is a solid-state, pulsed radar object detection system designed to
alert vehicle operators to obstacles. The system detects both moving and stationary objects in
a pre-defined coverage area and reports the distance of the closest object via visual range
indicators and an audible signal to a vehicle operator. The PreView
tm
system is designed to
supplement other safety practices and is not to be the sole method of collision avoidance.
The Standard PreView
tm
consists of three major components: an environmentally sealed
sensor, an operator display mounted in the cab of the vehicle, and a recommended external
back up warning alarm. The Standard PreView
tm
system does not require cleaning and is not
effected by harsh weather conditions, including temperature extremes, rain, sleet, snow, or
fog.
Sensor/Antenna Description
The antenna assembly transmits and receives low power 5.8GHz radar signals. It then
processes the returned signals to determine if an object has reflected any energy back to the
sensor and reports this to the operator display. The sensor is designed to process and report
detections within ½ of a second allowing the vehicle operator to quickly respond to any object
within the detection zone. All connections to a vehicle are accomplished at the sensor. Power
is obtained from the vehicle reverse lights and a relay contact is provided for operating a back
up alarm. The connection to the display unit is through a watertight connector eliminating any
potential problems with pin corrosion. Power to the operator display is provided through the
sensor interface to the display. The sensor RF output is pulse modulated so that it will not
interfere with similar devices.
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 1 of 10
Volume Control
Buzzer
Green Power On
5 Zones
Operator Display Description
The operator display provides the vehicle operator with both visual and audible indications of a
detected object. Range to the detected object is provided with five LED’s in a relative format
with each LED representing approximately 1/5th of the total range. The display unit also
contains a buzzer to provide an audible alert. The buzzer audible rate will increase as an
object becomes closer, providing the operator with another cue that an object is being
detected.
The operator display continuously monitors communication from the PreView
tm
sensor and in
the event of a system failure or malfunction will notify the operator with a fault indication. See
Operator Display Error Indications below for further detail on fault messages.
A buzzer volume control switch is provided on the front panel of the display allowing the
vehicle operator the ability to adjust the buzzer volume to three different levels.
Button
Range Indications
Item Description
Green Power ON Illuminates continuously after power is applied to the system. The
power ON LED will blink quickly if a system malfunction occurs.
Range
Indications
Illuminate to give operator a relative distance measurement to the closet
detected object. LED’s operate from the right to the left, with the closer
an object the more LED’s illuminated. Also used for error codes.
Buzzer Sounds audible tones to alert operator of obstacles. The buzzer tone
rate will increase as the vehicle gets closer to an object.
Volume Control
Switch
This momentary push button switch allows three different buzzer volume
levels to be selected as well as providing the capability of turning off the
buzzer.
Table 1. Operator Display Description
Object Detection Capability
The Standard PreView
tm
system can detect most objects within the detection zone. However,
there are some instances where objects can go undetected. Obstacle size, shape, and
composition are all factors determining if, when and where an object is detected. The PreView
tm
system operates by transmitting a pulse of very low power electromagnetic energy. Any
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 2 of 10
energy that strikes an object reflects a certain amount of this energy back to the PreView
he
Obj
e
ct in the PreView™ syst
e
m d
etection zon
e
Object su
r
faceat A 45 degree angl
e to the
P
reView™ senso
r
Transmi
t
ted sig
nal
Object in the PreView™
system detection zon
e
gnal returns to the
ew™ senso
r
Object surface at a 90 degree angle to the PreView™sensor
°
sensor. This returned energy is measured to determine an object’s distance.
The amount of energy returned is based on a few factors:
Size – a larger object usually reflects more energy than a smaller object.
Distance – the farther away an object is, the less energy is returned.
Composition – a metal object reflects more energy than a non-metallic object. A metallic
object at the edge of the zone will be detected, where a wood object may not.
Scattering – a solid object reflects more energy that a non-solid object such as wood,
gravel, bushes, etc.
Angle – an object perpendicular to the sensor will reflect more energy than an object at
an angle. See below for a detailed explanation.
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Minimal refle
Ful
l
reflection
ction
PreView
sensor
sig
n
al doesn’t return
PreView
senso
Reflected s
PreVi
™
Reflected
PreView™
™
r
i
Trans
sign
s
ensor
itted
m
a
l
to t
Figure 1. Object Reflection
Preco Electronics, Inc.
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 3 of 10
370-871-1B
SPECIFICATIONS (Typical)
Sensor: Pulsed RF Transmitter at 5.8GHz.
Electronics: Solid state
Sealing: Encapsulated to protect from dust, moisture and vibration.
