Expanse XP20 USER GUIDE
Expanse XP20 USER GUIDE Provo, Utah 801.734.7200 www.wavetronix.
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CONTENTS 1 CHOOSING A MOUNTING LOCATION 5 5 7 Mounting location, height, and offset 8 10 10 Occlusion and multipathing 2 11 12 13 15 16 Choosing where to mount Choosing a mounting height and offset Fixing occlusion problems Fixing multipath problems INSTALLING THE XP20 Mounting the sensor Aligning the sensor to the roadway Assembling the cable Applying silicon dielectric compound Connecting the cable
1 Choosing a mounting location Mounting location, height, and offset Choosing where to mount Figure 1. The XP20 radar footprint ˿ For best performance, make sure the lanes being detected are all parallel to each other; avoid on- and off-ramps/turn lanes that angle away from the road.
Make sure all monitored lanes are within 6 to 250 ft. (1.8 to 76.2 m) of the sensor. Up to 22 lanes can be detected. ˿ If you’re putting a sensor on a road with stoplights or stop signs, position the sensor toward middle of the block, to reduce the likelihood of having stopped vehicles in the XP20 radar footprint. ˿ Figure 2. Midblock installation Note. You can purchase your cable from Wavetronix or from a cable manufacturer.
Choosing a mounting height and offset Mounting guidelines in feet Recommended * reduction in number of reported speeds.
Mounting guidelines in meters Note. Some countries, such as the UK, have their own variant of these mounting guidelines due to differences in road layouts and traffic profiles. Please consult with your local Wavetronix office to ensure you are installing to the correct local guidelines. Recommended * reduction in number of reported speeds. Offset Height (acceptable range) 2.0* 3.5 (2.5–5.5) 2.5* 3.5 (2.5–5.5) 3.0 3.5 (2.5–5.5) 3.5 3.5 (3.0–6.0) 4.0 4.0 (3.0–7.0) 4.5 4.5 (3.5–7.5) 5.
Figure 3. Occlusion Occlusion occurs when one object blocks another object from the sensor’s view, as shown above. This can happen with ˿ ˿ ˿ ˿ Tall vehicles like semi trucks Signs Barriers and sounding walls Trees and more Normal detection Signal that doesn’t return to sensor is scattered Signal bouncing off wall causes false detection Figure 4. Left: direct path return; right: multipath return Multipathing occurs when a large flat surface near the sensor interferes with detection.
˿ Sounding walls and more Fixing occlusion problems Note. A good rule of thumb is that 50% of a vehicle must be visible above any barrier in order to be detected. Move the sensor higher on the pole (keeping it within the recommendations in the mounting guidelines table). ˿ Move the sensor to another spot on the freeway if possible, away from obstructions.
2 Installing the XP20 Mounting the sensor Figure 5. Mounting the sensor Use Band-It or a similar clamping system to attach the mount to the pole.
back of the sensor above the black tab on the end of the mount and sliding down. 3 Tighten the thumb screw on the sensor; for a more secure installation, finish tightening with a screwdriver. Aligning the sensor to the roadway Figure 6. Up-and-down positioning 1 Tilt the sensor down so the front is aimed at the center of the detection area. Figure 7.
Figure 8. Side-to-side positioning 3 Adjust the side-to-side angle so it’s perpendicular to the flow of traffic. 4 Once you are satisfied with the sensor alignment and positioning, tighten all bolts in the mount. Note. You will double-check the alignment of the sensor in the software. Assembling the cable Figure 9. Cable with backshell nut, rubber seal, and clamping ring 1 Slide the backshell nut over the end of the cable.
drain wire. On the two insulated conductors, strip back the insulation 8 mm. 7 Crimp ferrules to the ends of all three wires. Figure 11. Terminating conductors and drain in pin housing 8 On the pin housing, loosen the set screws (located on the sides of the pin housing) on pins 2, 3 and 4, using the provided Allen wrench, to make room to terminate the wires.
12 Snap the connector insert on top of the pin housing. Again, you'll have to align it properly. 13 Slide the rubber seal inside the clamping ring. Figure 14. Completed connector 14 Insert the whole assembly into the backshell, twisting the backshell until it slips over the alignment marks in the connector insert; slide the backshell nut forward over the cable and screw the two together using two 18 mm wrenches. Applying silicon dielectric compound Figure 15.
Connecting the cable Figure 16. Cable run through pole (left) and through conduit (right) Note. When you run the cable through the pole, don’t drill through the sensor mount, as the sensor and sensor mount may need to be adjusted in the future. 16 • Insert the cable connector into the sensor connector; be aware that the connector is keyed and will only fit in a certain way. 2 Tighten the nut on the cable connector. 3 If you haven't already, run the cable through the pole.
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