Reno A&E U-1000 User manual
Model U-1000
Loop Detector
Operations Manual
Four Channe l Menu Drive Programmable Inductive Loop Vehicle
Detector
Built-in Loop Analyzer for Each Channel
This manual contains technical in formation for the
Model U-1000 Loop Detector
Pn 889-2103-01 Revision: April 2020
THE FOLLOWING PRODUCT WAS DESIGNED, INSPECTED , TESTED AND
MANUFACTURED IN THE USA BY EBERLE DESIGN, INC. IN PHOENIX, ARIZONA.
INFORMATION CONTAINED HEREIN IS PROPR IETARY TECHNICAL INFORMATION OF
EBERLE DESIGN, INC. PUBLICATION, REPRODUCTION OR USE IN WHOLE OR PART IS
NOT PERMITTED EXCEPT UNDER TERMS AGREED UPON IN WRITING. ALL
REGISTERED TRADEMARKS OF EBERLE DESIGN INC. ARE UNDER
IT IS AN EBERLE DESIGN, INC. RECOMMENDATION THAT EACH UNIT BE TESTED
AT LEAST ANNUALLY TO ENSURE COMPLIANCE WITH FACTO RY
SPECIFICATIONS AND MEETS PROPER OPERATIONAL STANDARDS. THE
RESULTS OF THIS TESTING WILL BE DOCU M EN T ED .
© COPYRIGHT
MAINTENANCE NOTE
Model U-1000 Operations Manual
Table of Contents
Section 1 General Description ......................................................................................... 1
Section 2 General Characteristics ................................................................................... 3
2.1 Loop Frequency ..................................................................................................... 3
2.2 Sensitivity ............................................................................................................... 3
2.3 Presence / Pulse .................................................................................................... 3
2.4 Call Delay ............................................................................................................... 3
2.5 Call Extension ........................................................................................................ 3
2.6 Max Presence Timer .............................................................................................. 3
2.7 End-Of-Green (EOG) ............................................................................................. 4
2.8 Option 1: Loop Inductance Display ......................................................................... 4
2.9 Option 2: Loop Inductance -∆L/L Display ................................................................ 4
2.10 Option 3: Call Extension Control ........................................................................... 4
2.11 Option 4: Noise Filter Disable ............................................................................... 4
2.12 Option 5: Phase Green Loop Compensation ........................................................ 4
2.13 Option 9: Third Car Passage ................................................................................ 5
2.14 Option 10: Directional Logic.................................................................................. 5
2.15 Option 11: Audible Detect Signal .......................................................................... 6
2.16 Option 12: Detector Disconnect ............................................................................ 6
Section 3 Specifications .................................................................................................. 8
3.1 Physical.................................................................................................................. 8
3.2 Electrical ................................................................................................................ 8
3.3 Operational ............................................................................................................ 8
3.4 Table: Sensitivity, -∆L/L, and Response Time......................................................... 9
3.5 Table: Default Settings .......................................................................................... 9
3.6 Table: Pin Assignments .........................................................................................10
Section 4 User Interface ..................................................................................................11
Section 5 Installation and Set-Up ...................................................................................12
5.1 Program Mode Display Screens ............................................................................12
5.2 Normal Mode Display Screens ..............................................................................16
5.3 Loop Fail Indications .............................................................................................19
5.4 Setting Sensitivity Using the Bargraph ...................................................................19
5.5 Setting Sensitivity for Motorcycle Detection Using the Bargraph ............................20
5.6 Full Restore to Factory Default Settings ................................................................20
5.7 Display Test ..........................................................................................................20
Section 6 Block Diagram .................................................................................................21
Section 7 Theory of Operation ........................................................................................22
Section 8 Maintenance and Troubleshooting ................................................................23
8.1 Troubleshooting Power Problems ..........................................................................23
8.2 Troubleshooting Initialization Problems .................................................................23
8.3 Troubleshooting Loop Fail Problems .....................................................................24
8.4 Troubleshooting Intermittent Loop Fail Problems ...................................................25
8.5 Troubleshooting Intermittent Detector Lock-Ups ....................................................25
8.6 Troubleshooting Delay Problems ...........................................................................26
8.7 Things to Know About Loops .................................................................................26
Section 1 General Description
This product manual was written for people installing, operating, a nd maintaining the R eno A & E Model U-1000
Series inductive loop vehicle detector. The Model U-1000 Series consists of two versions. The Model U-1200 is a
four c ha n ne l, shelf mount t ype inductive lo op vehic le detector des igned to meet or excee d NEMA Standards T S 1-
1989. The Model U-1100 is a four channel, s helf mount t ype ind uctive loop vehic le dete ctor des igned specifica lly
to conform to the specifications s et forth in paragraph 86-5.01A (3b) of the 1981 version o f the Caltrans Standard
Specifications.
