RAE E/2 User Manual
E/2 - 1500
Four Channel Rack Mount Detector
®
Designed with fast response times
for use in speed and occupancy
applications
Low power - LEDs and LCD
backlighting are extinguished during
normal operation
Pushbutton programming ensures long
term reliability by eliminating switch
contacts
All programmed detector parameters
are stored in non-volitile memory
Audible detect (buzzer) helps in
verifying vehicles passing over loop(s)
Back-lit LCD screen displays complete
detector status and function settings:
• Eliminates guess work and provides
critical information necessary for
proper detector setup
• Provides direct visual feedback of
channel frequency and sensitivity
settings
• Built-in detector diagnostic features
The E/2-1500 detector is a four channel card rack loop detector with an easy to read LCD screen and individual
channel detect and loop fail indications provided via four high intensity red LEDs. All detector settings and
parameters are programmed using four pushbutton switches and the LCD screen. The E/2-1500 offers advanced
features providing built-in diagnostic capabilities viewable on the LCD screen. These include: 1.) loop frequency,
2.) loop inductance, 3.) loop inductance change (-∆L/L%), 4.) a bargraph indication of relative inductance change,
5.) accumulated number of loop failures.
3510 E. ATLANTA AVENUE, PHOENIX AZ 85040 +1.480.968.6407 EDITRAFFIC.COM
E/2 - 1500 Specications
This is a Performance Specication. It is not intended to be used as Operating Instructions.
General Characteristics:
Loop Frequency: The LCD screen displays the actual loop operating frequency for each channel, which makes
it easy to quickly identify and eliminate crosstalk. Eight (8) selectable loop frequency settings per channel
(normally in the range of 20 to 100 kilohertz). The actual loop operating frequency is a function of the loop / leadin network and the components of the loop oscillator circuit.
Sensitivity: A unique bar graph displayed on the LCD makes it easy to quickly set the ideal sensitivity for any
loop / lead-in network situation. Nine (9) selectable sensitivity levels per channel, plus settings for ContinuousCall and Channel-Off. The selected sensitivity level establishes the threshold at which the detector provides a
vehicle detect
output signal. [The threshold is dened as -∆L/L(%)]. (See Sensitivity, -∆L/L, & Response Time table.)
Continuous-Call: When set to the Continuous-Call state, the channel output is continuously in the Call
state regardless of the presence or absence of vehicles over the loop. The loop oscillator is disabled when
in the Continuous-Call state. This state is indicated by CALL ashing on the LCD. This option is selected
from the Sensitivity menu in Program Mode and is useful for checking controller response and other
troubleshooting activities.
Channel-Off: When set to the Channel-Off state, the channel output is continuously 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 state is indicated by OFF ashing on the LCD. This option is selected
from the Sensitivity menu in Program Mode and is useful for checking controller response and other
troubleshooting activities.
Call Delay: Each channel’s Call Delay is adjustable from 0 to 255 seconds in one-second steps. Call Delay time
begins when a vehicle enters the loop detection zone. The remaining Call Delay time is continuously displayed
on the LCD. The channel LED ashes at a 4 Hz rate during delay timing.
Call Extension: Each channel’s Call Extension is adjustable from 0 to 25.5 seconds in 0.1-second steps.
Extension time begins when the last vehicle clears the loop detection zone. Any vehicle entering the loop
detection zone during the Extension time returns the channel to the Detect state, and later, when the last vehicle
clears the loop detection zone, the full Extension time starts counting down again. The remaining Extension
time is continuously displayed on the LCD. The channel LED ashes at a 16 Hz rate during extension timing.
Presence / Pulse: One of two mutually exclusive modes of operation for each channel can be selected in
Program Mode:
Presence Mode: Provides a minimum Call hold time of at least four (4) minutes (regardless of vehicle size)
and typically one to three hours for an automobile or truck.
Pulse Mode: A single 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 (2) 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.
Max Presence Timer: Each channel’s Max Presence timer is adjustable from 1 to 999 seconds in one-second
steps, plus OFF. The Max Presence function is used to limit presence time by automatically resetting a channel.
If this function is enabled (On), the Max Presence timer begins counting down when a Call is initiated and the
remaining time is continuously displayed on the LCD. If the loop becomes vacant before the Max Presence timer
reaches zero, the Call is dropped and no automatic reset occurs.
