7
who want to signal the gate to open and signal the gate
to close. For example, one input signal makes the gate
open, and it remains open until another input signal is
received, when the gate closes.
The system has been optimized to provide maximum
safety and to protect users against the accidental
pressing of an activating device while the gate is in
motion. Thus, if the gate is opening, an input signal
stops the gate and another signal is necessary to close it.
If the gate is closing, on the other hand, an input signal
reverses the gate’s motion, causing the gate to reopen
immediately.
If additional reversing devices are installed on the gate,
they do not alter this operational logic with the
following exception: If there is an obstacle in the path
of the gate during opening and a signal is sent, the gate
movement stops. However, if a reversing device is
activated and if a second signal is sent to the operator,
the gate continues to open rather than to close.
A1 (Automatic) Mode
Available only on the 844 MPS control panel, the A1
(automatic) mode is designed for users who want the
gate to automatically close after a preset pause time.
One input signal opens the gate and then automatically
closes the gate after the pause time has elapsed.
An open signal has the following effects:
•
If an open signal is sent while the gate is
opening it is disregarded.
•
If an open signal is sent during the pause
phase, the pause count is reset to 0 or 5 sec,
depending on whether preflashing of the
warning light has been selected with DIP
switch 6.
•
If an open signal is sent while the gate is
closing, the gate reverses and immediately
reopens.
S1 (Security) Mode
Available only on the 844 MPS control panel, the S1
mode of operation is similar to the A1 mode with
following exceptions:
•
If an activating signal is sent while the gate is
in its opening or pause phases, the gate closes
immediately.
•
During the pause phase, a triggered reversing
device holds the gate open. Then 5 sec after the
device is no longer triggered, the gate closes.
S2 (Security Plus) Mode
Available only on the 844 MPS control panel, the S2
mode of operation is similar to the S1 mode with
following exception:
A triggered reversing device during the pause
phase interrupts the pause count until the
device is no longer triggered. When the device
is no longer triggered, the pause count begins
where it left off.
Manual Release Mechanism
The Manual Release mechanism is used during
installation, when no electrical power is available, or
during emergencies.
To use the Manual Release mechanism (see Figure 2),
lift the lock cover and insert the key. Then rotate the
key in the clockwise direction and pull the Manual
Release lever out as shown in Figure 2. This disengages
the operator motor from the pinion or chain.
Now you have to move the gate by hand to open it or
close it. Also, the gear reduction of the final drive is
deactivated, so the gate will not lock in a closed
position.
To re-engage the operator motor for normal operation,
close the Manual Release lever, turn the key counter-
clockwise and remove it, and shut the lock cover.
(a)
(b)
Figure 2. To use the Manual Release, (a) lift the
lock cover and insert the key; (b) then turn the
key clockwise and pull out the Manual Release
lever as shown.
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Summary of Contents for 844
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