If a controller includes regenerative braking, then there is a potential problem if a battery connection fails during braking. This can happen on a golf buggy if the batteries are not properly secured! If it happens then the controller will automatically increase the regenerated voltage in an attempt at regenerating braking energy into a missing battery. If the regenerated voltage is not clamped in some way then the regenerated voltage will simply rise until something fails.
Of course with a disconnected battery all control is lost.
This feature limits the regenerated over voltage and is fitted on all controllers having regenerative braking.
Generally its level is limited by what the MOSFETs can handle, so it's set to 47v on 12v, 24v and 36v controllers (which use 55v MOSFETs) and 68v on the 48v models (which use 75v MOSFETs)
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