Option 1, Loop Inductance Display: When this option is enabled (On), the LCD screen displays the total
loop inductance (actual loop inductance plus lead-in inductance) in microhenries for loop inductance values
in the range of 20 to 2500 microhenries. NOTE: Enabling this option activates it for all channels. This option is
automatically disabled
ve (5) minutes after the last switch activation or on loss of power.
Option 2, Loop Inductance -∆L/L Display: When this option is enabled (On), the LCD screen displays the
percentage of inductance change (-∆L/L value) during the Call state. To facilitate viewing of the maximum change
in the -∆L/L value while trafc is in motion over the detection zone, the detector holds the peak -∆L/L value for
a period of two (2) seconds. NOTE: Enabling this option activates it for all channels. This option is automatically
disabled ve (5) minutes after the last switch activation or on loss of power.
Option 11, Audible Detect Signal: When this option is enabled (On), an audible signal will be activated
whenever vehicles are in the detection zone. The audible signal indicates occupancy of the loop detection zone.
Timing functions have no affect on the audible signal. This feature allows a technician to watch the detection
zone to conrm correct detector operation without having to look at the detector display. Only one channel can
have this feature active at a given time. Turning this option on for one channel automatically turns it off for all
other channels. NOTE: This option is automatically disabled ve (5) minutes after activation or on loss of power.
Specications (Physical):
Weight: 7.0 oz (199 gm.).
Size: 4.50 inches (11.43 cm.) high x 1.12 inches (2.84 cm.) wide x 6.875 inches (17.46 cm.) deep (including
connector, excluding handle). Handle adds 1.00 inch (2.54 cm.) to depth measurement.
Operating Temperature: -40º F to +180º F (-40º C to +82º C).
Circuit Board: Printed circuit boards are 0.062 inch thick FR4 material with 2 oz. copper on both sides and plated
through holes. Circuit boards and components are conformal coated with polyurethane.
Connector: 2 x 22 contact edge card connector with 0.156 inch (0.396 cm.) contact centers. Key slots located
between pins B/2 & C/3, E/5 & F/6, and M/11 & N/12. (See Pin Assignments table.)
Specications (Electrical):
Power: 10.8 to 14 VDC, 100 mA maximum, 40 mA during normal operation.
Loop Inductance Range: 20 to 2500 microhenries.
Loop Feeder Length: Up to 5000 feet (1500 m) maximum with proper feeder cable and appropriate loops.
Loop Inputs: Transformer isolated. The minimum capacitance aded by the detector is 0.068 microfrarad.
Reset: Application of a 30 millisecond low state (0 to 3 VDC) to pin C resets all channels. The detector can also
be reset by removing and reapplying power. Each detector channel can be independently reset by pressing
the CHAN pushbutton until the desired channel is selected, then holding the CHAN pushbutton for three (3 )
seconds. Also, changing either the sensitivity or loop frequency of a channel will reset that channel. NOTE:
Resetting a channel does not disable any selectable diagnostic functions. If diagnostic options (Option 1, Option
2, or Option 11) have been activated, they will remain activated following the channel reset. Resetting the
detector by applying a 30 millisecond low state to pin C or removing and reapplying power disables all selectable
diagnostic features.
Solid State Outputs: Field effect transistors (FETs). 30 VDC maximum drain to souce. 50mA maximum current.
0.1 VDC maximum transistor saturation voltage. The output transistors are protected by 33 volt Zener diodes
connected between the drain to souce.
Specications (Operational):
Display: The LCD backlighting illuminates whenever any pushbutton is pressed. If one or more channel is in
a Call state, the corresponding LED(s) will also illuminate. The backlighting and LEDs will extinguish ve (5)
minutes after the last actuation of any pushbutton.
Detect Indicators: Each channel has a high-intensity red light-emitting-diode (LED) to indicate a Call output,
Delay Timing, Extension Tiiming, or failed loop.
Response Time: See Sensitivity, -∆L/L, & Response Time table for actual response times.
Self-Tuning: The detector automatically tunes and is operational within two (2) seconds after application of
power or after being reset. Full sensitivity and hold time require 30 seconds of operation.
Environmental & Tracking: The detector is fully self-compensating for environmental changes and loop drift
over the full temperature range and the entire loop inductance range.
Grounded Loop Operation: The loop isolation transformer allows operation with poor quality loops, which
may include a single point short to ground.
