Your active pass would not be applicable towards any Pay Per Ride campaigns as long as you still have pass minutes remaining for the current day.
Should you run out of minutes midway through a trip started within a Pay Per Ride campaign period, the remaining trip time will be eligible for the relevant Pay Per Ride discount.
The only time where your trip time will not be deducted from your Pass’s daily free minutes is when a Pay Per Ride campaign is offering free rides and your trip falls within the campaign timeframe.