APC UPS Charging But Not Powering On

[Anonymous user]

please is it possible that a bad transformer can charge battery but cannot  power on the UPS instead it will vibrate the UPS, trip off and leaving all the leds blinking.

Please I need explanation on what is causing this and how to resolve it.

Thanks. 

[BillP]

what model is your UPS? 

[Anonymous user]

SU2200XL

[BillP]

if you turn on the ups on battery, it works well? 

[Anonymous user]

No it doesn't.

It cant even run self test, If it tries to, it produces a vibratory noise, goes off leaving all the LEDs blinking then the fan run for some seconds and stop. But the LEDs keep blinking till I power it off using the off button.

But its charging the battery very well up to 100%. 

[BillP]

Hi Samuel - 

All of the LED's blinking simultaneously would indicate an internal failure of the UPS. If this happens every time you try to run a self test, the UPS needs to be replaced.

[Anonymous user · Accepted solution]

I finally have gotten solution to it. I initially increased the number of mosphets but did not fill the blank capacitor space (C17 & C99) and was using the initial CT1 which is meant for 2200 meanwhile, increasing the number of mosphets has increased the capacity of the system. 

I changed the CT1 and replaced it with that of 3000, and then fill C17 and C99 with the appropriate capacitor, now the system is now up and working with my 200AH batteries. Though am yet to establish connection with the system using powerchute, where I'll carry out runtime calibration

Thanks to y'all for your contributions.