IBM DS3950, Руководство пользователя и инструкция по установке

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Table 14. EXP395 sound levels
Measurement Level
Sound power (normal operation) 6.5 bels
Sound pressure (normal operation) 65 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 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. EXP395 ac power requirements
Low Range High Range
Nominal Voltage 90 to 136 VAC 180 to 264 VAC
Frequency (Hertz) 50 to 60 Hz 50 to 60 Hz
Idle Current 3.86 A
a
2.05 A
b
Maximum Operating Current 4 A/4.54 A
a c
2.12 A/2.41 A
b c
Maximum Surge Current 5.04 A
a
2.67 A
b
a.
Typical voltage: 115 V AC, 60 Hz, assumes 73% power-supply efficiency and 0.99 power
factor
b.
Typical voltage: 230 V AC, 60 Hz, assumes 73% power-supply efficiency and 0.99 power
factor
c.
The higher number in this range applies when all of the drives are placed in Selfseek
mode.
Power and site wiring requirements for models with power
supply and fan units
The storage expansion enclosure uses wide-ranging redundant power supplies that
automatically accommodate voltages to the power source. The power supplies
operate within the ranges specified in Table 15. The power supplies meet standard
Chapter 1. Introduction
17