green power supply lights may then switch off to help indicate the source of the
trouble.
Note: The PSU1 fail light only works if the first power supply is plugged into the
matrix’s midplane from inside the matrix.
A temperature sensor inside the power supply senses if the power supply
overheats, and switches on the second matrix cooling fan. The red Temp light
switches on to indicate that the active CPU card, not a power supply, has
overheated.
5.7.4.5 PSU2 Fail
When the first power supply unit is operating correctly, the red PSU2 light
stays off, while the four green power supply lights (+12V, +5V, +3.3V, -12V)
stay on continuously.
If a DC output or AC input to the first power supply drops too low, the red PSU2
light switches on. The amber (XP) or red (Power-One) light on the power
supply unit itself also switches on to indicate the same condition. One of the
green power supply lights may then switch off to help indicate the source of the
trouble.
Note: The PSU2 fail light only works if the first power supply is plugged into the
matrix’s midplane from inside the matrix.
A temperature sensor inside the power supply senses if the power supply
overheats, and switches on the second matrix cooling fan. The red Temp light
switches on to indicate that the active CPU card, not a power supply, has
overheated.
5.7.4.6 Fan-On alarm light
Two fans deliver forced air cooling to the matrix’s power supplies. The primary
fan runs continuously. If a temperature exceeding a threshold is detected in a
power supply and extra cooling is required, a second fan switches on to increase
the air flow.
The fan-on alarm light illuminates red to indicate that the second fan is on.
5.7.5 Power supply lights
The green power-supply lights illuminate to indicate that the power supplies
are receiving +12 V, –12 V, +5 V, and 3.3 V power.
5.8 Connecting the matrix frame
Note: For detailed information about connecting the matrix to panels, interfaces and
other devices, see 4 Installing the Eclipse HX-Median
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