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Cooling Mode (High or
Variable)
Appendix A
24.0
18.0
Pressure Drop
Across Module
(mm H
0)
2
12.0
6.0
0.0
•
All other slots blocked. Airflow decreases as additional slots are
opened.
•
Performance shown for Worst Slot (slot 2). Airflow is greater in all
other slots.
•
Fans on Full Speed. Minimum airflow is approximately 50% with
fans on Variable Speed.
•
Air Filter Kit not installed. Airflow is reduced approximately 10%
with clean air filters installed.
•
Measurements taken at 1,500m altitude.
Switchable on the front panel. Controls both impeller and fan.
High Fan Speed Mode: Full Airflow all the time.
Variable Fan Speed Mode:
Fan Speed increments through 5 discrete speeds as a function of power
supply temperature and reference temperature. Reference
temperature (pins 11,12 of Diagnostic Connector) is measured on
the backplane and is a function of load and ambient temperature.
At full load:
Low Speed up to approximately 30°C ambient.
High Speed above approximately 40°C ambient.
At no load:
Low Speed up to approximately 40°C ambient.
High Speed above approximately 50°C ambient.
Assuming default limits:
At full load:
Low Speed up to approximately 30°C
High Speed above approximately 40°C
At no load:
Low Speed up to approximately 40°C
High Speed above approximately 50°C
HP E8401A, E8403A Product Specifications
Worst Slot
5.0
10.0
15.0
Airflow Through Module (liters/sec)
20.0
25.0
57
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