Radar Sensor: 5.25” diameter x 1.25" deep (13.3cm x 3.2cm)
Operator display: 1.00”H x 2.25"W x 2.00"D (2.5cm x 5.7cm x 5.1cm)
Weight:
Radar Sensor: 1.XX lb. (0.5XX kg)
Operator display: 0.25 lb. (0.11 kg)
Mounting:
Radar Sensor: Three 0.xxx" (x.xmm) diameter.
Operator display: User dependent
Operating Temperature: All units: -40oF to +185oF (-40oC to +85oC)
ELECTRICAL SPECIFICATIONS
Input Voltage: 9 – 33 volts DC
Input current: 0.25 amp maximum.
Polarity: Polarity protected
Power Connection: Two 18 AWG wires
Relay Output: Form C (Normally Open), 1 amp maximum continuous
MAINTENANCE
Daily: Follow test and maintenance procedure.
REGULATORY COMPLIANCE
Compliant with FCC Part 15.249 (5725-5875MHz).
FCC ID: OXZSTDPREVIEW
PRODUCT MANUFACTURED IN THE USA
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.
Warni
ng: 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.
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 4 of 10
INSTALLATION INSTRUCTIONS
Before you Start
Prior to installing the Standard PreView
yourself with the installation instructions, theory of operation, and system components. Check
the contents of the shipping package and verify the following items are included:
sensor mounting location is key to proper system operation. Ideally the sensor
should be mounted on the rear center of the vehicle at roughly 36” (1M) +/- 12” (0.3M) above
the ground. The sensor should be perpendicular to the ground. Select a location that will
provide some protection from impact and debris while allowing an unobstructed view of the
target hazard area.
Before the PreView
tm
system is permanently installed to the vehicle verify that the selected
sensor mounting location provides a clear detection zone. This can be done by applying
power to the system with the sensor in the proposed location and verifying that nothing is
being detected.
Sensor/Antenna Mounting
1. Select the appropriate sensor mounting location.
2. The sensor must be mounted with the cable exit either on the bottom (preferred) or top.
3. Using the sensors’ mounting holes as a template, scribe position marks through the holes.
Drill 9/32” (7mm) holes centered at the marks. (CHECK THESE DIMENSIONS)
4. Secure the sensor to the vehicle with the three supplied 10-24 UNC bolts, washers and
nuts or equivalent. Apply a maximum torque of xx inch pounds when securing the sensor.
Sensor Power Connection
Locate the vehicles reverse light power wire and connect to the red wire on the sensor harness
using 18AWG wire. Connect the black wire of the sensor harness to vehicle ground.
tm
Object Detection System take time to familiarize
IImmppoorrttaanntt!!
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 5 of 10
Back Up Alarm Electrical Connection
The PreView
activate an external back up alarm. The PreView
tm
sensor provides a form C (normally open) relay contact that can be used to
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system activates this relay output
whenever an object is detected. The orange and white wires on the sensor harness are the
interface to this relay contact.
The PreView
tm
sensor does not provide power for a back up alarm.
NNOOTTEE::
Display Unit Installation
The display unit should be mounted where the vehicle operator can easily view it while
backing. The ideal location for this is on the dash by either windshield pillar. This will allow the
operator view of the display while also looking out one of the side mirrors.
The display unit harness should be taken into consideration when selecting a mounting
location for the display. Since the connection between the display and sensor harness is not
watertight, it should be routed in such a manner so it is not exposed to the outside
environment.
The PreView
tm
display unit comes equipped with a mounting bracket and hardware. If
desired, the display unit can be mounted to the display bracket with the supplied hardware.
This bracket can then be mounted in the vehicle cab as desired.
Cable Installation
The interconnect cable between the sensor and display is 25 feet (7.6M) in length. If the
distance between the sensor and display is greater than 25 feet, contact Preco for additional
cable extensions.
Routing of the cable should start at the sensor end since the display end comes equipped with
a grommet for sealing the entry point into the cab. Allow for a small service loop in the cable at
the sensor and secure the cable every few feet (~1M) with tie wraps. When ready to enter the
cab, drill a 9/16” (14mm) hole and feed the display connector through. Once the connector is
through, the grommet can then be pulled into the hole until snug. The remaining length of
cable is then routed to the display unit and the connectors are fitted together with the
connector latch engaged. Care should be taken to not route the cable next to heat sources
such as engines and exhausts and areas that may see abrasion or rock damage.
Initial System Power Up and Test
Once the sensor and display are installed, wired, and connected, power should be applied to
verify correct system operation. Upon power up, the display will go through its self-test by
illuminating all LED’s and sounding the buzzer. When the system is operating correctly in an
open field with no obstructions, the green power LED will be the only light illuminated. If all the
detection (yellow) LED’s are lit, check for any obstruction which may be detected by the
sensor. If possible move the sensor so it is not detecting the object(s). If it is not possible to
relocate the sensor, then consult the factory. It may be possible to ignore the obstruction.
