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9-6 Ultra Enterprise 6000/5000/4000 Systems Manual—November 1996
9
When the yellow LED is lit, a fan or a DC output has malfunctioned. Each
modular power supply contains two fans and three DC supplies (+3.3 VDC, +5
VDC, and +2 VDC).
The green LED indicates that the DC supplies are operating, but does not
guarantee that the DC outputs are within specification.
The PCMs operate in redundant current share mode. If a module fails, the
remaining modules may or may not provide enough current to continue
system operation. The system’s ability to continue operations depends on the
total demand for current.
9.2.6 Disk Tray Indicators
The availability and type of status information varies with the disk tray type
used in a system. Refer to the disk tray user manual for specific status
information.
Table 9-3 Modular Power Supply LED Codes
Green Yellow Condition
Off Off No AC input or keyswitch is turned off.
On Off Normal operation.
On On A fan has failed or one or more voltages are out of
specification.
Off On One or more DC outputs have failed, or the voltages are out of
specification, or the system is in the low power state.