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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
Low Range High Range
Nominal Voltage 90 to 136 VAC 198 to 264 VAC
Frequency (Hertz) 50 to 60 Hz 50 to 60 Hz
Idle Current 3.86 A
a
2.05 A
b
Maximum Operating Current 4 A/4.54 A
ac
2.12 A/2.41 A
bc
Maximum Surge Current 5.04 A
a
2.67 A
b
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
Requirement
Operating Voltage -42 V to -60 V
Nominal Voltage -48 V
Idle Current 11.8 A
Maximum Operating Current 15.8 A
Maximum Surge Current 16 A
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
Chapter 1. Introduction 27