LiftMaster MJ MJ (BLACK LINE) Manual - Page 6

ENTRAPMENT PROTECTION ACCESSORIES (OPTIONAL) SENSING EDGES All types of sensing edges with an isolated normally open (N.O.) output are compatible with your operator. This includes pneumatic and electric edges. If your door does not have a bottom sensing edge and you wish to purchase one, contact the supplier of your operator. WARNING To reduce the risk of SEVERE INJURY or DEATH, ALWAYS CAUTION install reversing sensors when the 3-button control station is out of sight of door or ANY other control (automatic or manual) is used. Reversing devices are recommended for ALL installations. If not pre-installed by the door manufacturer, mount the sensing edge on the door according to the instructions provided with the edge. The sensing edge may be electrically connected by either coiled cord or take-up reel. Refer to the steps below. Important Notes: a. Proceed with Limit Switch Adjustments before making any sensing edge wiring connections to operator as described below. b. Electrician must hardwire the junction box to the operator electrical box in accordance with local codes. WIRING: For wiring of your sensing device to the operator, refer to the wiring diagram supplied with your operator. See field connection terminals identified as Sensing Device or Safety Edge. TAKE-UP REEL: Take-up reel should be installed 12" above the top of the door. COIL CORD: Connect operator end of coil cord to junction box (not supplied) fastened to the wall approximately halfway up the door opening. LIMIT SWITCH ADJUSTMENT WARNING WARNING NOTE: Make sure the limit nuts are positioned between the limit switch actuators before proceeding with adjustments. CAUTION 1. To adjust limit nuts depress retaining plate to allow nut to spin freely. After adjustment, release plate and ensure it seats fully in slots of both nuts. 2. To increase door travel, spin nut away from actuator. To decrease door travel, spin limit nut toward actuator. 3. Adjust open limit nut so that door will stop in open position with the bottom of the door even with top of door opening. 4. Repeat Steps 1 and 2 for close cycle. Adjust close limit nut so that actuator is engaged as door fully seats at the floor. WARNING To avoid SERIOUS PERSONAL INJURY or DEATH from electrocution, disconnect electric power BEFORE manually moving limit nuts. If other problems persist, call our toll-free number for assistance - 1-800-528-2806. OPEN Limit Switch Retaining Plate CLOSE Limit Switch Aux. OPEN Limit Switch SAFETY (Aux. Close) Limit Switch 6