IBM DS3500, Installation, User'S, And Maintenance Manual

Page: 37 / 193

Site wiring and power
The DS3500 storage subsystem (models DS3512-C2A and DS3524-C4A) and EXP3500 storage enclosure
(models EXP3512-E2A and EXP3524-E4A) are equipped with redundant ac power supply and fan units.
The storage subsystem ac power supplies are wide-ranging units that automatically accommodate
voltages to the ac power source. The power supplies operate within the range of 90 V ac to 264 V ac, at a
minimum frequency of 50 Hz and a maximum frequency of 60 Hz. The power supplies meet standard
voltage requirements for operation both inside the U.S.A. and outside the U.S.A. They use standard
industrial wiring with line-to-neutral or line-to-line power connections.
Power requirements for models equipped with ac power supplies are shown in Table 1-9.
Table 1-9. DS3500 ac power requirements
Low range High range
Nominal voltage 90 V ac to 140 V ac 200 V ac to 264 V ac
Frequency (Hz) 50 to 60 Hz 50 to 60 Hz
Approximate input kilovolt-amperes
(kVA) Minimum 0.06 kVA to maximum 0.38 kVA
The DS3524 model C4T storage subsystem and EXP3524 model E4T storage enclosure are equipped with
redundant dc power supply and fan units. The storage subsystem dc power supplies are wide-ranging
units that automatically accommodate voltages to the dc power source. The dc power supplies operate
within the range of -42 V dc to -60 V dc. The dc power supplies require a reliably grounded safety
extra-low voltage SELV source and an approved and rated 20 A disconnect device for the -48 V line.
Power requirements for models equipped with dc power supplies are shown in Table 1-10.
Table 1-10. DS3500 dc power requirements
Requirement
Operating voltage -42 V to -60 V
Nominal voltage -48 V
Operating current 16 A to 11.2 A
Rated disconnect device (circuit-breaker) 20 A
Power recovery
After normal power is restored after a total ac or dc power failure, the storage subsystem performs
power-on recovery procedures automatically without operator intervention.
Power cords and receptacles
Storage subsystems equipped with ac power supply and fan units come with two ac jumper cords that
are used to connect to the rack PDU. You must purchase the power cords that are applicable for use in a
typical receptacle in your country. See “Power cords” on page 7-5 for more information.
Storage subsystems equipped with dc power supply and fan units come with two dc jumper cables that
are used to connect to the site -48 V dc power source. The supplied dc jumper cables have 10 AWG
copper conductor wires. 12 AWG or larger copper conductor wires must be used for all of the wiring
between the DS3500 or EXP3500 dc power connectors and the dc power source. See the “DS3524 storage
subsystem and EXP3524 storage enclosure parts listing” on page 7-3 for more information.
Chapter 1. Introduction
1-19