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301UM0030_01 PD130 Enhanced Vehicle Detector User Manual Page: 9 of 29
3. OPERATING PROCEDURE
3.1 Hardware Set-Up
The PD130 Enhanced Vehicle single 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
The frequency switches are the lower two switches, switches No. 1 and 2. There are four frequency
selections:
SW2 SW1
Off Off High
On Off Medium-High
Off On Medium-Low
On On Low
The frequency switches allows the operating frequency of the loop to be shifted higher or lower
depending on the switch position. The frequency of the loop is determined by the loop size, and the
frequency of the switch simply causes a frequency shift on the loop.
Where more than one detector is used the detectors must be set-up to ensure that there is no cross-
talk (interference) between the detectors. This can be achieved by ensuring that the loops of the two
detectors are spaced sufficiently apart (approximately 2 metres between adjacent edges) and also
ensuring that the detectors are set to different frequencies. As a general rule, the detector connected
to the inductive loop with the greatest inductance should be set to operate at the lowest frequency.
Loop inductance increases as loop size, number of turns in the loop and feeder length increases.
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