Nortech PD230 Enhanced Vehicle Detector, User Manual

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302UM0017 Rev 01 PD230 Enhanced Detector User Manual Page 16 of 37
ASB operates as follows. When ASB is disabled the undetect level is dependent on
the sensitivity setting of the detector. Hence as the detector is made less sensitive,
the undetect level will be reduced accordingly. When the ASB is enabled the undetect level will
always be the same irrespective of the sensitivity setting and will be equivalent to the undetect level
when the sensitivity is on maximum setting.
4.3 Modes of Operation
The PD230 Enhanced Detector may be configured for any one of the following modes:
Presence Mode
Pulse Mode
AB Logic Presence Mode (Barrier Operation)
AB Logic Pulse Mode (Counting Logic)
4.3.1 Presence Mode
Link LK1 open
To set Channel 1 to Presence mode switch OFF switch 10
To set Channel 2 to Presence mode switch OFF switch 9
In the presence mode the detector channels operate independently
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.
The presence outputs are known as fail-safe outputs. This implies that in the event of a
power failure or loop failure the detector will give detect outputs. (Fail-Secure Presence Mode
is available on request. MOQ applies)
If 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 an inductance change of 3%
∆
L/L.
4.3.2 Pulse Mode
Link LK1 open
To set Channel 1 to Pulse mode switch ON switch 10
To set Channel 2 to Pulse mode switch ON switch 9
In the pulse mode the detector channels operate independently.