LiftMaster MGJ Door Operator
The MGJ is a medium-duty, gear-reduced jackshaft operator designed for industrial sectional doors with high or vertical lift, as well as small rolling doors and grilles. It supports a maximum duty cycle of 12 cycles per hour and should be professionally installed by an authorized LiftMaster dealer.
BY:
Performance
- Voltage: 115V, single-phase (1 Ø)
- Drive Reduction: Heavy-duty wormgear-in-oil-bath speed reducer for reliable performance
- Control Functions: Standard three-button control station for Open/Close/Stop; options available for 1, 2, or 3 buttons
- Maintenance Alerts: Notifies when routine maintenance is required
- Durability: NEMA 1 type electrical box with powder-coated finish
- Bearings: Sealed roller bearings in gear reducer for long-lasting operation
- Mounting Flexibility: Mounts on left or right side of door; no rails required; attaches via chain and sprocket (Model 3900 can mount directly to shaft)
- Limit Setting: Adjustable limits for accurate operation, even after power failure
- Timer-To-Close: Automatic door closing with programmable increments of 1 or 15 seconds
- Warranty: LiftMaster two-year warranty for peace of mind
Safety & Security
- UL 325 Compliance: Meets all UL 325 safety requirements for commercial door operators
- Security+® Technology: Supports up to 20 remote controls and unlimited DIP switch remotes for secure access
- Automatic Safety Reversal: Signals the door to reverse or stop if closing time exceeds maximum travel, preventing damage to the door and operator
- Emergency Manual Operation: Readily accessible disconnect allows easy manual operation in emergencies
- CPS-U Monitored Commercial Protector System: Provides enhanced safety and monitoring for the operator
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What types of doors is the MGJ operator compatible with?
Designed for industrial sectional doors with high or vertical lift and small rolling doors and grilles.
What is the maximum duty cycle?
The maximum recommended duty cycle is 12 cycles per hour.
Can it be manually operated during a power outage?
Yes, the operator includes an emergency disconnect for manual operation.
Is it compliant with safety standards?
Yes, it meets all UL 325 requirements for commercial door operators.
How many remote controls can it support?
Supports up to 20 remote controls and unlimited DIP switch remote controls using Security+® radio technology.
Does it have automatic safety features?
Yes, it signals the door to reverse or stop if closing time exceeds the maximum travel to prevent damage.
Can it be installed on either side of the door?
Yes, it mounts on the left or right side of the door and attaches to the door shaft via chain and sprocket.