IBM DS4700 manual Electrical requirements, Shock and vibration requirements, Acoustic noise

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 17. DS4700 Express power and heat dissipation

Parameter	KVA	Watts (ac)	Btu per hour
DS4700 Express	0.454	443	1516

Shock and vibration requirements

Operational shock and operational vibration requirements are shown in this section.

Operational Shock: The DS4700 Express 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:

vVelocity change = 20 inches per second

vWave form = Triangular, 10g @3.75 ms

Operational Vibration (Random): While in its normal operating position, the DS4700 Express will continue operating when subjected to a random vibration test using the criteria shown in Table 18. This test uses the indicated spectral power density for 30 minutes in each of the three axes.

Table 18. Random vibration power spectral density

Hz	5	17	45	48	62	65	150	200	500
g2/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 19 lists the maximum sound levels emitted by the storage subsystem.

Table 19. DS4700 Express sound levels

Measurement	Level
Sound power (normal operation)	6.8 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 ac power requirements, dc power requirements and power cord routing instructions.

Consider the following information when preparing the installation site:

vProtective 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.

26IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide