This product manual was wr itten for people installing, operating, a nd maintaining the R eno A&E Model
E-1400 Series inductive loop vehicle detector. The Model E-1400 is a rack mount, four-chan ne l i nductive
loop vehicle detector designed to work in conjunction with Railroad Control Limited’s Exit Gate
Management System (EGMS).
The Model E-1400 monitors and process es signals from four loop / lead-in circuits, fo ur check loop
circuits, and four Vita l inputs. These inputs can be programmed to control eight Vital outputs, fo ur
primary Vital outputs and four auxiliar y Vital outputs. Each of the four primary Vital outputs can be
controlled by any co mbinat ion of t he four loop inputs and/or a ny co mbination of t he four V ital inputs . In
addition to the four loop inputs and four Vital inputs (as descr ibed above), the four auxiliary Vita l outputs
can be controlled by the four loop Health Status inputs that are co ntinuously monitored by the p rocessor.
A loop failure will deactivate t he Vital out put that the loop status inp ut and/or loop Health Status input is
programmed to control. The check loop circuits can be programmed to simulate a vehicle detection
(every 1 to 255 minutes) in the loop area as a means of verifying proper loop operation. The Vital outp uts
and Vital inputs are monitored to ensure they are in the correct state. If the state of a Vital input is not
correct, the front panel LED indicato r correspond ing to that input will t urn red and a ll Vital o utputs will
be deactivated. If the state of any Vital output is not correct, the front panel LED corresponding to that
output will turn red and all Vital outputs will be dea ctivated.
A Liquid Crystal Display (LCD), s ixteen L EDs, and fo ur front panel p ushbuttons are used to displa y and
program all detector functions. T he Model E-1400 also incorporates a fro nt mounted nine pin RS-232
connector to facilitate set-up and operation.
The use of a LCD is one feature that distinguishes this detector from that of other manufacturers. It
allows for more information, never before available, to be displayed to the user dur ing normal operation
of the detector. Several diagnostic modes are available to aid the technician in troubleshooting detection
problems. It also allows easy viewing and setting of all programmab le va lues in the detector. The
detector continues to operate normally while being programmed. An eight-seg ment bargraph at the top of
the LCD provides a graphical representation o f the relative change of inductance as seen by the detector.
This automatically takes into account loop size, loop inductance, number of loops, number of turns,
geometry, lead-in length, etc. The first bargraph segment represents the minimum inductance change
necessary for the detector to output a call. Larger inductance changes will be indicated by more segments.
Each additional segment represents the next sensitivity level exceeded. Therefore, the bargraph indicates
if the sensitivity is set too high or too low, e as ily fac ilita ting the ideal sett i ng of sensitivity level.
All programmed settings a re stored in non-volatile memory and ca n only be changed by programming
new settings. Memory storage consists of an internal EEPROM and an external EEPROM memory
module. Settings programmed on either component must match t hose p rogra mmed on the o ther f or the
detector to operate. Loss of power or a detector reset will not change the programmed settings. If a loop
failure occurs, the LCD w ill display the type of loop failure as L lo (for -25% change or shorted loop
conditions) or L hi (for +25% change or open loop conditions). Each loop failure is counted (up to a
maximum of 255 failures) and accumulated in t he Loop Failure Me mory. Information on the nu mber of
failures since the last detecto r reset or power interruption is very useful during analysis of proble ms d ue to
intermittent loop operation.
The Model E-1400 detector is a scanning detector. The scanning ope ration sequentially activates the ON
and OFF cycle of each detector channel’s oscillator. Because only one channel’s input loop(s) is (are)
active at a given time, crosstalk between adjacent loops connected to the same scanning detector is
minimized. Several Mo d e l E-1400 detectors can be linked together via t he Synch In and Synch Out lines.
This allows loops connected to different d etectors to be scanned in series or pa rallel. When in Program
Mode, the Model E-1400 detector displays the real time loop freque ncy read ing for each cha nnel. T he
eight frequency levels can be inc remented or decremented to provide prec ise frequency settings. This
removes the guesswork when changing frequency sett ings to e liminate crossta lk. NO TE: Adjacent loops
connected to different channels of a non-scanning detector or different scanning detectors should be set to
diffe rent fre quencies with the maximum separation possible.
The Reno A&E Model E-1400 uses the first major innovation in inductive loop detectors since the
introduction of digital detecto rs. The progra mming of all o f the detector’s parameters with fo ur normally
open pushbutton switches not only simplifies setup by re moving b inary coded rotary or DI P s witches , b ut
also increases the reliability of the detect or by removing the dependence on switch contac ts during normal
operation. The detailed descriptions displayed on the LCD eliminate the interpretation of numerous LED
flash rates to determine the detector status.
