LiftMaster BG790 BG790 Manual - Page 3

SPECIFICATIONS MOTOR Squirrel cage induction type (3 phase) or capacitor start induction type (1 phase), continuous duty, 1725 RPM. Horsepower is designated by second suffix of operator part number. -50; 1/2 Horsepower POWER Line voltage is designated by third suffix of gate part number. For amp draw, see motor nameplate. -11; 115Vac, 1 Phase, 60Hz -21; 230Vac, 1 Phase, 60Hz -81; 208Vac, 1 Phase, 60Hz -83; 208Vac, 3 Phase, 60Hz -23; 230Vac, 3 Phase. 60Hz -43; 460Vac, 3 Phase, 60Hz -53; 575Vac, 3 Phase, 60Hz ELECTRICAL OVERLOAD PROTECTION Automatic reset (3 phase operators) or manual reset (1 phase operators) thermal overload. ELECTRICAL BOX NEMA 1 general purpose painted steel enclosure, contains all motor control equipment. Enclosure removable from operator. CONTROL CIRCUIT Class II, 24Vac LIMIT SWITCHES Adjustable, driven limit switches, operate in class II circuit. Not affected by removal of motor. POWER ON/OFF SWITCH Enclosed toggle switch, HP rated. OPERATION Prewired terminal strip accepts field connection of any access control device with normally open (N.O.) output contact (most access control equipment) and when required, a separate OPEN/CLOSE pushbutton (provided). Plug-in connectors are included for addition of a loop detector to open and/or a loop detector to hold open (not provided). Activation of access device open button, or loop detector to open will raise gate. Gate will lower automatically unless hold open loop detector is activated or unless CLOSE button wiring has been made, in which case gate will remain open until CLOSE button is pushed. An optional timer will extend the time that the gate remains open. AUTO/MANUAL switch holds arm in vertical position. ENCLOSURE Weatherproof, heavy gauge, pregalvanized steel, powdercoat finish, top and side access covers with key lock. MECHANICAL SPEED REDUCTION Wormgear-in-oil-bath, 60:1 ARM TYPE MODEL BG770: One piece type to 15' MODEL BG790: Counterweighted wishbone type to 24' ARM SPEED MODEL BG770: Opens in 4 seconds MODEL BG790: Opens in 11 seconds LUBRICATION Permanently lubricated bearings in motor. Low temperature gear oil normally never needs replacement. Gear oil is Mobil SHC 630 or equivalent. MOUNTING Pad mount Model BG770 17" 17" Up to 15' DIMENSIONS 35" 44" Model BG790 Counterweighted 17" Wishbone Arm 17" Up to 24' DIMENSIONS 22" 44" 35" Typical Installation Typical Installation 3