LiftMaster MGJ MGJ Manual - Page 4

OPERATOR SPECIFICATIONS MOTOR TYPE Limited Duty HORSEPOWER MGJ: 1/2 HP 1 or 3 Phase MGJ: 3/4 HP 1 Phase (only) MGH: 1/2 & 3/4Hp 1 Phase VOLTAGE MGJ: 120V, 60Hz, 1Ph 230V, 50 or 60Hz, 3Ph 230V, 60Hz, 1Ph 380V, 50Hz, 3Ph 460V, 60Hz, 3Ph MGH: 120V, 60Hz, 1Ph CURRENT: See motor nameplate The rate of operation shall not exceed 12 cycles of opening and closing per hour. ELECTRICAL TRANSFORMER 24VAC CONTROL STATION NEMA 1 three button station. OPEN/CLOSE/STOP WIRING TYPE MGH/MGJ: C2 (factory default), B2 optional LIMIT ADJUST Linear driven, fully adjustable screw type cams. Adjustable to 18 feet. MECHANICAL DRIVE REDUCTION 45:1 Reduction (Heavy duty wormgear-in-oil-bath speed reducer) OUTPUT SPROCKET Size #41 OUTPUT SHAFT SPEED MGJ: 1Ph, 23RPM 3Ph, 39RPM MGH: 1Ph, 23RPM BEARINGS Heavy duty wormgear-in-oilbath speed reducer. DUTY 12 Cycles per Hour max 50 Cycles per Day max DOOR SPEED 9" per second, typical, depending on door. MAX. DOOR HEIGHT 1/2 HP = 14' 3/4 HP = 18' SAFETY DISCONNECT Floor level disconnect for emergency manual door operation. 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. 4