CarNetix PSU-PC12 V1.1 Installation Manual
4.2.3 Bootup Lockout State
After the Xenarc SC3 is powered, the ACPI (PWRON) strobe is sent to the motherboard.
At this point the SSC enters a "Lockout" state. In this state the SSC will not allow the
PSU to be turned off until after a jumper-selectable Lockout Time period. This state is
designed to prevent damage or corruption of a user's hard drive during bootup or
shutdown by premature loss of power. The Lockout Time is jumper-selectable at either
30 seconds or 90 seconds. This allows users who have configured their Xenarc SC3 for
hibernation to enjoy a faster shutdown sequence (30 seconds) than those who have their
Xenarc SC3 configured for full shutdown (90 seconds).
4.2.4 Run State
After the Lockout period ends, the SSC enters the Run state. During this time your
Xenarc SC3 is running normally and the SSC continues to monitor your car battery, the
PSU fan, and the output current. If the battery dips below approximately 10.5volts for
more than 10 seconds, or if the fan fails, or if the user is drawing more than the specified
maximum output current, the SSC enters a "ForcedShutdown" state (described below).
Under normal conditions, you exit the Run State either by turning off the ignition switch
or with a remotely applied pulse. After normally exiting the Run State, the SSC enters the
Shutdown Delay State.
4.2.5 Shutdown Delay State
After you turn off your ignition, or apply a remote pulse, the SSC enters a Shutdown
Delay state. This state allows you to keep your Xenarc SC3 running for a jumper
selectable time after the ignition is turned off. The selectable time periods are 6 seconds
(default) and 1 minutes. During this Shutdown Delay State, turning the ignition switch
back on will cause the SSC to re-enter the Run State and cancel the shutdown sequence.
Also, a remotely applied pulse can either prolong the Shutdown Delay State, or send the
PSU immediately into Shutdown Sequence State (see Section 6 Remote Start Pulse).
When this Shutdown Delay time has elapsed, the SSC enters the Shutdown Sequence
state (see below).
The SSC timing is designed to accommodate the use of the ACC wire instead of the IGN
wire to control the SSC. Note that during engine cranking, the ACC wire drops from
+12V to zero volts. The SSC has a minimum 6 second delay to accommodate this
temporary interruption in input voltage if the Xenarc SC3 was already running when you
start (or re-start) your engine. This delay will also give you time to briefly turn off the
ignition switch to stop your engine (ie at a gas station) and immediately turn the ignition
switch back on to keep the Xenarc SC3 running indefinitely.
4.2.6 Shutdown Sequence State
At the beginning of this state the SSC issues an ACPI (PWRON) strobe to the
motherboard. After the ACPI strobe is sent the SSC enters a Shutdown Lockout time
period, in which the SSC prevents the PSU from being turned on. This is to prevent the
SSC from issuing multiple ACPI strobes to the Xenarc SC3 motherboard while it is
shutting down. The Shutdown Lockout time is the same length as the Bootup Lockout
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