IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 51 / 252

Table 10. DS3950 power and heat dissipation
Parameter KVA Watts (ac) Btu per hour
DS3950 0.496 447 1529
Shock and vibration requirements
Operational shock and operational vibration requirements are shown in this
section.
Operational Shock: The DS3950 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
DS3950 will continue operating when subjected to a random vibration test using
the criteria shown in Table 11. This test uses the indicated spectral power density
for 30 minutes in each of the three axes.
Table 11. 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 12 lists the maximum sound levels emitted by the storage subsystem.
Table 12. DS3950 sound levels
Measurement Level
Sound power (normal operation) 6.4 bels
Sound pressure (normal operation) 68 dBA
These levels are measured in controlled acoustical environments according to ISO
7779 and are reported in accordance with ISO 9296. The declared sound power
levels indicate an upper limit, below which a large portion of machines operate.
Sound pressure levels in your location might exceed the average 1-meter values
stated because of room reflections and other nearby noise.
Electrical requirements
This section provides information regarding site power and wiring, storage
subsystem power requirements, and power cord routing instructions.
Consider the following information when preparing the installation site:
v
Protective ground – Site wiring must include a protective ground connection to
the ac power source.
Note: Protective ground is also known as safety ground or chassis ground.
v Circuit overloading – Power circuits and associated circuit breakers must
provide sufficient power and overload protection. To prevent possible damage to
the unit, isolate its power source from large switching loads (such as air
conditioning motors, elevator motors, and factory loads).
Chapter 1. Introduction
23