Fan Controls And Indicators - IBM TotalStorage DS4000 EXP700 Installation, User's, And Maintenance Manual

Figure 5. Power-supply controls, indicators, and connectors
v Levers: When you remove or install a power supply CRU, the levers located at
v Power LEDs: These green power LEDs are lit when the storage expansion
v Fault LED: The amber power-supply fault LED is lit if a power-supply failure
v Power switches: The power switches are used to turn the power supplies on
v AC power connectors: To provide ac power to the storage expansion enclosure,
v Hot-swap power-supply CRUs: The two hot-swap power supplies are located

Fan controls and indicators

The storage expansion enclosure comes with two fan units. Each storage
expansion enclosure has two fans as shown in Figure 6 on page 10. The fan units
in your storage expansion enclosure are hot-swappable and redundant. One fan will
continue to operate if the other fan fails. You can remove and replace the fan unit
while the storage expansion enclosure is powered on and accessing drives.
Each fan has a temperature sensor built into the air inlet. This sensor maintains fan
speed to provide the necessary air flow. If the speed of one of the fans drops to a
level that is too low or stops, the Fault LED located on the back of the fan unit is lit,
and the General system error LED on the front of the storage expansion enclosure
is lit. For the locations of the LEDs on the front of the storage expansion enclosure,
see Figure 4 on page 7. For the LEDs on the back of the storage expansion
enclosure, see Figure 6 on page 10.
Attention:
force out hot air. These fans are hot-swappable and redundant; however, when one
fan fails, the failed fan unit must be replaced within 48 hours to maintain
redundancy and optimum cooling. When you remove the failed unit, be sure to
install the replacement fan unit within 10 minutes to prevent overheating.
the top of the power supply CRU must be unlocked.
enclosure is turned on and receiving ac power.
occurs.
and off. You must turn on both switches to use the redundant power supplies.
power cables must be connected to the ac power connectors located on the back
of the storage expansion enclosure.
on the back of the storage expansion enclosure. Both power-supply CRUs must
be installed, even if one power supply is not working.
The fans in your storage expansion enclosure draw in fresh air and
Levers
Power LEDs
Fault LEDs
Power switches
1 Gb/s 2 Gb/s
X10 X1 Conflict
Tray Number
AC power
connectors
Power supply CRUs
9
Chapter 1. Introduction