I have a string of 20 batteries on an MGE Galaxy 3000. 3 of the cells tested bad on the last PM. The batteries are 3.5 years old and operate within the temperature limits suggested by the manufacturer. Should the entire string be replaced or is it OK to just replace the 3 bad cells?

If you cannot do a reset of the internal fuse system and get it operational, then check the internal battery for continuity. If they all fail, then the AC/DC transformer has blowen.

Configurations vary, do you have a model number you can provide?

If you need any UPS help contact Daniel @ Power & Systems Innovations 800.260.2259 or go to our website
www.psihq.com

No you don't have to reconfigure the UPS after battery replacement. However you may have to reset the battery Timer. There are 4 possible ways.
1. Press and hold the fault reset button for 3-5 seconds
2. Press and hold the fault reset and security key simultaneously for 3-5 seconds
3. Press an dhold the fault and alarm silence buttons simultaneously for 3-5 seconds
4. Cycle the logic Power. This means to remove power from the main processor.
5. Call MGE. They have the software to reset the battery replacement alarm

On the Galaxy display you could see what is the remaining battery life time as calculated by the software. Normally after you replaced the batteries you are supposed to reset this counter using specific software by the manufacturer. According to your information you have replaced the batteries 3 times in 5 years period. This is not normal. Nevertheless since the last replacement in 2008 it appears that the battery are now reaching the end life, which is generally 3-5 years life expectancy.

I would review the following of the assumption that the UPS is fully operational and the charging system is working.

1. Do a load test or a battery impedance test to verify the batteries are good
2. I would look at the battery life time specification, whether it is 3-5 years, 5-7 years ect.
3. Check the room temperature, every 10 degrees Celcius above 25 deg reduces battery life time by half
4. Check the number of power failures/ duration of these power failures and if possible what load were on the UPS at the time of the power failures.
I hope this will help. If all verifications are to specifications, then most likely it is a software problem

Unfortunately the reset is only possible with MGE software (Softunor).

restart the ups by to turning off your ups and main source. and turn it on again. anybe the battery u purchase is deflected. change the new battery & test again. i suggest to replace other type of battery like neuton power, chloride powersafe as this type is much reliable and cost saving. the cost of the the problem if still occur it could the setting of the UPS that it to configue.. ask the vendor to check your ups

mge galaxy 3000 battery circuit breaker shut off when normal power shut off too.plz help !!!!!!