Power And Site Wiring Requirements For Models With Ac Power Supply And Fan Units; Ds4700 Express Ac Power Requirements; Ds4700 Express Dc Power Requirements - IBM DS4700 Installation, User's, And Maintenance Manual

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 20. DS4700 Express ac power requirements
Nominal Voltage
Frequency (Hertz)
Idle Current
Maximum Operating Current
Maximum Surge Current
a.
Typical voltage: 115 V ac, 60 Hz, assumes 72% power-supply efficiency and 0.99 power
factor
b.
Typical voltage: 230 V ac, 60 Hz, assumes 72% 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.
Table 21. DS4700 Express dc power requirements
Operating Voltage
Nominal Voltage
Idle Current
Maximum Operating Current
Maximum Surge Current
Power and site wiring requirements for models with ac power
supply and fan units
The storage subsystem uses wide-ranging redundant power supplies that
automatically accommodate voltages to the ac power source. The ac power
supplies operate within the ranges specified in Table 20. The ac 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 DS4700 Express Storage Subsystem (ac models) are 6
amps at 100 VAC and 2.5 amps at 240 VAC. These are the overall maximum
operating currents for the DS4700 Express Storage Subsystem with ac power
supply and fan unit CRUs.
AC power recovery: After a total ac power failure, after normal power is restored,
the storage subsystem performs power-up recovery procedures automatically
without operator intervention.
Power cords and receptacles: The storage subsystem ships with two jumper
cords used to connect to the rack PDU. You must purchase the power cords that
Low Range
90 to 136 VAC
50 to 60 Hz
a
3.86 A
a c
4 A/4.54 A
a
5.04 A
Requirement
-42 V to -60 V
-48 V
11.8 A
15.8 A
16 A
High Range
198 to 264 VAC
50 to 60 Hz
b
2.05 A
b c
2.12 A/2.41 A
b
2.67 A
Chapter 1. Introduction
27