Operation Manual

301UM0030_01 PD130 Enhanced Vehicle Detector User Manual Page: 13 of 29
ASB operates as follows: When ASB is disabled, the un-detect level is dependent on
the sensitivity setting of the detector. Hence as the detector is made less sensitive, the un-detect level
will reduce accordingly. When the ASB is enabled the un-detect level is fixed irrespective of the
sensitivity setting and will be equivalent to the un-detect level when the sensitivity is on maximum
setting.
4.3 Modes of Operation
In the presence mode the detector will give a continuous output during the presence of a vehicle over
the inductive loop. As the detector is designed with the permanent presence feature, the detector will
indicate vehicle presence for an unlimited period of time. If the permanent presence is not selected,
then the detect time will be dependent on the change of inductance. The presence time on the limited
presence setting will be approximately 1 hour for 3% ∆ L/L.
The pulse relay outputs a pulse of 150 milliseconds duration. When set to “pulse on detect” the
detector will give a pulse on detection of a vehicle. When set to “pulse on un-detect” the detector will
give a pulse output when the vehicle leaves the loop.
The presence output is known as a fail-safe output. This implies that in the event of a power failure the
detector will give a detect output. The pulse outputs are not fail safe and will not operate if a failure
occurs.
4.4 Response Times
The response time of the detector is the time taken from when a vehicle moves over the loop to when
the detector gives an output.
The response times of the PD130 Enhanced Vehicle Detector has been adjusted to prevent false
operation in electrically noisy environments, but retain adequate response to vehicles in parking and
vehicle access control applications.