DSP-50 User Manual
Contents
1. 2 240 1 755 ff DSP 50 Vehicle Detector 1 575 q IABL B B B 5 orF Pres JON Pulse OFF Pulse JON Output V 3 OFF Fail Safe ON Fail Secure L3 2 oFF Norm OFF 2sec ON 2sec JON 5 sec 1 OFF ON Delay opt Ex jon Delay CONTROLS INC Dip Switch Settings pl Frequency 1 i Frequency 2 9 slorF Lop_ JON Magnetometer 7 7 OFF Norm Presence ON Extended 4 OFF Normal Sens ON Sens Boost DSP 50 User Manual Green LED On Normal Fast Blink Shorted Loop o Slow Blink Open Loop e Figure 1 Physical Dimensions Page 7 of 27 375 860 763 m HD DSP 50 Power E Detect A d Detect B gt BS e Elia E De o 5 F E e 5 A y 2 E CU a DSP50_MAN_A 4 Features and Functions Solid State Outputs The DSP 50 has three solid state open collector outputs Solid state outputs have several advantages over relay outputs e Allows for a smaller form factor e Lower power consumption e Outputs do not have to be debounced relay contact bounce when closing e Higher reliability due to no moving parts But they also have their limitations e Requires that the detector and the operator have the same DC common e Requires a pull up resistor to function correct2. DSP 50 User Manual Page 26 of 27 DSP50 MAN A setting may be inadequate Adjust the sensitivity one level higher and recheck the detector for proper detection If the channel sensitivity is set to 9 and the red LED still does not come on and you have another operating detector in the same box swap the loops between a working detector and a failing detector If the problem follows the loop the loop is the problem If it stays in the same detector replace the detector DSP 50 User Manual Page 27 of 27 DSP50 MAN A
3. detector Power LED Flashes Quickly 5 Hz This flash rate indicates that the channel has a shorted loop a low resistance across the loop circuit or insufficient inductance The first step is to confirm that the loop is connected to the correct pins see the wiring configuration for the pin out If the wiring is correct the next step is to confirm that the detector is working correctly Disconnect the loop wires for the detector The LED should begin flashing at a much slower rate 4 second on second off If it does not change its flashing rate change the detector DSP 50 User Manual Page 24 of 27 DSP50 MAN A If a loop is connected to the correct pins of the detector disconnect the loop and using an ohmmeter check the resistance of the loop circuit If the resistance is below 0 2 ohms there is a short in the loop circuit The resistance will typically be 0 5 ohms to 1 5 ohms If the resistance is above 0 2 ohms the loop inductance should be checked This is done using an inductance meter The inductance of the loop should be more than 20 microhenries If the loop inductance is less than 20 microhenries the loop was probably not wound correctly and only has one turn in it In this case the loop must be replaced Other possibilities include a foreign object embedded in the saw clot and shorting some or all of the wires or failed wire insulation due to the wire being exposed or the wrong type of wire being used Very small loops may
4. Large Change Fault Prior Fault Normal DSP 50 User Manual The voltage applied to the detector is less than the minimum display voltage of approximately 5 volts The LED will be off At the start of a reset event a DIP switch change sensitivity change or power cycle the LED will turn off for 500 milliseconds on for 500 milliseconds off for 500 milliseconds off for 500 milliseconds and then display its normal state At the start of a reset event a DIP switch change sensitivity change or power cycle the LED will turn off for 500 milliseconds on for 500 milliseconds blink repeatedly with 50 milliseconds on followed by 50 milliseconds off for one second and then display its normal state When the detector senses that the loop is open or the inductance is too high the LED will turn on for 500 milliseconds then off for 500 milliseconds repeatedly for the duration of the fault If the fault is corrected the LED will display the Prior Fault indication When the detector senses that a loop is shorted or the inductance is too low the LED will turn on for 100 milliseconds then off for 100 milliseconds repeatedly for the duration of the fault If the fault is corrected the LED will display the Prior Fault indication When the detector senses that a loop is experiencing a large inductance change greater than 3096 the LED will turn off for 100 milliseconds then on for 100 milliseconds for 500 milliseconds then stay on for 500
5. after a vehicle leaves the detection area During this interval Output A will remain activated with the intent of allowing the vehicle to fully exit the detection area before the gate begins to close If another vehicle arrives during this extension interval the remainder of the extension time is canceled and the detector returns to the normal presence state This interval is indicated by the red Detect A LED blinking fast at 50 milliseconds on followed by 50 milliseconds off repeated until the interval is complete There are two extension intervals to choose from 2 seconds and 5 seconds When the detector is operating in the magnetometer mode the extension setting can be used to lengthen the output pulse on Output B If no extension is selected the output pulse will be 250 milliseconds long Otherwise the output pulse length is equal to the extension time setting Delay and extension cannot be selected at the same time The possible delay and extension settings are summarized in the table below OFF OFF None None OFF ON 2 seconds None ON OFF None 2 seconds ON ON None 5 seconds Factory Default DSP 50 User Manual Page 15 of 27 DSP50 MAN A Indicators The DSP 50 is equipped with three 3 LED indicators Power Green Detect A Red and Detect B Red Power LED The green power LED indicates these possible states Off Reset in Fail safe Reset in Fail secure Open Loop Shorted Loop
