Dir,sir my name is elsayed khatab working in power station my work depend on ups model ''400-cyberexwave'' but i have a problem when loading ups by select position bypass ,when i loading rectifier from control enable from LCD touch screen a set point for output of rectifier is270 LCD but by measuring on positive and negative of rectifier inside ups a value is 135v and rectifier in this case is out by signal rectifier out put voltage high and inverter not loading , please answer me about this problems and thank you.

I asked some clarification questions, but received no answer.

Because I see that your question is still standing, I will try to help you, but I am not sure, because I did not have your answers.

Your inverter I think is not CyberPower, but Thomas & Betts.
Your UPS has internal battery, which depends upon the type of the UPS.

If your battery is 270 V DC (which means 20 x 12 V batteries) 135 V will not be enough to charge them. But if you have 135 V DC (which means 10 x 12 V batteries) you can not give to them 270 V, because you can spoil them.

That's why you should measure the voltage on the batteries, not at the rectifier.

1. If the batteries have the correct voltage for their number 135 for 10 batteries you can not adjust it to 270, you should adjust 135.
2. If it is 270 for 20 batt's your rectifier did not get your order.
3. If it is lower then the number of batteries multiplied by 11 V you may have a bad battery or completely discharged batteries and you need to charge them outside the UPS by other charger (One by one or in series) until their rated voltage is reached.
4. Some of your internal breakers may not function well.