Wavetronix SS225 User Manual
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© 2008 Wavetronix LLC. All Rights Reserved.
The Company shall not be liable for any errors contained herein or for any damages arising
out of or related to this document or the information contained therein, even if the Company
has been advised of the possibility of such damages. This document is intended for
informational and instructional purposes only. The Company reserves the right to make
changes in the specifications and other information contained in this document without
prior notification.
FCC Part 15 Compliance: This device complies with Part 15 of the Federal Communications
Commission (FCC) rules which states that operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesirable
operation. FCC compliance statements for applicable optional modules are to be found in
the module specifications. Unauthorized changes or modifications not expressly approved by
the party responsible for compliance with the FCC rules could void the user’s authority to
operate this equipment.
Disclaimer: The advertised detection accuracy of the company’s sensors is based on both
external and internal testing, as outlined in each product’s specification document. Although
our sensors are very accurate by industry standards, like all other sensor manufacturers we
cannot guarantee perfection or assure that no errors will ever occur in any particular
applications of our technology. Therefore, beyond the express Limited Warranty that
accompanies each sensor sold by the company, we offer no additional representations,
warranties, guarantees or remedies to our customers. It is recommended that purchasers
and integrators evaluate the accuracy of each sensor to determine the acceptable margin of
error for each application within their particular system(s).
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Introduction ............................................................................................................................. 5
SmartSensor Matrix Package .......................................................................................... 6
Selecting a Mounting Location ........................................................................................ 8
Installing the SmartSensor Matrix .................................................................................... 12
Selecting a Mounting Height ......................................................................................... 12
Attaching the Mount Bracket to the Pole .................................................................... 13
Attaching the Sensor to the Mount Bracket ............................................................... 14
Aligning the Sensor to the Roadway ............................................................................ 15
Applying Silicon Dielectric Compound ......................................................................... 17
Connecting the SmartSensor Cable ............................................................................. 17
Connecting Power, Surge, and Communications ........................................................... 21
Mounting the Back Plate ............................................................................................... 22
Connecting AC Power ..................................................................................................... 22
Controlling DC Power Distribution ................................................................................ 25
Providing System Surge Protection .............................................................................. 27
Terminating the Sensor Cables ..................................................................................... 29
Configure Contact Closure Communications .................................................................. 33
Installing SmartSensor Manager Matrix Configuration Tool ........................................ 43
Wavetronix Configuration Toolkit ................................................................................. 43
Installing SSMMX ............................................................................................................ 45
Microsoft .NET Framework............................................................................................. 49
Communication ................................................................................................................... 51
Serial Connection ............................................................................................................ 52
Internet Connection ........................................................................................................ 54
Virtual Connection ........................................................................................................... 56
Virtual Sensor File ........................................................................................................... 57
Address Book ................................................................................................................... 58
Viewing Connection Info ................................................................................................. 59
Communication Error Log .............................................................................................. 60
Uploading the Sensor’s Embedded Software ............................................................. 60
Sensor Settings .................................................................................................................... 63
Sensor Setup ........................................................................................................................ 65
Lanes and Stop Bars ....................................................................................................... 65
Move Sensor..................................................................................................................... 67
Restart Automatic Lane Configuration ........................................................................ 68
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Capture Lanes and Stop Bars to Edit Area .................................................................. 68
Make Manual Adjustments ........................................................................................... 68
Save Desired Changes to the Sensor ........................................................................... 72
Zones and Channels ....................................................................................................... 72
Verification ....................................................................................................................... 75
Tools ...................................................................................................................................... 77
Backup / Restore ............................................................................................................ 77
Rack Cards Tools ............................................................................................................. 79
Tracker Logging ............................................................................................................... 81
Appendix ............................................................................................................................... 84
Appendix A – SmartSensor Matrix (SS225) Specifications ...................................... 84
Appendix B – Matrix Cable Connector Assembly Information ................................. 84
Appendix C – SmartSensor Matrix Cable Lengths ..................................................... 86
Appendix D – Click! 112/114 User Reference Guide ............................................... 87
Appendix E – Click! 221 User Reference Guide ......................................................... 94
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Introduction
In the Introduction
SmartSensor Matrix Package
Selecting a Mounting Location
The Wavetronix SmartSensor Matrix™ traffic sensor is a stop bar presence detector
designed for use at signalized intersections (see Figure I-1). The SmartSensor
Matrix detects vehicle demand through the use of a 24.125 GHz (K band) operating
radio frequency. Classified as a Frequency Modulated Continuous Wave (FMCW)
radar, the SmartSensor Matrix detects and reports vehicle presence in as many as
10 lanes simultaneously.