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 6 of 10
If for some reason the system is malfunctioning, all of the yellow LED’s will be flashing and the
buzzer will be sounding. Refer to the Error Indications and Troubleshooting sections below to
determine the error and solution.
Once the system has been installed, the detection zone should be tested. Testing is
accomplished by using two individuals. One individual is engages the parking brake and
places the vehicle in reverse. The other individual then walks through the detection zone
noting where the display buzzer or the back up alarm activates. By moving about the rear of
the vehicle and noting when the display or back up alarm activate, an accurate detection zone
can be mapped.
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 7 of 10
COMMON INSTALLATION PROBLEMS AND TROUBLESHOOTING
Display power ON green LED is not illuminated.
• Verify that keyed DC power is applied to the sensor (+12V to red wire and ground to
black wire).
• Verify that the cable between the sensor and display is connected.
Display continuously flashes.
• Check connection between display and sensor.
• If sensor had just been connected to the service tool, cycle power to sensor after
connecting to display.
• If the system has multiple sensors, verify that ‘Y’ interconnect cable is correctly installed
with the connector with the gray molding connecting to the sensor that is farthest away
from the display.
All the display LED’s are illuminated when sensor is mounted.
• Verify the sensor is pointing outward from the vehicle in an open area with no
obstructions. This may require removing the mounting screws and lifting the sensor out
away from the rear of the vehicle. If the display LED’s are not active when moved away
from the vehicle, but are active when mounted, then either a special bracket must be
used to move the sensor away from the obstruction or a calibration must be performed.
See the service tool user manual for further details on how to perform a calibration.
Back up alarm does not operate when connected to the PreView
• Verify that the sensor reverse input (blue wire) is connected to the vehicle’s reverse
indication.
• Verify that the sensor’s orange wire is connected to the back up alarm positive (+) input
and the white wire is connected to the back up alarm negative (-) input.
• Disconnect all other back up alarm connections to the vehicle.
Sensor is detecting the ground, indicated by a few of the display LED’s being lit.
• In an open field, either move the sensor up higher or slightly angle the sensor upward 2
to 5 degrees. The minimum recommended mounting height is 30 inches. Contact
Preco for an angle bracket if one is required.
Cable between display and sensor is too short.
• Contact Preco for an extension cable. This cable is placed between the sensor and
display cable and comes in 5’, 10’, 15’ and 25’ increments.
Detection pattern seems wider when a vehicle is detected rather than a person.
• This is normal since any vehicle presents a larger radar cross section than a person. If
desired, modify the configuration by either shortening the range or going to a narrower
pattern.
tm
sensor.
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 8 of 10
MANUFACTURER 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 extends for twelve (12) months from the date of
manufacture. Manufacturer will, at its option, repair or replace any product found by
Manufacturer to be defective and subject to this Limited Warranty.
This Limited Warranty does not apply to parts or products that are misused; abused; modified;
damaged by accident, fire or other hazard; improperly installed or operated; or not maintained
in accordance with the maintenance procedures set forth in Manufacturer's Installation and
Operating Instructions.
To obtain warranty service, you must ship the product(s) to the specified Manufacturer location
within thirty (30) days from expiration of the warranty period. You must fill out the warranty
claim form and include the form with the product. You must prepay shipping charges and use
the original shipping container or equivalent. Return shipping charges within the United
States, Canada, and Puerto Rico, will be paid by Manufacturer. This Limited Warranty will
apply only to a product purchased and located in the United States, Canada, or Puerto Rico.
EXCLUSION OF OTHER WARRANTIES: MANUFACTURER MAKES NO OTHER WARRANTIES,
EXPRESSED, IMPLIED OR STATUTORY. THE IMPLIED WARRANTIES FOR MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY EXCLUDED AND SHALL NOT
APPLY TO THE PRODUCT. BUYER'S SOLE AND EXCLUSIVE REMEDY IN CONTRACT, TORT OR
UNDER ANY OTHER THEORY AGAINST MANUFACTURER RESPECTING THE PRODUCT AND
ITS USE SHALL BE THE REPLACEMENT OR REPAIR OF THE PRODUCT AS DESCRIBED ABOVE.
LIMITATION OF LIABILITY: IN THE EVENT OF LIABILITY FOR DAMAGES ARISING OUT OF THIS
LIMITED WARRANTY OR ANY OTHER CLAIM RELATED TO MANUFACTURER'S PRODUCTS,
MANUFACTURER'S LIABILITY FOR DAMAGES SHALL BE LIMITED TO THE AMOUNT PAID FOR
THE PRODUCT AT THE TIME OF ORIGINAL PURCHASE. IN NO EVENT SHALL MANUFACTURER
BE LIABLE FOR LOST PROFITS, THE COST OF SUBSTITUTE EQUIPMENT OR LABOR,
PROPERTY DAMAGE, OR OTHER SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES
BASED UPON ANY CLAIM FOR BREACH OF CONTRACT, NEGLIGENCE OR OTHER CLAIM,
EVEN IF MANUFACTURER OR A MANUFACTURER'S REPRESENTATIVE HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES. Manufacturer shall have no further obligation or liability
with respect to the product or its sale, operation and use, and Manufacturer neither assumes
nor authorizes the assumption of any other obligation or liability in connection with such
product.
