Digital Equipment AlphaServer 1200, Руководство по обслуживанию

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System Overview 1-31
Description
Two power supplies provide system power. Redundant power is not available at
this time and each has 450 W output.
Power Supply Features
•
88–132 and 176–264 Vrms AC input
•
450 watts output. Output voltages are as follows:
Output Voltage Min. Voltage Max. Voltage Max. Current
+5.0 4.90 5.25 52
+3.43 3.400 3.465 37.4
+12 11.5 12.6 17
–12 –13.2 –10.9 0.5
–5.0 –5.5 –4.6 0.2
Vaux 4.85 5.25 0.6
•
Remote sense on +5.0V and +3.43V
+5.0V is sensed on the system motherboard.
+3.43V is sensed on all CPUs in the system and the system bus motherboard.
•
Current share on +5.0V, +3.43V, and +12V.
•
1 % regulation on +3.43V.
•
Fault protection (latched). If a fault is detected by the power supply, it will shut
down. The power supply faults detected are:
Fan Failure
Over-voltage
Over-current
Power overload
•
DC_ENABLE_L input signal starts the DC outputs.
•
FAN_FAULT_H input signal shuts the power supply off in case of a system fan
or CPU fan failure.
•
POK_H output signal indicates that the power supply is operating properly.