Failing SPS705 power supply (68vdc Leadshine)

[john swift]

seeing its an unregulated switch mode supply
it could be a fault with the stepper motor or driver is causing the supply to protect its self

if you do open the power supply
you will find the bridge rectifier is connected across live & neutral watch out - the large capacitor may take a while to discharge the 340V DC it has across it when the mains supply is on

John

PS
do you have a 60 or 100W GLS bulb you can use as a dummy load to test the power supply ???

*GLS bulbs are old fashioned incandescent light bulbs with the tungsten filament the greens don't like