6. but the loop is still occupied and no further pulses can be output until the loop is no longer occupied In Pulse on Exit mode Output B will pulse when Output A deactivates If one of the extension features is enabled the pulse will not occur until the extension has timed out and the loop is still vacant The output will not pulse again until the loop has been reoccupied and any enabled delay has timed out Before the pulse has been output the Detect B LED will flicker a very fast flash that is not at full brightness This is a visual indication that a vehicle is being detected and the pulse will be output when the vehicle exits or is eventually tuned out NOTE In the magnetometer mode of operation the detector will only hold a detection for 2 seconds Therefore if a vehicle stays over the sensor for more than 2 seconds it may generate additional pulses for the same vehicle Sensitivity Rotary Switch The detector has ten 10 sensitivity levels In most situations the sensitivity setting five 5 will work effectively For those situations where this setting is not sensitive enough raise the sensitivity one level at a time until the desired performance is obtained For those situations where the detector is overly sensitive lower the sensitivity one level at a time until the desired performance is obtained The factory default is five 5 Like most inductive loop vehicle detectors the DSP 50 directly measures the change in frequency of t
7. loop itself Several factors go into a good loop installation type of wire used loop configuration and installation practices Type of Wire Used The wire used for wiring the loop should have a jacket of cross linked polyethylene or similar material that has very low moisture absorption properties This would be a wire with an XLP jacket such as XHHW THHN or similar wire types should never be used for loop wire The gauge of the wire to use depends on two factors Distance in cable feet from the loop to the detector and stresses the wire may see The gauge of the wire can be 20 AWG as long as the detector is within 50 feet of the loop in cable distance For 50 to 100 feet use at least 18 AWG wire At greater than 100 feet use a 16 AWG wire at a minimum If the loop is installed in asphalt and there will be heavy vehicles or stopping and starting vehicles in the loop area a 14 AWG or 12 AWG should be used to provide additional strength to the loop This helps increase the life of the loop in areas where the asphalt may slowly move and or deform due to wear DSP 50 User Manual Page 20 of 27 DSP50 MAN A Loop Configuration The size and shape of the loop will determine what type of vehicles it can reliably detect There are many variables that come into play including loop dimensions percent of coverage length of lead in wire number of turns in the loop area and detection height to name just a few of them One common rule is that the useable fie
8. waiting for it to depart before generating the exit pulse The Detect B LED will display a flicker during this time The flicker display is a very fast flashing at a lower level of brightness A vehicle is detected and Output B is activated or the detector has identified a fault and has activated Output B because it is in the fail output mode of operation DETECTOR RESET OCCURS 50ms ON and OFF ES nnnn 2 SECONDS AFTER RESET 500ms 500ms MT LED OFF a VEHICLE DETECTION OCCURS e VEHICLE DETECTION LOST 250ms E o Wb S 250ms LR a P FAULT OCCURS P FAULT CLEARED DSP 50 User Manual Figure 7 Detect B LED States Page 19 of 27 DSP50 MAN A 5 Installation Detector Installation Location The detector should be installed in a weatherproof location that is near the loop Ideally a technician should be able to see the loop and the detector at the same time Mounting The detector will function when mounted in any orientation If the operator does not have a connector for the detector to directly plug in to a
9. well as the new mini loops Many features have been included which are normally found only on more expensive models The small package is powered by a high performance 8 bit microcontroller that does not skimp on performance The DSP 50 detector has a small footprint and was designed to retrofit into many existing locations that may require a detector upgrade This allows maintenance personnel to carry only one detector to meet most if not all of their vehicle detection needs The detector uses a 10 pin Molex connector for its connections and has three solid state open collector outputs The solid state outputs allow for a smaller total package size lower power consumption and elimination of contact bounce DSP 50 User Manual Page 4 of 27 DSP50 MAN A 3 Technical Data Functional Data Sensitivity Ten sensitivities are user selectable 0 4896 AL L 5 0896 AL L 1 3296 AL L 6 06 AL L 2 2496 AL L 7 04 AL L 3 1696 AL L 8 03 AL L 4 1296 AL L 9 02 AL L Frequency Settings There are four frequency settings available The actual loop frequency is dependent on loop circuit inductance OFF OFF High OFF ON Medium High ON OFF Medium Low ON ON Low B Pulse Output 250ms 15ms Inductive Loop Response Time Response time is dependent on the sensitivity selected 0 70ms 10ms 5 70ms 10ms 1 70ms 10
10. 24 hours This is quite a long time but it isn t infinite The DSP 50 does not have infinite presence When the retuning process is complete any loop area that vehicles can still travel over will still detect the vehicle as expected Once the vehicle leaves the detector will fully recover from the retuning process within 1 second OFF Normal Hold Time ON Extended Presence Factory Default Output B Selection DIP Switches 5 and 6 Output B can be programmed to operate in one of four different modes that are selected using DIP switches 5 and 6 The available modes are modified by the loop magnetometer operation mode selected The following table identifies the modes available in each of the operating modes OFF OFF True Presence Pulse on Entry OFF ON Pulse on Entry Pulse on Entry ON OFF Pulse on Exit Pulse on Entry ON ON Fail Fail Factory Default True Presence Output B will be activated whenever a vehicle is present over the loop detection area Output A can be modified by the delay extension timing settings Output B will not use these timing settings For example if 2 seconds of delay is set Output B will activate as soon as the vehicle is detected while Output A will wait for two seconds of continuous presence prior to activating Both outputs will deactivate at the same time when the vehicle finally leaves Pulse on Entry Every time the loop is occupied a
