Model MHS is an Medium-Duty Logic slow-speed hoist operator for rolling sheet doors. It features a high-starting torque motor with overload protection, adjustable friction clutch, a compact design, and an emergency chain hoist with an electric interlock.

MEDIUM-DUTY LOGIC TECHNOLOGY
Added Value

• Medium-Duty Logic programmable integrated circuit board
• Built-in 3-channel, 315MHz radio receiver accepts up to 20 Chamberlain® Security+® or unlimited DIP switch remotes.
  3-button remotes can be programmed for OPEN/CLOSE/STOP operation
• Programmable B2 or C2 wiring options
• Integrated Timer-to-Close (TTC) allows programming from 5 to 60 seconds (CPS®-L or CPS®-LN4 photo-eyes required)
• Integrated 90-second maximum run timer
• Monitored entrapment capability
• Enhanced protection against transient overvoltage conditions
• 3-button control station included

STANDARD FEATURES
Motor: Powerful 1/2 HP, 115V single-phase motor with instant reverse, capacitor start and overload protection. Removable without affecting limit switch settings.

Drive Reduction: First-stage heavy-duty 4L V-belt; second and third stages #48 chain.

Emergency Manual Operation: Easy emergency manual operation using a floor level disconnect or an electrically interlocked chain hoist mechanism.

Operator/Motor Control: Solid-state Medium-Duty Logic circuit board.

 

Control Circuit: 24V NEC Class 2.

Wiring Type: All operators are factory preset to C2 wiring, providing momentary contact to open and stop, with constant contact to close. Momentary contact to close (B2 wiring) can be easily set with the push of a button. The operator is pre-wired to accept CPS®-L/CPS®-LN4 photo-eyes or a sensing edge.

Radio Receiver & External Radio Control Terminal: 315 MHz radio receiver is integral to the Medium-Duty Logic board. Accepts up to 20 Security+® remote controls and unlimited DIP switch remote controls. External terminals provide quick, convenient connections for retrofitting or adding radio controls.

Bushings: Heavy-duty oil-filled bushings.

Friction Clutch: Adjustable, helps protect against major damage to door and operator should the door meet an obstruction.

Construction: NEMA 1 type electrical box, heavy-duty 11-gauge steel frame with durable powdercoat finish, all reduction sprockets drilled and pinned to shafts.

Push Button Station: 3-button station for OPEN/CLOSE functions is standard for all operators. Controls with 1, 2 and 3 buttons are available.

Warranty: 2-year warranty.


CONTROL ACCESSORIES
CPS®-L Commercial Protector System®: (recommended) A "non-contact" photo safety sensor designed to sense an obstruction and signal the door operator to reverse to open.

Sensing Edge: (recommended) Designed to sense an obstruction and signal door operator to stop or reverse upon contact. An electric or pneumatic sensing device can be added to bottom edge of door.

 

Radio Control: Universal remote controls and receivers are available to signal the operator to open, close and stop.

 

Rolling Door Interlock Switch: Disables the operator control circuit when a manual door lock is engaged, preventing damage to the door and operator.

 

Wireless Access Control Devices: Weather-proof single- or 3-button wireless control stations are available and compatible with the Medium-Duty Logic on-board receiver. In addition, a choice of either a 5- or 250-code wireless keypad is available. Wireless controls should be used to supplement hard-wired controls and should not be used in place of such controls unless a sensing device, such as photo-eyes or a sensing edge, is present.