Without a datasheet or even a schematic of a similar circuit, my supposition (based on comments) is that the input end is a coil of wire, and this will burn out eventually with too much voltage and therefore too much current, but may be tolerant for a short time.
Are you sure the beeping is coming from the Bruno stairlift? You’d be surprised how many times we go out on service calls to address a beeping Bruno Elan, Elite or Curved Stairlift, only to find that it’s time to replace the batteries in the smoke alarm or CO2 detector, or identify the source as the microwave or another appliance.
In amps with two wire cords, defects of the "ground reverse" switch and/or capacitor can cause hum. A leaky power transformer can also cause this. It's especially bad when the ground reverse mess is already dicey. Induced hum Placement of the amplifier near other equipment can sometimes cause it to pick up radiated hum from other equipement.
Remember, the secondary of these transformers receive their voltage from the primary windings (not shown in Figure 1) Single-phase voltages can be picked off the secondary of the Delta transformer.
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