HP E8402A, User And Service Manual, Page: 219 / 249

HP E8402, E8404A Product Specifications 221 Appendix A
•
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.
Cooling Mode (High or
Variable)
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 8 discrete speeds as a function of:
Module exhaust temperature limits (user settable)
Module exhaust temperature rise (
∆
T) limits
Ambient temperature limit (user settable)
Power supply temperature limit (fixed).
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
Airflow Path
Inlet through rear and exhaust through upper sides for both power supply
and modules. Allow 50mm clearance for proper airflow.
Air Filter Kit available for demanding environmental applications.
18.0
12.0
6.0
24.0
5.0 10.0 15.0 20.0 25.0
Airflow Through Module (liters/sec)
0.0
Worst Slot
Pressure Drop
Across Module
(mm H
2
0)