There are eight selectable loop frequency settings (normally in the range of 20 to 100 kilo hertz) per
loop input. The actual loop operating frequency is a function of the loop / lead-in network and t he
components of the loop oscillator circuit. The digital display of the actual loop opera ting frequenc y for
each setting makes it easy to qu ickly identify a nd eliminate crossta lk in the most diff icult to configure
instal latio ns. The freq uenc y disp lay is typically very stable when the loop is vacant and vehicles are
not passing close to the loops. If the reading is varying by more than ±1 in the last digit, this is an
indication of possible crosstalk between loops.
2.2 Sensitivity
There are ten selectable sensitivity levels pe r loop input, plus Continuous-Call and Loop-Off. The
sensitivity levels are designed so that a one level increase actually doubles the sensitivity and a one
level decrease halves the sensitivity. A unique bargraph displayed on the LCD make s it easy to quickly
set sensitivity at the ideal level for any lo op / lead-in network situation. (See Section 3.4 for actual
detection levels at each sensitivity level.)
C
ONTINUOUS-CALL: W hen se t to the Cont inuo us-Call state, the Lo op Sta tus is conti nuo usly in t he
Call state regardless of the presence or absence of vehicles over the loop. If the Loop Status Input is
assigned to a Vital Output, the Cont inuous-Call state will deactivate the Vital Output. The loop
oscillator is disab led w he n in t he Co nt inuo us-Ca ll State. This sta te is indicated b y Call flashing on
the LCD. This option can be selected from the Sensitivity menu in Program Mode and is useful for
checking controller response and other troubleshooting activities.
L
OOP-OFF: When set to the Loop-Off state, the Loop Status is continuously in the No-Call state
regardless of the presence or absence of vehicles over the loop. If the Loop Status Input is assigned
to a Vital Output, t he Loop -O ff state w ill not a ffec t the Vita l O ut put. T he lo op osc il la t o r is disabled
when in t he Loo p -O ff S tate . This state is indicated by OFF flashing o n the LCD. This option can be
selected from the Sensitivity menu in Program Mode and is useful for checking controller response
and other troubleshooting activit ies.
2.3 Option 1, Loop Inductance Display
The Loop Inductance Display sett ing can be toggled ON or OFF b y momentarily pressing either the
(UP) or (DOWN ) pus hbu tton. Whe n th is opt ion is ena bled (ON), the LCD displays the total loop
inductance (actual loop inductance plus actual lead-in inducta nce) in micr ohenr ies f or loo p ind ucta nce
values in the range of 20 to 2500 microhenries. By recording the inductance of the loop / lead-in circuit
when it is first installed, 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 8.2 of this manual.
NOTE: Enabling this option activates it for all loop inputs. This option is automatically disabled 15
minutes after activation or on loss of power.
2.4 Option 2, Loop Ind uc t a nc e -Δ L/L Display
The Loop Inductance -ΔL/L Display setting can be toggled ON or OFF b y momentarily pressing eithe r
the (UP) or (DOWN) p ushbutto n. When this option is enabled (ON), the LCD disp lays the
percentage of inductance change (-ΔL/L value) during the Call state. To facilitate the viewing of the
maximum amount of change in the -ΔL/L value while traffic is in motion over the detection zone, the
channel holds the peak -ΔL/L value for a period of two seconds.
NOTE: Enabling this option activates it for all loop inputs. This option is auto matically disabled 15
minutes after activation or on loss of power.
2.5 Option 3, Noise Filter
Each loop input’s Option 3 has four settings ranging from 3.00 to 3.03. When Option 3 is set to 3.00,
the opt io n is dis ab le d ( OFF), and normal noise filter ing is used. W hen Opt ion 3 is set to 3.01, 3. 02, or
3.03 the option is ON, and increased filtering of the loop signal is used to eliminate problems
associated with particular types of noise. Turning this option ON when not required can degrade the
performance of the detector. The default setting of this option is 3.00 (OFF). This option should only
Each loop input’s O pt io n 4 has nine settings ranging from 4.00 to 4.08. This option allows the user to
select a detection zone tracking setting that will maintain detection zone occupancy for an extended
period of time. When Option 4 is set to 4.00, the detector will track out the vehicle (i.e. drop the
detection of the vehicle) in four minutes to several hours depending on the amount of inductance
change (-ΔL/L) caused by the vehicle when it is detected. The greater the change caused by the
vehicle, the longer the time needed to track out the vehicle. When Option 4 is set to 4.01, 4.02, 4.03,
4.04, 4.05, 4.06, 4.07, or 4. 08 the option is ON, and the detector will provide extended detection times.
The default setting of Option 4 is 4.02.
There are many factors that influence t he proper setting of this option. A full explanation of how to
determine the correct setting is beyond the scope of this manual. Contact Technical Support at Re no A
& E regarding proper setting of this option.