Figure I-1: Wavetronix SmartSensor Matrix
SmartSensor Matrix is a first-of-its-kind radar vision device that delivers the
reliability of radar and the simplicity of non-intrusive detection for stop bar
applications. The unit will work consistently in all weather and lighting conditions to
keep your intersection running safely and efficiently. In most situations the sensor
is installed on the roadside in order to prevent the need for lane closures and traffic
control. Once the unit is installed, the configuration process is quick and easy.
After installation, this unit will require little or no on-site maintenance and can be
remotely configured. This user guide outlines the step-by-step process of installing
and configuring the SmartSensor Matrix. Any questions about the information in
this guide should be directed to Wavetronix or your distributor.
5
Caution
Do not attempt to service or repair this unit. This unit does not contain any
components and/or parts serviceable in the field. Any attempt to open this unit,
except as expressly written and directed by Wavetronix, will void the customer
warranty. Wavetronix is not liable for any bodily harm or damage caused if service
is attempted or if the back cover of the SmartSensor unit is opened. Refer all
service questions to Wavetronix or an authorized distributor.
SmartSensor Matrix Package
SmartSensor Matrix is the radar vehicle sensing device used in a Wavetronix Stop
Bar Detection System. The minimal stop bar detection system package contains
the following items:
SmartSensor Matrix SS225 detector(s) with installed sensor back-plate
Sensor Mounting Kit(s)
Sensor Cable(s) and connectors(s)
Pre-wired cabinet unit (PCU) with installed underground surge, termination
blocks, and DC surge option
Detector Rack Card(s) with patch cable(s)
SmartSensor Manager Matrix (SSMMTX) software
SmartSensor Matrix User Guide
Standard packages are built and ready to order for 1, 2, 3 and 4 approach systems
with as many as eight sensors. Figure I-2 illustrates a 4-sensor system. Check the
packing slip for actual contents. If any of items are missing, note the serial
numbers located on the back of the sensors and contact your distributor.
Figure I-2: System Diagram of a 4-Sensor Wavetronix Stop Bar Detection System
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The total Wavetronix Stop Bar Detection system includes other recommended
options (see Figure I-3) which include:
• AC power conversion option – This option is pre-loaded onto the PCU and is
normally recommended by Wavetronix instead of the DC surge protection
option, because it will not burden the existing DC power modules in the
cabinet and it will provide reliable power for the sensors and PCU
components.
Wavetronix Configuration Toolkit – The toolkit makes installation and
maintenance more convenient than ever. The toolkit provides both wired
and wireless configuration capability using a handheld configuration utility
and a Click! 421. The Click! 421 connects to the Command and Control
Bridge via a T-bus expansion port. The handheld configuration tool comes
preloaded with SmartSensor Manager and Click! Supervisor software, for
simple management of your system.
Remote IP Connection option – This option is pre-loaded onto the PCU and
is recommended for remote management.
Figure I-3: Integration of Options via the Command and Control Bridge
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Note
The Wavetronix Intersection Detection System provides a Command and Control
Bridge for management of all connected SmartSensor and Click! devices. This
Command and Control Bridge is completely separate from the dedicated
channels used for communication of contact closure detection calls in real-time.
