You can also adjust the sensitivity of your UPS so that it will accept the Generator's supply. I had to set ours to low sensitivity to get them to work. Depending on your UPS model, you can either connect to it with the supplied USB cable and run powerchute software to set the sensitivity to low, or some models allow you to adjust sensitivity on the front panel. Good Luck!
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disconnect the input cable let UPS run on battery and check the output voltage with a true RMS voltmeter (fluke 87) if input cable is connected to main power you get the same on the output
input = output
This alarm indicates that the UPS has transferred from On Line operation
to On Battery operation. The Battery Power Supplied outlets are now
- If the input voltage is determined to be unsafe for your computer
equipment, the UPS will transfer to On Battery. The alarm will stop
once the unit returns to On Line operation. Please refer to the
technical specification section of your user manual for the acceptable
voltage window. Occasional transfers to On Battery should not be a
matter of concern, but rather, should be considered normal operation.
The UPS is trying to provide clean, safe, and reliable power. If your
unit shipped with APC management software it may be possible to change
the default acceptable voltages that the unit shipped with. Please see
the help section of the APC management software for instruction to do
- If the Frequency deviates + or - 5 % this will also cause a Back-UPS
product to transfer to battery power. Frequency distortions are most
commonly caused by generators that are undersized. Always make sure a
generator is 3 to 5 times the size of the total load attached to unsure
it can maintain a steady output frequency. There is no way to change the
+/- 5% deviation.
- If the shape of the incoming power is considered "too dirty", some
Back-UPS products may transfer to battery power. This is most likely the
problem if you have already confirmed that the input voltage is within
the acceptable limits. Most Back-UPS products have the ability to change
their sensitivity to the shape of the input power from high to medium
or even low. Please see your user manual for details as to how to adjust
If you want an Un-interruptable power supply you can call some local electronic supply stores. APC makes a model 1500 and other companies have similar models. If power goes out you can watch for 15 or 20 minutes before they go dead. They are good for stopping spikes in the line voltage also.
Those are a tough supply to fix. There are two power supplies on the board. A small switching one first starts and then when the input caps are charged a relay shorts out two large limiting resistors. Then the main power supply starts to generate the +/- used by the power amps.
When overcurrent is sensed, the supply shuts down... that is IF parts have not blown. Arcing within the power amp takes these out... the rear-most power amp arcs near the heatsink and wipes out parts there and sometimes in the power supply.
You cannot run this supply without a load on the small ofline switching supply that generates most of the smaller voltages. WARNING there are no bleeders on the capacitors on the big supply. If you don't bleed them and try to connect one of the power amps, you will get a NICE arc.
HINT: put a series light bulb like 100 Watts in series with the power input... saves fuses, the limiting resistors, transistors, etc.
Disconnect the audio line coaxes to the power amp and prop the face still connected to the supply to work on it.
The first thing is to weed out shorted transistors in the main supply (leave them out) and verify that the small supply is operating. If it is not, then likely the two sand coated limiting resistors have been blown... this is just a start on a typical repair of this.
The reason of this is the UPS cannot adopt on the frequency that is being generated by your home generator. you should use APC smart ups series coz smart-up series can work on a wider input frequency range.
With a 980watt load the run time is only 7 minutes on a brand new battery. If you have the system on full load your run time will be much less and it has likely damaged the battery. here is the APC web site page for your model. If you are running that much equipment I think you need either a bigger UPS or another 1500 and spread the load out.
Hello Dear Specialists I have a problem with the APC Smart-UPS smart 1000VA: when I insert the power plug in the wall outlet in one ups , indicate the AVR Boost ups regulating low AC voltage, when I measuring the AC city power voltage that is 207v .whey this ups is not working about the AC low voltage? ,but it should be work from (170v ~ 230v) AC input volte.please solve this problem, which element of AVR from the ups is failed or wrong and give me free circuit diagram low & high AVR and charger and inverter circuits. thanks allot
Are you sure it's not every 2 weeks? I had this problem with machines shutting down that were running on smart ups 750's. By default, these ups' run a self test every 2 weeks. Using the sofware provided with the ups (or you can download from apc) you can change the self test to 'never'.
Note that this problem only happened on machines that were running on too low input voltage.