14
Settings for Warning Light
Preflashing Function
5-sec Preflashing
DIP Switch 5
Preflashing On
No preflashing
Off
Setting Up the Limit Switches
WARNING!
Turn the main power off before you
make any electrical connections or set any switches
on the control panel.
The maximum travel of the gate when it opens and
closes is controlled by inductive limit switches. These
limit switches are controlled by the wiring of blocks J3
and J4 on the control panel (see Fig. 12).
Figure 14 shows you how to connect the limit switch
ribbon cable. Where you plug in the cable
into either
block J3 or block J4
depends on the configuration of
your gate. Be sure the cable is well seated in its
receptacle.
The pair of limit switch plates furnished with the
operator activate the limit switch. For the rack and
pinion drive, the limit switch plates are fixed on the top
of the rack at either end of the gate leaf (see Figure 15).
In the case of the chain drive, they are fixed to each end
of the chain on the gate leaf (see Figure 16). For either
drive, the distance between the plates and the limit
switch located on the gate side of the 746 Operator
should be 3/16 in. (5 mm).
The limit switch plates should be positioned on the rack
or chain to enter the magnetic field of the limit switch
when the gate is still about 2 in. (50 mm) from the fully
opened or fully closed position. The 2-in. (50-mm)
distance prevents abrupt braking and avoids over
stressing the entire gate mechanism.
Do the following to mount the limit switch plates.
First disengage the operator’s motor with the Manual
Release and then fully open the gate by hand. Then be
sure the cover is removed from the operator so that you
can see the status light-emitting diodes (LEDs) on the
746 MPS control panel (see Fig. 12).
Between the gate leaf and the operator, hold one plate in
your hand just above the rack or chain on the driveway
end of the gate leaf and within 3/16 in. (5 mm) of the
limit switch. Move the limit switch plate in your hand
in the direction of gate’s opening travel.
Figure 14. The electrical wiring of the limit
switches on the 746 MPS control panel: (a)
connect the cable to J3 or (b) connect the
cable to J4
Limit
switch
trigger
Limit
switch
plate
Limit
switch
Figure 15. The limit switch assembly on a rack
and pinion installation
Summary of Contents for 746 ER CAT
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