The Wavetronix Stop Bar detection system is part of the broader Wavetronix
Intersection Detection System which includes certified systems for advance
(dilemma zone) and mid-block (system control) detection. The Wavetronix
Intersection Detection System has been designed to simply integrate the reliable
presence detection data of SmartSensor Matrix, with the superior passage detection
data of SmartSensor Advance, and high-quality count data of SmartSensor HD in
order to control signalized intersections more safely and efficiently than ever before.
Contact your authorized Wavetronix representative to learn how these packages can
be cost-effectively bundled together.
In addition the complete line of Click! products and Click! Cabinet Systems offers a
connectivity and integration solution for virtually every intersection application.
Contact Wavetronix technical services for assistance with your application specific
integration questions.
Selecting a Mounting Location
Consider the following guidelines when selecting a mounting location for each
SmartSensor Matrix unit:
Corner radar – SmartSensor Matrix is a corner radar with a panoramic
90°degree 100-foot view. The corner radar vision device detects in traffic in
a two-dimensional matrix to provide industry leading stop bar detection
performance. The sensor’s mounting location should be selected so that all
stop bar detection zones on an approach are within 6 to 100-foot radial
distance. Figure I.4 presents a top down view of a corner radar mounted to
detect the stop bar on a four lane intersection approach. The corner radar
device uses its radar vision to automatically determine the location and
orientation of lanes and stop bars within its field-of-view. It then detects
vehicle presence on a lane-by-lane basis.
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Figure I-4: Corner Radar
Mounting pole – The sensor is usually mounted on a corner vertical mast
pole or strain pole. On wide approaches the sensor can also be mounted on
the back side of a mast arm using an appropriate sensor mount. In either
case, the sensor should be mounted with at least a six-foot offset from the
first detected lane. Figure I.5 illustrates common mounting locations: A –
far side of approach, B- near side of approach, C – back side of mast arm.
Other mounting locations may be possible if these are not available at your
intersection. Contact Wavetronix Technical Services for assistance if you
would like to test an alternative mounting location.
Figure I-5: Mounting locations
Line-of-sight – Position the sensor so that it will have line-of-sight to the
entire detection area of interest. Avoid structural occlusion including trees,
signs, and other roadside structures.
Detection coverage – Position the sensor so that it will be able to reach all
the specified stop bar detection zones. Also consider that the sensor will
track vehicles as they enter and exit desired detection zones. Accordingly,
the sensor will often work better if you position detection coverage to track
vehicles for several feet before they reach the first zone in each lane.
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Likewise, if the detection coverage is aligned so that the sensor has a view
several feet beyond the stop bar (downstream from the stop bar into the
intersection) it is more likely to have better performance of detecting queue
dissipation. With the installation software, the presence and location of the
stop bar in each lane can be configured in order to enable advanced logic to
minimize the effects of occlusion of small vehicles by queued traffic.
Closest roadside – It is recommended that you mount the sensor on the side
of the road closest to the lanes of primary interest. In many cases this will
be near side. However, if left turn detection is more critical than through
movement detection the closest road side may be the far side of the
approach. Always mount the sensor high enough to prevent traffic from
occluding approaching detections. If you mount the sensor on the back side
of a mast arm, mount the sensor near the end of the arm to reduce the
potential the mast arm or departing traffic to occlude approaching vehicles.
Mounting height - Mounting the sensor higher will generally improve line-of-
sight and decrease occlusion of vehicles. A minimum height of 15 feet is
recommended. If the sensor is mounted on a vertical pole with a mast arm,
it is recommended that the sensor be mounted to avoid occlusion of the
roadway by the mast arm. This may require mounting the sensor below the
mast arm.
Mounting offset – A minimum offset of 6 feet to the first lane of interest is
required.
Redundant detection – It is possible to have multiple sensors monitoring the
same approach.
Sensor proximity – When multiple sensors are mounted at the same
intersection, interference can be avoided by configuring each sensor to
operate on a unique RF channel. In cases, where zones are spread over
more than 100 feet, multiple sensors are needed.