NOTE: Using this option in a long loop application is not reco mmended. The detector will drop t he
call prior to the vehicle totally exitin g the loop.
4.00 = Tracking Rate 0.
4.01 = Tracking Rate 1.
4.02 = Tracking Rate 2.
4.03 = Tracking Rate 3.
4.04 = Tracking Rate 4.
4.05 = Tracking Rate 5.
4.06 = Tracking Rate 6.
4.07 = Tracking Rate 7.
4.08 = Tracking Rate 8.
2.7 Option 5, Sensitivity Boost
Each loop input’s Option 5 has five settings ranging from 5.00 to 5.04. When Optio n 5 is set to 5.00,
the opt ion is dis abled (OFF), and no sensitivity boost is added. When Option 5 is set to 5.01, 5. 02,
5.03, or 5.04 the option is ON, and sensitivity boost is enabled. After detection, the sensitivity is
boosted to the currently selected sensitivity level plus the number of leve l(s) selec ted . The max imum
sensitivity level which can be obtained with or without sensitivity boost is level 10.
5.00 = Off.
5.01 = 1 level.
5.02 = 2 levels.
5.03 = 3 levels.
5.04 = 4 levels.
2.8 Option 6, Audible Detect Signal
Each loop input’s Audible Detect Signal setting can be toggled ON or OFF by momentarily pressing
either the (UP) or (DOWN) button. Only one loop inp ut can be turned ON at a time. Turning
this option ON for one loop input automatically turns it OFF for the other loop inputs. When th is
option is enabled (ON), an audible signa l will be activated whenever the detection zone for the selected
loop input is occupied. The a udible s ignal indicates act ual occ upancy of t he loop de tection zo ne. This
feature allows a technician to watch the detection zone and confirm correct detector operation without
having to look at the detector display as well. NOT E : This opt ion is automatically disabled 15 minutes
after activation or on loss of power.
2.9 Loop Check
The Loop Check feature provides a means of automatically verifying the proper operatio n of eac h loop
circuit. The Loop Check Timer ca n be set for a n inter val ranging from 0 to 255 minutes in o ne-minute
increments. A setting of 000 indicates that the Loop Check feature is off.
This feature is used in conj unction with the Synch feature (Opt ion 7) and is also use d as a means of
providing each detector with a unique identification signature fo r communication purposes. Detector
ID settings ca n range from 000 to 255. If, however, the detector is set to an ID value of 255, it is
considered to be in an uninitialized state a nd the de tector will not save any powe r down data. W hen a
detector with an ID setting of 255 is powered up, t he LCD will alternate between id and 255 until the
ID setting is changed to something other than 255 and the new setting is saved in detector memory.
When any detector is first initialized, its ID setting is, by default, 255.
2.11 Option 7, S ynch Feature
This option provides a means of linking together up to four (4) E-1400 detectors. Each detector’s
Option 7 has three settings ranging from 7.00 to 7.02. There are two modes of Synch, Series Synch and
Parallel Synch. When set to operate in Series Synch mode, one detector channel in the entire detector
system is active at any given time. T his has the advantage of minimizing crosstalk between adjacent
loops connected to different E-1400 detectors. When set to operate in Parallel Synch mode, all
detectors scan t heir respective channel 1, 2, 3, or 4 inputs at the same time. Parallel Synch offers a
faster response time than Series Synch, however the potential for crosstalk is greater.
7.00 = Off.
7.01 = Series Synch.
7.02 = Parallel Synch.
NOTE: When operating in eit her Series or Parallel S ynch mode, a ll linked detect ors must have Op tion
7 set to the same setting.
2.12 Option 8, Inductive Island Circuit Feature
The detector’s Inductive Is land Circuit option can be toggled ON or OFF by momentarily pressing
either the (UP) or (DOWN) pushbutt on. Opt io n 8 is a detecto r wide o ption. Turning t his opt ion ON for one loop input automatically turns it ON for the ot her loop input s. NOTE: Op tion 8 is
mutually exclusive with Option 9. Only one option can be enabled at a given time . If an attempt is
made to turn one option ON while the ot her is enabled, a warning buzze r will sound t o provide a n alert
that the other mutually exclus ive option is ON.
For proper operation, the arming loops must be connected to input channels 1 and 3 and the main
channel loops must be connected to input channels 2 and 4.
The sequence of operation starts with a detection on one of the two arming loops. Once this presence
detection has occurred, the remaining two or three input channels arm and Auxiliary Vital Output 1
deactivates. As the vehicle proceeds from the first ar ming loop onto the main channe l loop(s) and onto
the other arming loop, pres ence detection continues and de activation of Auxiliary Vita l Output 1 is
maintained. Once the vehicle has cleared the second arming loop, presence detection ends and
Auxiliary Vital Output 1 reactivate s .
