v Velocity change = 20 inches per second
v Wave form = 1/2 Sine, 10g @5ms
Operational Vibration (Random): While in its normal operating position, the DCS3700 will continue
operating when subjected to a random vibration test using the criteria shown in Table 10. This test uses
the indicated spectral power density for 30 minutes in each of the three axes.
Table 10. Random vibration power spectral density
Hz 5 17 150 200 500
g
2
/Hz 9.0x10
-5
3.0x10
-4
3.0x10
-4
9.0x10
-5
9.0x10
-5
Acoustic noise
Table 11 lists the maximum sound levels emitted by the storage subsystem.
Table 11. DCS3700 sound levels
Measurement Level
Sound power (normal operation) 7.0 bels
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.
Attention: The DCS3700 does not support 90-136V AC sources. It supports 200-240V AC sources only.
Ensure that the AC input is appropriate for the DCS3700 before turning the power switches to the on
position.
Table 12. DCS3700 ac power requirements
AC Power Requirements Range
Nominal Voltage 180 to 264 VAC
Frequency (Hertz) 50 to 60 Hz
Idle Current 4.27 A
a
Maximum Operating Current 4.10 A
a
Maximum Surge Current 7.82 A
a
a.
Typical voltage: 220 V AC, 50 Hz
20 IBM System Storage DCS3700: Installation, User, and Maintenance Guide
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