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.

MOTOR CONTROLLER SHALL BE A HEAVY DUTY, FULL VOLTAGE. ACROSS-THE-LINE, MAGNETIC REVERSING CONTACTOR, THAT IS MECHANICALLY AND ELECTRICALLY INTERLOCKED. ELECTRICAL COMPONENTS SHALL BE INSTALLED IN A NEMA 1 ENCLOSURE. A TRANSFORMER SHALL BE PROVIDED TO REDUCE CONTROL VOLTAGE TO 24 VAC MAXIMUM. SEPARATE 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.

AN ADJUSTABLE TORQUE LIMITING CLUTCH SHALL BE PROVIDED TO PREVENT OVERLOADING OF OPERATOR. A SPRING SET, SOLENOID RELEASED BRAKE SHALL BE PROVIDED AS STANDARD. THE FINAL REDUCTION AND DRIVE SHALL BE A HEAVY DUTY #41 ROLLER CHAIN AND SPROCKETS. THE DRIVE SHAFT SHALL BE SUPPORTED BY BALL BEARINGS AND BE A MINIMUM OF 3/4” IN DIAMETER.