UPS OUTPUT VOLTAGE ISSUE

There`s two configurations that you need to check.
On UPS display, what voltaje is showing as output voltage?
There`s a chance that it is configured to 200 vac, then the transformer module will convert this to 100/200 vac.
If this is not the situation, probably the error is in the input connection of transformer module.

disconnect the input cable let UPS run on battery and check the output voltage with a true RMS voltmeter (fluke 87) if input cable is connected to main power you get the same on the output
input = output

Check the connections on the batteries. One or more may be loose or corroded. Also check the fuse for the batteries. It may have blown.

UPS will provide constant voltage out put.
The average working condition of UPS is 170 to 270 volt.
Below the level may not work.

when run on battery gives output 150 volt
but battery ok

Is there any indicator lights ON showing the fault condition?
This could indicate that the battery has a low charge. Even if you switch off the mains supply and it switches over to the battery, the UPS may shut down after a short time as the battery power (charge) runs out.
If the battery is more than 3 years old then it may be due for replacement.

when i on my ups it is indicating to fault showing a red light and giving a long beep sound and no output voltage is coming from it do i need to configure?please help me

Your battery lifespan is probably over, (3-5 Years) or the battery could have a dead cell in it, my suggestion is to replace the battery. it should be a 12 volt 7 amp hr battery or a 24 volt pack that you will have to get from the manufacturer 

Hi, You don't say whether this is under load or not but if not is within the acceptable range, which is +/- 10% . Generally speaking, voltage on a generator is not the issue but the load which it will carry, hence their wattage ratings. Measure your household voltage and you will see that it varies from day to day but usually stays within the limits and your electrical panel is rated in amperage. Hope this answers your question!