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Operator Information


Service Doors, Insulated Doors

Note: UL325 Standard requires covering moving components of all exposed motors mounted at or below 8 feet in height. Cornell's UL325 Compliance Recommendation

Sensing Edges Options for Cornell Doors Document

Models MG: cULus listed, industrial duty gear head operator rated for a maximum of 20 cycles per day. Totally Enclosed Non-Ventilated (TENV) motor. Factory pre-wired motor control terminals. Maintenance free, solenoid actuated brake. Motor mounted interlock available to 1/2 HP. Auxiliary manual chain hoist for emergency operation or provisions for auxiliary push-up operation. Auxiliary chain hoist safely cuts operator power when engaged: just pull to operate. Overload protection. Lubricated, heavy-duty gears. Compact operator / mounting configuration. Fully adjustable, driven linear screw type cam limit switch mechanism.

Cycle Rating: rated for a maximum of 20 cycles per day.
HP: 1/3, 1/2, and 3/4
Volts: 115, 208/230, 460 and 575.
Available for all units up to 3/4 HP rating that will routinely cycle up to 20 times per day.
Model MG Data Sheet

Model MG Installation Instructions \ Wiring Diagrams

Model SG: cULus listed, super duty gear head operator designed for continuous use. Totally Enclosed Fan Cooled (TEFC) motor. Factory pre-wired motor control terminals. Maintenance free, solenoid actuated brake. Auxiliary manual chain hoist for emergency operation provided up to 2 HP as standard. Auxiliary chain hoist automatically engages when motor is not energized: just pull to operate. Overload protection. Lubricated, heavy-duty gears. Compact operator / mounting configuration. Fully adjustable, driven linear screw type cam limit switch mechanism.

Cycle Rating: designed for continuous use.
HP: 1/2, 3/4, 1, 1 1/2, 2, 3, 5 and 7 1/2 HP operators are available.
Voltage: 115, 208/230, 460 and 575. Sizes above 3/4 HP should be 3 phase.
Recommended for all rolling doors, including high cycle units operated more than 20 cycles per day.
Model SG Data Sheet

Model SG Installation Instructions \ Wiring Diagrams

Components and Accessories Available.

Visit LiftMaster.com for more information regarding LiftMaster® motor operators and electrical products.


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24 Elmwood Ave., Mountaintop, PA 18707 | Tel 800.233.8366 | Fax 800.526.0841 | Email cornell@cornelliron.com

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