This feature is used in applications where it is necessary to monitor the presence of vehicles within atgrade crossings. The expected installation is two 2 0-foot arming loops located on either side of the
crossing, and one or two main c ha nnel loops spanning the crossing. Contact a Technical Support
representative at Reno A&E regarding proper loop configurations and spacing for specific applications.
The detector’s Inductive Shunt Enhancement Circuit optio n can be toggled ON or OFF b y momentar ily
pressing either the (U P) or (DOWN) pushbutton. Option 9 is a pa ired input option. T his means
that it takes two inputs to implement the feature. When this option is to ggled ON or OFF for one
input, its paired input is also set to the same sta te. In the Model U-1400, input Channel 1 is paired with
input Channel 2 and input Channel 3 is paired with input Channel 4. NOTE: Opt ion 9 is mutually
exclus i ve w it h Option 8 . O nl y o ne o p t io n c a n be e na b le d a t a g iven time. I f a n a t tempt is ma d e to t ur n
one option ON while the other is e nabled, a warning buzzer will sound to provide an alert that the other
mutua lly exclusive option is ON.
When Op tio n 9 is t urne d ON, a vehicle e ntering the first loop w ill cause that input channel to e nter a
pending state. As the vehicle enters the second loop while still occupying the first loop, the second
input channel will enter the Ca ll state w hile the first input c hannel re mains in the pend ing state . A Cal l
is neve r o ut p ut on the fi rs t i np u t c hannel w it h a d e t ec t ion. Under normal conditio ns it is not pos sible to
have both outputs on at the same time. However, if one of the loops fails, both outputs will come on
and stay on until the failure is corrected.
The sequence of operation starts with a detectio n on one input channel. When both of the paired input
channels have detection, t he last input channel to have dete c tion will output a Call and its Primary Vital
Output(s) (if mapped) a nd Auxiliary V ital Output(s) (if mapped) deac tivate until the detection for the
last input ends, even if the detectio n ends for the fir st input c hannel. Pr imary Vita l Output ti ming
funct io ns ( Primary V it a l Output D e la y o r P r i ma r y V i tal Output E x tension) a r e u na f fe c t e d b y t he s e tting
of this feature. When detection end s for both input channels, the Call o utput will cease and the Primary
Vital Output(s) (if mapped) and A uxilia r y Vital Output(s) (if mapped) will reactivate.
This feature is used in applications where it is necessary to determine t he travel direction of vehicles
operating on a two-way section of railway trackage. The expected installation is two 20-foot long loops
spaced approximately 25 to 28 feet apart. C ontact a Technical Support representative at Reno A&E
regarding proper loop configurations and spacing for specific applications.
Each Primary Vital Output (Vita l Out) c a n be c o nd itioned w it h a Dela y t i me that is adjustable from 0.0
to 25.5 seconds in 0.1-second steps. Primary Vital Output Delay time starts counting down w he n a Call
state is received from a Loop Sta tus Inp ut or V ital Inp ut (Vital In ) that is mapped to the primary Vital
Output (Vital Out). When the timer reaches zero, the primary V ital Output is deactivate d. Primary
Vital Output Delay does not condition the auxiliary Vital Outputs (Vital Aux).
2.15 Primary Vital Output Extension
Each Pr imary Vital O utput ( Vital Out) can be conditioned with an E xtension time that is adjustable
from 0.0 to 25.5 seconds in 0.1-second steps. Pr imary Vital Output Extension ti me starts counting
down when a Call state is cleared from a Loop Status I nput or Vital Input (Vital In) that is mapped to
the primary Vital Outp ut (Vital Out). The primary Vital Output w ill remain OFF until the Exte nsion
time reaches zero. Any vehicle entering the loop detection zone during the Exte ns ion time period
causes the primary Vital Output to remain in the OFF state, and later, when the last vehicle clears the
loop detection zone, the full Primary Vital Output E xt e nsion time sta rt s c o u nt in g d o w n a gain. Primary
Vital Output Extension does not cond ition the auxiliary Vital Outputs (Vital Aux).
2.16 Input / Output Mapping
The Loo p Sta tus I nputs and/o r Vita l Inp uts (Vital In) can be ass igned to one or more of the primary
Vital (Vital Out) and a uxiliary Vital (Vital Aux ) Outputs. Health Status can o nly be mapped to the
auxiliary Vital Outputs (Vital Aux).
2.17 Full Restore To Factory Default Settings
Pressi ng a ll fo ur fro nt pa ne l p us hb utt on sw it che s si mu lta ne o us ly a nd co nt in uo us ly fo r five (5 ) s e co nds
restores all factory default settings. The countdow n o f the five sec ond period is displa yed o n the LCD.
