IBM 4002-Y2A, Installation And User Manual

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Table 15. Switch status for two installed power supply units (continued)
State LED PSU1 PSU2 Switch Status Redundancy
All `AC OK'
LEDs off AC OK Off Off Power off or
failure No
DC OK Off Off
Power supplies
The y-series switches have two power receptacles on the rear panel. Each device
ships with one power supply unit (PSU) installed. The 4002-Y2A, Y4A, Y2C, and
Y4C devices use a 210W PSU. The 4002-Y2B and 4002-Y4B devices use a 620W
PSU.
Note: The 4002-Y2A and 4002-Y4A power supplies have an arrow with an "E" to
indicate airflow from port side to non-port side (front to back). The
4002-Y2C and 4002-Y4C power supplies have an arrow with an "I" to
indicate airflow from non-port side to port side (back to front). These power
supplies must be matched with fan trays that also have the same
corresponding "E" and "I" arrows on them (see Table 2 on page 3).
Each power supply has one standard (IEC-C14 inlet) power receptacle for the AC
power cable, and AC and DC status LEDs for easy monitoring and
troubleshooting.
A secondary power supply can be installed to provide backup power in case of a
failure and for load-balancing when both power suppies are operational.
Load-balancing gives the power supplies a longer life span. Both 210W and 620W
PSUs are hot-swappable.
For instructions on installing and replacing a power supply refer to “Installing or
replacing a power supply unit” on page 23. For information on LED status refer to
Table 10 on page 10.
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AC power receptacle
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Figure 16. 4002-Y2B and 4002-Y4B AC power supply receptacle
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Figure 17. 4002-Y2A, Y4A, Y2C, and Y4C AC power supply receptacle
Chapter 1. Product overview
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