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MOTOR
TYPE:. . . . . . . . . . . . . . . . . . . . . . . Continuous duty
HORSEPOWER:
Model GSD . . . . . . . . . . . . . . . . . . 1/2, 3/4, 1, 1-1/2 HP
Model SD. . . . . . . . . . . . . . . . . . 1/3, 1/2, 3/4 and 1 HP
SPEED (at rated load):. . . . . . . . . . . . . . . . . 1725 RPM
VOLTAGE: . . . . . . . . . . . . . . . . . . . 115/230V 1 Phase
208/230/460/575V 3 Phase
CURRENT (Amperage):
Voltage-Phase 1/3HP 1/2HP 3/4HP 1HP 1-1/2HP
115-1Ø, 60Hz 8.5 11.2 13.6 16 20
230-1Ø, 60Hz 4.2 5.6 6.8 8 10
208/230-3Ø, 60Hz 3 3.1 4 6 7
460-3Ø, 60Hz 1.5 1.75 2 3 3.5
575-3Ø, 60Hz 1.3 1.4 1.6 1.8 2.75
ELECTRICAL
TRANSFORMER: . . . . . . . . . . . . . . . . .24Vac Secondary
CONTROL STATION: . . . . . . . . . . . NEMA 3-Button Station
Open/Close/Stop w/LED
WIRING TYPE: . . . C2 (Standard) Momentary contact to OPEN &
STOP, constant pressure to CLOSE, plus wiring for LMEP
Device to reverse and auxiliary devices to open and close
with open override. See page 19 for optional
wiring types and operating modes.
LIMIT ADJUST:. . Linear driven, fully adjustable screw type cams.
Adjustable to 24'
SAFETY
DISCONNECT: . . . . . . . . . . . Quick disconnect door arm for
emergency manual door operation.
ENTRAPMENT PROTECTION DEVICES:
LiftMaster Monitored Entrapment Protection (LMEP)
Photoelectric Sensors (CPS-U): . . . . . . . . . . . . . . . Through beam
used to provide non-contact entrapment protection.
Edge Sensor (Optional): . . . . . . . . . . .Electric or pneumatic edge
sensor attached to the bottom edge of door.
*Monitored Photoelectric Sensors and Edge Sensors are required
for any momentary contact to close mode of operation.
MECHANICAL
DRIVE REDUCTION:
Model GSD . . . . . . . . . . . . . . . .Primary: 20:1 Heavy duty
worm gear-in-oil-bath speed reducer
Output: #41 chain
Model SD. . . . . . . . . . . . . . . . . Primary: Heavy duty (5L)
V-Belt Secondary: #41 chain/sprocket;
Output: #41 chain (1/3 and 1/2 HP)
#41 chain (3/4 and 1 HP)
OUTPUT SHAFT SPEED:
Model GSD . . . . . . . . . . . . . . . . . . . . . . . . . . 113.5
RPM
Model SD. . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
RPM
DOOR SPEED (not adjustable): . . . . . . . . 11-12” per second
BRAKE: . . . . . . Solenoid actuated drum brake on 3/4 and 1 HP
(available as an option for 1/3 and 1/2 HP)
Solenoid actuated disc brake standard on Model GSD
BEARINGS: . . . . . . . . . . . . . . . . . Output Shaft: Shielded
ball bearing
Model SD. . . . . . . . . . . . Clutch Shaft: IronCopper sintered
and oil impregnated
Introduction 4
OPERATOR SPECIFICATIONS
MAXIMUM DOOR AREA
MODEL SD
Horsepower Maximum Door
Weight (lbs.)
Maximum Door
Area (sq. ft.)
1/3 HP 750 180
1/2 HP 1300 260
3/4 HP 1850 340
1 HP 2400 480
MODEL GSD
Horsepower Maximum Door
Weight (lbs.)
Maximum Door
Area (sq. ft.)
1/2 HP 1400 300
3/4 HP 2200 420
1 HP 2800 520
1-1/2 HP 3400 620
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