you can powerclean multiple times per week if you don't go all out. even if you do, you'll start failing reps (not pulling high enough) before you'll start seriously tiring yourself out like a max squat or deadlift would.
once your technique is good, push press weights will be noticeable higher than normal ohp because most of the work is done by the legs which are stronger. your upper body just locks out and supports the weight.
if you do powercleans on a day that includes squats or deadlifts, do the powercleans first, then move on to the slower lifts. i don't know how good your form is but make sure you are not pulling with your arms or catching with your hands, but pulling with a jumping motion and racking the bar on your delts (hands still securing it obviously). maybe your form is already awesome but you'll be wasting a lot of energy for nothing if you're doing them drastically wrong.