Nortech PD27 Series - 2 Technical Data; Func�Onal Data

307UM0200_01 May 2016 PD27x User Manual Page 5 of 30
2. Technical Data
2.1 Functional data
Tuning Fully Automac with opon to enable Automac Frequency Selecon (AFS)
Self-tuning range 20 µH to 1500 µH
Sensivity Four steps adjustable on the DIP switches (High, Medium-High, Medium-Low, Low)
Opons available are 0.01% ΔL/L, 0.02% ΔL/L, 0.05% ΔL/L and 0.10% ΔL/L
ASB (Automatic Sensivity Boost) is selectable via the DIP switches
Frequency With AFS switched on the channel tunes automatically to one of five possible frequencies
There are four selectable frequency opons with AFS switched o
Operang frequency of 18 – 110 kHz (Determined by loop geometry and frequency seng)
Output Configuraon 2 output relays
User congurable for: Presence on detect
Pulse on detect
Pulse Output Duraon 150ms
Presence Method Permanent or Limited presence
Presence Time Innite when the unit is on Permanent Presence
Dependant on level of detect and environmental condions when on Limited Presence
Dri Compensaon Rate Approx. 1 %∆L/L per minute
Response Times Detect: 53.0 – 73.0ms
Undetect: 280.0 – 350.0ms
Subject to sensivity level, level of detect and speed of vehicle over the loop
Visual Indications 1 x Power / Status LED – Red
2 x Channel Status LED – Green
Reset Holding the reset buon for 3s iniates a retune
Surge protecon Loop isolaon transformer, gas discharge tubes, and Zener diode clamping on loop input.
Power Fail Innite memory retenon of detector state on power failure (provided certain criteria are
met refer to secon 4.5). This funcon can be turned on and o via the Reset push buon.