Hi Gran, >I am sure this 5K does not have the V2.0 upgrade. There is one other piece of information of interest. In the last two outages other commercial equipment also had programming problems. I have to wonder if the 5K is susceptible to low voltage. The dropping of a single phase in the transmission line often will give a low voltage like 80V instead of 120V. The Astron does not have a low voltage cut out so I could see the output voltage dropping from 13.5 to say 6 to 8 volts under load. Could this cause a corruption of memory in spite of the lithium battery? It shouldn't happen. The 5K, 6K, and 7K have similar reset and memory protection systems, which work like this: As the +5V supply drops, the processor is forced into reset first, followed a short time later by the RAM being disabled. The coin cell is switched in to replace the +5V supply as the RAM's power source. The current drawn from the cell is very low because the RAM is no longer being written or read. When power returns, the reverse occurs. As the voltage climbs, the RAM's power supply is switched from the coin cell to the +5V supply and the RAM is enabled. The processor's reset line is then released and the processor begins executing its program. If you try to run the controller under "brownout" conditions, +10V regulator will lose regulation and output a voltage that is lower than its input. If the +10V regulator can't supply the +5V regulator with enough voltage, and the +5V output drops by >5%, the protection system kicks in. As extra protection, if the processor ever jumps the track and fails to execute the program correctly, a watchdog circuit will notice this and reset the processor. That restarts the program. Since the 5K is quite old it's possible the RAM, the DS1232 (reset), or the DS1210 (battery manager) is bad. I suppose it's even possible that the INIT pushbutton is corroded closed so that every reset is a cold start, but you'd know this by listening to the reset message (an appended CW "C" = Cold Start). Or, the battery jumper is out, or the cell was installed reversed, or ?.. 73, Bob
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