A front panel mounted, 4 pin, circular pla stic connector and 10 foot wiring harness have bee n included with the
Model U-1000 detector to support Phase Green Inputs (Delay ove rr ides) for each channel. These inputs are used to
control delay timing, phase green loop compensation, end-of-green, third car passage or detector disconnects. If
these functions are required and cannot be accomplished satisfactorily through the controller, appropriate
connection of the wiring harness will allow the detector to perform them.
The Model U-1000 uses a microcontroller to monitor and process signals from the loop / lead-in circ uits, Phase
Green I nputs, and t he reset inp ut. It uses these input s to determine how to control the four detector channel
outputs. A Liquid Crystal Display (LCD ), four light e mitting diodes ( LEDs), and four fro nt panel pushb uttons are
used to display and program all detector functions. Several diagnost ic modes are available to aid technicians and
service personnel in troubleshooting detection problems.
The use of a LCD is what distinguishes this detector from that of other manufacturers. It allows more informat ion,
never before available, to be displayed to the user during normal operation of the detector. The LCD makes it easy
to view and adjust all programmable detector opt ions and settings. It is no longer necessary to check o r change
detector settings with DIP sw itches. An eight-segment bargraph at the top of the L CD can be used to provide a
graphical representation of the relative change of inductance as seen by the detector at the current sensitivity level.
The bargraph automatically takes into account loop size, loop inductance, nu mber of loops, number of turns, loop
geometry, lead-in length, etc. The bargraph functions as a sliding scale that relates to the programmed Sensitivity
Level. The first (left-most) bargraph segment represents the minimum inductance change necessary for the
detector to output a call at the currently selected sensitivity level. Larger inductance changes will indicate more
segments. Each additional segment indicates that the next sensitivity level has also been met or exceeded. When
used in t his manne r, the bar graph prov ides an ind ication of whether the sensitivity is set too high or too low,
facilitating the ideal setting of the se ns itivity level.
All programmed settings are stored in non-volatile memory and can only be changed by programming new
settings. Loss of power or a detector reset will not change any of t he programmed settings. If a loop failure
occurs, the LCD will display the type of lo op failure as L lo (for -25% change or s horted loop conditions) or L hi
(for +25% change or open loop c onditions). Each loop failure is co unted and accumulated in the Loop Failure
Memory. The number of failures since the las t detector reset or power interruption is very useful information
during analysis of intermittent loop operation.
The Model U-1000 Series detector is a scanning detector. The scanning operation sequentially activates the ON
and OFF cycle of each channel’s oscillator. Since only one channel’s loop(s) is (are) active at a given time,
crosstalk between adjacent loops connected to the same scanning detector is minimized. The Model U-1000
Series’ unique scanning process also disconnects the capacitors and dampens the oscillator during the off cycle.
This eliminates oscillation past the OFF point (ringing or deca y) every time the loop circuit is scanned which can
result in crosstalk.
When operating in the Program Mode, the Model U-1 000 Series d isplays the rea l time loop frequency reading for
each channel. The eight frequency settings can be incremented or decremented to provide precise frequency
readings, removing any guesswork w hen changing frequency settings to eliminate cros stalk. NOTE: Adjacent
loops connected to different channels of a non-sc anning detector or different scanning dete ctors should be set to
different frequencies with maximum separation.
