UPS battery low

[loadangle]

my master UPS showing battery low alarm,which is not getting reset,battery test button is also not working.but battery voltage is 430v tested by multimeter & 8 Amps load is on master UPS.few days back same problem came to my SLAVE UPS.but we done battery test & low battery alrm went away.what can be the problem in UPS or problem in battery bank.can check in details as our plant DCS is in runiing condition in.

 

[RonShap]

What voltage is the battery typically floating at? Usually a 480V UPS will have the battery float at 480V+ to be able to recreate the 480V sinwave.

Is this a large system? What does the user manual indicate regarding battery voltage?

 

[iceworm]

Not sufficient information to give you any help.
Battery type and chemistry?
Cell size?
Number of cells?
Normal float voltage?
This battery test that you did: Exactly what did you test and how did you test?

Something else not clear to me: What is the relationship between a "Naster UPS" and a "Slave UPS?

ice

Harmless flakes working together can unleash an avalanche of destruction

 

[loadangle]

we have 15 kva ups one master one slave up with 20 nos 12v ni-cd battery for each UPS.problem has been solved. one of the battery of master ups had very low voltade(internally got opened),detected during load test...replaced it..now alarm went.our power plant DCS system is supported by this UPS system.thannx to all.

but one thing is tere I would like to know..What is "rectifier error" shown in ups display during surge at input.we have to restart the ups to reset the fault.as far as I know an IC in ups ckt when gets hot then it shows rectifier fault alarm which is resetable.any ideas will be welcomed.thanx again to all.