11. DSP 50 Vehicle Detector Q wt 3 aN La po flo fa for o Ja foo fo O O a 1 S A 20 RS AAAAAAAAAS OW Diablo Controls Inc Copyright 2015 Document DSP50 MAN A Released September 28 2015 Pros Who Know Trust Diablo 1 Contents Figures 5 eg Ede uai PRI BIRD 3 Zee Te TEE 4 3 Tech ical Data 5 FUNCtION BD I Pu 5 Electrical Data e eee eset telae rer ae eheu AE ke ae EE E ke EORR TENE ER ENEE E 6 Environmental Data deat ad tete eaaet t dt e dite ae ate etd e eo ee rig eq e is 6 Mechanical Data E 7 4 Features and F nctiofls 7 rero Poo reed SERA eege E PER ee RE DOE NOE Fo CORN Pea FLUR RET Eege FE GER TARTE DAS 8 Solid sState ele 8 Detector Reset C NEE 8 Presence Detection uu rre esr ert uev ve XXe ee XY Ve Ee EEN VEER EEN Ye ena Ve E Vea Eee Roue ERA Yo 9 Pulse Detection e 9 sensitivity Rotary Switch cid 10 Frequency DIP Switches 9 and 10 11 Loop Magnetometer DIP Switch 8 eese enne enne ennt tnr conan conan anna entr senten nnns 11 Normal Extended Presence DIP Switch 2 11 Output B Selection DIP Switches 5 andei enne i Erre s E SEEE SEEE sss ranas 12 Normal Sensitivity Sensitivity Boost DIP Switch A 14 Fail Safe Fail Secure DIP Switch 31 14 Delay
12. Extension DIP Switches 1 and 3 15 WAC CACOMS PEE H 16 A CIE BN 20 Detector Installations TERI T ULT I em 20 koop InstallatiOnis3 ehe rte e ec edet edet eie to p ott ee e te dee AE 20 AB Configuration EN 23 A A a E E a aE 23 Ga e E TE 24 No Power bec EA 24 Power LED Flashes Slowly Hal 24 Power LED Flashes Quickly GHz 24 Power LED Shows Two Quick Flashes Once Every Two Seconds nennen nennen nnne nnns 25 Detect LED Intermittently Comes On Stays On Without a Vehicle Present 25 Detect LED Will Not Come On With a Vehicle Present 26 DSP 50 User Manual Page 2 of 27 DSP50 MAN A Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Physical Dimernsions s Ret daa 7 Outputs with No Delay or Extension 13 Outputs with Delay RE EU EAE 13 Outputs WIth Exterisionh tror Et TIO ER NT RE RTI FG RIS AERE RES 14 Power LED States ta hen e Pv eae AA A vn b e e A EOR e Rr edb 17 Detect A EED States tcd tete ren eere e D ea ane e Dg e eye dee UR 18 Detect BLED States edt pre tre ette ee ea esd A ur eek e a ee 19 koop Installatior E 22 Saw Cut for Home Run Exit and Chiseled Corner for Home Run Exit 22 DSP 50 User Manual Page 3 of 27 DSP50 MAN A 2 Introduction The DSP 50 detector is intended to be a full featured single channel detector that can work with both inductive loops as
13. On Exit Figure 4 Outputs with Extension Normal Sensitivity Sensitivity Boost DIP Switch 4 The detector has a user selectable feature that increases the sensitivity of the detector after initial detection This feature is most often used to allow a detector to have a lower starting sensitivity and then increase it after a vehicle has been detected This is useful in situations where high bed tractor trailer vehicles will be passing over the loop With this feature the detector may be able to detect the high bed portion of the vehicle without having to be overly sensitive and susceptible to false detections NOTE If detection of high bed tractor trailers is required correctly sized loops must be used OFF Disabled ON Enabled Factory Default Fail Safe Fail Secure DIP Switch 3 On the DSP 50 the option for fail safe or fail secure only applies to Output A In general a fail safe detector will activate the output when the loop circuit is failed This is useful on a safety loop to prevent accidental closure of a gate on a vehicle On the free exit loop this will keep the gate open until the situation is fixed Fail safe is used in applications where it is important to allow traffic flow to continue A fail secure detector will not activate the output when the loop circuit is failed This will keep the gate closed This is useful in high security areas or installations where containment is needed Output B is
14. also have a low inductance value if sufficient turns were not added Contact technical support for help with very small loops If you do not have a meter capable of measuring resistance and inductance but do have another operating detector in the same box you can skip to this step Swap the loops between a working detector and a failing detector If the problem follows the loop the loop is the problem If it stays in the same detector replace the detector Power LED Shows Two Quick Flashes Once Every Two Seconds This flash rate indicates that the channel has had a failure of some type but is currently working correctly Intermittent failures are usually open loop failures Any splices in the loop wire should be redone If there are any wire nuts used in the loop circuit remove them and replace with a crimp connection or preferably a soldered connection The open loop fault could also be a fatigued point in the loop wire This can occur at locations where the loop wires cross an expansion joint in the road surface Any place where the loop wires must move even if only a very tiny amount can cause wire fatigue The actual failure point may be very difficult to find Often the loop must just be replaced if the issue persists but cannot be found It is possible for the intermittent failure to be a shorted loop fault One possible source of this type of fault is a foreign object being embedded in the loop saw cut and damaging the wire Another is t
