The grounding points are spaced at 0.625 inches (15.86 mm). You must provide your own screws, grounding lug, and grounding wire. The grounding lug required is a Panduit LCD10-14AF-L or equivalent. The grounding cable that you provide must be 14 AWG (2 mm), minimum 60° C wire, or as permitted by the local code.

See Figure 1-1 for the location of the grounding lug screw-holes on the chassis rear panel.

Figure 1-1 Cisco UCS C240 M3 NEBS Server Rear Panel (DC Power Supply Version)

Wiring a DC Power Supply

Warning A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. Statement 1022

Warning This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation. Install only in accordance with national and local wiring regulations. Statement 1045

Warning When installing or replacing the unit, the ground connection must always be made first and disconnected last. Statement 1046

Warning Installation of the equipment must comply with local and national electrical codes. Statement 1074

Warning Hazardous voltage or energy may be present on DC power terminals. Always replace cover when terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1075

Note The recommended wire gauge is 8 AWG. The minimum wire gauge is 10 AWG.

Use the following procedure to connect wires to the DC power supply connector:

Caution Before beginning this wiring procedure, turn off the DC power source from your facility’s circuit breaker to avoid electric shock hazard.

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Step 1 Turn off the DC power source from your facility’s circuit breaker to avoid electric shock hazard.

Step 2 Remove the DC power connector block from the power supply. (The spare PID for this connector is UCSC-CONN-930WDC=.)

To release the connector block from the power supply, push the orange plastic button on the top of the connector inward toward the power supply and pull the connector block out.

Step 3 Strip 15mm (.59 inches) of insulation off the DC wires that you will use.

Step 4 Orient the connector as shown in Figure 1-2, with the orange plastic button toward the top.

Step 5 Use a small screwdriver to depress the spring-loaded wire retainer lever on the lower spring-cage wire connector. Insert your green (ground) wire into the aperture and then release the lever.

Step 6 Use a small screwdriver to depress the wire retainer lever on the middle spring-cage wire connector. Insert your black (DC negative) wire into the aperture and then release the lever.

Step 7 Use a small screwdriver to depress the wire retainer lever on the upper spring-cage wire connector. Insert your red (DC positive) wire into the aperture and then release the lever.

Step 8 Insert the connector block back into the power supply. Make sure that your red (DC positive) wire aligns with the power supply label, “+ DC”.

Figure 1-2 930 W, –48 VDC Power Supply Connector Block

Drive Support

The NEBS server uses the small form-factor, 24-drive backplane with expander. However, the maximum number of drives supported is 16. The drives should be populated in drive bays 1—16.

• See Figure 1-3 for the drive-bay numbering.
• See the Cisco UCS C240 Server Installation and Service Guide, Chapter 3, for information about replacing a drive.
• See the Cisco UCS C240 Server Installation and Service Guide, Appendix C, for information about supported RAID controllers and cabling.

Figure 1-3 Cisco UCS C240 NEBS Server (Drive Bays 1—16)

DIMMs

The NEBS server supports a maximum DIMM size of 16 GB (32-GB DIMMs are not supported).

Load-reduce DIMMs (LRDIMMs) are not supported.

See the Cisco UCS C240 Server Installation and Service Guide, Chapter 3, for information about populating and replacing DIMMs.

CPUs

The NEBS server supports only two types of CPU: Intel Xeon E5-2620 and E5-2658.

See the Cisco UCS C240 Server Installation and Service Guide, Chapter 3, for information about populating and replacing CPUs.

Power Supply LEDs (AC and DC)

Figure 1-4 shows the rear of the 930 W DC power supply, but the LEDs and their states are the same for the 650 W AC power supply. See Table 1-1 for an explanation of the LED states.

Figure 1-4 930 W, –48 VDC Power Supply (Rear View)

650 W AC Power Supply Specifications

Table 1-2 lists the specifications for each 650 W AC power supply (Cisco PID UCSC-PSU-650W).

930W DC Power Supply Specifications

Table 1-3 lists the specifications for each 930 W DC power supply (Cisco PID UCSC-PSU-930WDC).

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