IBM TotalStorage DS4800, Installation, User And Maintenance Manual, Page: 53 / 250

Table 13. DS4800 Storage Subsystem operational vibration specifications
Parameter Value
Frequency sweep 5 Hz - 150 Hz - 5 Hz
Wave form Sinusoidal, 0.25 g
Acoustic noise
Table 14 lists the maximum sound levels emitted by the storage subsystem.
Table 14. DS4800 Storage Subsystem sound levels
Measurement Level
Sound power (normal operation) 6.0 bels
Sound pressure (normal operation) 60 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 AC power requirements, and power cord routing instructions.
Consider the following information when preparing the DS4800 Storage Subsystem
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).
v Power failures – If a total power failure occurs, the unit automatically performs a
power-up recovery sequence without operator intervention after power is
restored.
Table 15. IBM System Storage DS4800 AC power requirements
Low Range High Range
Nominal Voltage 110 220
Voltage 90 to 132 VAC 198 to 264 VAC
Frequency (Hertz) 50 to 60 Hz 50 to 60 Hz
Minimum Operating Current 3.0 A
a
1.5 A
b
Maximum Operating Current 3.0 A
a
1.5 A
b
Maximum Surge Current 4.0 A
a
2.0 A
b
Chapter 1. Introduction
25
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