Releasing any or all of the switches before the countdown ends aborts the full restore operation. (See
Section 3.5 for default settings). Refer to Sect ion 5.0 for details. Caution: Restoring the factory default settings will clear all previously programmed settings including any m appe d outpu t(s).
2.18 Diagnostic F eat ur e s Acti vat io n
When the detector is operating in normal mode, pressing either the (UP) or (DOWN ) button will
temporarily activate Option 1 (Loop Inductance Display) and Option 2 (Loop Inductance -ΔL/L
Display) for all loop inputs and Optio n 6 (Audible Detect Signal) for the loop input ind icated in the
lower portion of the LCD. All three of these diagnostic options will remain active for 15 minutes.
2.19 Password Protection
This detector has a password protection feature to gua rd against the accidental change of detector
settings. In order to change any detector setting, a valid password must be e ntered to disable the
password protection feature. Refer to Section 5.0 for details.
IZE: 9.50 inches (24.13 cm) high x 1.50 inches (3.81 cm) wide x 7.75 inches (19.69 cm) deep
including connectors and card ejectors.
O
PERATING TEMPERATURE: -40°F to +180°F (-40°C to +82°C).
C
IRCUIT BOARD: Printed circuit boards a re 0.062 inch thick FR4 material with 2 oz. copper on both
sides and plated through holes.
C
ONNECTORS:
P
RIMARY INTERFACE CONNECTORS (CON1 and CON2): 34Pin, right angle, PC Board mount.
C
OMMUNICATIONS PORT CONNECTOR (CON4): DB-9, nine pin, right angle, PC Board mount, metal
shell, D subminiature receptacle with gold plated female contacts and nuts for retaining screws.
3.2 Electrical
P
OWER: 9.5 to 18 VDC, 3.0 Amps maximum.
F
USE:3 amp, 2AG type (Slo-Blow) type located in a fuse holder mounted on the PC Board.
P
OWER DOWN: When t he DC volt age drop s belo w the low powe r det ectio n t hresho ld (7.9 VDC), t he
detector will save all needed information to hold calls through the power down sequence. Upon power
resto ration (a minim um of 10.2 V DC), the detector will use this saved data to determine the correct
occupancy state of all loops.
L
OOP FEEDER LENGTH: Up to 1500 feet (450 m) maximum with proper feeder cable and appropria te
loops.
L
OOP INDUCTANCE RANGE: 20 to 2500 micro Henries w ith a Q factor of 5 or greater.
L
OOP INPUTS: Transformer isolated. The minimum capacitance added by the detector is 0.068
microFarad.
L
IGHTNING PROTECTION: The detector can tolerate, without damage, a 10 microFarad capacitor charged
to 2,000 volts being discharged directly i nto the loop input terminals, or a 10 microFarad capacitor
charged to 2,000 volts being discharged between either loop terminal and earth ground.
R
ESET: App lication of a 30 millisecond low state (relative to +12 VDC ) to Pin DD o f the lower
primary interface connector (CON2) resets all loops. Each loop input channel ca n be manually reset by
selecting the loop input channel then pressing and holding the front pa nel CHAN button for three
seconds, or by changing the sensitivity or loop frequency of the loop input channel.
S
YNCHRONIZE SCAN CONTROL:The SYNC H IN input and SYNCH OUT outpu t allow the loops from
different detectors to be scanned sequentially, either in series or parallel. This feature can be used to
eliminate crosstalk between adjacent loops connected to different E-1400 detectors. NOTE: Response
times will vary depending on the number of detectors (up to a maximum of four) on the SYNCH Line.
(See Section 3.4.)
V
ITAL OUTPUTS:The primary and auxiliary Vital Outputs are transformer isolated and are capable of
sourcing 200 mA at 12 VDC. Opto-isola ted circuitry verifies t hat the Vital Output is in the desired
state. If any Vital Output fails its self-chec k, all of the detector’s Vital Outputs will be dea ctivated.
V
ITAL INPUTS:12 volt inputs isolated from the detector. Opto -isolated circ uitry verifies that t he Vital
Inputs are operational.
C
HECK LOOP RELAYS:Co ntacts rated for 6.0 Amps maximum, 150 VDC, 300 VAC, and 500 V A
OOP STATUS INDICATORS: Each loop input has a super high intensity red light emitting diode (LED) to
indicate a CALL (vehicle detected over loop) or failed loop.
I
NPUT /OUTPUT INDICATORS: The detector has 12 dual color (green / red) LEDs to indicate the
following:
Vital In LED StatusMeaning
OFF Vital Input is deactivated (low voltage level).
GREEN ON Vital Input is activated (high voltage level).
RED ON Vital Input has failed its self-check (Vital Inputs, Primary Vital
Outputs, and Auxiliary Vital Outputs revert to OFF state).