15. always fail secure when not in the fail output mode These failure modes only apply to the output when external power is applied That is the failure output is more of a loop failure output than a total failure output When placed in the fail safe position Output A will be activated when the detector recognizes that the loop is somehow compromised like if a loop wire is DSP 50 User Manual Page 14 of 27 DSP50 MAN A disconnected from its terminal screw If placed in the fail secure position Output A does not activate when a OFF Fail Safe ON Fail Secure fault condition is identified Factory Default When a fault is identified the green Power LED will flash to indicate the type of fault that was found See Indicators Power LED for more information on this display Delay Extension DIP Switches 1 and 2 Delay is the time added after a vehicle arrives in the detection area before Output A is activated During the delay interval Output A will remain de activated requiring that the vehicle stay in the detection area for a full 2 seconds before activating Output A This is useful at sites where vehicles traveling perpendicular to the gate may travel across the detection zone This interval is indicated by the red Detect A LED blinking slowly at 200 milliseconds on followed by 200 milliseconds off repeatedly until the interval is complete The only delay setting available is 2 seconds Extension is the time added
16. at can be displayed on this LED Off Reset in Fail safe Reset in Fail secure Delay Interval DSP 50 User Manual No vehicle present in the detection area or the detector has identified a fault and has deactivated Output A because it is in fail secure operation At the start of a reset event a DIP switch change sensitivity change or power cycle the LED will turn off for 500 milliseconds on for 500 milliseconds off for 500 milliseconds on for 500 milliseconds and then finally display its normal state Output A will be activated during this time At the start of a reset event a DIP switch change sensitivity change or power cycle the LED will turn off for 500 milliseconds on for 500 milliseconds blink repeatedly with 50 milliseconds on followed by 50 milliseconds off for one second and then display its normal state Output A will be deactivated during this time A vehicle has been detected but Output A is not activated due to the 2 The LED will turn on for 200 If the vehicle leaves the detection area before the two second delay interval expires second delay feature being active milliseconds and then off for two hundred milliseconds the LED will return to the off state If the vehicle is still present after 2 seconds the LED will become solid and Output A will be activated Page 17 of 27 DSP50 MAN A Extension Interval Output A Active A vehicle was detected but the detection zone is now empty and an exten
17. e detection mode Once activated the output will remain activated for as long as a vehicle is detected over the loop After four minutes of continuous detection the detector will begin to slowly retune the detector with the goal of tuning out the vehicle that stalled or parked on the loop over a relatively long time The time it takes to complete the retuning process is dependent on the strength of the call being induced by the vehicle In the Normal Presence mode usually takes between 15 minutes and about 4 hours In the Extended Presence mode the retune process may take over 24 hours When the retuning process is complete any loop area that vehicles can still travel over will still detect the vehicle as expected Once the vehicle leaves the detector will fully recover from the retuning process within 1 second Output B can be set to operate in the True Presence mode not available in the magnetometer mode of operation In this mode Output B activates as soon as a vehicle enters the loop and drops as soon as the loop is no longer occupied The output will ignore any Delay or Extension features that are currently active Pulse Detection When the magnetometer mode of operation is selected DIP switch 8 ON pulse on entry is the only detection mode of operation and is applied to Output A and Output B If the detector is in the loop mode of operation pulse on entry and pulse on exit modes of operation are available In the loop mode of operation O
18. ealant used can fully encapsulate the wire When the wire fits tightly in the slot the sealant may not be able to get below the wire leaving air pockets in the saw slot If water finds its way in to these air pockets over time freeze thaw cycles can slowly jack the loop out of the saw slot causing loop failure The saw slot should be deep enough that the loop wire will have a minimum of 77 of sealant over the top wire in the slot More is better Going too deep with the saw cut is also a concern Deep cuts in a road surface may impact the structural strength of the roadway especially if any reinforcement material is cut Using a smaller gauge of wire will allow for shallower saw cuts The corners of the loop should be crosscut at a 45 to help prevent damage to the wire insulation during installation and temperature cycling The angled cuts should be at least 9 back from where the corner would be The saw cuts should not go any further than necessary to insure that the saw slots are at full depth where they meet Special consideration should be given to where the home run saw cut meets the loop saw cuts Here either an additional saw cut should be made as shown in Detail A or the inside of the sharp corner should be removed with a chisel as shown in Detail B Once the saw slot has been cut the slot should be cleaned of all loose material High pressure air should be directed in to the saw slot to remove all debris This will also help remove dus
19. ection issues A common issue is movement of a slide gate or gate arm in close proximity to a loop The best solution would be to move the detection area further away from the moving gate We recommend that all loops should be at least 4 feet from a slide gate Try lowering the sensitivity one level so that the desired vehicles are still detected but not the moving gate NOTE Do not lower the sensitivity too much or vehicles will no longer be detected Another possibility is metal objects in close proximity to the loop Utility manhole covers are objects that may move slightly when vehicle tires drive over them especially if the vehicle turns while a tire in on the cover Most manhole covers can be bolted in place Contact the owner of the manhole to see what can be done to mitigate the cover movement Detect LED Will Not Come On With a Vehicle Present The first thing to do is verify that the LED in question is still working This is accomplished by a quick lamp test Reset the detector by temporarily changing DIP switch 1 Both LEDs should turn off and turn on If the Detect LED does not illuminate replace the detector If the red LED illuminates then perhaps the sensitivity setting is too low There are many variables in determining overall sensitivity loop size number of turns loop lead in percent coverage etc In most cases a sensitivity setting of 5 is the correct setting However to compensate for some unusual loop geometries this
