Nortech PD27 Series - 1 Introduc�On

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307UM0200_01 May 2016 PD27x User Manual Page 4 of 30

1. Introduction

The PD27x Series Dual Channel Inducve Loop Vehicle Detector is a dual channel microprocessor based detector

designed specically for parking and vehicle access control applicaons. It is suited primarily for complex mullane

access control and counng applicaons. Using the most up-to-date technology, the PD27x has been designed to meet

the requirements of a vast number of parking applicaons pertaining to operang conditions and various opons

available to the user.

The primary funcon 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.

Figure 1. The PD27x Vehicle Detector (11 Pin housing on le and DIN Rail on right)

The detector has been designed for ease of installaon and convenience, with automac frequency selection to assist

with installaon, it is easily congured to suit various applicaons.

By making use of the DIP switches and push buon, the PD27x can be easily set up for the users applicaon needs. The

unit also provides diagnoscs by means of the Nortech DU100 and DU700 units.

The PD27x provides visual outputs (LED’s) on the front of the enclosure to provide an indicaon of the state of the

channels as well as the detector itself. The channel LED’s indicate whether a vehicle is present over the loop or there is

a fault on the loop while the power LED indicates that the unit has been powered, is operaonal and provides a means

of communicaon via the DU100 and DU700 units.

The unit has relay change-over contacts at the rear of the enclosure for providing outputs as congured by the front

panel DIP switches.

Although it is a dual channel detector, the design eliminates the possibility of crosstalk between the loops connected to

the detector by using sequential channel scanning.

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