PWR-01 series turns off the output soon after the output is turned on and shows “AL/oUP” on the panel. What should I do?

“oUP” means an overvoltage protection (OVP), so the OVP function is activated.
Set the OVP value higher than the output voltage.
You can also limit the output voltage not to exceed approx. 95 % of the OVP trip point from the CONFIG setting (CF23).