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ENTRAPMENT PREVENTION
This vehicular gate operator is equipped with an inherent (Type A) entrapment sensing system. This
system will sense an obstruction in both the opening and closing gate cycles, and will cause the gate
to reverse direction should an obstruction be encountered. If the system detects a second obstruction
before reaching the full open or close limit after the initial reversal, an alarm will activate and the
operator will require a reset before resuming normal operation. See Section 4 for more information.
EXTERNAL ENTRAPMENT PREVENTION
Non-contact and/or contact sensors must be installed individually or in combination with each other to
provide external entrapment prevention. For gate operators utilizing a non-contact sensor:
•
See diagram below for placement of non-contact sensors.
•
Care should be exercised to reduce the risk of nuisance tripping, such as when a vehicle trips
the sensor while the gate is still moving, and
•
One or more non-contact sensors shall be located where the risk of entrapment or
obstruction exists, such as the perimeter reachable by a moving gate or barrier.
Open beam protects area
between the gate and
adjacent fence during the
open cycle.
Fence
Gate
Entrapment area exist between the gate
and the adjacent fence when the gate is in
the opening cycle.
Close beam prevents gate
from hitting obstructions
during the close cycle.
For gate operators utilizing a contact sensor:
•
A hardwired contact sensor shall be located and it’s wiring arranged so that the
communication between the sensor and the gate operator is not subjected to mechanical
damage.
•
A wireless contact sensor such as one that transmits radio frequency (RF) signals to the gate
operator for entrapment prevention functions shall be located where the transmission of the
signals are not obstructed or impeded by building structures, natural landscaping or similar
obstruction. A wireless contact sensor shall function under the intended end-use conditions.
Outside
Fence
Gate
Trailing Edge
Inside
Entrapment area exist between the gate
and the adjacent fence when the gate is in
the opening cycle.
11
Leading Edge