psu? what range? what application?
you can use LM317 or something similar as constant current load.
add potentiometer and you can change the current. run it through transistor and you can
get bigger current. you can try to use big Ohmite rheostats as well.
at home or work i like to use piece of wire and short the psu output for a while.
it should not overheat and it should resume with operation once the short is removed. the only things i didn't test this way are power supplies in my PCs and little wallwarts.
no, i don't consider it abuse, this is just simulation of real life conditions psu will evetually have to endure
sooner or later and i don't want to be the poor soul stranded on site with a dead machine
because psu puked... heck, our electricians are making shorts on purpose to identify wires
(no spark = wrong one, spark = that's the one) :lol:
when Omron launched S8VS model, nobody didn't test it until equipment using it was
delivered and installed. everything was ok and ready for production when someone working
inside panel lost one wire which then touched cabinet frame. everything went dead - and stayed dead
even after he picked up the wire. everyone held the breath and scratched their head until
guy cycled main power and everything came back.
the S8VS-24024 wasn't damaged off course but this was unexpected behavior. while this is still ok
for many applications, it is not something to recommend for critical or high demand industrial equipment.
you just don't walk in and turn the power off to reset faulted power supply because this means
additional downtime due rebooting of some of equipment etc. (PLC boot in a second or two but computers
and robots are much slower, any axis with incremental encoders need to be homed etc.).