Departing lanes – There is usually no need to view traffic in departing lanes
or to configure departing lanes. However, if they are configured then the
stop bar should NOT be configured.
Suspended electrical cables - The sensor is designed to work in the
presence of suspended power lines and other electrical cables, however
these cables should be mounted at least ten feet away from the front of the
sensor.
Neighboring structures and parallel walls – For best performance, it is
preferred that the sensor be mounted without signs or other flat surfaces
mounted directly behind it. This will help reduce multiple reflection paths
from a single vehicle.
Cable length – Ensure that you have sufficient homerun and sensor cabling.
Cable runs as long as 500 feet are achievable using 24 VDC operation and
the system’s native RS-485 communications. If you have an application
that requires a cable length longer than 500 feet, contact Wavetronix
technical services for assistance.
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Part I
Installing SmartSensor Matrix
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Offset from first
Detecton Lane (ft)
Recommended
Mounting Height (ft)
Minimum
Mounting Height
(ft)
Maximum
Mounting Height
(ft)
6
17
15
30
10
18
15
30
15
19
15
30
20
20
15
30
25
21
15
30
30
22
15
30
35
23
15
30
40
24
15
30
45
25
15
30
50
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15
30
Warning
Installing the SmartSensor Matrix
In this Chapter
Selecting the Mounting Height
Attaching the Mount Bracket to the Pole
Attaching the Sensor to the Mount Bracket
Aligning the Sensor to the Roadway
Applying the Silicon Dielectric Compound
Connecting the SmartSensor Cable
Installing the SmartSensor Matrix is quick and easy. Once installed, SmartSensor
Matrix configures automatically and requires little or no on-site maintenance. The
installation process includes attaching the mounting bracket to the pole; attaching
the sensor to the mounting bracket; aligning the sensor; applying a silicon dielectric
compound to the sensor connector; and connecting the SmartSensor cable to the
sensor.
Caution should be used when installing any sensor on or around active roadways.
Serious injury can result when installation is performed using methods that are
not in accordance with authorized local safety policy and procedures. Always
maintain an appropriate awareness of the traffic conditions and safety
procedures as they relate to specific locations and installations.
Selecting a Mounting Height
After selecting a mounting location within the recommended range of offsets (see
introduction), use Table 1.1 to select a mounting height.
12
55
27
15
30
60 or more
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15
30
Table 1.1
Note
Note
It is possible to mount the sensor lower than 15 feet in some scenarios. The
sensor will continue to detect vehicles at lower heights, but missed detections
due to occlusion may become more prevalent or problematic depending upon
your application.
Attaching the Mount Bracket to the Pole
Before attaching the mount bracket to the pole, first make sure that your cables are
long enough to reach the sensor height and to stretch across the distance from the
sensor to the cabinet.
Follow the steps below to correctly attach the mount to the pole.
1. Insert the stainless steel straps through the slots in the mount bracket.
2. Position the mount on the pole so that the head of the mount is pointing
toward the lanes of interest at about a 45° angle. Figure 1.1 illustrates the
sensor mount pointed at a 45° angle. (Figure 1.1 also depicts the sensor
attached to the mount. This is intended to help visualize the objective of
pointing the mount at a 45°. The objective is that a 45°pointing will often
provide a ballpark alignment of the sensor beam over roadway, once the
sensor is attached. The next section of this chapter explains how to attach
the sensor.)
3. Tighten the strap screws.
The sensor mount may need to be adjusted later to fine-tune the alignment.
This is most easily achieved using the double-swivel mount. One swivel joint is
used to pan the sensor beam left or right. The other swivel joint is used to tilt
the sensor down towards the roadway. If you are NOT using the double swivelmount be sure to keep the pole straps adjustable at this point in the
installation process.
