N4GT503L5 NEMA 4 Gearhead Trolley Operator 1/2HP, 230/460 V AC, 3 Phase

Logic 5.0 gearhead trolley commercial door operators employ lubricated gears and are optimal for heavy industrial, high-cycle applications. Suspended from the ceiling, the door operators are used on sectional overhead doors with standard lift. GT operators are directly attached to drive and control the door.

Nema 4 Watertight / Oiltight / Dust-Tight Modification (M103)

• Provides more complete protection against water spray, oil and other fluids than the Damp Environment Modification (M102). Includes a TEFC motor (M100), Watertight/Oiltight Control Enclosure (M101), Watertight/Oiltight 3-Button Control Station, nickel-plated chain and a Dynamic Brake replacing the solenoid brake. See (M5) Dynamic Brake Modification for a description of this brake. This allows the brake to also be contained in a Watertight/Oiltight Enclosure. A Delay-on-Reverse Circuit (M60) is included with this modification. Must be factory installed. 
• IMPORTANT: Must identify handing of drive sprocket and hoist.
• NOTE: All door operators with this modification include CPS-UN4 Photo Eyes. 

Connectivity

• MyQ® Technology enables you to securely monitor and control your facility door operator and lights with your smartphone, tablet, or computer for greater peace of mind.
• Alerts can be received as email or pop-up (push) notifications.

Performance

• Heavy-duty worm-gear-in-oil reducer delivers performance for heavy industrial, high-cycle applications.
• Control function selector dial allows for easy selection and programming of seven wiring types—from constant pressure to close to specialized Timer-to-Close functionality—to meet end user needs.
• Timer-to-Close conveniently and confidently closes the commercial door automatically after a predetermined amount of time has elapsed for added security and peace of mind.
• Mid-stop enables partial opening of the door to a preprogrammed position for energy savings, time savings, and convenience.
• Dual voltage connections increase flexibility by enabling the installer to select the required voltage within phase to meet job-site requirements. Within phases, voltage is selectable at the time of installation with the placement of a connector.
• Continuous-duty high-starting torque motor with instant reverse and overload protection. Capacitor start with single phase, removable without affecting limit switches.
• Adjustable friction clutch helps protect the door and operator from damage should the door meet an obstruction.
• Maximum run timer reverses or stops the door if closing time exceeds the expected time frame to limit damage to door and operator.
• Delay-on-reverse circuit prevents abrupt reversal of the door, reducing wear on the door and operator system.
• 3-Button Control Station with Maintenance Alert System (MAS).
• Drive reduction: 10:1 first stage using heavy-duty gears running in oil bath, cast-iron housing; #41 chain second stage; #41 output chain on trolley.
• Bearings: sealed roller bearings in gear reducer; flange-mount industrial ball bearings on drive shaft.
• Brake: standard on all GT operators.
• Construction: NEMA 1-rated electrical box, heavy-duty 11-gauge steel frame with durable powder-coat finish. All reduction sprockets drilled and pinned to shafts.
• #41 trolley roller chain standard on GT operators.
• Door speed: 6–7 in. per second.
• Warranty: 2 years.

Safety

• Security+ 2.0™ radio receiver is standard on-board with Logic 5.0 operators and virtually eliminates radio frequency interference.
• Accepts up to 90 one-button or 30 three-button remote controls, plus up to 30 wireless keypads or an unlimited number of DIP switch remote controls.
• LiftMaster® Commercial Door Operators comply with UL 325 standards.
• LiftMaster offers a variety of entrapment protection devices for every commercial application.
• Emergency Disconnect disconnects the door operator from the door for manual lifting in an emergency.