Why are there different starter limitations for dry cranking and manual start on the A320? I recently had this point clarified that when we place the mode selector to CRANK on the A320 we can dry crank the engine up to 5 mins. But the moment we place the mode selector to IGN/START then we are limited to 2 mins (I'm mainly referring to the 2 mins with regard to a manual engine start) Could someone please explain why there are these two different limitations?
Per the Airbus maintenance training manual, the crank limit whether it's dry (CRANK) or wet (IGN/START + MAN START) is 2 minutes.

An ECAM warning will notify of exceeding the limit: ENG 1 (2) START FAULT (condition: starter time exceeded).





This video shows the cranking of an A320 jet engine as a test after changing the IDG filter.