Table 12 lists the KVA, watts, and Btu calculations. These values assume the power
supplies have a 73 percent efficiency and a power factor of 0.99. These tabulated
power and heat dissipation values are typical for the storage subsystem. Maximum
configuration units are typically operated at higher data rates, have larger random
access memory (RAM) capacities, or have different host interface boards.
Table 12. EXP395 power and heat dissipation
Parameter
KVA
Watts (ac)
Btu per hour
EXP395
0.454
443
1516
Shock and vibration requirements
Operational shock and operational vibration requirements are shown in this
section.
Operational Shock:
The EXP395 will be able to withstand the following shock.
Subjecting the equipment to a single shock pulse with the following characteristics
will simulate this level of shock:
v
Velocity change = 20 inches per second
v
Wave form = Triangular, 10g @3.75 ms
Operational Vibration (Random):
While in its normal operating position, the
EXP395 will continue operating when subjected to a random vibration test using
the criteria shown in Table 13. This test uses the indicated spectral power density
for 30 minutes in each of the three axes.
Table 13. Random vibration power spectral density
Hz
5
17
45
48
62
65
150
200
500
g
2
/Hz
2.0x10-7
-7
2.2x10
-5
2.2x10
-5
2.2x10
-5
2.2x10
-5
2.2x10
-5
2.2x10
-5
2.2x10
-5
2.2x10
-5
Acoustic noise
Table 14 on page 17 lists the maximum sound levels emitted by the storage
subsystem.
77027-02
Figure 7. EXP395 airflow
16
IBM System Storage DS3950 EXP395 Storage Expansion Enclosure: Installation, User’s, and Maintenance Guide
Summary of Contents for DS3950
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