20. edium High ON OFF Medium Low ON ON Low Factory Default Loop Magnetometer DIP Switch 8 The DSP 50 is capable of operating with either a standard inductive loop or the new mini loop magnetometer As usual the inductive loop operates in both presence and pulse modes However the mini loop magnetometer can only operate in pulse mode and will automatically override any settings to the contrary The factory default is the inductive loop mode OFF Inductive Loop ON Mini Loop Factory Default NOTE In the magnetometer mode of operation the detector will only hold a detection for 2 seconds Therefore if a vehicle stays over the sensor for more than 2 seconds it may generate additional pulses for the same vehicle Normal Extended Presence DIP Switch 7 After four minutes of continuous detection the detector will begin to slowly retune the detector with the goal of tuning out the vehicle that stalled or parked on the loop over a relatively long time For those instances where a longer hold period is desired extended presence is available DSP 50 User Manual Page 11 of 27 DSP50 MAN A The time it takes to complete the retuning process is dependent on the strength of the call being induced by the vehicle In the Normal Presence mode DIP switch 7 off this usually takes between 15 minutes and about 4 hours In the Extended Presence mode DIP switch 7 on the retune process may take over
21. hat the loop wire has been damaged where it enters or exits a conduit or junction box or that a conduit that the loop wire is in has been damaged crushed kinked bent cut etc Detect LED Intermittently Comes On Stays On Without a Vehicle Present This type of symptom is usually caused by one of three issues physical issues with the loop electrical interference moving objects in proximity to the loop Physical Issues with the Loop There are many ways in which a loop installation can go bad The insulation of the loop wire can fail This can be due to the loop wire being exposed in the saw lot damage to the wire insulation during loop installation physical stressing of the wire due to movement crossing of expansion joints or asphalt that has slowly moved or deformed wires moving in the saw slot due to poor loop sealant encapsulation foreign objects embedded in the saw slot and poor electrical connections in the loop circuit DSP 50 User Manual Page 25 of 27 DSP50 MAN A The best way to check for any of these issues is to use a megohmmeter commonly referred to as a megger Disconnect the loop wires in question from the vehicle detector and any other electronic equipment Connect one lead of the megger to one end of the loop wire and the other lead to earth ground Measure the resistance For accurate measurements the ground and the loop should be wet or at least damp use a hose or a bucket of water if needed to get the area wet T
22. he loop and from there calculates the change in inductance when a vehicle interacts with it The change in inductance is measured as AL L reads as percent delta L over L For the ten sensitivities the thresholds are Setting Sensitivity Setting Sensitivity 0 4896 AL L 5 0896 AL L 1 3296 AL L 6 06 AL L 2 24 AL L 7 04 AL L 3 1696 AL L 8 0396 AL L 4 1296 AL L 9 0296 AL L Factory Default DSP 50 User Manual Page 10 of 27 DSP50 MAN A Frequency DIP Switches 9 and 10 When loops are installed sufficiently far apart any two loops will not interfere with each other However if two loops are fairly close together say two to four feet apart the inductive fields may couple together and may interact causing intermittent false detections The main variables for inductive coupling are loop size distance between loops and the loop frequency To aid in mitigating inductive coupling each DSP 50 unit comes with two frequency switches They are binary coded allowing up to four different operating frequencies If there are suspicions that loops are interacting change one of the detector s frequency settings so that their inherent frequencies are sufficiently different as to no longer interact If the loops are the same size and number of turns setting one detector to high and the other detector to low will provide the maximum frequency separation OFF OFF High OFF ON M
23. he reading should be at least 100 megohms If it is less than 50 megohms the insulation is compromised and the loop circuit has to be replaced Between 50 and 100 megohms the loop may or may not work properly and reliably Electrical Interference There are several possible sources of electrical interference loop cross talk power lines electric motors and insufficient twisting of the loop wires just to name a few Other loops in the area that are connected to a different detector are prone to cross talk when the magnetic fields from different loops interfere with each other Adjusting the loop frequency of one or both of the loops in the same area will usually allow you to find a setting that both loops will work reliably with Anything that uses electricity is a possible source for electrical interference depending on its proximity to the loop and the amount of energy being used If you believe the loop is experiencing electrical interference turn off the device believed to be the source of the interference and see if the problem goes away Sometimes this is not possible and more technical means are needed to help identify the source Call Technical Support in this case If the electrical interference is occurring in the wire from the loop to the detector additional twisting should help mitigate the issue Moving Objects in Proximity to the Loop Objects that can move and are metallic or somehow electrically conductive may cause det
