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Siemens SLD4 Application Notes

Loop detector
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SLD4
Loop Detector Application
Notes
Feb-20
Issue 3
667/HQ/45200/101

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Summary of Contents for Siemens SLD4

  • Page 1 SLD4 Loop Detector Application Notes Feb-20 Issue 3 667/HQ/45200/101...

  • Page 2: Table Of Contents

    Handling Precautions Introduction 1.1. Purpose 1.2. Document References 1.3. Key Terms and Abbreviations General Setup 2.1. SLD4 Loop Inductance Link Settings 2.2. SLD4 Sensitivity Bus Detection 3.1. Loop Type for Bus Applications 3.2. Basic Setup of Detector 3.3. Advanced Configuration Setting 3.3.1.
  • Page 3 Mapped Classification Parking Bay Applications 8.1. Parking Bay Monitoring (typically used for EV Chargers) 8.2. Presence Time (bay occupation time) 8.3. Adjacent Bay Detection Troubleshooting 9.1. Refreshing SLD4 Configurator Setup 9.2. Serial Cable connection (702/4/08535/000) Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 4: List Of Figures

    Figure 21 : Example 2 Classification bin configuration Figure 22 : Digital output configuration for Example 2 Figure 23 : Presence Time (s) Settings Figure 24 : SLD4 Configuration Tool – Creating a New Configuration Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 5: List Of Tables

    Table 1 : External Document References Table 2 : Terms and Abbreviations Table 3 : Link and Switch Function Table 4 : Inductance Jumper Settings for Detection Table 5 : Suggested Bus Detection Settings Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 6: Health And Safety Protection

    For UK this refers to Electricity at Work Regulations 1989. For DE this refers to GV A3, DIN EN 50110-1 (VDE 0105-1) and VDE 0832 and the work-safety leaflet ASM 0099-01 Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 7: Handling Precautions

    4. Ensure that the user is discharged prior to handling any modules. This can be achieved by touching an earthed surface such as a control cabinet, for example. Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 8: Introduction

    Introduction Introduction 1.1. Purpose These application notes provide additional guidance, to that provided in the SLD4 User Manual (667/HB/45200/000), for a range of specific applications such as bike, bus and tram detection. 1.2. Document References External Document References 667/HB/45200/000 SLD4 User Manual...

  • Page 9: General Setup

    When using 24 AC supply to the detector, only use battery powered interface equipment (e.g. laptop, PDA). Do not connect mains powered/connected interface equipment to the SLD4. Fail- ure to observe these precautions may damage the detector and/or the connected device 2.1.

  • Page 10: Sld4 Sensitivity

    “Hz” may need to be changed higher or lower in proportion to the loop frequency change. This is the disadvantage of using the “Hz” setting mode. Detector Variant Differences The standard SLD4 detector supports only “Bicycle” mode whereas the remaining modes re- quires an enhanced SLD4 detector. Loop Detector Application Notes SLD4...

  • Page 11: Bus Detection

    Note This application note is to be read in conjunction with the SLD4 User Manual (667/HB/45200/000). When using the SLD4 advanced detector the following points must be considered as they have big influence on the performance of the detector: •...

  • Page 12: Advanced Configuration Setting

    Bus Detection 3.3. Advanced Configuration Setting The following are suggested settings applicable for detecting buses with the SLD4 Loop De- tector; Suggested Bus Detection Settings Setting Value Comment Switch Config Disable This will allow for specific thresholds to be set.
  • Page 13 Monitoring and simulation page, details of which are shown in Figure 5 . See also 2.2 SLD4 Sensitivity for explanation of “Hz” versus %d/D settings. The other tabs in this application can be left to their default settings...
  • Page 14 Monitoring and simulation page, details of which are shown in Figure Note (9) Typical values assume there is no Rebar, Buried metal or Slag waste present, which will alter the frequency variations mentioned above (especially in the North East of the UK. Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 15: Additional Options

    This provides a low cost method of vehicle detection with bus discrimination from a single loop. Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 16: Tram Detection Applications

    1-2 and 3-4, this selects the low inductance range of the detector. 4.3. Advanced Tram Configuration Setting If you experience difficulties with configuring the SLD4 with the tool, then refer to section 9 “ Troubleshooting” or the General Handbook (667/HB/45200/000) for further guidance. 4.3.1.

  • Page 17: Sticking On

    10. Only consider the relay output of the detector when interpreting the performance, for example via the controller. 11. The LEDs on the front of the SLD4 detector are an indication, however the output ex- tension configuration does not influence the LEDs on the front panel.

