User`s guide

4
Power and Cooling Systems
The power system for the VAX 6000 platform consists of an AC power
controller, the power and logic unit, three DC-to-DC power regulators
(plus two optional power regulators for a VAXBI subsystem), an optional
uninterruptible power supply, and a temperature sensor. The cooling
system consists of two blower units and an airflow sensor, with the airflow
path through the XMI and optional VAXBI card cages. See the VAX 6000
service manuals for more on power components.
4.1 Power System
The power system contains the following components:
• An H405-E AC power controller for 60 Hz systems; for 50 Hz, an
H405-F and a high-voltage autotransformer
• An H7206-B power and logic unit (PAL)
• Two H7215 DC-to-DC power regulators, one for the XMI card cage and
one for the VAXBI card cages
• Two H7214 DC-to-DC power regulators, one for the XMI card cage and
one for the VAXBI card cages
• One H7242 DC-to-DC power regulator for the XMI card cage
• An XTC power sequencer
• A temperature sensor and an airflow sensor
• An optional H7236–A battery backup/uninterruptible power supply
(BBU)
4–1