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

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Table 1-7. Temperature and humidity requirements for storage subsystems in an Information Technology (IT) or office
environment (continued)
Condition Parameter Requirement
Temperature (storage subsystem Off) Operating range -10° to 50°C (14.0° to 120.0°F)
Maximum altitude 3000 m (9840 ft)
Maximum rate of change 15°C (27.0°F) per hour
Relative humidity (storage subsystem
Off) Operating range 10% to 90%
Maximum dew point 26°C (79°F)
Maximum humidity gradient 10% per hour
Note:
1. The non-operating environment must not exceed the environment limits for longer than 60 days.
2. The storage environment must not exceed the environment limits for longer than 1 year.
3. Substantial deviations from the suggested operating range, in either direction, if sustained for extended periods of
time, will expose the unit to greater risk of failure from external causes.
Table 1-8 lists temperature and humidity ranges for the storage subsystem in a NEBS/ETSI compliant
environment.
Table 1-8. Temperature and humidity requirements for storage subsystems in a NEBS/ETSI compliant environment
Condition Parameter Requirement
Temperature
1
Operating range 5° - 40° C (41° - 104° F)
Short-term
2
-5° - 50° C (23° - 122° F)
Maximum rate of change 30° C (54° F) per hour
Relative humidity
1
(no condensation) Operating range 5% to 85%
Short-term
2
5% to 90% (not to exceed 0.024 kg
water/kg of dry air)
Note:
1. In a NEBS/ETSI compliant environment, conditions are measured at a location 1.5 m (59 in.) above the floor and
400 mm (15.8 in.) in front of the equipment.
2. Short-term refers to a period of not more than 96 consecutive hours and a total of not more than 15 days in one
year. (This refers to a total of 360 hours in any given year, but no more than 15 occurrences during that one-year
period.)
Electrical requirements
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.
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System Storage DS3500 and EXP3500: Installation, User's, and Maintenance Guide