Powerware 9120 ups high output voltage massege

SOURCE: Powerware 9120 DC Bus Fault Problem.

there is a 100uf/63v capacitor near the IRF630 fet. You need to replace this in order to fix this error. Along there is also a 2200uf/16v capacitor. It is a good idea to change the both at the same time.

SOURCE: Powerware 9120. 1500i UPS

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

SOURCE: Powerware 9120

Greetings!
How many years is your ups working? UPS is usually run by a battery, some of them are disposable and needs replacement. If it does not charge anymore it needs replacement of battery.
Thanks.

SOURCE: Powerware 9120 BUS Unbalanced error display

I've had this same issue what it boils down to is that the Power IN is not being distributed properly across the Power Outlets.

Step 1. unplug everything from the unit and power the ups down. If the alarm clears itself the UPS is mostly likely fine. if it doesn't not clear send it in for repair

Step 2. If step 1 cleared the alarm try distributing the decives across the outlets differently.

There are two inverters so two output if everything is plugged into one side (ie a power bar with 10 things plugged into it) and nothing on the other side this could cause the alarm.

hope this helps

SOURCE: my ups has is faulty i need a circuit diagram to fix it

I had a DC bus fault error displayed.

So I unplugged battery, then turned on UPS. It said Batt disconnected of course.

So when I plugged in the batt while the UPS was on, and held the power button for a few sec, the UPS displayed Batt testing.

After a few moments it was back online and had no faults!

Worth a shot.