Re: UPS Transformer windings
These five taps are on primary side on single winding.
These can be easily identified this way,
0V is common, Connect 220V to charging. Connect 250V to inverter out.
Deeper most is 0V.It is start of winding so is single wire. Outer most is 280V. It is end of wire hense it is single wire. Others are double because they are looped back. These can also be identified by checking resistance with a digital meter. Resitance between 0V and 190V is 2.7 ohm and it is 4 ohm between 0V and 280V.(Value for voltages and resistance are just for example. Actual may be different). Sometimes there will be 4 or 6 wires. Voltage and charging can be increased and decreased by shifting connection to nearby loop.
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