Vital Out LED StatusMeaning
OFF Primary Vital Output is deactivated (low voltage level).
GREEN ON Primary Vital Output is activated (high voltage level).
GREEN 2Hz FLASHING Timing Delay activated and Primary Vital Output is working (high voltage
GREEN 5Hz FLASHING Timing Extension activated and Primary Vital Output is working (low
RED ON Primary Vital Output has failed its self-check (Vital Inputs, Primary Vital
Vital Aux LED StatusMeaning
OFF Auxiliary Vital Output is deactivated (low voltage level).
GREEN ON Auxiliary Vital Output is activated (high voltage level).
RED ON Auxiliary Vital Output has failed its self-check (Vital Inputs, Primary Vital
level until delay times out).
voltage level until extension times out).
Outputs, and Auxiliary Vital Outputs revert to OFF state).
Outputs, and Auxiliary Vital Outputs revert to OFF state).
RESPONSE TIME: See Section 3.4 for actual response times.
S
ELF-TUNING: Each loop circuit tunes and is operational within two seco nds after app licatio n of power
or after being reset. Full sensitivity and hold time require 30 seconds of operation.
E
NVIRONMENTAL &TRACKING: The detector is fully se lf-compensating for enviro nmental c hanges and
loop drift over the full temperature range and the entire loop inductance range.
G
ROUNDED LOOP OPERATION: The loop isolation transformer allows ope ration with poor qua lity loops
(which may include one short to ground at a single point).
L
OOP (FAIL)MONITOR: If the to ta l in d ucta nc e o f a c ha nne l’ s loop input network goes out of the range
specified for the detector, or rapidly changes by more than ±25%, and the Loop and/or Health status
outputs are mapped, the Loop a nd/or Health status o utputs will immediately enter Fail-Safe mode and
the LCD wil l disp lay LOOP FAI L. 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 o r open loop conditions). This will
continue as long as the loop fault exists. At t he time of a loop failure, the Loop stat us LED will begin
to flash at a rate of three flashes per second. The LED will continue this display pattern until the loop
input channel is manually reset or power is removed. If the loop self-hea ls, t he LO OP FAIL message
on the LCD will extinguish and the loop input cha nnel will resume operation in a normal manner;
except the Loop status LED will continue the three flashes per second display pattern, thus providing an
alert that a prior Loop Fail condition has occurred. Eac h loop failure for the loop input cha nnel is
counted and accumulated into the Loop Fail Memory. The total number of loop failures written into t he
Loop Fail Memory (since the last powe r interruption or manual reset) ca n be seen by stepping through
the loop input channel’s detector functions in Program Mode to t he LOOP F AIL mes sage . W hen t he
status of one or more loops is ass igned to a Vita l Outp ut, a loop failu re will de act ivate the Vita l Outp ut
and the c orrespo nding Vital Out LED will turn from green to OFF to indicate the failure. Whe n a
Health Status is assigned to a n auxiliary Vital O utput, a loop failure will deact ivate the auxiliar y Vital
Output and the corresponding Vital Aux LE D will turn off.
L
OOP CHECK: This feature is used as a means of verifying proper operation of each inductive loop
connected to a detector. In a typical installation, a separate loop of wire called a check loop will be
wound around the perimeter of each inductive loop. T he Loop C heck T imer can be programmed with a
value ranging from 1 to 255 minutes. Once this time interval has elapsed, the detector will
automatically short the check loop simulating vehicle detection in the inductive loop. If this initial loop
check test fails, the detector will enter a verification mode to make certain that the loop failure is indeed
due to a loop related problem. While operating in this verification mode, the detector will perfor m a
series of ten verification tests and the LCD will flash Pcl. If the ten loop check ver ification tests all fail,
the Vital Output(s) to which the Loop Status Input(s) and/or Health Status Input(s) is (are) mapped will
be deactivated. The loop check test will be repeated at regular intervals depending on the value
programmed into the Loop Check Timer. The Vital Output(s) to which the Loop S ta t us I nput(s) a nd / o r
Health Status Input(s) is (are) mapped will not be activated until the problem with the check loop is
corrected and the channel reset or until the Loop Check function is turned off. During a check loop
failure the LCD will flash Lcl. NOTE: If the Loop Check Timer is set to 0 minutes, the Loop C heck
function is off.
S
YNCH MODE: The Synch feature provides a means of linking up to four E-1400 detectors together.
There are two modes in which the detectors can be configured to operate; Series Synch or Parallel
Synch.
