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The computer or system also must be properly protected by fuses or circuit breakers of sufficient
capacity to carry the current load specified for the computer or system. Refer to Figures 1-1 and
1-2 for descriptions of the various types of ac power cord configurations.
Cooling Requirements
No external cooling is required for the computer or system. The internal fans provide enough
airflow as long as the computer or system is operated within the temperature limitations specified
in Table 1-1 and the front and rear grills are not obstructed.
Four fans provide approximately 10.1 cubic meters per minute (360 CFM) front-to-rear airflow.
Half of the airflow is used to cool the power supply, and half the airflow is directed through the
card cage.
Mounting Considerations
You can use the computer either free-standing on a table, or mounted in a standard 483 mm
(19-inch) equipment rack. If used in a mobile environment, install the computer in a shock-
mounted equipment rack. Refer to Table 1-1 for physical dimensions of the computer. When
mounting the A990 on a table, provide enough clear space at the front and back of the computer
to permit an unimpeded intake and exhaust of airflow.
Table 1-1. Electrical and Environmental Specifications
ELECTRICAL SPECIFICATIONS
AC Power Requirements
Line voltage:
Line frequency:
86 to 138 Vac (115 Vac -25%/
+
20%) standard;
172 to 276 Vac (230 Vac -23 %/ + 20%) option 015.
47.5 to 66 Hz
Inrush Current (cold power-up): 20.0 Amps maximum (at 115 Vac)
40.0 Amps maximum (at 230 Vac)
Maximum Power Required:
Power Supply
Output DC voltages
and tolerances:
Available Backplane Power:
1-2
Introduction
750 Watts (1400 VA)
+5.1 V
+
12.0 V
-12.0 V
±2%
+6/-3%
±6%
380 Watts, maximum. An additional 60 Watts of backplane
power may be used if the input voltage range is limited to
voltages between 104-138 Vac (standard) or 178-276 Vac
(option 015).
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