Loop Detector Settings
in
Parking and access control equipment manufactured in the UK
Automatic Sliding Gates
21
Figure 5.2 Slot Details
3 OPERATING PROCEDURES
3.1 Hardware Set-Up
The PD130 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, numbered 1 and 2. There are four frequency
selections and are set out as follows:
SW2 SW1
Off
Off
High
On
Off
Medium-High
Off OnM
edium-Low
On
On
Low
The frequency switches allow 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.
