PreView® Sentry™ ST82XXX & ST87XXX Series Sensor Operating Manual www.preco.
FCC STATEMENT This device complies with Part 15 of the FCC Rules. 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 undesired operation. Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Contents Overview .............................................................................................................................................. 1 Product Description ................................................................................................................................. 1 Other Sensor Features............................................................................................................................. 4 Sensor Interfaces and Configuration ...........
Figure 13. Object Reflection ......................................................................................................
Overview This document describes the PreView® Sentry™ radar sensor manufactured by Preco™ Electronics, Inc., located in Boise, Idaho, USA. The document does not claim to cover all the possible applications or deployment areas for these devices. This document may be amended, corrected, and enhanced in keeping with the sensor development progress. Product Description The PreView® Sentry™ is a small, rugged, short/medium range radar sensor (operating at 24.00 – 24.
Figure 2. Adjustable Detection Zone The PreView® Sentry™ radar sensor has multiple models with preconfigured detection zones: both Range and Width of detection zone. Note: the Preco.com website contains the most current data on radar sensor models. PreView® Sentry™ ST87xxx Series radar sensors include an 8-pin Deutsch connector pigtail as shown in Figure 1. The PreView® Sentry™ ST82xxx Series radar sensors use an 8-pin Conxall connector on the back of the radar. Table 1.
Figure 3. Detection Zone (FOV) 3M Figure 4 below illustrates a mining haul truck backing application with the radar detection zone set to a Range of 30m and a Width of 10m. Figure 4. Detection Zone (FOV) 10M The PreView® Sentry™ radar sensor utilizes a single beam monopulse radar architecture. This architecture uses a single radar beam across the field of view to determine the range, velocity, and angle of targets. The transceiver design is based on a SiGe MMIC chipset operating in the 24 GHz ISM band.
Other Sensor Features The PreView® Sentry™ radar sensor has a continuous Built-In-Self-Test (BIST) that notifies the operator display of sensor failure within a fraction of a second. This test functions by monitoring the transmit and receive performance as well as other internal operations. The PreView® Sentry™ radar sensor can also determine if the face of the sensor is blocked with excessive ice, mud, or snow that is impeding proper operation. This blockage is then reported to the operator display.
Sensor Interfaces and Configuration Communication The PreView® Sentry™ radar sensor has one CAN interface as specified in ISO 11898-2 with a transmission rate of 250 KBits/second. The CAN Bus is internally terminated with a 120 ohm resistor between CAN H and CAN L. The sensor communicates with the operator display (HMI) using this interface. Since CAN is a standard communication interface, the sensor can be connected to other CAN controllers, telematics interfaces, displays, etc.
Figure 5. Deutsch Connector Pin Out (ST87xxx Series) Figure 6 below shows the pinout for the Conxall connector (ST82xxx Series). The mate for the Conxall connector is P/N 6280-8SG-XXX Insert Figure 6 for Conxall Connector Pin Out (ST82xxx Series). Figure 6. Conxall Connector Pin Out (ST82xxx Series). Preco™ Electronics provides a variety of different cable lengths and configurations for the PreView® Sentry™ radar sensor, as well as solution kits of radar, cabling and displays.
Figure 7.
Measuring Performance Range: Range Accuracy: Azimuth Field of View: Elevation Field of View: Angle Accuracy: Velocity Range: Velocity Accuracy: Target Resolution: Cycle Time: 0 – 30m (10dBsm target) depending on model number 0.3m ±75 degrees (10dBsm target) ±10 degrees (10dBsm target) ±2° @ ±10° FOV, ±5 @ ±30° FOV, ±10 @ ±75° FOV ± 9 meters/sec (± 20 mph) 0.2 meter/sec (0.5 mph) 1.4m for static targets, approaching 0.3 meters for dynamic targets 120ms (A CAN bus target message is provided in every cycle.
Regulatory Compliance The PreView® Sentry™ radar sensor is compliant with the following countries/regions and their regulations as of the published date of this manual. The sensor may be compliant in other countries/regions. Please check your local regulations. United States - Federal Communications Commission - Part 15.