The Re no A & E M odel U-1000 Series utilizes the first major innovat ion in inductive loop detectors since the
introduction of digital detecto rs. The programming of all of the detector’s para meters with four normally open
pushbutton switches not o nly simplifies setup by removing binary coded DIP switches, but also increases the
reliability of the detector by eliminating the dependence on switch contacts during normal operation. The detailed
descriptions displayed on the LCD eliminate the interpretation of numerous LED flash rates to determine the
detector status. In addition, the Mode l U-1000 offers the ve rsatility of softwa re control. Spec ial functions are
possible with a simple change of the socket-mounted microprocessor. Special functions are de fined as unique
options (e.g. Option 5, Opt ion 12, etc.). Spe cial option functio ns are activated thro ugh the use of t he LCD menu
option programming.
The Model U-1000 Series is comprised of the following detectors:
U-1100-R For retrofit applications ca lling for a four channel, shelf mount detecto r with
relay outputs and an audible detect signal (buzzer) conforming to the
specifications set forth in paragraph 86-5.01A (3b) of the Caltrans Standard
Specifications.
889-2103-01 Model U-1000 Operations Manual Page 1 of 26
U-1100-SS For retrofit applications ca lling for a four channel, shelf mount detecto r with
U-1200-R For NEMA TS 1-1989 applications calling for a four channel, shelf mount
U-1200-SS For NEMA TS 1-1989 applications calling for a four channel, shelf mount
solid state outputs and an audible detect signal (buzzer) conforming to the
specifications set forth in paragraph 86-5.01A (3b) of the Caltrans Standard
Specifications.
detector with relay outputs and an audible detect signal (buzzer).
detector with solid state outputs and an audible detect signal (buzzer).
889-2103-01 Model U-1000 Operations Manual Page 2 of 26
Section 2 General Characteristics
2.1 LOOP FREQUENCY
There are eight (8) selectable loop frequency settings (nor mally in the range of 20 to 100 kilohertz) per c hannel.
The actual loop operating frequency is a function of the loop / lead-in network and the components of the loop
oscillator circuit. The d igital display of the actual loop operating frequency for each setting makes it easy to
quickly identify and eliminate crossta lk in the most difficult to configure intersections. The frequency display is
typica lly very stab le when the loop is vacant and veh icles are not passing nearby the loops. If the reading is
varyin g by more than ±1 in the last digit, this is an indication of possible crossta lk betwee n loops.
2.2 SENSITIVITY
There are nine (9) selectable sensitivity levels per channel, plus Continuous-Call and Cha nne l-O f f. T he s ensitiv i t y
levels are designed so that a one level increase actually doubles the sensitivity and a one level decrease halves the
sensitivity. A unique bargraph d isplayed on t he LCD makes it eas y to quickly set sensitivity at t he ideal leve l for
any loop / lead-in network configuration. (See Section 3.4 fo r actual detection levels at each sensitivity level.)
C
ONTINUOUS-CALL: Whe n se t t o t he Co nt in uo us -Call state , the c hannel ou tput is co ntinuous ly in t he Call state
regardless of t he presence or absence of vehicles o ver the loop. The loop oscillator is d isabled when in the
Continuous-Call state. T his state is indicated b y CALL flashing on the LCD. This option is selected from the
Sensitivity menu in Program Mode and is useful for checking co ntroller response and other troubleshooting
activities.
C
HANNEL-OFF: When s et to the Channel-O ff state, the channel output is cont inuously in the No Call state
regardless of the presence or absence of vehicles over the loop. The loop oscillator is disabled when in the
Channel-Off State. This sta te is indicated by OFF flashing on t he LCD. This option is selected from the
Sensitivity menu in Program Mode and is useful for checking co ntroller response and other troubleshooting
activities.
2.3 PRESENCE / PULSE
One of two mutually exclusive modes of operation for each channel is available. Presence or Pulse mode is
toggled by momentarily pressing e ither the (UP) or (DOWN) button.
P
RESENCE MODE: Provides a call hold time of at least four min utes (regardless of vehicle size) and typically one
to three hours for an automobile or truck.
