GE D25 User Manual

Contents

D25User's Manual GE Grid Solutions98 994-0081-3.00-21 GE InformationDownloading a Configuration, ContinuedWhat Happenswhen the Filesdo not Match?A mismatch error between Code and Configuration files causes the D25 toreboot.How Does theD25 React toThis type ofError?The D25’s base system performs this procedure after each reboot:1. Every time the D25 is rebooted, a counter is incremented.2. If the D25 runs for 2 minutes without a reboot, this counter is cleared.3. If the counter ever reaches 20, the base system invalidates theconfiguration by writing "KILL" into the configuration file withoutrecalculating the file’s CRC.4. The base system then forces a system reset.5. When the unit comes back up, the base system detects a configuration thatis now invalid and creates a default configuration instead (or loads astored back-up configuration, if it is available in memory).Why is ThisDone?This process is designed to protect systems that have fatal errors that causethe system to reset before the user can get into WESMAINT to fix theproblemWhile a user can always directly default the configuration by pressing during the start-up sequence, this only works if the customer is physicallypresent and connected to the WESMAINT port.Since the D25 has the ability to receive files remotely over a LAN, theproblem may occur when a user is downloading remotely and logging in overTELNET. An error that causes the system to constantly reboot couldpotentially continue forever, filling up NVRAM with many error messages.This process enables the D25 to eventually settle down on its own.When to Erasea ConfigurationRule: If the code file is not exactly the same as the one that was in usebefore the download, then erase a configuration file from the D25’sNVRAM before downloading a new code file into FLASH memory.