Re: UPS not accepting power from new generator
It sounds like this is what is happening:
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- <font size="2" face="Verdana, Helvetica, sans-serif">You turn off the main power, so the UPS goes into battery mode.</font>
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- <font size="2" face="Verdana, Helvetica, sans-serif">The generator starts up and becomes ready to take load.</font>
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- <font size="2" face="Verdana, Helvetica, sans-serif">The UPS sees the power as being available, and transfers to on-line mode.</font>
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- <font size="2" face="Verdana, Helvetica, sans-serif">The generator receives a nearly full load all at once, and goes through its loading transient. Frequency and voltage will dip, until the governor and voltage regulator have time to react and to correct them back to normal frequency and voltage.</font>
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- <font size="2" face="Verdana, Helvetica, sans-serif">The frequency dip or the voltage dip or both are severe enough for the UPS to see a loss of its AC power source. It then transfers back to battery.</font>
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- <font size="2" face="Verdana, Helvetica, sans-serif">That unloads the generator, which (after another short transient) will return to normal frequency and voltage.</font>
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- <font size="2" face="Verdana, Helvetica, sans-serif">The UPS will then see that the AC source is available, and go back to online mode.</font>
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- <font size="2" face="Verdana, Helvetica, sans-serif">And around the circle we go again.</font>
<font size="2" face="Verdana, Helvetica, sans-serif">It sounds like you need to look into the reaction times of the governor and voltage regulator, and see if you can reduce the dips associated with generator loading to within the UPS requirements for input power.