Have you checked the Fundamentals Configuration Guide for HPE 5500?
Speaking about scheduling jobs, if periodic schedule is supported for sure you will find reference there.
When defining the scheduler schedule, in the case of periodic schedule, instead of define the non-periodic schedule via time at, time once at or time once delay, you should be able to define the periodic schedule via time repeating at or time repeating at interval.
Look at "Scheduling a task", if any.