Reset action in a controller is the integration of the proportional action by the set period. The reset action repeats the proportional action’s output per the reset time set, until the error signal becomes zero or the output gets saturated.
For example :if the reset action is set for 30 sec. For a 0.5 volt correction output ;by the proportional action will be repeated by the reset action every 30 secs., until the error signal becomes zero or the output gets saturated.