Chamberlain LiftMaster BARS1 Mode D'emploi page 68

Note 1: The pace of the vehicles should be slow. All examples should be adapted to the local
situations. All of the following examples are executed without oncoming traffic.
Note 2: Not suitable for operation with trailers.
Note 3: As a third safety device it is necessary to place a Photocell under the barrier pole
Note 4: Automatic closing after a certain (preset) time is not possible with this function
Note 5: It is important to understand the Vehicle Detector Signal – function
Example 1: Entry OR Exit
• A contact loop is installed underneath the barrier and connected to the input Vehicle Detector
Signal as N/O contact (closer)
• A further loop or Photocell which is connected to the Motorcade input should be installed with a
clear distance to the first loop in front. The first vehicle of a motorcade should NOT activate both
loops simultaneously
• Description of process: one vehicle activates the immediate closing of the barrier unless
another vehicle is already blocking the Photocell (loop) transmission which has been installed
keeping some distance from the contact loop. Then the barrier stays open, as no signal can be
transmitted.
Example 2: Entry or Exit
• A contact loop is installed underneath the barrier and connected to the input Motorcade as N/C
contact (opener)
• A further loop or Photocell which is connected to the Vehicle Detector Signal input should be
installed with a clear distance beyond the first loop. The first vehicle of a motorcade should NOT
activate both loops simultaneously
• Description of process: vehicle drives over loop and underneath barrier without the control
reacting until the Photocell (loop), which has been installed with some distance from the first
loop, is activated. If there is another vehicle on the loop underneath the barrier by then, the
barrier remains open until the Photocell (loop), which is positioned beyond, is reactivated.
• VEHICLE DETECTOR SIGNAL: input for safety loop
The loop detector is connected in away as to close (NO) a relay when a vehicle is standing or
moving underneath the barrier. Effective March 2009, controls with NC contact (inverse func
tion) are also in use. In this case a jumper is factory installed in the controller. In case of closed
relay contact it is possible to open barrier but not to close it. If barrier is OPEN there will sound
a warning signal via a beeper on the control unit indicating that a vehicle is standing on the
loop. After the loop is released (relay open again) the barrier closes immediately. If a vehicle
drives onto safety loop during closing motion the barrier reverses to OPEN.
Note 1: If you wish to delay the release because barrier should not close
straight away, then this delay has to be adjusted at the loop detector (relay
drop delay).
Note2: The input can also be operated ac N/C contact
(opener) in combination with adjacent input Motorcade.
See input Special for Motorcade.
• Contact open: inactive
• Contact closed: active
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Notes