24. ld height of a loop is 2 3 of the shortest leg of the loop So if you plan on using a 2 5 x 6 loop the expected useable detection height would be 20 The shortest leg is 2 5 or 30 30 x 2 60 60 3 20 If the installation requires the detection of motorcycles as well as vehicles the loop should go to within one foot of the curb or roadway edge whichever is present If only motor vehicle detection is required within three feet of the curb or roadway edge is all that is required The number of turns to use in a loop is dependent on the size of the loop the amount of metal rebar cables etc and distance from the loop to the detector Rather than dive into all of the calculations to arrive at a value we will just use safe values You can almost never have too many turns in a loop only too few For a loop size of 2 x 6 four turns will be sufficient unless there is metal in the loop area In that case add at least one turn and two if possible As the loop size reaches 6 x 6 four turns will work for most all installations If you are unsure about your particular installation call tech support for guidance Installation Practices Permanent loops should be installed into the road surface by cutting slots into the road surface using a saw with an appropriate cutting disk for the road surface The slot cut should be wide enough that the wire being used will easily fit into the slot This is needed so that the loop s
25. ly e The output can only be pulled down to DC common can only sink current e Limited current switching capability 200 milliamps e Polarity sensitive will not work if connected backwards With proper engineering these limitations can be easily overcome and the benefits of the solid state output can be fully realized Almost all operators are now designed to share their DC common with external devices and have built in pull up resistors on their inputs to facilitate working with solid state open collector outputs These inputs usually require less than 20 milliamps of current sinking capability to be activated The polarity issue is handled by the operator if the detector plugs directly in to the operator If using an adapter board like the RK 1 or RK 3 the negative side of the output is already connected to DC common So the output is simply connected to the desired termination point on the controller and it should all work The three outputs that are available on the DSP 50 are Output A Output B and Output B Inverted The operation of Outputs A amp B are discussed in the following sections Output B Inverted is always the opposite of Output B This means that if Output B is active Output B Inverted is not and if Output B is not active then Output B Inverted will be Output B Inverted will not be mentioned outside of this section as it is always the opposite of Output B The easiest way to envision the function of a solid state open collec
26. milliseconds and repeat the sequence for the duration of the fault If the fault is corrected and the Fail Memory feature is enabled the LED will display the Prior Fault indication The detector is equipped with the ability to remember prior faults that have occurred since the last power interruption or reset changing a DIP switch or the sensitivity The LED will turn on for 1850 milliseconds off for 50 milliseconds on for 50 milliseconds off for 50 milliseconds and then repeat the sequence until power is cycled or the detector reset The LED is always on when the detector is in its normal state of operation Page 16 of 27 DSP50 MAN A Detector Reset Fail Safe Detector Reset Fail Secure Normal Operation Open Loop Fault Shorted Loop Fault Large Change Loop Fault Failure Memory y DETECTOR RESET OCCURS 500ms 500ms ra 50ms ON and OFF 500ms 500ms Pall lil MAII X 2 SECONDS AFTER RESET LED ON OPEN LOOP FAILURE OCCURS 500ms 500ms La SHORTED LOOP FAILURE OCCURS 100ms M LARGE CHANGE LOOP 100ms LM FAILURE OCCURS ES JUL IO TEL 1SECOND 50ms ON and OFF UN UE II Di UI 2 SECONDS 1 Figure 5 Power LED States Detect A LED The red Detect A LED is used to display the status of Output A There are several different statuses th
27. ms 6 140ms 20ms 2 70ms 10ms 7 140ms 20ms 3 70ms 10ms 8 140ms 20ms 4 70ms 10ms 9 140ms 20ms Mini Loop Response Time Response time is dependent on the sensitivity selected 0 130ms 10ms 5 130ms 10ms 1 130ms 10ms 6 250ms 20ms 2 130ms 10ms 7 250ms 20ms 3 130ms 10ms 8 250ms 20ms 4 130ms 10ms 9 250ms 20ms Vehicle Hold Time In Normal Presence Mode Approximately 1 hour for a detection of 1 AL L In Extended Presence Mode Approximately 19 hours for a detection of 1 AL L DSP 50 User Manual Page 5 of 27 DSP50 MAN A Electrical Data Loop Inductance 20 microhenries to 1500 microhenries including lead in inductance Not all frequency settings are available at inductances below 30 microhenries Operating Voltages One wide range power version 10 volts to 30 volts DC Solid State Output Rating Maximum Output Current 200 milliamps Maximum Pull Up Voltage 40 volts Maximum Voltage Drop Across Active Output 0 3 volts Current Draw 10 volts to 30 volts AC or DC 75 milliamps maximum Environmental Data Operating Temperature 35 F to 165 F 37 C to 74 C Storage Temperature 40 F to 176 F 40 C to 80 C Humidity Up to 95 relative humidity non condensing DSP 50 User Manual Page 6 of 27 DSP50 MAN A Mechanical Data Mounting Position Housing Material Housing Size Any Lexan 2 375 inches High x 2 240 inches Wide x 860 inches Deep 60 33 mm High x 56 90 mm Wide x 21 84 mm Deep
