Pw9120-6000 I have a Powerware 9120 that shows 255VCD in battery charger... What causes this error? All battery are new.

A Powerware 9120 2000 is an uninterruptible power supply (UPS) device that provides power backup to connected devices in case of power outages or other power issues. If the UPS is shutting down at 50% charge and showing low power alarm, there could be several possible causes:

1. The battery is failing: The UPS is designed to shut down when the battery charge reaches a certain level to prevent damage to the battery. If the battery is failing, it may not be holding a charge and may need to be replaced.
2. The battery is not compatible: Make sure that the battery you are using is compatible with the Powerware 9120 2000 UPS. Using an incompatible battery can cause the UPS to shut down or display error messages.
3. The battery cable is loose: Check the battery cable connections to ensure that they are tight and secure. A loose battery cable can cause the UPS to shut down or display error messages.
4. The UPS is overheating: Check the UPS for any signs of overheating, such as a hot feeling on the top of the unit or a burning smell. An overheating UPS can cause the UPS to shut down or display error messages.
5. The UPS firmware is outdated or corrupted: Check to ensure that the UPS firmware is up to date and not corrupted. Outdated or corrupted firmware can cause the UPS to shut down or display error messages.

If none of these solutions solve the problem, it's recommended to contact the manufacturer or a professional technician for further assistance. They will have the knowledge and expertise to troubleshoot and diagnose the issue with your Powerware 9120 2000 UPS.

Be more specific. Exactly what do you see?

Suspect charger board failure. Replace with new model 9130. 9120 is obselete

The charger in powerware 9 series 9120 6000i ,the fan is of a quality that it fails and the heat sink does not get sufficient cooling ,it runs on 12 volt ,i replaced it with a cpu fan from a mainboard on a pc and it works perfectly now. make sure that the fan is running else the charger might go in protection or can fail due to the transistor on heat sink fails.

check your batery, may it was leaked, change it with new battery

did u check the fuse inside the ups?
did the ups gave the error right after u replace the batteries? or some time after.
sometimes gives the message some time after and its because the charger isn´t working properly. the charger is a spare board in the 9120, 5 and 6 KVa.
good luck

You can download the manual and other literature at
http://www.powerware.com/EMEA/UPS/9120_info.asp

The contacts for support in India are found at
http://www.powerware.com/India/Service_Support/IN_Office_Contact.asp

They offer a battery monitoring software package, at
http://www.powerware.com/India/Service_Support/IN_Battery_Services.asp

You can email support at http://www.powerware.com/pp/Check.asp?key=code1
Good luck

sounds like inverter is unhappy(causing the input fuse to blow. maybe, just maybe, this Powerware 9120 has given up the ghost? The inverter can short for a variety of reasons. Try to take out the battery completely, and run it as just a power conditioner. If that works, then you have an unhappy inverter in there.

sometimes the battery tester is not enough to check the battery. battery also prone to tear and wear.because of charging ang discharging. replace the battery