IBM DS4800 User, Installation And Maintenance Guide

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 13. 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
a.
Typical voltage: 120 V AC, 60 Hz, assumes 75% power-supply efficiency and 0.99 power
factor
b.
Typical voltage: 240 V AC, 60 Hz, assumes 75% power-supply efficiency and 0.99 power
factor
Site wiring and power
The storage subsystem uses wide-ranging redundant power supplies that
automatically accommodate voltages to the AC power source. The power supplies
operate within the range of 90 VAC to 264 VAC, at a minimum frequency of 50 Hz
and a maximum frequency of 60 Hz. The power supplies meet standard voltage
requirements for both domestic (inside USA) and international (outside USA)
operation. They use standard industrial wiring with line-to-neutral or line-to-line
power connections.
The agency ratings for the DS4800 Storage Subsystem are 5 amps at 100 VAC
and 2.25 amps at 240 VAC. These are the overall maximum currents for this
system.
AC power recovery
After normal power is restored after a total AC power failure, the DS4800 Storage
Subsystem performs power-up recovery procedures automatically without operator
intervention.
Chapter 1. Introduction 23

IBM DS4800 Specifications

General

Brand	IBM
Model	DS4800
Category	Storage
Language	English