Owner`s manual

Figure 3–6 shows the AC power controller, which is at the rear of the
cabinet.
Circuit Breaker
The circuit breaker controls power to the entire system, including the power
regulators, blowers, and in-cabinet options. Current overload causes the
circuit breaker to move automatically to the Off position, so that power to
the system is turned off.
For normal operation, the circuit breaker must be in the On position, which
is fully pressed in. To trip the circuit breaker, pull it out toward you, away
from the machine, until the circuit breaker handle is flush with the AC
power controller.
If the temperature of the system exceeds 75
o
C (167
o
F), the "contactor" in
the AC power controller is opened and the system powers down.
AC Power Test Receptacle Fuses
These three fuses are used as a protective measure during power testing
at the AC power test receptacle.
AC Outlets (Unswitched)
The two unswitched outlets on the AC power controller are used to power
in-cabinet disk drives or a battery backup unit. The outlet fuses are to the
left of the outlets.
DEC Power Control Bus
Two DEC power control bus connectors are located on the AC power
controller. The power control bus provides central power-up and power-
down capability by connecting the power controllers in your system, VAXBI
expander, and storage cabinets.
AC Power Test Receptacle
This covered receptacle is used by Digital customer service engineers to
connect test equipment that monitors AC power.
Controls and Indicators 3–13