Specifications; Operator Specifications; Operator Dimensions - Chamberlain LiftMaster Professional BG770 Owner's Manual

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
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.
Model BG770
Up to 15'
DIMENSIONS
Typical
Installation
S P E C I F I C A T I O N S
MOTOR
17"
17"
44"
35"
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.
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 BG790
Counterweighted
Wishbone Arm
Up to 24'
DIMENSIONS
Typical
Installation
3
17"
22"
17"
44"
35"