Sectional Door Operator
Supply Powermaster Model “MT” Drawbar Operator(s)
Rated 1/2 hp, 115 volts, single phase, for use on standard lift sectional doors. motor shall be instantly reversible, permanent split capacitor type, protected from overload by a current sensing or thermal type overload device. Primary speed reduction shall be by means of an industrial duty v belt. Secondary reduction shall be by heavy duty chain and sprockets. an adjustable torque limiting clutch shall be provided to prevent overloading of operator. all shafts shall be a minimum of ¾” diameter and shall be supported by bronze bushings. a disconnect arm shall be provided for manual operation of door.
Control of the operator shall be by a class ii, 24 volt powered circuit, consisting of solid-state control board, transformer and limit switches.
All components of control system shall be ul recognized. electrical components shall be installed in a nema 1 enclosure.
A transformer shall be provided to reduce control voltage to 24 vac maximum. terminal strips shall be provided for connection of power supply line and all control devices. operator shall be wired for connection of a radio control, push button station and an obstruction sensing device without additional wiring modifications.
Control circuit shall provide instant reverse motor wiring. positive chain driven, rotary type limit switches shall be provided to limit full open and close travel of door. limit switches shall not be affected by removal of motor or by manual operation of door.
Supply Powermaster Model “GT” Drawbar Operator(s)
Rated ____ Hp, ____ Volts, ____ Phase, for use on standard lift sectional doors. primary speed reduction shall be by means of an industrial gear box with bronze worm gear in an oil bath. Motor shall be of the high starting torque, continuous duty industrial type, protected from overload by a current sensing or thermal type overload device.