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22
Gate Behavior
During Closing
Switch 4
Gate immediately
reverses its direction
when a reversing device
is triggered
off
Gate stops and reverse its
direction when reversing
device is no longer
triggered
on
Switch 5 (Reversing Stroke):
Sometimes electric locks
require a reversing stroke to disengage the lock. If your
gate does not always open because your lock is hanging
up, you may want to activate the reversing stroke.
Reversing Stroke
Switch 5
Not activated
off
Activated
on
Adjust the Potentiometers
The four potentiometers control the torque, the pause
time, the opening/closing time of operation, and the leaf
delay for closing.
Torque:
The torque potentiometer on the 450 MPS
must
be turned all the way clockwise for the 760
Operator. The potentiometer controls voltage to the
operator. It is used for the FAAC model 412, a screw
drive operator. The torque potentiometer
cannot
be
used to adjust the operator’s hydraulic operating
pressures.
Caution
: Failure to turn the torque potentiometer to
maximum in the clockwise direction jeopardizes the life
of the motor of your operator.
WARNING
! Adjust the operating pressure on the 400
Operator only by means of the hydraulic bypass valve
screws. See pages 15 and 22.
Pause Time:
The pause (time gate stays open) can be
adjusted from 0 to 240 seconds. Turn the potentiometer
clockwise to increase the pause time and
counterclockwise to decrease the pause time.
Opening/Closing Time:
The opening/closing time is
adjustable from 10 to 62 seconds. The approximate
opening/closing time for a 90-degree opening varies
from 12 to 17 seconds, depending on the model. Turn
the potentiometer clockwise to increase the time and
counterclockwise to decrease the time.
For optimal operation, set the time so that the motor
remains active for a couple of seconds after the leaf has
reached its positive stop for opening and for closing.
Leaf Delay:
You may choose to delay one leaf on
closing for overlapping gate leaves. Be sure the operator
on the leaf for delayed closing is connected to Motor 1.
On opening, the leaf connected to Motor 2 is delayed
2.5 sec.
Note
: You cannot adjust this opening delay of the
operator connected to Motor 2. However, you can turn
off the delay by closing the jumper labeled “Open Leaf
Delay Disable” on the 450 MPS.
The closing leaf-delay time is adjustable from 0 to 28
seconds. Turn the potentiometer clockwise to increase
the time and counterclockwise to decrease the time.
Note
: In one-leaf gate designs, be sure to set the
potentiometer for leaf delay to its minimum (0 seconds).
Note
: If the opening/closing time is set at less than the
leaf delay time, the delayed leaf closes at the end of the
closing time.
Fine-tune the Bypass
Valve Pressures
The pressure a gate leaf applies to an obstacle in its path
is determined by the bypass valve adjustment. The
safety standards of FAAC International, Inc.,
recommend that the gate should stop when it meets with
a force of more than 33 lb (15 kg).
WARNING!
The pressure valves may operate the gate
leaf with enough force to endanger people and seriously
damage the gate leaf itself. Increase the pressures in
small increments (1/4 turn), and set the pressure
adjustments at the
minimum
level necessary for the
gate's operation.
Which bypass valve screw controls the opening thrust of
the gate and which the closing thrust depends on the
orientation of the unit in your installation site. The green
screw always controls the clockwise rotation of the
splined shaft, and the red screw always controls the
counterclockwise rotation of the splined shaft.
Fine tune the pressures for both opening and closing
after you have installed the control panel for the 760
Operator. Set the pressures at the
minimum
necessary to
open or close the gate leaf.
Note
: The red and green screws are not a speed
adjustment. The motor speed and pump displacement
are constant.
Summary of Contents for 760
Page 20: ...20 Figure 22 Common accessories wired to 450 MPS...
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