PS 4000 Gen2 Series Hardware Manual
1-11
1.4.3
PSUs/Cooling Modules
The PS 4000 Gen2 Series system has two redundant, hot-swappable PSUs that provide power and
built with a cooling fan that helps with the airflow, providing an efficient ventilation.
Number
Part
Extraction Lever
Retention Screw
Power Socket
Power Switch
PSU Status LED
Fan
When the cooling modules operate under normal conditions, the cooling fans run at a low speed. The
cooling fans raise their rotation speed to increase the airflow under the following conditions:
•
Component failure: if the cooling module, PSU, or a temperature sensor failed.
•
Elevated temperature: if the temperature breaches the upper threshold set for any of the interior
temperature sensors.
•
During the initialization stage, the cooling fans operate at a high speed. The speed is lowered when
the initialization is complete and no errors are detected.
NOTE:
There are two upper temperature thresholds: one for event notification and the other for
triggering high fan rotation speed. You can change the preset values for event notification using the
firmware-embedded configuration utility. Refer to the firmware operation manual for details.