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Why cannot run self-test on Powerchute Personal Edition (PCPE) for Back-UPS?

Why cannot run self-test on Powerchute Personal Edition (PCPE) and the status shown "unable to carry out the self test at this time"

Please find the possible reason such as follows:

1. Not fully charge the battery or not reaching the expected battery charged
2. UPS experiencing intermittent connection with the battery
3. Sudden input fluctuation/variations such as sags, spikes, or distortion during that time
4. UPS was still in establishing the memory or even the switching signal inside the circuitry after the first event of self test we expect a little bit decrease of voltage and current on the part of internal battery even it will consume a short period of time of switching to battery.
 
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