Owner's Manual

TO AVOID RISK OF ENTRAPMENT AND
POSSIBLE DAMAGE TO THE DOOR AND
OPERATOR THE LIMITS MUST BE ADJUSTED
BEFORE APPLYING POWER TO THE
OPERATOR.
WARNING
INSTALLATION INSTRUCTIONS
10
SETTING THE LIMIT SWITCHES
1) With the cover open on the electrical enclosure, reference
Figure 8 below. There are four (4) switches (A, B, C, and D)
mounted to the ‘V’ bracket (H). The limit switches are mounted
in a fixed position to the underside of the ‘V’ bracket; with the
Close Limit switch (B) on the right and the Open Limit switch (D)
on the left. The Reverse Cutout switch (A) and the Single Button
Selector switch (C, also could be Timer Engage switch depending
on the model) are mounted to the top side of the ‘V’ bracket as
shown. The switches are activated by the two limit nuts (E & G)
on the threaded shaft which move laterally along the shaft as the
operator opens and closes the door. When a limit nut nears the
end of the shaft it activates a set of switches, upper switch first
then the lower fixed limit switch.
2) Depress the Limit Nut Retention Plate (F) so it disengages
from the slots in the limit nuts and move the Limit nuts to the
center of the threaded shaft.
3) Manually raise the door to a nearly open position.
4) Depress the limit nut retaining bracket (F) so it disengages
from the slots in the limit nuts. Turn the OPEN limit nut (E) on
the shaft until it engages both the Single Button Selector switch
(C) and the Open Limit Switch (D). You will need to listen for
two audible clicks. Release the retaining bracket and be sure
that it engages in slots of both limit nuts.
5) Manually lower the door to the fully closed position and
repeat Step #3 with the Close Limit nut (G) and Reverse Cutout
switch (A) and the Close Limit switch (B).
6) Manually move the door to a half open position. With the
door in a mid position there will be time to stop the door if
something or someone were in the door path when initially
starting the door.
7) A final limit adjustment will be necessary after the
connection of the power supply in order to ensure the door stops
at the proper Open and Close positions.
8) Adjustment of the Reverse Cutout switch (A) or Single
Button Selector switch (C) is done at the factory and should not
be needed in the field. Moving the Reverse Cutout switch
closer to the center of the box will increase the point where the
reversing feature cuts out (to allow for irregularity in the floor,
etc.). The reverse cutout point is factory adjusted to approx. 4
inches off the floor.
107102
Figure 8
Limit Assembly
A
B
C E
G
F
D
H
A - REVERSE CUTOUT SWITCH
(LS4, ADJUSTABLE)
B - CLOSE LIMIT SWITCH
(LS2, FIXED POSITION)
C - SINGLE BUTTON SELECTOR
or TIMER ENGAGE SWITCH
(LS3, ADJUSTABLE)
D - OPEN LIMIT SWITCH
(LS1, FIXED POSITION)
E - OPEN LIMIT NUT
F - LIMIT NUT RETAINING BRCKT
G - CLOSE LIMIT NUT
H - “V” BRACKET