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Figure 1.1 – Attach the Mount Bracket to the Pole
Note
If you are mounting the sensor to the back side of the mast arm, you will
probably need to mount the sensor down toward the road. This will allow you to
use one swivel to point down towards the road and the other to pan left and
right.
Attaching the Sensor to the Mount Bracket
Use the following steps to securely fasten the sensor to the mount bracket:
1. Align the bolts on the sensor’s back plate with the holes in the mount
bracket. The 8-pin connector receptacle at the bottom of the unit should be
pointing towards the ground.
2. Place the lock washers onto the bolts after the bolts are in the mount
bracket holes.
3. Thread on the nuts and tighten (see Figure 1.2)
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Note
Figure 1.2 Attaching the Sensor to the Mount Bracket
Do NOT over-tighten the fasteners.
Aligning the Sensor to the Roadway
In most applications, the goal is to position the corner radar so that its fan-shaped
footprint provides coverage of all lanes approaching the stop bar. The sensor’s view
fans out 45° to the left and 45° degrees to the right, creating a 90° corner radar.
To visualize the extent of the sensor beam an installer can use a square framing
tool (e.g. rafter square) or other solid surface with a right-angle. The tool can be
held above the sensor as a visual aid similar to the illustration in Figure 1.1. By
looking down both edges of the square instrument you can visualize the extent of
the radar’s coverage.
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Figure 1.3 – Corner radar beam position
Usually the front-edge of the sensor’s beam is aligned to provide coverage beyond
the stop bar. This will allow placement of detection zones in beyond the stop bar
(not all vehicles stop behind the line), and it will also provide the sensor with a view
of vehicles exiting queues. If the sensor pole is upstream of the stop bar as in
Figure 1.2, it is recommended to pan in the direction of the stop bar.
Figure 1.4 – Sensor Aligned by Rotating Towards the Stop Bar
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Use the following steps to correctly align SmartSensor Matrix.
1. Adjust the side-to-side angle so that the front-edge of the beam provides a
view downstream of the stop bar.
2. Tilt the sensor down so it is aimed at the center of the lanes of interest.
3. If necessary rotate the sensor back plate so that the bottom-edge of the
sensor is parallel with the roadway. This is necessary where the intersection
approach has a significant grade.
Applying Silicon Dielectric Compound
Use the following steps to correctly apply the silicon dielectric compound: Tear the
tab off of the tube of Silicon Dielectric Compound.
1. Squeeze about 25% of the silicon onto the pins of the receptacle-side of the
connector at the base of the SmartSensor Matrix (see Figure 1.5).
2. Be sure to wipe off any excess compound.
Figure 1.5 – Connector Receptacle (left) and Protective Earth Lug (right)
Connecting the SmartSensor Cable
The sensor connector is keyed to ensure proper connection (see Figure 1.6); simply
twist the plug end of the connector clockwise until you hear it click into place.
Use the following steps to connect the SmartSensor Matrix Cable:
1. Insert and turn the connector to attach it. Match up the key for a quick
connection.
2. Connect one end of a protective earth ground wire to the ground lug
terminal. A 12 AWG stranded wire is recommended for ground connections.
3. Connect the other end of a protective earth ground wire to an earth ground
connection point.
To avoid undue movement from the wind, strap the cable to the pole or run it
through a conduit, but leave a small amount of slack at the top of the cable to
reduce cable strain.
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Note
Note
Figure 1.6 – Sensor Connector
(Left – Plug end with sockets A-H, Right – Plug and Back shell)
If you run the cable through the pole, do not drill through the sensor mount, as
the sensor and sensor mount may need to be adjusted in the future.
Route the SmartSensor Matrix home run cable from the sensor location back to the
main traffic cabinet. Then attach the cable to the sensor. Do not strip the service
end of the cable until after it has been routed through conduit. The cable should be
one continuous run without any splices.
