Owner's Manual

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
INSTALLATION INSTRUCTIONS
SETTING THE LIMIT SWITCHES
1) With the cover open on the electrical enclosure, reference
Figure 6 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.
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
A
B
C
E
G
F
D
H
10
Figure 6 - Limit Assembly