HME DU3 Installation and operating instructions

INSTALLATION/MAINTENANCE INSTRUCTIONS
Figure 1. Typical DU3 installation site
Figure 2. DU3 detector unit
DU3
Ultrasonic Vehicle Detector
The DU3 is a vehicle detector unit with self-
contained electronics, designed for use with a
drive-thru timer system. It should be installed at
the service window, not at the menu board or
speaker post.
Installation of the DU3 requires only one hole to
be drilled through the wall for cable routing, and
four screw holes for mounting the detector unit
on the outside wall of the building, near the
drive-thru service window. Its cables will be
routed to the AC adapter and the timer system
control unit.
Installation of the DU3 should take approximately
one hour. Follow these instructions.
Parts List
The following parts are included with the DU3. As the items are
unpacked, check them against the packing slip. If any item is
missing or damaged, contact your HME sales representative.
!! Detector unit with 12 ft. (3.66 meter) cables
!AC adapter
!Mounting hardware
Tools Required
Be certain you have the items listed below before beginning
the DU3 installation.
!! Tape measure
!Phillips (cross point) and standard (slotted) screwdrivers
!Electric drill with ½ inch (13mm) and ¼ inch (6mm) bits to
drill the mounting surface (wood, cinder block or metal)
where detector unit will be installed
!Electrical tape or shrink tubing
HM ELECTRONICS, INC. 14110 Stowe Drive, Poway, CA 92064 USA !Phone: [phone] Fax: [phone]
HME# 400251
Rev B 11/13/02

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1. Detector unit mounting
Figure 3. Typical DU3 position on building near drive-thru service window
Figure 4.Mounting the DU3 detector unit
Determine where the detector unit will be mounted on the outside wall of the building. (See Figure 3.)
NOTE: Be certain there is an available AC electrical outlet near the mounting site, on the wall inside the
drive-thru service area.
!Drill a ½ inch (13mm) hole through the wall at the
location where the detector unit will be mounted.
!Hold the unit centered over the hole, against the
outside wall, and mark the wall through the four
holes at the corners of the unit.
!Drill four ¼ inch (6mm) screw holes at the
marked spots, deep enough to insert the
enclosed screw anchors.
!Insert the enclosed screw anchors completely
into the four screw holes.
!Route the 12 ft. (3.66 meter) cables from the
back of the detector unit through the ½ inch
(13mm) center hole.
!Hold the detector unit with the arrow on its top-
front pointing up (Figure 4), and the screw holes
at its four corners over the screw anchors on the
wall. Push any slack cable back through the
center hole into the building.
!Screw the four enclosed screws through the
screw holes in the detector unit (Figure 4)
and into the screw anchors, to fasten the unit
securely to the outside wall.

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2. Cable routing and connections
NOTE: Connections are not polarity sensitive.
Figure 5. DU3 cable routing and connections
3. DU3 Operational check
!Inside the drive-thru service area, route the end of the smaller cable from the detector unit to the
control unit of the drive-thru timer system. Connect the cable wires to the vehicle detector input of
the control unit. NOTE: If the smaller cable from the detector unit is not long enough, up to 188 ft
(57 meters) of additional two-conductor (24 AWG) audio cable (or equivalent) can be spliced to it.
Cover splices with electrical tape or shrink tubing.
!Route the larger cable coming through the wall from the DU3 to the AC power adapter. Connect the
wires of this cable to the two outer screws on the bottom of the AC adapter, as shown in Figure 5.
NOTE: If the larger cable from the detector unit is not long enough, up to 188 ft (57 meters) of
additional two-conductor (16 AWG) cable (or equivalent) can be spliced to it. Cover splices with
electrical tape or shrink tubing.
!Plug the adapter into an AC electrical outlet.
THE DU3 INSTALLATION IS NOW COMPLETE. THE DU3 SHOULD BE OPERATIONAL.
!Go outside and listen for a clicking sound from the detector unit. It should click continually, each time
it sends out a pulse.
!Have a vehicle driven up to the drive-thru service window. Check to be certain the DU3 has activated
the timer system when the vehicle arrived (approximately 2 second delay). Have the vehicle driven
away to be certain the timer system is deactivated (approximately ½ second delay).
NOTE: The window of detection is factory set to detect an object between 1½ and 7 feet
(460 mm - 2.140 meters).

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4. Troubleshooting and Correcting Problems
TROUBLESHOOTING CHECKLIST
Problem Probable Cause Solution
No clicking sound is heard from AC adapter is not properly 1. Be certain larger cable from
DU3 detector unit. connected. detector unit is connected to
AC adapter.
2. Be certain adapter is
plugged into AC electrical
outlet.
3. If clicking sound is still not
heard, call HME. *
Clicking sound is heard at The timer system or 1. Short the connectors at
DU3 detector unit, but DU3 detector unit may be vehicle detector input of
drive-thru timer system malfunctioning, or the cable timer system control unit.
is not activated. from the timer system may be (See Figure 5)
defective. CIf vehicle-detect signal is
notnot heard or seen, timer
system is defective.
Check timer system.
CIf vehicle-detect signal is
heard or seen, timer
system is OK. Problem
may be with detector unit.
Call HME.
2. If cable is spliced, short the
timer system cable wires at
the splice. (See Figure 5)
CIf vehicle-detect signal is
notnot heard or seen, cable
from timer system is
defective. Replace cable.
CIf vehicle-detect signal is
heard or seen, detector
unit is malfunctioning.
Call HME. *
* For assistance, call HME Customer Support at 1-800-848-4468.

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5. Specifications
A. Voltage input: 16VAC
B. AC current: 100mA Minimum, 3A Maximum
C. Operating temperature range: -40 F to 122 F(-40 C to 50 C)
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D. Internal Heater: Active below 50F(10 C)
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C. Acoustic Characteristics: Ultrasonic, Frequency 50kHz
D. Angle of Detection: Target must be perpendicular ± 15 @ 3 feet (.91 meter).
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E. Detection Range: 1 to 7 (±1) feet (.30 to 2.13 meter, ±.30 meter)
F. Turn On Delay: 2 (±.5) seconds
G. Turn Off Delay: .5 (±.3) seconds
H. Connectors: None
I. Controls: None
J. Indicators: None
K. Vehicle Detection Output: Relay Closure (SPST, normally open)
Maximum Switching Power, 10VA
Maximum Switching Voltage, 100VDC or peak AC
Maximum Switching Current, 0.50 A
Maximum Carry Current, 1.00 A
L. Cables: AC Power Input:
2 conductor (16 AWG) cable 12 feet (3.66 meters) long.
Vehicle Detector Output:
2 conductor (24 AWG) cable 12 feet (3.66 meters) long.
Cables can be extended to 200 feet (61 meters) maximum.
M. Weight: 1.5 lbs (.68 Kg)
N. Dimensions: 4.6 x 5.6 x 3.9 inches (116.84 x 142.24 x 99.06 mm)

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FCC NOTICE
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment is operated
in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the installation/maintenance instructions, may cause
harmful interference to radio communications. Operation of this equipment in a residential area is likely
to cause harmful interference in which case the user will be required to correct the interference at his own
expense.
CAUTION: Changesor modifications not expressly approved by HME could void the users authority
to operate this equipment.