P
ULSE MODE: An output Pulse of 125 ±10 milliseconds duration is generated for each vehicle entering the loop
detection zone. Each detected vehicle is instantly tuned out if it remains in the loop detection zone longer than
two seconds. This enables detection of subsequent vehicles entering the loop detection zone. After each vehicle
leaves the loop detection zone, the channel resumes full sensitivity within 0.5 seconds.
2.4 CALL DELAY
Each channel’s Call Delay is ad justab le from 0 t o 255 seconds in one-second steps. Call Delay time starts counting
down when a vehicle enters the loop detection zo ne. The remaining Ca ll Delay time i s continuous ly displayed on
the LCD . W he ne ver a Pha se Gr ee n I npu t ( Ca ll D e la y Ove r rid e ) s ig nal ( p in 1 , 2 , 3 , o r 4 o f t he 4-pin connector) is
active, the Call Delay function for the channel is aborted and the Call Delay time is forced to zero.
2.5 CALL EXTENSION
Each c hannel’ s Call Ext ension is adjustable from 0 to 25.5 seconds in 0.1-second steps . Extension time starts
counting down when the last vehicle clears the loop detection zone. The remaining Call Extension time is
contin uous ly d isp la yed o n the LCD. Any veh icle ente r ing t he lo op de tec tio n zo ne d uri ng t he Ca ll E xtens io n ti me
period causes the channel to return to the Detect state, and later, when the last vehicle clears the loop detection
zone, the full Call Exte nsion time starts counting down again. (See Option 3, Call Extension Control, for an
alternate mode of operation for Call Extension.)
2.6 MAX PRESENCE TIMER
When activated, each channel’s Max Presence timer is adjustable from 1 to 999 seconds in one-second steps. A
setting of OFF turns the Max Presence timer off. The Max Presence function is used to limit prese nce time, by
automatically resetting the channel. If this function is enabled (ON), the Max Pre sence timer begins counting
down when a call is initiated and t he remaining ti me is continuously displaye d on the LCD. If t he loop becomes
vacant before the Max Presence timer reaches zero, the call is dropped and no automatic reset occurs. If the EndOf-Green (EOG) function is not enabled (OFF) and the call is still present when the Max Presence timer reaches
zero, the cha nnel then is aut omatically reset. If the EOG function is enabled (ON) and the call is s till present when
the Max Presence timer reaches zero, the channel enters a Wait state. The Wait state continues until either the loop
becomes vacant or the Phase Green Input signal for a channel (pin 1, 2, 3, or 4 of the 4-pin con nec tor ) tra ns itio ns
from green to not green with t he call still present. If the loop be comes vacant first, the call is dro pped and no
889-2103-01 Model U-1000 Operations Manual Page 3 of 26
automatic reset occurs. If the Phase Green Input transitions from green to not green while a channel is in a Wait
state, the channel is automatically reset. The signals on pins 1, 2, 3, and 4 of the 4-pin connector are also called
Call Delay Overrides. (See Section 3.2, Phase Green Input specification for voltage levels.)
2.7 END-OF-GREEN (EOG)
Each channel’s EOG setting can be toggled O N or OFF b y moment arily pr essing either the (UP) or (DOWN)
button. The EOG function is used to synchronize resetting of a detector with the termination of the associated
phase green. The assumption is that this is t he safest point in t ime to reset t he channel. T his assumpt ion is based
on the premise that at the termination of the associated phase green, traffic should be moving, and therefore, a reset
would not result in the loss of a call w hen traffic comes to rest over the loop(s). The EOG function is only
available when the Max Presence function is set between 1 and 999 seconds. It is not available when the Max
Prese nce fun ct io n is O FF. W he n t he E OG func t io n is ena b led (ON ), t he channel will automatica lly be reset at the
same time the Phase Green Input s ignal (pin 1, 2, 3, o r 4 of the 4-p in connector) transitions from the ON state to
the OFF state, if the Max Presence Time has counted down to zero and is resting in the wait state. The s ig nals o n
pins 1, 2, 3, and 4 of the 4-pin connector are also called Call Delay Overrides. (See Section 3.2, Phase Green Input
specifications for voltage levels.)
