Cooling Module - Lenovo Storage D1212 Hardware Installation And Maintenance Manual

Figure 25. 2214W PSU
Dual PSUs provide redundant power for the system: if one PSU fails, the other keeps the system running
while you replace the faulty module. The PSUs are hot-swappable. Replacement of a PSU can be performed
while the enclosure is running, but the procedure must be completed within two minutes of the removal of
the defective PSU. Ensure that you have a replacement PSU before you remove the defective PSU.
The enclosure chassis is keyed to prevent PSUs from being inserted upside down.
The back of the PSU has a power switch, three status LEDs, and a socket for the power cord (see Figure 26
"PSU LEDs" on page 23).
Figure 26. PSU LEDs

Cooling Module

Note: 5U Enclosures only.
The five cooling modules at the rear of the enclosure maintain all system components below their maximum
temperature, assuming the ambient temperature is below 35°C.
The speed of the fans in the cooling modules is controlled by the ESM. Refer to "System Airflow" on page 24.
. 23
Chapter 2 System Overview