A cover assembly of a transport refrigeration unit comprising: a surround assembly having a central opening ; and a grill positionable in overlapping relationship with the central opening , wherein the grill includes a plurality of louver members and a plurality of openings are defined between the plurality of louver members , the plurality of openings being arranged in fluid communication with the central opening ; wherein the plurality of openings define an inlet area and the inlet area is variable; and wherein the plurality of louver members are movable between a first position and a second position; the cover assembly characterized by a control system including: an actuation mechanism coupled to at least one of the plurality of louver members ; one or more sensors (S) associated with the grill and configured to monitor an actual position of the plurality of louver members ; and a controller operably coupled to the actuation mechanism ; wherein the controller is configured to: communicate a movement command associated with the at least one of the plurality of louver members to the actuation mechanism ; compare the actual position of the plurality of louver members with a commanded position; determine an error value based on the comparison; and issue a corrected commanded position when the error value exceeds a predetermined threshold. a surround assembly having a central opening ; and a grill positionable in overlapping relationship with the central opening , wherein the grill includes a plurality of louver members and a plurality of openings are defined between the plurality of louver members , the plurality of openings being arranged in fluid communication with the central opening ; wherein the plurality of openings define an inlet area and the inlet area is variable; and wherein the plurality of louver members are movable between a first position and a second position; the cover assembly characterized by a control system including: an actuation mechanism coupled to at least one of the plurality of louver members ; one or more sensors (S) associated with the grill and configured to monitor an actual position of the plurality of louver members ; and a controller operably coupled to the actuation mechanism ; an actuation mechanism coupled to at least one of the plurality of louver members ; one or more sensors (S) associated with the grill and configured to monitor an actual position of the plurality of louver members ; and a controller operably coupled to the actuation mechanism ; wherein the controller is configured to: communicate a movement command associated with the at least one of the plurality of louver members to the actuation mechanism ; compare the actual position of the plurality of louver members with a commanded position; determine an error value based on the comparison; and issue a corrected commanded position when the error value exceeds a predetermined threshold. communicate a movement command associated with the at least one of the plurality of louver members to the actuation mechanism ; compare the actual position of the plurality of louver members with a commanded position; determine an error value based on the comparison; and issue a corrected commanded position when the error value exceeds a predetermined threshold. <EOS>