Correct, on start up (as you turn the key/ press the button in RII) the blades turn. As the engine lights, before you throw the brown guard switch, the blades will be turning about 1 rev per 2 secs.
I'm told that this is normal and expected (the engine likes load). Older machines (& I recall most of the Astros I ever flew) this did not happen.
I've just had a new clutch actuater fitted (the springs lost springiness on the original) and the blades noticably turn more as it is new (engineer says this is fine too).
Check with your engineer if uncertain or if the clutch is not disenganging correctly. 50 to 62 seconds on the timer from switch to clutch light on depanding on usage.