Loop Detector Settings
in
Parking and access control equipment manufactured in the UK
Automatic Sliding Gates
21
1 INTRODUCTION
The PD130 is a single channel microprocessor based detector designed specifically for parking
and vehicle access control application. The PD130 has been designed using the most up-to-date
technology in order to meet the requirements of a vast number of parking applications (in terms of
operating conditions and options available to the user.)
The primary function of the detector is to detect vehicle presence by means of an inductance
change, caused by the vehicle passing over a wire loop buried under the road surface.
The detector has been designed for ease of installation and convenience. The various modes are
selected by changing the positions of the switch on the front of the unit.
The switches allow for different loop frequency settings, sensitivity settings and mode settings.
The PD130 provides visual output (LED) on the front of the enclosure and relay changeover
contacts are taken on the 11-pin connector at the rear of the enclosure. The LED indicates the
power has been applied to the unit, that a vehicle is present over the loop and if there is a fault on
the loop. The Presence relay is fail-safe and will close on a vehicle detect or in the event of power
failure or a loop fault.
Figure 5.1 Adjacent loops connected to different detector modules
