Overhead Door Corp. Model RDB Maximum Door Height: Varies with door coupling, 29 operator output shaft turns between open and close travel limits at standard output shaft speed of 43.1 RPM. Maximum Door Weight: 1/2 HP – 1286 lbs.; 1 HP – 1914 lbs.; 2 HP – 3468 lbs. Average Door Speed: Varies with door coupling sprocket ratio, door barrel size and door height. Standard output shaft speed is 43.1 RPM. Limit Travel: With an output shaft speed of 43.1 RPM, 29 revolutions is the maximum number of turns of the operator output shaft between the open and close travel limits. Duty Cycle: Up to 60 cycles per hour with a large constant load. Motor: 1/2, 1 or 2 horsepower, continuous duty, NEMA 56 frame open drip-proof construction, instant reversing , automatic reset thermal overload. Reduction: Primary reduction is worm gear in oil bath (40:1 standard). Secondary reduction is chain and sprocket. Clutch: Optional, adjustable torque-limiter type. Brake: Drum type, solenoid actuated. Standard on all versions. Limit System: Rotary type with vernier adjustment, synchronized with door. Control System: Heavy-duty reversing contactor, electrically and mechanically interlocked. 24 VAC three-button open/close/stop control. Constant or momentary contact door open and door close functions. Connection of sensing edge and/or photocell devices. Connection of single and/or three-button control stations. Connection of three-wire radio controls. Mounting: Jackshaft, side mount configuration (front of hood, top of hood, wall mount, bench mount types) – chain/sprocket coupling to door. Miscellaneous: Chain hoist with floor level engagement, engagement releases the brake. Electrical interlock included. Model RDB
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