Loop (Fail) Monitor: If the total inductance of the channel’s loop input network goes out of the range
specied for the detector, or rapidly changes by more than ±25%, the channel will immediately enter the
Fail-Safe mode and display
LOOP FAIL: on the LCD screen. The type of loop failure will also be displayed as L lo (for -25% change or
shorted loop conditions) or L hi (for +25% change or open loop conditions). This will continue as long as
the loop fault exists.
However, if the detector is reset, or power is momentarily lost, the detector will retune if the loop inductance
is within the acceptable range. If any type of loop failure occurs in one (or more) loop(s) in a group of two or
more loops wired in parallel, the detector will not respond with a fail-safe output following any type of reset.
It is essential that multiple loops wired to a common detector channel always be wired in series to ensure
failsafe operation under all circumstances. The Fail-Safe mode generates a continuous call in both Presence
Mode and Pulse Mode. At the time of a loop failure, the channel’s LED will begin repeating a burst of three
ashes each one second. The LED will continue these bursts until the channel is manually reset or power
is removed. If the loop self
heals, the LOOP FAIL message on the LCD will extinguish and the channel will resume operation in a normal
manner; except the LED will continue the bursts thus providing an alert that a Loop Fail condition occurred.
Each loop failure for the channel is counted and accumulated into the Loop Fail Memory. The total number of
loop failures written into the Loop Fail Memory (since the last power interruption or manual reset) is viewed
by stepping through the channel’s functions in Program Mode to the LOOP FAIL message.
Full Restore To Factory Defaults: Pressing all four front panel switches simultaneously and continuously for
ve (5) seconds resets the detector and restores all the factory default settings. The countdown of the ve
second period is displayed on the LCD screen. Releasing any of the switches before the countdown ends
will abort the Full Restore operation. (See Factory Default Settings table.)
Display Test: Pressing any two of the front panel switches simultaneously will display all symbols and
messages on the LCD screen.
Sensitivity -∆L/L Response Time
OFF --- ---
1 0.64% 35 ±7 milliseconds
2 0.32% 35 ±7 milliseconds
3 0.16% 35 ±7 milliseconds
4 0.08% 35 ±7 milliseconds
5 0.04% 35 ±7 milliseconds
6* 0.02% 48 ±10 milliseconds
7 0.01% 79 ±17 milliseconds
8 0.005% 138 ±28 milliseconds
9 0.0025% 261 ±51 milliseconds
CALL --- ---
Function Ch.1 Ch. 2 Ch. 3 Ch. 4
Frequency 2 4 6 8
Sensitivity 4 4 4 4
Delay Time 0 0 0 0
Extension Time 0 0 0 0
Max Presence Time OFF OFF OFF OFF
Presence/Pulse Mode Pres. Pres. Pres. Pres.
End-of-Green (EOG) OFF OFF OFF OFF
Option 1 - Loop Inductance Display OFF OFF OFF OFF
Option 2 - Loop Inductance -∆L/L Display OFF OFF OFF OFF
Option 11 - Audible Detect Signal OFF OFF OFF OFF
PIN Function PIN Function
A DC (-) Common 1 No Connection
B DC (+) Power 2 No Connection
C Reset Input 3 No Connection
D Channel 1 Loop Input 4 Channel 1 Loop Input
E Channel 1 Loop Input 5 Channel 1 Loop Input
F Channel 1 Output, Drain 6 No Connection
H No Connection 7 No Connection
J Channel 2 Loop Input 8 Channel 2 Loop Input
K Channel 2 Loop Input 9 Channel 2 Loop Input
L Chassis Ground 10 No Connection
M No Connection 11 No Connection
N No Connection 12 No Connection
P Channel 3 Loop Input 13 Channel 3 Loop Input
C Channel 3 Loop Input 14 Channel 3 Loop Input
S Channel 3 Output, Drain 15 No Connection
T No Connection 16 No Connection
U Channel 4 Loop Input 17 Channel 4 Loop Input
V Channel 4 Loop Input 18 Channel 4 Loop Input
W Channel 2 Output, Drain 19 No Connection
X No Connection 20 No Connection
Y Channel 4 Output, Drain 21 No Connection
Z No Connection 22 No Connection
Sensitivity, -∆L/L, & Response Time
Factory Default Settings
PIN Assignments
E/2 - 1500 (551-0512-00) 03/23/2020
© COPYRIGHT 2020. Eberle Design, Inc. All Rights Reserved.
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