CarNetix PSU-PC19 DC Installation Manual
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CarNetix PSU-PC19 Ver. 1.1 Pre-production Installation Manual4.0 Startup/Shutdown ControllerThe PSU-PC19 includes an intelligent, microprocessor-based startup/shutdown controller. The PSU-PC19 Startup/Shutdown Controller (SSC) provides safe, reliable control over your Xenarc SC8bootup and shutdown (full shutdown, Standby, or hibernation) processes. The chief concerns of theSSC are protecting your hard drive from corruption, protecting your car battery from beingdischarged, and protecting the PSU from overheating.4.1 Hibernate/Standby OperationThe PSU-PC19 supports both Hibernate and Standby operation of your Xenarc SC8. This option isjumper selectable with Pins 5 & 6 on JP1.When supporting Hibernation the PSU-PC19 completely shuts down all power to the CarPC afterthe Shutdown Lockout State. However, if Standby mode is selected, the PSU-PC19 continues toprovide primary and secondary output power after the Shutdown Lockout State is completed, butturns off its fans to conserve power. This has several very important ramifications.1) In Standby your Xenarc SC8 continues to receive power from the PSU-PC19 so that it can retainthe processor state in RAM. If for some reason the Xenarc SC8 did not properly shut down when itreceived the ACPI shutdown pulse from the PSU-PC19, it will continue to draw current from thePSU-PC19. If this current exceeds approximately 1 amp the PSU-PC19 will automatically shut itselfdown.2) Any USB devices connected to your Xenarc SC8 via the USB connector will continue to drawcurrent in the Standby state. THIS COULD POTENTIALLY DRAIN YOUR BATTERY IF THECURRENT DEMAND OF YOUR USB DEVICES IS VERY HIGH. Exercise caution when usingUSB devices in the Standby mode, or connect your USB devices to the secondary output of thePSU-PC19 and jumper the Secondary Output to “follow DLYON”.4.2 SSC Operation States4.2.1 Idle StateWhile idle, the SSC monitors your car battery while waiting for the ignition switch to be turned on.If the battery is below approximately 10.6 volts, the SSC will not allow the Xenarc SC8 to boot. Ifthe battery is above 10.6 volts, the SSC will allow the Xenarc SC8 to boot normally.4.2.2 RunDelay StateWhen you turn on your ignition, the SSC briefly (approx. 1 second) enters the RunDelay state.During this time the SSC checks to make sure the battery is stable, the ignition stays on, and thenturns on its PSU output to the Xenarc SC8.- 22 - |
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