APC UPS for Home and Office Forum
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Posted: Monday
When turned on, the Green On-Line flashes for about 5 seconds.
Then momentarily the Yellow On-Battery comes on
Then continuous Red Overload light and continuous buzzer.
There is a Building Fault on since the outlet is 2-prong w/o ground.
However, I'm trying to test unit and have one new battery and one that is extremely weak - no load the battery pack is >26 volts.
It clearly drops out of On-Battery instantly, but does not light the Replace Battery light.
NOTE: This unit was removed from service when I measured 135v On-Battery but it may not have been a True RMS DMM.
QUESTION: I could find another battery with some life in it - I don't want to buy a new battery for a matched set only to find the unit is malfunctioning. SUGGESTIONS?
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Posted: yesterday
A True RMS meter has absolutely nothing to do with a DC measurement. ☝️ It’s near impossible you measured 135 DC volts at the battery terminal.
If you did it would be pretty apparent as to the physical condition of the battery cartridge! 🤦♂️
Regardless, there’s nothing you can do with the system without two good cells in place.
Start there and once the new battery is connected set the meter to DC (NOT) AC. Validate the system is charging the cartridge at 27.XX volts.
Let me know . . .
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Posted: 14 hours ago
The measurement is the AC output On-Battery being 135v when the line voltage is 124v. Since the output is not a sine wave, having a True RMS DMM is critical for an accurate measurement. If the meter used was not True RMS, the actual RMS voltage was greater than 135v.
The weak battery was replaced and the unit still behaved the same.
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Posted: 10 hours ago
Connect the system to a computer running APC Power Chute Software. What does the software indicate is the active fault / error codes?!?
While you’re in there update the battery installation date. Manually initiate a Self Test what does the system do or show in Power Chute / LCD Display?!?
Brain Dead: You may try to reset the internal MCU by following this procedure:
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