Nortech PD230 Enhanced Vehicle Detector, User Manual

Page: 10 / 43

302UM0017 Rev 01 PD230 Enhanced Detector User Manual Page 10 of 37
3. OPERATING INSTRUCTIONS
3.1 Hardware Set-up
The PD230 Enhanced dual channel parking detector is designed to be shelf or DIN rail mounted with
the controls and visual indicators at the front and wiring at the rear of the enclosure.
The power, loop and relay outputs are all connected to the single 11-pin plug, which is mounted at
the rear of the enclosure.
3.2 Switch Setting Selections
3.2.1 Frequency Switch
Where more than one detector is used at the same site, the
detectors must be set-up to ensure that there is no CROSSTALK
(interference) between adjacent loops connected to different
detectors.
For more information about crosstalk refer to section 5.2.2.
The frequency switches are the lower two switches, numbered 1 and
2. There are four frequency selections and are set as follows:
The frequency switches allows the operating frequencies of the
detector to be shifted higher or lower depending on the switch
setting.
The operating frequency of the detector channel is determined by:
Inductance of the loop and feeder cable
Detector frequency switch settings
The operating frequency of the detector channel increases as the
loop inductance decreases and vice versa.
The inductance of the loop and feeder cable is determined by:
Size of the loop
Number of turns in the loop
Length of feeder cable
As a general rule, the detector connected to the inductive loop with the greatest inductance should be
set to operate at the lowest frequency.
When the frequency switch setting is altered, the operating frequency of both detector channels will
shift. Because the unit has a common oscillator and the multiplexer connects the loops alternatively
to this oscillator.
3.2.2 Sensitivity
S1 S2
Frequency Setting
Off Off High frequency
Off On Medium-High frequency
On Off Medium-Low frequency
On On Low frequency