Electrical Requirements; Site Wiring And Power; Ac Power Recovery; Ibm System Storage Ds4800 Ac Power Requirements - IBM DS4800 User, Installation And Maintenance Manual

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
v Circuit overloading – Power circuits and associated circuit breakers must provide
v Power failures – If a total power failure occurs, the unit automatically performs a
Table 13. IBM System Storage DS4800 AC power requirements
Nominal Voltage
Voltage
Frequency (Hertz)
Minimum Operating Current
Maximum Operating Current
Maximum Surge Current
a.
factor
b.
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.
the AC power source.
Note: Protective ground is also known as safety ground or chassis ground.
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).
power-up recovery sequence without operator intervention after power is
restored.
Typical voltage: 120 V AC, 60 Hz, assumes 75% power-supply efficiency and 0.99 power
Typical voltage: 240 V AC, 60 Hz, assumes 75% power-supply efficiency and 0.99 power
Low Range
110
90 to 132 VAC
50 to 60 Hz
a
3.0 A
a
3.0 A
a
4.0 A
High Range
220
198 to 264 VAC
50 to 60 Hz
b
1.5 A
b
1.5 A
b
2.0 A
Chapter 1. Introduction
23