User`s guide

The VAX 6000 Platform Overview
Table 1–4 DC Power Distribution
Current (Amps)
Voltage Min. – Max. Description
XMI
+5V 1 – 130 Main logic supply
+3.3V 1 – 80 Main logic supply
+12V 0 – 4 Communications devices and TK tape drive
–12V 0 – 2.5 Communications devices
–5.2V 0 – 20 ECL supply
–2V 0 – 7 ECL terminator voltage
VAXBI
+5V 1 – 130 Main logic supply
+12V 0 – 4 Communications devices
–12V 0 – 2.5 Communication devices
–5.2V 0 – 20 ECL voltage
–2V 0 – 7 ECL teminator voltage
H7206-B power and logic module (PAL)
+24V 0 – 4 Blowers and airflow sensor
Ethernet transceivers
+13.5V 0 – 1.5
Power is supplied by three power regulators: H7214, H7215, and H7242.
Two more regulators can be installed for an optional VAXBI (H7214 and
H7215).
The optional H7236-B battery backup unit has a one second "ride-through"
capability that enables the system to function for that second after a power
failure. If power returns within the second, the system simply continues.
If, however, power does not return that quickly, the system ceases to
operate but goes into a warm start state while the battery continues to
power the XMI and all memory, whether in caches or not. The BBU is
capable of maintaining the warm state for 10 minutes and, should power
return during that time, the system will do a warm start. If the power
outage is longer than 10 minutes, the system performs a cold start.
The H7206-B power and logic unit has ten LEDs that are used to indicate
the state of the power system. It also has a reset switch. See the VAX
6000 Platform Service Manual for more information.
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