28. n adapter board will be needed RK 1 or RK 3 Mount the adapter board such that the switches and LEDs on the detector will be easily accessible for configuration and troubleshooting Wiring If plugging the detector in to the operator you should be certain that the operator pin out for its connector is the same as that of the DSP 50 detector and that the voltage supplied to the detector is between 10 and 30 volts DC If using an adapter board terminate all wires on to the adapter board before plugging to detector into the board Wire nuts should never be used at any point in the loop circuit itself All loop connections should be crimped or screw terminals at a minimum and soldered for best long term reliability Special attention should be paid to ensure that the loop wires remain tightly twisted together An air gap between the two wires for a loop may cause the detector to lock up if the wires are disturbed Remember that the DSP 50 uses solid state outputs and can only sink current Therefore if you want to drive a relay coil with an output the other side of the relay coil must be connected to an appropriate voltage for the coil positive DC supply Using an AC relay is not possible and may damage the detector The detector has snubber diodes built in for all of the solid state open collector outputs in case they do drive a relay coil Loop Installation The reliability and overall performance of the detector are greatly dependent on the
29. ossible from foreign object penetration Never use a continuous piece of backer rod over the loop as this would prevent the loop sealant from encapsulating the loop wire The loop sealant used should be appropriate for the roadway surface that was cut Generally epoxy or polyester based sealants are used for concrete surfaces and polyester or urethane based sealants are used for asphalt surfaces However these are not hard guidelines and specific circumstances will determine which type of sealant should be used Once the loop wire leaves the saw slot it should be twisted at least three times per foot More is better The twists should be kept tight to be most effective in reducing the effects of electrical interference 6 Configuration Wiring There is only one wiring configuration pin out offered for the DSP 50 Loop or Mini Loop Loop or Mini Loop DC Not Connected Not Connected Output B Output B Inverted Output A DC DC Common OV O J D UI BEjw N RE Eb o DSP 50 User Manual Page 23 of 27 DSP50_MAN_A 7 Troubleshooting No Power LED The first step is to ensure that the correct model of the detector is being used for the installation Ensure that the wiring is correct and the correct voltage is being used Use a meter to measure the voltage applied to the detector The voltage must be between 10 volts and 30 volts AC or DC If the correct voltage is applied and
30. single 250 milliseconds pulse will be generated on Output B If the 2 second delay feature is active the pulse will not occur until the sensor has been continuously occupied for 2 seconds Pulse on Exit Every time the loop becomes vacant or a vehicle is tuned out a single 250 milliseconds pulse will be generated Output B f extension time is selected the pulse will occur after the extension time has completed DSP 50 User Manual Page 12 of 27 DSP50 MAN A Fail If the DSP 50 recognizes some type of loop failure Output B will be activated Output B will remain activated until the failure is corrected NOTE Output B is always fail secure when not in the fail mode of operation Output B Inverted is always in the opposite state of Output B and is not shown in the following figures The following figures show the effects of delay and extension on the A amp B outputs when the detector is operating in the loop mode The numbers between edges are the number of seconds in that period Vehicle Over Loop Output A Normal Output B True Pres Output B Pulse On Entry Output B Pulse On Exit Figure 2 Outputs with No Delay or Extension Over Loop Output A 2S Delay Output B True Pres Output B Pulse On Entry Output B Pulse On Exit Figure 3 Outputs with Delay DSP 50 User Manual Page 13 of 27 DSP50 MAN A Vehicle Over Loop Output A 2S Extend Output B True Pres Output B Pulse On Entry Output B Pulse
31. sion interval is being timed The extension interval can be programmed for no extension 2 seconds 5 seconds or 10 seconds When the detection area becomes vacant the extension timer will start and the A output will continue to be activated During this interval the LED will blink quickly at 50 milliseconds on and 50 milliseconds off If another vehicle enters the detection area during this interval the extension time is cancelled and the LED will return to the solid state Note There is no delay interval for any newly arriving vehicle if a vehicle is already in the detection area or the detector is in the extension interval A vehicle is detected and any delay time has been timed or the detector has identified a fault and has activated Output A because it is in fail safe Detector Reset Fail Safe Detector Reset Fail Secure No Vehicle Detection Vehicle Detection 2 Sec Delayed Detection 2 Sec Extended Detection operation p DETECTOR RESET OCCURS Rose sooms re 2 SECONDS AFTER RESET 50ms ON and OFF 500ms somsH OW aC 2 SECONDS AFTER RESET LED OFF VEHICLE DETECTION OCCURS VEHICLE DETECTION LOST 2 SECONDS 200ms 200ms 2SECONDS soms ON and OFF H I I IL IL LLL Figure 6 Detect A LED States Detect B LED The red Detect B LED is used to display the status of Output B There are several different s
32. t from the saw cutting operation from the sides of the saw slot This will allow better adhesion of the loop sealant to the saw slot DSP 50 User Manual Page 21 of 27 DSP50 MAN A F did ROD PIECE LOOP WIRE aa Figure 8 Loop Installation Figure 9 Saw Cut for Home Run Exit and Chiseled Corner for Home Run Exit DSP 50 User Manual Page 22 of 27 DSP50 MAN A The loop wire should be installed as a continuous piece of wire from the detector to the loop all of the turns in the loop and back to the detector Remember to make allowance for shrinkage in the wire length when the portion of the wire not in the roadway surface is twisted The twisting is important for dealing with electrical noise A splice of the loop wire should never be made in the roadway If the loop wire needs to be spliced to another cable to get to the detector the splice should be done in a junction box and the connections should be soldered and weatherproofed Wire nuts should never be used at any point in the loop circuit In order to keep the loop wire at the bottom of the saw slot 1 to 2 pieces of backer rod should be placed in the saw slot every 1 to 2 feet The backer rod should be sized such that it fits snugly in the saw slot Use a blunt object not a screwdriver to press the backer rod pieces down into the saw slot as far as they will go Keeping the loop wire at the bottom of the saw slot allows the loop sealant to provide the maximum amount of protection p
