LiftMaster BG770 Industrial-Duty Single Arm Barrier Gate Operator - Manual (Page 11)

11
LIMIT SWITCH ADJUSTMENTS
CLOSE LIMIT SWITCH
The CLOSE limit switch is preset at the factory. If you rotated the
pulley in section Arm and Turnbuckle Shaft Adjustments, you will
need to reset the cam on the CLOSE limit switch.
1. Loosen the set screw on the cam. Then rotate the cam in the
close direction so that the switch is activated when the gate
arm is in its lowest position (Figure 12).
2. When the cam is in the desired position, retighten the set
screw. This adjustment may have to be fine tuned after turning
on power and running the unit for the first time.
AUXILIARY CLOSE LIMIT SWITCH
The AUXILIARY CLOSE limit switch is preset at the factory. If you
made an adjustment to the CLOSE cam, you will need to adjust
the cam on the AUXILIARY CLOSE limit switch also.
1. Position the AUXILIARY CLOSE cam slightly ahead of the
CLOSE cam. When the gate arm is on its down travel, the
AUXILIARY CLOSE switch will activate just before the CLOSE
switch.
2. When the cam is in the desired position, retighten the set
screw.
OPEN LIMIT SWITCH
The OPEN limit switch is preset at the factory. This setting may
have to be fine tuned after running the unit for the first time.
1. Loosen the OPEN cam and rotate in the open direction until the
switch is activated (Figure 12).
2. Retighten the cam.
I N S T A L L A T I O N
Figure 12
CLOSE
Direction
OPEN
Direction
Open Limit Switch
Close Limit Switch
Auxiliary Close
Limit Switch