Series Synch mode can be used to eliminate the possibility of cross talk between adjacent loops. Series
Synch will activate one loop at a time, cycling through all loops configured to de tect in the Series
Synch mod e. W he n the detector system is configured to operate in Series Synch mo de, it is necessary
for one detector to be identified as the master unit, i.e. the detector that starts the Synch pulse. This
master unit must be assigned a Detector ID value of 000. The scanning sequence of detector loop input
channels is Detector ID 000 c hanne l 1, D etector ID 000 channel 2, Detector ID 000 channel 3, Detector
ID 000 channel 4, second detector channe l 1, second detector channel 2, second detector channe l 3,
second detector channel 4, and so on until the synch pulse returns to the first detector. The Synch-out
of the first (master) unit is connected to the Synch-in of the second de tector; the Synch-out of the
second detector is connected to the Synch-in of the third detector. This connection scheme is continued
until the Synch-out of the last detector is connected to the Synch in of the first (master) detector.
When set to operate in Parallel Synch mode, all detectors configured to operate in Parallel Synch mode
start scanning their respective channel 1 loop input s at the sa me t ime a nd the n pr oce ed to seq ue ntia ll y
scan their respective channel 2, 3, and 4 loop inputs. When the detector system is configured to operate
in Parallel Synch mode, it is necessar y for one detector to be identified as the master unit. This master
unit mus t be assigned a Detector ID value of 000. Connections between detectors differ from those in
Series Synch mo de in tha t the Sync h-out of first detector is connected to the Synch-in of the other
detectors and the Synch-in of the first detector is connected to the Synch-out of the other detectors.
Operation in either Synch mode require s that the Rese t inp uts ( pin DD of the lower primary interface
connector) of all detectors be tied together, the DC Common and S ync h C o mmo n inputs (pins BB and
Z of the upper primary interface connector) of all detectors be tied together, a nd the Synch 12 VDC
inputs (pin V of the upper primary interface connector) be tied to 12 VDC +. To sta rt operation in
either Synch mode, the detectors must be reset using the RES ET pin ( pin DD o f the lower primary
interface connector).
When ope ra tin g in Ser ies S ync h mo de, if a ny de tec tor fai ls to Sy nch, al l of t he V ita l Out put s o f ever y
detector configured to operate in Synch mode will be deactivated. If t he detector that has failed to
Synch has the Synch feature turned off, the other detectors configured to operate in Synch mode will
continue to operate in Series Synch mode.
When operating in Parallel Synch mode, if the master unit fails, all of the Vital Outp uts of every
detector configured to operate in Synch mode will be deactivated. If one or more of t he detectors
connected to the master unit Fails, only those Vita l Outputs of the detecto r(s) which has (have ) failed
will be deactivated.
When ope rating in either Series or Parall el mode, FSY will be d isplayed on the LCD screen o f the
detector(s) associated with the failure. This display state will continue until the problem is corrected
and the detectors are powered down and repowered, reset, or until the Synch function is turned off.
In either mode of operation, the S ynch feature will continue to function if one or more detectors has
(have) been disabled.
NOTES: The LCD backlighting
illuminates whenever any
pushbutton is pressed. Backlighting
will extinguish 15 minutes after the
last pushbutt on press .
Pressing any two or three
pushbuttons illuminates the LCD
backlighting, displays all LCD
segments, and illuminates the Vital
In, Vital Out, and Vital A ux Output
LEDs. The Output LEDs are
illuminated in their red phase as a
means of confirming proper
function of the detector’s Vital
Output failure feature.
The Model E-1400 detector has no DIP switches or jumpers to co nfigure. In order for the detector to
operate, an external EEPROM memory module MUST be connected to the EGMS rack. Plug the detector
into an appropriately wired rack and app ly power. If the detecto r is not new fro m the factory, it may be
advantageous to restore a ll factory default se ttings to avoid having to check every setting for every loop
input channel. To restore all factory default settings, disable the password protection feature as explained
below. Press and hold all fou r pushbutt on switches simultaneo usly for five seconds . When all four
pushbuttons are depressed and held, the display will start counting down from five (5). When the
countdown reaches zero (0), releasing the pushbuttons restores the factory default settings. Releas ing any
or all of the switches before the countdown ends aborts the full restore ope rat ion. Caution: Restoring the factory default settings will clear all previously programm ed settings including any m appe d output(s ).
All operating parameters can be adjusted from the front panel. The detector continues to operate normally
while it is in the Program Mode. The va lue currently displayed is always the actual va lue being used.
Example: If you are changing the delay time, the time displayed at the instant that a vehicle entered the
detection zone for that loop input channel would be the value used for the delay timer.
Pressing the FUNC pushbutton enters the Program Mode. The FUNC pushbutton has an auto repeat
function. This allows quick navigatio n to the desired parameter. The FUNC p ushbutto n only moves
forward through all of the parameters. There is no way to move backwards through the parameters.
While viewing any parameter, pressing the CHAN pushbutt o n w i ll displa y the same paramet e r i n t he next
loop input channel. The currently selected channel is indicated at the bottom of the LCD display.