33. tatuses that can be displayed on this LED Off Reset DSP 50 User Manual No vehicle present in the detection area or the detector has identified a fault and has deactivated Output B At the start of a reset event a DIP switch change sensitivity change or power cycle the LED will turn off for 500 milliseconds on for 500 milliseconds blink repeatedly with 50 milliseconds on followed by 50 milliseconds off for one second and then display its normal state Page 18 of 27 DSP50 MAN A Detector Reset No Vehicle Detection True Presence Pulse on Entry Pulse on Exit Fail Output Pulse Timing Pulse Occupancy Output B Active Output B is configured for a pulse mode of operation Pulse on Entry Pulse on Exit or Magnetometer modes and is generating a 250 millisecond activation pulse on Output B The Detect B LED will be on during the 250 millisecond activation period Output B is configured for a pulse mode of operation while operating in the loop mode Pulse on Entry or Pulse on Exit and a vehicle is being detected but Output B is not activated There are several circumstances under which this can occur In the Pulse on Entry mode this occurs when delay is enabled and currently timing or the entry pulse has been generated and the vehicle is still over the sensor In the Pulse on Exit mode this occurs when delay is enabled and currently timing or the detected vehicle is still over the sensor and the detector is
34. the power LED is not on replace the detector Power LED Flashes Slowly 1 Hz This flash rate indicates that the detector has an open loop a high resistance in the loop circuit or excessive inductance The first step is to confirm that the detector has a loop connected to it and the loop is connected to the correct pins see the wiring configuration for the pin out If a loop is connected to the correct pins of the detector disconnect the loop and using an ohmmeter check the resistance of the loop circuit If the resistance is above 5 ohms there is a bad connection or the wire has been damaged The resistance will typically be 1 5 ohms or less If the resistance is below 5 ohms the loop inductance should be checked This is done using an inductance meter The inductance of the loop should be less than 1500 microhenries It is very unusual to have a loop with an inductance value this high but it is possible with very large loops and many turns If the loop inductance value is above 1500 microhenries the loop will have to be replaced with a loop with less inductance Contact technical support for help with very large loops If you do not have a meter capable of measuring resistance and inductance but do have another operating detector in the same box you can skip to this step Swap the loops between a working detector and a failing detector If the problem follows the loop the loop is the problem If it stays in the same detector replace the
35. tor output is to think of it as a normally open relay contact with the relay common connected to DC common In this way Output A and Output B can be envisioned as normally open contact closures and Output B Inverted as a normally closed contact Detector Reset When any of the DIP switches or the 10 position rotary switch is changed or power is cycled to the detector the detector will perform a reset The reset event will last for two seconds while the detector initiates any changes and waits for all systems to stabilize DSP 50 User Manual Page 8 of 27 DSP50 MAN A All three LEDs will turn off for 500 milliseconds at the start of the reset event After that the Detect A and Detect B LEDs will flash according to their fail safe or fail secure mode of operation A flash rate that is the same as the power LED indicates the output is operating as fail safe A much faster flash rate indicates that the output is operating in the fail secure mode Output A will be active if the detector is in the fail safe mode Output B is always fail secure and will not activate during a reset NOTE If a vehicle is over the loop during the reset period it will not be detected Presence Detection Presence detection is only available in the loop mode of operation DIP switch 8 OFF If the detector is in the magnetometer mode of operation only pulse on entry operation is available While in the loop mode of operation Output A will always operate in the presenc
36. utput B can be configured for pulse on entry or pulse on exit operation The pulse generated by the output will be 250 milliseconds long Output B will follow any Delay or Extension features that are currently active Pulse operation is not available on the A output except in the magnetometer mode of operation In the magnetometer mode of operation Output A and Output B are always configured for pulse on entry operation The pulse generated by Output A can be modified using the extension feature If no extension is active the pulse will be 250 milliseconds long If the 2 second extension feature is active the pulse will be 2 seconds long If the 5 second extension feature is active the pulse will be 5 seconds long The pulse generated DSP 50 User Manual Page 9 of 27 DSP50 MAN A by Output B will always be 250 milliseconds long If the 2 second delay feature is active Output A and Output B will not pulse until a vehicle has been continually detected for the 2 second delay time In Pulse on Entry mode Output B will pulse when the Output A activates If the delay feature is enabled the pulse will not occur until the delay has timed out and the loop is still occupied The output will not pulse again until the loop has been unoccupied and any enabled extension has timed out After the pulse has been outputted the Detect B LED will flicker a very fast flash that is not at full brightness This is a visual indication that the pulse has already been output
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