Installation Sensor Mounting The PreView® Sentry™ radar sensor mounting location is important for proper system operation. Ideally the sensor should be mounted on the rear of the vehicle as close to the center as possible at roughly 36” (1m) above the ground. The sensor face should be perpendicular to the ground with the small end of the “V” graphic on the sensor face pointing down.
Figure 9. Vertical and Horizontal Angle Mounting Tolerances Exceptions: if mounting higher than 4 feet (1.3m), the sensor can be angled down a few degrees as necessary. (Insert diagram/chart showing mounting heights vs. angles) Figure 10. Mounting Angle Height Exceptions The performance of the sensor can be negatively impacted if the sensor is angled down, causing false detection from the ground. Any time the sensor is not perpendicular to the ground, the performance should be tested.
Horizontal “Keep Out” Zone Vertical “Keep Out” Zone Figure 11.
The sensor’s horizontal field of view is +/- 75 degrees and the vertical field of view is +/- 10 degrees. For optimal performance, the sensor should protrude beyond any other portion of the vehicle. Important! Before permanently installing the PreView® Sentry™ radar sensor on the vehicle, verify that the selected sensor mounting location provides a clear detection zone.
Figure 12. Adjustable Mounting Bracket 3. Using the provided drill template, scribe position marks through the holes. Drill 1/4” (6mm) holes centered at the marks. 4. A 1.5” (40mm) diameter clearance hole is required for the sensor connector and mating cable connector. 5. Secure the sensor to the vehicle with the four supplied #10-24 UNC button head screws, washers, and locking nuts or equivalent. Apply a maximum torque of 22 lb-inch (25 kg-cm) when securing the sensor.
Initial System Power Up and Test This is more of a system (Quick Start Guide) thing, but do we want to put it here as well? 15
Object Detection Capability The PreView® Sentry™ system is a blind spot collision warning system designed to supplement other safety practices and/or devices. The machine operator is always the first line of defense when safely operating a vehicle. The person or owner responsible for the equipment must ensure that all operators understand the installation, operation, limitations and safe use of the system. The PreView® Sentry™ radar sensor can detect most objects within the detection zone.
Minimal reflection Object surface at A 45 degree angle to the PreView™ sensor PreView™ sensor Transmitted signal Object in the PreView™ system detection zone Reflected signal doesn’t return to the PreView™ sensor Full reflection PreView™ sensor Transmitted signal Reflected signal returns to the PreView™ sensor Object in the PreView™ system detection zone Object surface at a 90° degree angle to the PreView™sensor Figure 13.
Notes on Safety and Risks Owner Responsibilities The owner is responsible for ensuring that the device (and equipment) are used for their intended purpose, for the actions of the employees, for giving instruction to the employees, and for the operational safety of the equipment. The owner must understand the safety information for the device and the instructions given in the operating manual. Lacking or incomplete training can lead to incorrect operation or improper usage.
PreView® Sentry™ Daily Maintenance Detach this page and place with daily operator maintenance procedures. Safety Message to Operators of Vehicles with PreView® Sentry™ Systems 1. The PreView® Sentry™ system is intended as an Object Detection System and should not be relied upon as your first line of defense for the safe operation of the vehicle.
10. The assistant should walk the complete rear of the vehicle while the operator notes the detection edges of the entire coverage area. 11. After the test, the operator and the assistant need to communicate the details on the detection zone. For questions, call 1-866-977-7326 toll free in the USA, send a fax request to 1-866-929-6769, or submit an online request at www.preco.com/contact-us/ . A safety specialist will respond within 24 hours.
Warranty Information MANUFACTURER STANDARD LIMITED WARRANTY AND LIMITATION OF LIABILITY Manufacturer warrants that on the Date of Purchase this Product will conform to Manufacturer's published specifications for the product, which are available from Manufacturer on request, and Manufacturer warrants that the product is free from defects in materials and workmanship. This Limited Warranty for the sensor extends for sixty (60) months from the date of shipment.
