Dual "facilities power distribution" installation

Dual "facilities power distribution" installation - PDU power

The 3931 is designed with a fully redundant PDU power system. Each computer has 2, 4, 6, or 8 line cords attached to 2, 4, 6, or 8 power input feeds which, in turn, power a fully redundant power sub-system within the computer. The system line cords should be connected to the installation site's distribution panels accordingly, to ensure system availability is optimized.

The minimum recommended redundant connection requires the line cords from odd numbered PDU's (such as PDU-A1 and PDU-A3), to be attached to a customer distribution power panel(s) that is independent of the customer distribution power panel(s) to which the line cords from even numbered PDU's (such as PDU-A2 and PDU-A4), are attached. This method of connection can prevent a system outage from occurring, caused by the loss of a power distribution panel or the tripping of an upstream breaker that is powering that distribution panel. Additional redundancy, such as independent switchgear, feed transformers, or power substations, can further improve the system's immunity to power outages.

The following figures show the recommended PDU power connections for 3931.

Attention: Note that the line cords can exit the system from the top or bottom; top exit cabling is shown for illustrative purposes only.

Figure 1. A frame - PDU
This graphic shows the recommended PDU power connections for 3931, single A frame
Figure 2. A and Z frames - PDU
This graphic shows the recommended PDU power connections for 3931, A and Z frames
Figure 3. B and A frames - PDU
This graphic shows the recommended PDU power connections for 3931, A and B frames
Figure 4. C, A, and Z frames - PDU
This graphic shows the recommended PDU power connections for 3931, C, A and Z frames
Figure 5. B, A, and Z frames - PDU
This graphic shows the recommended PDU power connections for 3931, B, A and Z frames
Figure 6. C, B, A, and Z frames - PDU
This graphic shows the recommended PDU power connections for 3931, C, B, A and Z frames

Example (incorrect and correct PDU power connections)

This graphic provides an example of the incorrect and correct PDU power connections for 3931

Dual "facilities power distribution" installation - BPA power

The 3931 is designed to support a fully redundant 2N BPA power system. Each computer has either 2 or 4 line cords attached to 2 or 4 power input feeds which, in turn, power a pair of fully redundant bulk power assemblies within the computer. The system line cords should be connected to the installation site's distribution panels accordingly, to ensure system availability is optimized.

Note: The maximum number of power cords that are supported for the BPA feature is 4; two line cords for BPA in A frame, two line cords for BPA in B or C frame.

The minimum recommended redundant connection requires the line cord pair in a given frame to attach to separate power distribution panels. This method of connection can prevent a system outage from occurring, caused by the loss of a power distribution panel or the tripping of an upstream breaker that is powering that distribution panel. Additional redundancy, such as independent switchgear, feed transformers, or power substations, can further improve the system's resistance to power outages.

The following figures show the recommended BPA power connections for 3931.

Attention: Note that the line cords can exit the system from the top or bottom; top exit cabling is shown for illustrative purposes only.

Figure 7. A frame - BPA
This graphic shows the recommended BPA power connections for 3931, single A frame
Figure 8. A and Z frames - BPA
This graphic shows the recommended BPA power connections for 3931, A and Z frames
Figure 9. B and A frames - BPA
This graphic shows the recommended BPA power connections for 3931, A and B frames
Figure 10. C, A, and Z frames - BPA
This graphic shows the recommended BPA power connections for 3931, C, A and Z frames
Figure 11. B, A, and Z frames - BPA
This graphic shows the recommended BPA power connections for 3931, B, A and Z frames
Figure 12. C, B, A, and Z frames - BPA
This graphic shows the recommended BPA power connections for 3931, C, B, A and Z frames

Example (incorrect and correct BPA power connections)

This graphic provides an example of the incorrect and correct BPA power connections for 3931