The SmartSensor Matrix cable with connector can be purchased in standard
lengths (e.g. 50, 150, or 250 feet). If you need longer cable or would like to
create custom length cables, you can also purchase bulk spools of 1000-foot
cable. When using bulk spools, you will need to purchase the plug end of the
connector and the appropriate crimping tool separately. See Appendix D for
information on crimping.
Once the sensor cable is routed into the cabinet, prepare to label the service end of
the cable. Before you label the sensor, you may want to carefully strip back the
cable jacket and insulation of the service end of the cable (see Figure 1.7). The
wires comprise: one DC power wire pair, two RS-485 communication pairs, and a
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drain wire. The service end of the cable connects to plug-in terminals on the main
cabinet back plate.
Figure 1.7 – Service End Terminated At Traffic Cabinet Back Panel
Figure 1.8 – Service End Labeling
In Chapter 2 there is a section detailing how to properly terminate the service end of
the cable (see Figure 2.6). After landing each sensor cable, and powering each
sensor, you can enter location information specific to each sensor as described in
Chapter 4 (see Figure 4.2).
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Note
To setup the network in an orderly fashion, it is recommended that labeling be
used on the service end of each SmartSensor Matrix cable. Label the cables
according to agency guidelines. In addition you may elect to use labels to
mark the last seven digits of the serial number on each sensor, and the
direction of traffic monitored (see Figure 1.8). This can help expedite software
naming of sensor description, location, and approach fields.
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Connecting Power, Surge, and Communications
In this Chapter
Mounting the Pre-wired Cabinet Unit
Connecting AC Power
Controlling DC Power Distribution
Providing System Surge Protection
Terminating the Sensor Cables
Attaching the Serial Configuration Toolkit
Wiring Contact Closure Communications
After installation, each SmartSensor Matrix unit will need to be integrated into the
traffic cabinet for power, surge, and communications. Pre- wired cabinet units
(PCUs) are available for sensor integration. As an example, this chapter will detail
integration of a Wavetronix stop bar detection system PCU panel that
accommodates four SmartSensor Matrix units (one for each stop bar of a common
four approach intersection).
Figure 2.1 – Four approach Pre-built Cabinet Unit for SmartSensor Matrix
The standard four-approach PCU back plate is sized 11 inches wide and 11.5 inches
high. Softcopy and hardcopy plans of the cabinet unit wiring are available for
maintenance personnel. All wiring in the on the PCU is done using stranded wires
with wire ferrules for screw terminal connections. The stranded wires are flexible
21
and simplify maintenance. The wire ferrules provide a solid connection end point
Note
for screw terminal connections.
Mounting the Back Plate
Use the following steps to mount the back plate in the traffic cabinet:
1. Locate the space planned for mounting the back plate. Often, the PCU will
be able to mount on the side panel of a NEMA style cabinet.
2. Attach the back plate with the u-channel mounting screws.
If you have a 330 series (170/2070 style cabinet) with a 19” EIA rack, please
contact Wavetronix Technical Services for assistance. Wavetronix can provide
modified PCUs that attach to a 19 inch rack.
Connecting AC Power
Since SmartSensor Matrix operates on 10-28 VDC, the standard Wavetronix stop
bar detection system back plates provide an AC power conversion option. If you
select this option, the back plate will be loaded with the necessary AC to DC power
conversion, power surge, and circuit breaker.
If you choose to have your PCU built without the AC power conversion sub-assembly,
you will need to tap into surplus DC power capacity resident in the traffic cabinet. In
this case, Wavetronix recommends the use of the Click! 221 to protect the PCU and
SmartSensor Matrix units from DC surges. The Click! 221 is an 8-amp DC surge
module. For wiring and other information on the Click! 221 see Appendix E.
22
Caution
Warning
Make sure power to AC mains is disconnected while wiring the AC input.
The AC termination points for line (AC+, hot), neutral (AC-), and ground are found on
the bottom din rail next to the 110 VAC label. Use the following steps to connect
power wires from the AC terminal block or cord to the pluggable terminal blocks on
the bottom din-rail (see Figure 2.2):
1. Connect a neutral wire to the bottom-side of the white block labeled “N” for
neutral. The neutral wire is usually white.
