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Table 1-1. Electrical and Environmental Specifications (continued)
Power Supply (continued)
Maximum output and
current rating to I/O and
memory cards:
Short circuit protection:
+5.1 V
65.8 A
+5.0 V(M)
8.5A
+ 12.0 V
5.4 A
-12.0 V
3.4 A
Note that combined current available from the 5.1 V and
+5 V(M) power supplies is 70 A maximum
All dc power outputs are fault protected for short circuits
The power supply will shut down if any output is short
circuited when it receives power.
Optional DC Power (If an external battery is used,
it must be charged from an external source):
25 kHz AC VOLTAGE
Voltage:
Current:
Power:
BATTERY BACKUP
HP 12157B Battery Backup:
Battery type:
+ EXT BAT Input:
15.0 V maximum
10.5 V minimum
12.6 V nominal
- EXT BAT Input:
Ground
19.5 V rms ± 8% (at 0.02 to 1.5 A), split phase
(phase to common).
1.5 A maximum
50Wmaximum
Battery backup provides from 15 to 90 minutes of
memory sustaining power for up to four memory array
cards, depending upon system configuration, state of
charge, and temperature. Additional hold-up time can be
achieved by connecting an external battery.
Sealed lead-acid.
Introduction
1-3
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