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Test outlet power by switching the unit to manual bypass and breakers off. If power is supplied OK and the filter board repaired OK then restart the unit starting with the breakers supply to unit,battery confirm the display is on and static bypass led also on then switch back the bypass knob to normal and press the on button to switch the unit to normal. Give the batteries time to charge 12hours then you can test the unit on backup mode.
Check on the back of the UPS to see if the input circuit breaker has tripped. Are you getting any lights on the front LED's? Also disconnect all loads and ensure nothing is plugged into the output receptacles. Also open UPS up and ensure the input fuse is not blown. You will need a meter to check this out.
my problem is that when connecting and switching LEDs are lit intermittently "Fault indicator" and led A and B which means (in the manual) that is a failure of input or output short circuit n electronic technician but I do not get to any way to solve the problem. excuse my English I'm Latino
Yes, is the short aswer to your question. The battery should charge as you use the ups. If they don't then its likely the battery/s have failed. Lead acid batteries do not like being left discharged for any length of time. In a motor vehicle the battery gets a bit of shaking around, but in an ups they don't. If not used and left discharged, the plates quickly sulfate up reducing the efficiency to nearly zero. Test and replace any battery that cannot support a test load, such as a bright12v light or a 12v soldering iron connected to it. The length of time required to charge the battery/s depends on their capacity (in ampere/hours) and the charging rate. A 14.4 amp/hr battery charged at say 1 ampere will take 14-1/2hrs to charge.(just as a sample)
Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. Including the number of times the unit must go on battery power and environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. If one battery is faulty in a set of batteries it will causes the whole battery system to fail and indicate a battery fault. A faulty charging circuit will not charge the batteries and will also cause a fault condition.