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v You cannot mix HVAC/HVDC and standard voltage AC power supplies in the same chassis. All
power supplies must be the same type.
v All HVAC/HVDC power supplies installed in the device must be all either NPI or NPE models. The
airflow direction must match airflow direction of installed fans.
The following figure illustrates power supply assembly components.
Figure 68. HVAC/HVDC power supply assembly
1. Fan 1
2. Fan 2
3. Handle
4. Status LED
5. HVAC/HVDC power cable receptacle
6. Airflow label
7. Captive screw
8. Power cable restraint cover
Consider the following information when connecting AC power:
v
The SAN256B-6 Director has two power supplies installed. Use of the high-voltage line (200 to 277
VAC) is highly recommended because of better power conversion efficiency. Refer to "Power Supply
Requirements" in Appendix B, "Product Specifications," on page 231 for minimum power supplies
required for AC low and high voltage line operation, redundancy in case of power supply failure, and
other specifications.
v Redundant AC primary power connections ensure high availability. Each power supply has its own
connector, so two primary power connections are required for the SAN256B-6 Director for optimum
efficiency and redundancy.
Power supplies can be removed and replaced without special tools. If you are replacing one power
supply in a configuration with N+1 or greater redundancy, the director can continue operating during the
replacement if procedures in this guide are followed. Otherwise, installed blades may power off. Refer to
"Power supply requirements" inAppendix B, "Product Specifications," on page 231 for more information
about power supply redundancy.
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SAN256B-6 Installation, Service, and User Guide
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