2. Connect a ground wire to the bottom-side of the green block labeled “G” for
ground. The ground wire is usually green. (Please note that the ground
connection is different than the protective earth connection. See the section
on Providing System Surge Protection for instructions on connecting to
protective earth.)
3. Connect a line wire to the bottom-side of the black block labeled “L” for line.
The line wire is usually black.
4. Connect or turn on AC mains power.
5. Press the circuit breaker switch on the left side of the top din-rail to switch
power to the Wavetronix stop bar detection system panel. The switch is on
if the push button is below the level of the device housing. The switch is off
if the button is raised above the surface of the housing.
6. Verify that DC power is properly regulated by checking the Click! 201/202
devices to see that the DC OK LEDs are illuminated.
An authorized electrical technician should perform installation and operation
of this unit. Persons other than authorized and approved electrical technicians
should NOT attempt to connect this unit to a power supply and/or traffic
control cabinet, as there is a serious risk of electrical shock through unsafe
handling of the power source. Extreme caution should be used when
connecting this unit to an active power supply.
23
Figure 2.2: AC Power Conversion
Each AC power conversion sub-assembly will come pre-wired as shown in Figure 2.2.
The main three components of the sub-assembly include:
Click! 201/202 AC to DC converter
Click! 205 AC surge module
Click! 206 circuit breaker and switch
A Click! 201 provides 1 amp of power and is capable of powering a single sensor,
while a Click! 202 provides 2 amps and can power two sensors. The Click! 205
helps limit current surges on the power lines; the Click! 206 interrupts power during
overload conditions and provides a convenient way to turn power on and off for the
entire system.
A PCU will use wired blocks with one terminal at the top and two on the bottom
when one conductor needs to be routed two directions. For example, although not
shown in Figure 2.2, this type of wired block is used to connect AC power from the
24
one Click! 205 to both Click! 202 modules. These blocks are also used to route the
Tip
DC power from both Click! 202 to the 5-position screw terminal on the left side of
the T-bus.
Controlling DC Power Distribution
The 24V DC+ and DC- (common) connections from the AC to DC power convertors
distribute power to the sensors via the Click! 222 System Surge Protection units
(see Figure 2.2). The DC power wires out of the System Surge Protection units are
connected to a 2.0 Amp circuit breaker for each SmartSensor Matrix. The circuit
breakers provide a convenient way to switch power to each sensor independently.
When a switch is off power distribution is disabled.
To enable or disable DC power distribution, use the following steps:
1. Switch the main circuit breaker (left side of upper din-rail).
2. Switch the individual circuit breaker (left side of each sensor’s set of
terminal blocks.
With either the main or individual circuit breakers, you will enable power
distribution when the switch is on. When the switch button is level with the
device housing (pushed in) the switch is on. When the switch button is raised
above the surface of the housing (popped out) the switch is off. If you cannot
visually whether the button is pushed in or popped out, you should be able to
feel it with your hands.
25
Figure 2.2 – DC Power Distribution from System Surge Protection
The four-approach PCU has the 24VDC power wired from the output of the AC to DC
convertor into a 5-position screw terminal on the left side of the T-bus. This T-bus
has both green and gray connectors. Green T-bus connectors conduct DC power and
RS-485 communications from the left to the right side of the modules. Gray T-bus
connectors conduct only DC power from the left to the right side of the modules.
This means that a device that is attached to a gray T-bus connector will send RS485 communications to devices on its right side, but not its left side (see Figure
2.3).
For example, the gray T-bus in Figure 2.2 has its communication lines connected
with the two green T-bus devices on the right side, but not to the one on the left
side.
26
Note
Figure 2.3 – T-bus Pinout Diagram
Providing System Surge Protection
The Wavetronix Click! 222 system surge protection devices are designed to prevent
electrical surges conducted along underground cables from damaging the cabinet
equipment.
