Functional Description Of Base System Components - Digital Equipment MicroVAX 3600 Operation

The unswitched power outlets are always energized, while the switched
power outlets are controlled by the 3-position toggle switch and the devices
connected to the remote-sense input connectors.
The ac power cord of the BA213 unit is plugged into one of the unswitched
power outlets on the power controller. The ac power cord for each mass
storage option is plugged into a switched power outlet on the power controller.
A remote-sense output connector from the BA213 enclosure is connected to
one of the remote-sense input connectors (labeled J9, J 10, J 11, and J 12) on
the power controller by a remote power control bus cable.
The 3-position toggle switch determines how power is supplied to the
switched power outlets on the power controller. When the toggle switch
is set to A (the normal operating setting), the switched power outlets are
controlled by the on/off switch on the front of the BA213 enclosure. When
you turn on the system, all mass storage devices plugged into the switched
outlets are powered on. When you turn off the system, the mass storage
devices are powered off .
Two other settings are possible, but unusual. When the toggle switch is
set to 0, the switched power outlets are always de-energized. No power is
distributed to mass storage devices connected to the switched outlets when
the system is turned on. When the toggle switch is set to B, the switched
power outlets are always energized. Power is distributed to mass storage
devices connected to the switched outlets whether the system is on or off .
The power controller is protected by a circuit breaker that functions as a
system circuit breaker. If the circuit breaker trips, all outlets are de-energized
and the entire system loses power. You can reset the breaker by pushing it
down, then lifting it up.
The indicator light on the power controller remains lit as long as the system
is plugged into an active outlet. The light is unaffected by the operation of
the circuit breaker. If the light goes out, the power cord between the power
controller and the outlet may be loose, or the outlet may have lost power.
1.3 Functional Description of Base System
Components
Each MicroVAX/VAXserver system includes base system components
common to all systems, and perhaps optional components. Your system
was configured at the factory, based on your order.
System Overview 1-23