art for instance a track assembly could be substituted for connecting arrangement 110 further still we contemplate that the body parts could be connected at one end by a connective assembly such as a journal or a hinge and by a biasing device so that the body parts form an angle between them that can be changed depending upon whether there is slack in the cable fig1 shows a cable slack compensation and control system 200 also in accordance with the present invention system 200 includes a slack condition detection and compensation apparatus in accord with the invention which apparatus has been identified by reference numeral 202 in fig1 slack detector and compensator 202 provides an input to a door drive control circuit 204 sensor switch 140 is considered part of door drive control circuit 204 because the condition of its switch 144 informs the door drive control circuit as to the tension conditions in the door cable 24 fig1 and 11 when the cable 24 is under normal tension or at least under the minimum tension that is imparted thereto by detection and compensation apparatus 202 the door drive control circuit 204 will operate the motor m in accordance with commands to open or close the door as input from user control switch panel 206 control system 200 also includes an inhibit circuit 208 for selectively inhibiting response by the door control circuit to a slack warning signal from the slack detection and compensation apparatus 202 inhibiting circuit 208 is present to prevent the door drive control circuit 200 from stopping the motor when slack temporarily is expected to be present in the cable this occurs when the door first is being lowered from its fully open position at this time slack.