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6-5
Power Supply
The 7042P-8R has a triple redundant 500 watt redundant cooling power
supply that consists of three 250W power modules. All three modules
are active and share the load of the system (up to 500W max.). If any of
the three modules fail, the other two will continue to provide up to 500W
of power and allow the system to continue running without interruption.
The power supply modules have an auto-switching capability that enable
them to automatically sense and operate with either 100 or 240 volt
inputs. The power modules are PFC (Power Factor Correction) compliant.
Power Supply Failure
If any of the three power supply modules fail, an audible alarm will
activate to notify you of a power failure. Disable the alarm by pressing
the alarm reset switch on the back of the power supply. The PWR Fail
LED and the LED on the back of the power supply will also illuminate and
remain on (until the failed unit has been replaced).
Replacing the Power Supply
1.
Accessing the power supply:
You do not need to power down the system to replace a power module.
Remove the left/top chassis cover to access the power supply for
removal.
2.
Removing the power supply:
First, unplug the power cord from the failed power supply module. Then
remove the power supply connectors going to the motherboard and the
SCSI backplane. Finally, remove the screws that secure the unit to the
mounting brackets in the chassis and then pull the unit completely out.
3.
Installing a new power supply:
Replace the failed unit with another unit having the exact same part
number (SC742S-420). Gently but firmly push the new unit all the way
into the open bay. Secure it to the mounting brackets in the chassis with
the screws provided.
backplane, two to the motherboard (ATX PWR CONN and J15 connectors)
and also the power fail cable to JP8. Finish by replacing the chassis left/
top cover and then restoring power to the system.
Chapter 6: Advanced Chassis Setup
Connect the two power cables to the SCSI
6-9
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