26
DPT260
8.2 - STEP-STEP MODE
The basic configuration for an installation with automatic bollards set on step-step mode includes:
•
One or more automatic bollards
equipped with integrated
flashing light
and acoustic
buzzer
(evaluate if
flashing light and buzzer are necessary according to the configuration).
• A
control unit
equipped with radio receiver and transmitters (quantity to be defined).
• A safety inductive detector with
one or two inductive loops
.
Automatic bollards normally stand in up position to prevent transit, integrated flashing lights keep on flashing.
After giving a control by transmitter, at the same time bollards start lowering and buzzers start ringing until bollards
are completely down and allows for the transit. When bollards are in down position (the position is detected by a
sensor placed on each bollard) the control unit makes the traffic light and buzzer turns off.
After the vehicle has passed the crossing, another control is necessary for closing it again. After giving a rising
control, flashing lights and acoustic buzzers are enabled then, after one second, bollards starts rising.
If a vehicle stops close to the bollards or even over the bollards, inductive loops prevent the rising.
If another vehicle stops on the inductive loops while bollards are rising, loops interrupt the rising phase and make
bollards go back to down position.
If a pedestrian steps on a bollard during the rising phase, the safety pressure switch detects the presence of a weight
and immediately interrupts the rising phase and makes the bollards lower to down position (inversion control by
safety pressure switch).
After several inversion controls, by loops or pressure switch, bollards lower to down position and another rising
control is necessary for closing the crossing.
When the rising phase is completed, flashing lights keep on flashing, acoustic buzzers turn off and inductive loops
are temporarly excluded, as a consequence if a vehicle comes close to the crossing, bollards stay in up position to
avoid the transit (bollards lower after giving a control only).
In case of temporary power failure bollards stay in up position to prevent the transit. In case of need, manually lower
the bollards
(as described in chapter 8.1)
.
The system can be equipped with emergency rechargeable accumulators to allow the normal operation also in case
of power failure.
The operation of acoustic buzzers can be excluded at night only if the system is equipped with a timer programmer.
If bollards are installed in areas where minimum temperatures are considerable during winter, they can be equipped
with an heating resistance which avoids the formation of ice between cylinder and crown device, allowing for the
proper operation of the system.
If bollards are installed close to impluvium areas, they can be equipped with waterproof pits complete with immersion
pump for the automatic discharge of rainwater, allowing for the proper operation of the system.
UK
