Channel Selection - CARLO GAVAZZI LDD1 Manual De Instrucciones

7.5 Ground Installation
The loop wire can be installed in most road surfaces, but it is important to ensure a stable foundation.
Installation in asphalt or concrete are the most common and will give the most stable performance. It is
important that the loop wire does not move when the surface layer is under stress from vehicles. If this
happens the Loop Detector can create false detections. A stable wire installation is especially critical
when the Loop Detector is operating at high sensitivity settings or with ASB enabled. Wire movement
can for example be created by following the conditions:
• If the surface layer is too thin to support vehicle load
• If the groove is cut all the way through the surface layer
• If the foundation beneath the surface layer is not stable e.g. soil, sand or uncompressed gravel
The loop can be installed together with rebar (reinforced concrete) as long as the loop is placed on
top of the iron bars. If electrical heating of the road surface is needed, it is recommended to use 2-wire
cable types.
8. Product Setup Guide
The following section gives a general introduction of how to adjust the Loop Detector. Note that changes
performed on the DIP switches will not take effect until the product has been restarted. The sensitivity
dials can be adjusted while the product is running and will take effect immediately without restart.
WARNING: Before making any changes to the product settings, make sure no persons or vehicles
can be hit by any closing/opening mechanisms connected to the output of the Loop Detector.

8.1 Channel Selection

The Loop Detector can operate on four different frequency channels. This allows up to four individual
loops to operate in close proximity of each other without mutual influence. If two separate Loop
Detectors are operating on the same frequency channel, they may interfere with each other and
cause false detections, if the loops are placed too close. Changing the frequency channel on one of
the detectors can eliminate this problem. For Loop Detectors with two loops (LDD2), both loops are
operated on the same channel but will not influence each other.
22
Rev.00 - 03.2019 | LDD1/LDD2 Single and Dual Loop Detector | © 2019 | CARLO GAVAZZI Industri
Trafic flow
Loop
Channel 4
L11 L12 E1
R21 R22 R23
LDD1 4 5 6 7 LOOP
8
3 RELAY 1
2 9
1 10
SENSITIVITY RELAY 2
R11 R12 R13
A1 A2 E2
LDD1
L11 L12 E1
R21 R22 R23
LDD1
5 6
4 7 LOOP
3 8
2 9 RELAY 1
1 10
SENSITIVITY RELAY 2
R11 R12 R13
Loop
A1 A2 E2
Channel 1
Loop
Channel 2
Loop
Channel 3
L11 L12 E1
R21 R22 R23
5 6 LOOP
4 7
3 8
2 9 RELAY 1
1 10
SENSITIVITY RELAY 2
R11 R12 R13
A1 A2 E2
L11 L12 E1
R21 R22 R23
LDD1
5 6
4 7 LOOP
3 8
2 9 RELAY 1
1 10
SENSITIVITY RELAY 2
R11 R12 R13
A1 A2 E2
Trafic flow