13
and making sure that the entire gate system meets all
applicable electrical codes.
Refer to Figures 14 and 15 if your operator has the 844
B/C control panel, and refer to Figures 16 and 17 if
your operator has the 844 MPS control panel.
Connect your 220-VAC power source to your control
panel. For the 844 B/C, connect the power source to
terminals 16 and 17 (see Figures 14 and 15). For the
844 MPS, connect the power source to terminal block
J8 (see Figures 16 and 17). For either control panel,
connect the ground wire from your power source to the
grounding lug (brass) toward the front of the open 844
Operator.
Connect an activating device to terminals 1 and 2 on the
844 MPS panel or terminals 1 and 4 (for open) and 2
and 4 (for close) on the 844 B/C panel. The activating
device must be normally open to operate. It
momentarily closes to activate the operator.
Setting Up the
Limit Switches
WARNING!
Turn the main power off before you
make any electrical connections or set any switches
inside the cover of the 844 Operator.
The maximum travel of the gate when it opens and
closes is controlled by inductive limit switches (see
Figures 11 and 12). While the limit switch plates are
mounted on the rack or chain, the limit switch sensors
or triggers are part of the 844 Operator itself (see
Figure 1).
Setting up the limit switches entails (1) mounting the
limit switch plates on your rack or chain, (2) connecting
the limit switch sensor to the control panel, and (3)
checking your limit switches for correct mounting.
Mount the Limit Switch Plates, General Principles:
The 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
each end of the gate leaf (see Fig. 11). In the case of the
chain drive, they are fixed to the top of the chain on
each end of the gate leaf (see Fig. 12). For either drive,
the distance between the plates and the limit switch
located on the gate side of the 844 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 allows for braking.
WARNING!
Turn the main power off before you
make any electrical connections or set any switches
inside the cover of the 844 Operator.
Mount the Limit Switch Plates, Actual Mounting
: To
mount the limit switch plates, first disengage the
operator’s motor with the Manual Release and then
fully open the gate by hand.
Between the gate leaf and the operator, hold one plate in
your hand just above the rack or chain on the closing
gate post end 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.
Limit
switch
trigger
Limit
switch
plate
Limit
switch
Figure 11. The limit switch assembly for a rack
and pinion assembly
Limit switch
Limit switch trigger
Limit switch plate
mounted on the chain
Figure 12. The limit switch assembly on a chain
drive installation
Watch the control panel light-emitting diodes (LEDs).
The point where the FCA light (or Open LED) on the
control panel goes out is the triggering point of the limit
switch. You need to continue moving the limit switch
plate 1-3/4 in. (45 mm) farther in the gate’s opening
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