Dell IP4700, Installation And Service Manual

Page: 83 / 126

3
Replacing a Power Supply Module
3-23
Servicing and Upgrading an IP4700
Replacing a Power Supply Module
CAUTION
!
To access a power supply module, you must remove the drive fan
pack. If the drive fan pack is removed for more than 2 minutes, the
storage processors and disk modules power down. They will power
up when you reinstall the drive fan pack.
Handle a power supply gently, and use an ESD wristband. Do not
remove a power supply until you have a replacement supply or
filler module available.
Turn off the power supply before unplugging the ac line cord from
the supply or removing the supply from the enclosure.
IMPORTANT: If one power supply is off and the other is on, do not turn one
on and immediately turn the other off. Instead, turn one on and wait five
seconds before turning the other off.
Replace the failed power supply with the same type of power supply (as
shown in the power supply section of Chapter 1).
Be sure to correctly identify the correct power supply — PS A or PS B. If the
wrong power supply is shut off, the system will power down.
To remove a power-supply module:
1. Remove the drive fan pack. See Replacing the Drive Fan Pack on
page 3-20.
2. Set the power supply’s power switch to the off (0) position.
3. Unplug the ac power cord from the power supply’s ac inlet.
4. Remove the power cord from the enclosure.
5. If you are removing the top power supply, push the latch up and
to the right as far as possible. If you are removing the bottom
power supply, push the latch up and to the left as far as possible.
See Figures 3-12 and 3-14.
6. Grasp the power supply handle with one hand. Gently pull the
power supply from the enclosure, while supporting it with your
other hand. See Figures 3-13 and 3-15.