Model MD
Specifications

UL Listed Standard Voltages

• 1/2 HP 115Vac, single phase

Standard Features

• Rated at 12 Cycles per hour
• Driven limit switches synchronized with the door.
• Drum type solenoid actuated brake. (Optional on Drawbar units)
• Quick disconnect door arm for emergency operation. (Drawbar Units)
• Primary reduction V-belt and pulley, secondary chain and sprocket.
• Average door speed of 9.7 inches per second. (Drawbar Units)
• Track boom for doors up to 12’ high. (Drawbar Units)
• All chain carriage drive. (Drawbar Units)
• Wood runners on trolley. (Drawbar Units)
• Versatile direct coupling to hollow or solid door shaft coupling kit. (Jackshaft Units)
• Mounting brackets adjustable for either 3 ¾” or 5” shaft center line distance. (Jackshaft Units)
• Floor-level disconnect for emergency door operation (Release Model). (Jackshaft Units)
• Chain hoist with electrical interlock (Hoist Model). (Jackshaft Units)
• Output shaft speed 25 RPM for 17.3 turns between limits. (Jackshaft Units)

Standard Electrical Features

• Instant reversing motor with automatic reset overload.
• Built in electronic sensing system – automatically reverses during closing cycle.
• Dual relay control board.
• 24-volt (D.C.) three button control standard.
• Prewired to accept:

• External sensing device such as sensing edges or photocells.
• Single or three-button control stations or a combination of both.
• 3 wire radio receiver.