Connecting to Power and Replacing Power Supply
This section lists the various warnings, cautions and notes regarding connecting to the power supply and replacing power supply units.
To reduce the risk of electric shock or energy hazards:
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This equipment must be installed by trained service personnel, as defined by the NEC and IEC 60950-1, Second Edition, the standard for Safety of Information Technology Equipment. |
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Connect the equipment to a reliably grounded Secondary circuit source. A Secondary circuit has no direct connection to a Primary circuit and derives its power from a transformer, converter, or equivalent isolation device. |
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The branch circuit overcurrent protection for DC power supply must be rated 27 A. |
If the DC connection exists between the earthed conductor of the DC supply circuit and the earthing conductor at the server equipment, the following conditions must be met:
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This equipment must be connected directly to the DC supply system earthing electrode conductor or to a bonding jumper from an earthing terminal bar or bus to which the DC supply system earthing electrode conductor is connected. |
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This equipment must be located in the same immediate area (such as adjacent cabinets) as any other equipment that has a connection between the earthed conductor of the same DC supply circuit and the earthing conductor, and also the point of earthing of the DC system. The DC system should be earthed elsewhere. |
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The DC supply source is to be located within the same premises as the equipment. |
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Switching or disconnecting devices must not be in the earthed circuit conductor between the DC source and the point of connection of the earthing electrode conductor. |
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Both Power Supply modules (1 and 2) must be connected. Ensure that you connect each one to a different AC power supply source. Two Power Supplies provide 1+1 power load-sharing and redundancy. The AC power sockets are located on the device's rear panel. |
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The two AC power sources must have the same ground potential. |
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The device must be connected (by service personnel) to a socket-outlet with a protective earthing connection. |
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Use only a certified 3-conductor power cord, supplied with the unit. |
To reduce the risk of personal injury from hot surfaces, allow the power supply or power supply blank to cool before touching it.
For DC power supply, use only the ring terminals provided with the power supply for customer-built power connections. Be sure no wire protrudes from the bottom of the ring terminal barrels.
Make sure that you connect the DC power feed cable to the power source in the correct polarity. The cable's two wires are color-coded and numbered to indicate polarity:
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Black Wire (1): negative (-) polarity |
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Red Wire (2): positive (+) polarity |
The device must be connected (by service personnel) to a socket-outlet with a protective earthing connection
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Before extracting the Power Supply module, disconnect the power cord from the module. |
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Before extracting the Power Supply module (after you have disconnected the power cord), wait at least three seconds for the capacitors to discharge. |
When connecting both Power Supply modules, the two AC power sources must have the same ground potential.
For DC power supply, the minimum nominal thread diameter of a pillar or stud type terminal must be 3.5 mm (0.138 in); the diameter of a screw type terminal must be 4.0 mm (0.157 in).
The DC power supply uses two power ring tongues and one ground ring tongue. They are not interchangeable