The SmartSensor Matrix unit has built-in surge protection and there is not a
need to use a pole-mount box for surge protection. However, it is strongly
recommended that the sensor be connected to a surge protection device in the
main traffic cabinet. If you choose not to use surge protection in your main
traffic cabinet, please contact Wavetronix Technical Services for assistance.
The power and RS-485 serial connections on the T-BUS and faceplate are protected
from surges on the incoming wires of the sensor cable. The sensor cables are
connected via the terminal blocks on the PCU to the screw terminals on the bottom
side of the Click! 222. The screw terminals on the bottom side of the Click! 222
have circuitry that prevents impedance matching issues on long non-uniform cable
runs to the sensor installation sites.
The PWR and DC Surge OK LEDs indicate that the device is powered and that DC
surge protection is operational. The TD (transmit data) and RD (received data) LEDs
indicate when data is transmitted or received over the RS-485 T-bus, Bridge, C & D
ports. However, the TD and RD LEDs do not indicate data transmitted on RS485 A
or RS485 B. Furthermore, after an electrical surge there is no method to determine
if the RS-485 surge protection is still operational.
27
Note
If the DC Surge OK LED is not lit up when the Click! 222 is powered, call
Wavetronix Technical Services for assistance.
Figure 2.4 – System Surge Protection
The communication wires running from the pluggable termination blocks on the
PCU’s bottom din-rail to the system surge protection devices are connected to
provide three independent serial connections:
1. Command and Control Bridge
2. Dedicated communications for sensor A detection calls
3. Dedicated communications for sensor B detection calls.
One serial connection is an RS-485 Bridge that enables a multi-drop shared
communication bus between all sensors on the panel. In a Wavetronix stop bar
detection system, the Bridge connection is designed for command and control of all
SmartSensor Matrix units, rack cards, and other connected Click! devices. This bus
is formed by wiring the C and D terminal blocks and landing the system surge
devices on a shared T-BUS.
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Note
When configuring the sensor, the configuration link of the install kit is rocked
onto the T-BUS, to the left of the gray T-bus connector. This connects the
configuration link to the Command and Control Bridge and allows for
convenient access to all sensors and rack cards from one connection point.
The configuration tool can automatically search for a list of all sensors or rack
cards on the bus.
The other two serial connections provide dedicated communications to each sensor.
During real-time traffic operations with multiple sensors, one sensor will send
detection calls to a detector rack card over port A, and the other will send detection
calls to another detector rack card over port B.
On a 2-sensor or 4-sensor PCU, the sensor wired into the left most terminal block
will be connected to port A & C on the leftmost Click! 222. Port A is for detection
calls and port C is connected to the Command and Control Bridge. The sensor wired
to the next terminal block from the left will be wired to port B & D on the leftmost
Click! 222. Port B is for detection calls and port D is connected to the command
and control Bridge.
Similarly, on a 4-sensor PCU the sensor wired to the third terminal block from the
left will be wired to Port A & C on the right most Click! 222. And finally, the sensor
wired to the rightmost terminal block will be wired to Port B & D on the rightmost
Click! 222.
In other words, for detection calls the ports will be used in an ABAB pattern from left
to right on a 4-sensor PCU. Likewise, for the command and control Bridge, the ports
will be used in a CDCD pattern from left to right.
All these connections are surge protected when the protective earth ground is wired
to the PE terminal block on the back plate. Normally, the back plate should be
mounted to the chassis of the cabinet to provide a ground path. In addition it is
strongly recommended to provide a low impedance protective earth connection.
To provide a low impedance protective earth connection:
1. Connect a protective earth ground wire to the bottom-side of the PE block. A
10 AWG stranded wire is recommended for protective earth ground
connections. A 10 AWG wire is the largest that will fit in the terminal block.
2. Connect the protective earth ground wire to a protective earth screw
terminal within the main traffic cabinet.
Terminating the Sensor Cables
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