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v Power failures – If a total power failure occurs, the unit automatically performs a
Table 14. EXP420 ac power requirements
Nominal Voltage
Frequency (Hertz)
Idle Current
Maximum Operating Current
Maximum Surge Current
a.
factor
b.
factor
c.
mode.
Site wiring and power
The storage expansion enclosure 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 EXP420 storage expansion enclosure are 6 amps at 100
VAC and 2.5 amps at 240 VAC. These are the overall maximum operating currents
for this system.
Power recovery after ac power failure
After normal power is restored after a total ac power failure, the EXP420 storage
expansion enclosure performs power-up recovery procedures automatically without
operator intervention.
Power cords and receptacles
The EXP420 ships with two jumper cords used to connect to the rack PDU. You
must purchase the power cords that are appropriate for use in a typical outlet in the
destination country. See Appendix C, "Power cords," on page 117 for more
information.
Heat output, airflow, and cooling
See "Airflow and heat dissipation" on page 15 for heat output, airflow, and cooling
specifications.
Note: In general, disk subsystem reliability tends to decrease as the ambient
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: 115 V AC, 60 Hz, assumes 73% power-supply efficiency and 0.99 power
Typical voltage: 230 V AC, 60 Hz, assumes 73% power-supply efficiency and 0.99 power
The higher number in this range applies when all of the drives are placed in Selfseek
temperature of the environment in which it is being used increases. The
ambient temperature in the immediate area of the disk enclosure unit should
be kept near 22° C (72° F), or lower, to provide better reliability.
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
High Range
180 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
17
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