2.8 OPTION 1: LOOP INDUCTANCE DISPLAY
Each channel’s Loop Inductance Display setting can be toggled ON or OFF by momentarily pressing either the
(UP) or (DO W N ) b u t to n. W hen this option is e na b le d (ON), t he LCD d is p lays the to t al lo o p i nd uc t a nc e (a c t ua l
loop inductance plus actual lead-in inductanc e) in micro henrie s for loop in ductanc e values in the ra nge of 20 to
2500 microhenries. By recording the inductance of the loop / lead-in circuit when it is first insta lled, the actual
inductance can be compared to the expected inductance to help identify defective loop / lead-in circuits. Loop /
lead-in inductance can be easily estimated using the simple formulas included in Section 8.7 of this manual.
NOTE: Enabling this option act ivates it for all c hannels. This option is auto matically disabled 15 minutes after
activation or on loss of power.
2.9 OPTION 2: LOOP INDUCTANCE -∆L/L DISPLAY
Each cha n ne l’s Loo p I nd uct a nce -∆L/L Display sett ing can be toggled ON or OFF by momentarily press ing either
the (U P) or (DOWN ) button. Wh en this option is enab led (ON), the LCD dis plays the pe rcentage of
inductanc e change ( -∆L/L value) during the Call state. To facilitate t he viewing of the maximum amount of
change in the -∆L/L value while traffic is in motion over the detection zone, the channel holds the peak -∆L/L
value for a period of two seconds. NOT E: Enabling this option activates it for all channels. This option is
automatically disabled 15 minutes after activation or on loss of power.
2.10 OPTION 3: CALL EXTENSION CONTROL
Each cha nnel’ s Cal l Exte nsion C ontro l set ting ca n be to ggled O N or OF F by mo mentar ily pre ssin g eithe r the
(UP) or (DO WN ) b ut to n. W he n t h is o pt io n is e nab led (O N) , t he c ha n nel w ill e x tend ca l ls f or t he pr o gra mme d
extens ion ti me only when t he P hase Gr ee n Inp ut s ign al ( pi n 1, 2 , 3, or 4 of the 4 -pin connector ) is active. When
this o pt ion is OF F, t he channe l extends A L L c alls for t he p r o grammed e xt e nsion t ime . The si g na ls o n pins 1, 2 , 3,
and 4 of the 4-pin connector are also called Call Delay Overrides. (See Section 3.2, Phase Green Input
specifications for voltage levels.)
2.11 OPTION 4: NOISE FILTER DISABLE
The detector’s Noise Filter Disable setting can be toggled ON or OFF by momentarily pressing either the (UP)
or ( DO WN ) b utt o n. W he n Op t io n 4 is e nab le d ( ON ), inte r na l no is e f ilt er in g is d isa ble d t hus p ro vid in g a fas te r
response time. When this option is O FF, internal noise filtering is utilized. W hen the detector is used in speed
and/or occ upa ncy a pp lica tio ns, the noise filter should be disabled (i.e. Option 4 ON ) to provide the most acc urate
data possible. It is recommended t hat this option not be activated. The factory default setting o f OFF provides
stable operation in high crosstalk environments. NOTE: Enabling this option activates it for all channels.
Changing the setting of this feature will reset all detector channels.
The Loop Fail Count is not reset when the setting of Option 4 is changed. Also, changing the setting of Option 4
will not cause the prior Loop Fail indication to cease (see Section 5.3, Loop Fail Indications).
2.12 OPTION 5: PHASE GREEN LOOP COMPENSATION
Each channel’s Phase Green Loop Co mpensation setting can be toggled ON or OFF by mo mentarily pressing
either the (UP) o r (DOWN) button. W hen Option 5 is enabled (ON), normal loop compensation is used until
the Phase Green Input signal (p in 1, 2, 3, or 4 of the 4-pin connector) becomes active. Once the Phase Green Input
signal is active, the channel desensitizes the loop. Maximum desensitization is 0.05% (-∆L/L). This
desensitization tunes out small changes, such as adjacent lane pickup, therefore minimizing the chance of max
timing an empty lane. Note: A small motorcycle may also be tuned out in a short period of time follow ing the
start of Phase Green. This option is useful in minimizing false detectio n resulting from adjace nt lane pickup when
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