LiftMaster MJ MJ (BLACK LINE) Manual - Page 2

SPECIFICATIONS MOTOR TYPE Intermittent duty HORSEPOWER 1/2 HP SPEED 1000 RPM VOLTAGE 115V 1 Phase 60Hz, 230V 1 Phase 50Hz CURRENT See motor nameplate ELECTRICAL TRANSFORMER 24Vac CONTROL STATION: ......NEMA 1 3-button station. OPEN/CLOSE/STOP WIRING TYPE C2 (Standard) Momentary contact to OPEN & STOP, constant pressure to CLOSE, open override plus wiring for sensing device to reverse. See pages 13 and 14 for optional control settings and operating modes. LIMIT ADJUST Linear driven, fully adjustable screw type cams. Adjustable to 24 feet. MECHANICAL DRIVE REDUCTION Primary: Heavy duty (4L) V-Belt. Secondary: #48 chain/sprocket. Output: #48 chain OUTPUT SHAFT SPEED:.....80 RPM DOOR SPEED approx. 9" per sec. depending on door BRAKE (Optional Solenoid actuated disc brake BEARINGS IronCopper sintered and oil impregnated. HAND CHAIN WHEEL: .........Left or right handing Models MH and HMJ only. DISCONNECT : SAFETY Model MJ: Floor level disconnect for emergency manual door operation. Model MH: Floor level chain hoist with electrical interlock for emergency manual door operation. Model HMJ: Includes both floor level disconnect systems described above. REVERSING EDGE Optional) Electric or pneumatic sensing device attached to the bottom edge of door. A REVERSING EDGE IS STRONGLY RECOMMENDED FOR ALL COMMERCIAL OPERATOR INSTALLATIONS. REQUIRED WHEN THE 3 BUTTON CONTROL STATION IS OUT OF SIGHT OF DOOR OR ANY OTHER CONTROL (AUTOMATIC OR MANUAL) IS USED. WEIGHTS AND DIMENSIONS HANGING WEIGHT: .........80-110 LBS. 12.69" 6.34" 6.34" 6.13" 3.63" 2.91" MOUNTING DIMENSIONS A - Wall Mounting B - Bracket Mounting (rolling door) A A 18.50" 14.75" A A 7.00" 10.88" 15.78" 9.19" Hand Chain Wheel present with Model MH only. 7.00" 2