Consider the following information when you prepare the 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-on recovery sequence without operator intervention after power is
restored.
Site wiring and power
The site wiring and power requirements to operate the DS3500 storage subsystem
are specified in this topic.
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. The ac power supplies have C14 power inlets.
Power requirements for models equipped with ac power supplies are shown in
Table 9.
Table 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 10.
Table 10. DS3500 dc power requirements
Requirement
Operating voltage -42 V to -60 V
Nominal voltage -48 V
Chapter 1. Introduction 21
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