Method to detect back-feed and mis-wiring events by a UPS system

A non-transitory computer-readable medium storing thereon sequences of computer-executable instructions for operating a power supply, the sequences of computer-executable instructions including instructions that instruct at least one processor to control the power supply to:

• receive input AC power at an input of the power supply;
• provide output AC power to an output of the power supply;
• operate at least one power converter to convert the input AC power into the output AC power;
• adjust at least one parameter of the output AC power provided by the at least one power converter;
• detect, in response to adjusting the at least one parameter of the output AC power, at least one of an adjusted input AC power or an adjusted output AC power;
• and
• determine that a fault has occurred based on at least one of the adjusted input AC power or the adjusted output AC power, wherein the fault provides an indication that the input of the power supply is shorted to the output of the power supply.

A method of operating a power supply including an input configured to receive input AC power, an output configured to provide output AC power to a load, at least one power converter coupled to the input and configured to convert the input AC power into the output AC power, and at least one controller coupled to the at least one power converter, the method comprising:

• receiving input AC power at the input;
• providing, at the output, output AC power to the load;
• converting, by the at least one power converter, the input AC power into the output AC power coupled to the input;
• adjusting at least one parameter of the output AC power provided by the at least one power converter;
• detecting, in response to adjusting the at least one parameter of the output AC power, at least one of an adjusted input AC power or an adjusted output AC power;
• and
• determining that a fault has occurred based on the at least one of the adjusted input AC power or the adjusted output AC power, wherein the fault provides an indication that the input is shorted to the output.