  • Page 18: Rail Crossing Applications

    This section is concerned with vehicle approaches to rail crossings. 5.1. Rail Crossing Applications The requirements for the use of SLD4 loop detectors at railway crossings may differ from the normal use of vehicle detection within traffic control systems. Example scenario: 13.
  • Page 19 Refer to section 0 ( 4. SLD4 Loop Inductance Link Settings) 5. In the Monitoring & Simulation menu in the SLD4 Configurator software, click on the “Record All Vehicles” tab 6. Drive over each loop in question, at least five times. Each pass should result in a vehi- cle record, which includes a vehicle profile.
  • Page 20 7. Note the frequency value of the trigger threshold in AUTO Sensitivity Mode. In Figure 8 the value would be 19Hz. 8. Use the following table, which shows what sensitivity in %DL/L of the trigger thresh- old is set based on captured results. Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 21: Confirmation Of Performance

    The loop may not become spontaneously occupied (false positive) without a road ve- hicle being present. • It may be considered reasonable that the loop ‘detects’ whilst a train is passing, how- ever the loop should not detect once the train has passed. Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 22: Putting The Loop Detector Into Operation

    Rail Crossing Applications The user may choose to save the information and vehicle profiles for future reference. 1. In the Monitoring & Simulation menu in the SLD4 Configurator software, click on the Recording Ended (“Aufnahme beendet”) tab. 2. Save the recording, which creates the (.veh file).

  • Page 23: Bicycle Detection

    Loop Type for Bicycle Detection Applications The chevron loop is normally recommended for bicycle detection. A normal vehicle loop does not provide the ideal sensitivity for a bicycle. Figure 12 : Example Loop Dimensions for Bicycle Detection Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 24: Basic Setup Of Detector

    6.3. Advanced Bicycle Configuration Setting If you experience difficulties with configuring the SLD4 with the tool, then refer to section 1 “ Troubleshooting” Set the SLD4 to “(%DL/L” in the “Loop Mode” configuration and lower the threshold of the de- tector, thus increasing the sensitivity in increments of 0.02 (%DL/L loop mode) at a time until...

  • Page 25: Classification Setup

    0.12 should ensure no phantom detections occur but could decrease the motorbike detection accuracy. The user should also check that each SLD4 card is operating on a unique loop frequency (Loops 1 to 4 on each card can share the same frequency, but loops on separate cards should not have the same loop frequency).

  • Page 26: Single Loop And Double Loop

    Figure 14 : Loop Frequency To ensure normal operation the user should check that there are no loop faults or other unex- pected SLD4 faults (status codes). After clicking refresh a few times the status codes display should be blank.

  • Page 27: Mapped Classification

    (TLS vehicle classes), or a combination of both. The bins can be mapped to the digital outputs, as shown in, it is possible to map several classification bins to a single output if required. It is also possible to configure classification bins which overlap, if a vehicle meets Loop Detector Application Notes SLD4 667/HQ/45200/101...
  • Page 28 The mapped classification feature provides great flexibility in creating vehicle classes, but this feature is quite complex. The two examples below, sections 7.3.1.1 and 7.3.1.2, illustrate how this feature can be used. Contact Siemens support if additional help is required in setting up complex classification mappings...
  • Page 29 Figure 19 : Example 1 Classification bin configuration Note The additional length/speed settings allow for further customisation on top of the loop profile classification. For example, Class 1 could be configured for 8+1 Articulated <15m, and Class 2 8+1 Articulated >15m Loop Detector Application Notes SLD4 667/HQ/45200/101...
  • Page 30 Classification Setups Figure 20 : Digital output configuration Example 1 Mapping Loop Detector Application Notes SLD4 667/HQ/45200/101...
  • Page 31 Class 2, ID=4 (binary 0100), min len=4.8m, max len =5.5m, Profile class=5+1 Car These alternative mapped classification values are included in the GSPI serial interface/mes- sages, but not the SiTOS interface (reference SLD Handbook for information). Loop Detector Application Notes SLD4 667/HQ/45200/101...
  • Page 32 Classification Setups Figure 22 : Digital output configuration for Example 2 Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 33: Parking Bay Applications

    There is generally insufficient traffic flow to allow automatic settings to be use successfully. If adjacent vehicles are still detected at minimum sensitivity, then changing the loop frequency may be necessary to remove these false detects. Loop Detector Application Notes SLD4 667/HQ/45200/101...

  • Page 34: Troubleshooting

    9.2. Serial Cable connection (702/4/08535/000) Connection to the SLD4 is via the front panel 3.5mm socket and a USB to 3.5mm serial cable. The communications port and settings are set through the “Configure” button on the left hand side of the SLD4 Configurator display. The COM port for the cable will not be displayed until it is plugged into the laptop.
  • Page 35 Siemens Traffic www.siemens.co.uk/traffic Siemens Mobility http://www.mobility.siemens.com/mobility Siemens Mobility Limited Subject to change without prior notice Sopers Lane Order No. 667/HQ/45200/101 Poole © Siemens Mobility Limited, 2019 BH17 7ER For more information United Kingdom on SLD4 scan the QR code www.siemens.co.uk/traffic Unrestricted...

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