This Limited Warranty gives you specific legal rights, and you may also have other legal
rights, which vary, from state to state. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above exclusion or limitation may not apply to
you.
Any oral statements or representations about the product, which may have been made
by salesmen or Manufacturer representatives, do not constitute warranties. This Limited
Warranty may not be amended, modified or enlarged, except by a written agreement signed by
an authorized official of Manufacturer that expressly refers to this Limited Warranty.
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 9 of 10
tm
PREVIEW
DAILY MAINTENANCE
Detach this page and place with daily operator maintenance procedures
Safety Message to Operators of Vehicles with PreView
1. The PreView
defense for the safe operation of the vehicle. It should be used in conjunction with established safety programs and
procedures to augment the safe operation of the vehicle, ground personnel, and adjacent property. Should the system
become inoperative, it could jeopardize the safety or lives of those who depend on the system for safety.
2. Testing and inspection of the system in accordance with these instructions and record of the results should be listed on
the daily maintenance report. The units on operating vehicles must be tested each day prior to the vehicle's operation.
Results of this test must be recorded in the maintenance log.
3. People operating this equipment MUST check for proper operation at the beginning of every shift or safety inspection
period.
4. People's lives depend on the proper installation of this product in conformance with these instructions. It is necessary to
read, understand and follow all instructions shipped with the product.
5. Failure to follow all safety precautions and instructions may result in property damage, serious injury, or death.
6. The PreView
good understanding of truck electrical systems and procedures, along with proficiency in the installation.
7. Store these instructions in a safe place and refer to them when maintaining and/or reinstalling the product.
tm
system is intended as an Object Detection System and should not be relied upon as your first line of
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Object Detection System is intended for commercial use. Proper installation of a back-up aid requires a
Testing and Maintenance
NOTE: A walk around test shall be performed every day to verify proper function of the system and to familiarize the operator
with the zone of detection. More frequent inspections should be performed when:
The vehicle is operating in a particularly dirty or harsh environment.
The operator has reason to suspect the system has been damaged.
This test should be performed with two people, one who remains in the cab (the operator), and one who walks through the
sensor field to the rear of the vehicle (the assistant).
1. Clean the black sensor surface of any accumulation of dirt, mud, snow, ice, or debris.
2. Visually inspect the attached wiring and cable and verify that they are properly secured, not chafing or dangling free
where they could become snagged and damaged. Inspect the Radar Sensor and Operator Display Module and verify that
they are securely attached to the vehicle.
3. Start the vehicle, set the park brakes, and place the vehicle in reverse.
4. Verify the green “POWER” light is illuminated on the in-cab display.
5. The area to the rear of the vehicle should be clear of obstacles for a distance of 8 meters. If the display shows any
indicator other than the green light then there are objects to the rear of the vehicle that will interfere with the test. Move
the vehicle to a clear area and proceed.
6. The assistant should move to the rear of the vehicle and to the side so that he is in sight of the operator's mirrors. He
should begin ½ meter (20”) to the rear of the rearmost part of the vehicle. As the assistant walks towards the centerline of
the vehicle parallel to the rear, the external backup alarm will activate, signifying the sensor has detected him. Upon
hearing the backup alarm the operator should verify all the display LED’s are lit and the audible alarm is quickly pulsing.
Note: If an external backup alarm is not connected, the operator will notice a detection only by the display LED’s and
buzzer operation and communicate the detection or lack of detection to the assistant as the assistant moves through the
area to the rear of the vehicle.
7. The assistant should continue walking through the area at the rear of the vehicle noting the area that detection occurs.
8. Now walk from the center of the rear of the vehicle straight back, away from the vehicle. When the alarm quits sounding
the detection limit has been reached.
9. Move halfway back and remain still for a few seconds, the alarm should continue to sound, demonstrating the system’s
ability to detect a still object.
10. The assistant should walk the complete rear of the vehicle noting the detection edges of the entire coverage area.
11. After the test the assistant needs to communicate to the operator the details on where detection started and stopped to
the rear of the vehicle.
For Questions call 1-800-453-1141 between 7:00 AM and 5:00 PM Mountain Standard Time
tm
Systems
Preco Electronics, Inc.
370-871-1B
415 N. Maple Grove, Boise, ID 83704 (800) 453-1141 Copyright 2002 Page 10 of 10
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