Dell POWERVAULT MD1000 - Manual (Page 17)

About Your System 17
EMM Thermal Shutdown
If critical internal temperatures are reached, the enclosure will be shut down automatically via either a
thermal shutdown command issued by the EMM firmware or via a command from Server Administrator.
Power Supply and Cooling Fan Features
Your storage enclosure supports two integrated, hot-pluggable power supply/cooling fan modules. Each
module contains two separate cooling fans. Both modules must be installed to ensure proper cooling.
The enclosure requires at least three of the cooling fans to operate to avoid overheating.
CAUTION: A power supply/cooling fan module can be removed from a powered-on enclosure; however, the
enclosure will shut down if overheating occurs.
A power supply/cooling fan module can be replaced without powering down the enclosure. For
information on removing and replacing the modules, see "Removing and Installing the Power
Supply/Cooling Fan Module."
Figure 1-8 shows the power supply/cooling fan module features and LED indicators. Table 1-5 lists the
LED indicator descriptions.
Figure 1-8. Power Supply and Cooling Fan Module LED Features and Indicators
1 DC power LED 3 AC power LED 5 AC power connector
2 Power supply/cooling fan fault
LED
4 cooling fans (2) 6 on/off switch
1 4
6 5
2 3