Pressi ng a nd ho ldi ng the CHAN pushbutton for one second w ill exit the Progra m Mode and retur n to the
Normal Mode.
Pressing and holding either the (UP) or (DOWN) pushbutton will caus e the va lue to c ha nge rap id l y
until the pushbutton is releas ed.
Disabling Password Protection
To change any detector setting, the password protection feature must be disabled. When viewing a setting
in the Program Mode, press the (UP) or (DOWN) pushbutton to enter password entry mode. The
LCD will display PSd to provide an indication that a valid pass word must be e ntered be fore any detect or
setting can be changed. NOTE: Pressing the CHAN button for two seconds at any time will exit
password entry mode. Press the (UP) or (DO WN) p ushbut ton. The LC D dis play w ill c hange to
000 wit h the left most 0 flashing. Press the (DOW N) pus hbutto n to change the flas hing d igit to 9.
Press the CHAN pushb utto n a sec ond t ime to get the cente r 0 to flas h. Press the (U P) pus hbut ton t o
change the flas hing digit to 1. Press the CHAN pushbutton a third time to get the rightmost 0 to flash.
Press the (UP) pushb utton to change the flashing digit to 1. Press t he FUNC pushbutton to enter the
password. Detector settings can now be changed. Press the FUNC pushbu tton to e nter the passwor d.
Detector settings can now be changed. Password protection can be re-enabled by pres sing and holding the
CHAN p ushbutton for two seconds followe d by pressing the (UP) pushbutton twice. If no act ion is
taken to re-enable the password protection feature, it will be automatically re-enabled 15 minutes after
changing any detector setting.
Upon application of power, the LCD scre en will show the detector model letter and
firmware version, in this case, Model E-1400 fir mw a re ve rsion 3. This screen will be
displayed for two seconds.
The ne xt LCD scree ns displayed w ill show the Detector ID setting.
The display will toggle between the two screens shown with a 50%
duty cycle. When shipped from the factory, the Detector ID is set to
255 and the detector is considered to be uninitialized. This will be the
case on initial start-up. Before proceeding, the detector ID must be
changed to something other than 255. To do s o, use the (UP) or
(DOWN) button to change the sett ing to t he desired ID number. Whe n
set to the correct value, press the FUNC button to accept and store the
setting. If the detector in question is being used as the master unit
when ut iliz ing t he Sy nch fe atur e, t he Det ect or must be as signed an ID
value of 000.
The detector will ne xt co nfirm t he state o f the check loops c onnecte d to it. I f all four
check loops are connected and are intact, the LCD screen will display an indication of
the successful completion of the chec k loop verification. This screen will flash twice
.
If all four chec k loop s are not connec ted o r one (or more) is (are) d amaged in so me
way, the detector will initiate its check loop verification process. The LCD screen
will d ispla y a n ind ica tio n of a pe ndi ng st at e dur ing t he c hec k lo op ver ific atio n. T his
screen will flash for 55 seconds until one of three things happen; the check loop
verification fails, the check loop(s) causing the check loop verification is (are)
connected or restored to a functional state, or the check loop(s) causing the check loop
verification is (are) turned off, i.e. the Loop Check Timer of the loop(s) is set to 000.
If the check loop verification process continues for the entire 55 second
period and no action has been take n to connect or restore the check
loops causin g the check loop verificat ion, the LCD screen will toggle
between the two screens shown with a 50% duty cycle.
If the detector passes its check loop verification process or a pe nding loop check
failure state is resolved in one of the ways mentioned above, the LCD screen will
show a normal (idle) condition.
ETTINGS ........................ 256 selections - 00.0 to 25.5 Seconds in 0.1 second steps.
S
SETTING DISPLAYED ....... 7-segment display will show currently selected setting. . Loop
SEGMENT DISPLAY ....... Currently selected Extension time in seconds.
7-
EFAULT SETTING .......... 00.0 seconds.
D
E
XAMPLE ........................ Extension of 2.5 seconds selected for Primary Vital Output 1.
OTES ............................ If the loop input’s detection zo ne is occupied when this parameter
N
....................................... When viewing and/or setting the Primary Vital Output Extension
activates Series Synch (SYS), setting Option 7 to 7.02 activates
Parallel Synch (SYP).
changes it for all channels. Turning ON Option 8 automatically
turns OFF Option 9.
2 and Channel 3 is paired with channel 4. Changing the setting for
one channel also changes the setting for the paired channel.
Turning ON Option 9 automatically turns OFF Option 8.
symbol indicates which Primary Vital Output the Delay time
applies to.
is changed, it will not take effect until the detection zone is empty
or the loop input is reset.
settings, use the CHAN button to advance to the Delay time
settings of the next Primary Vital Output.
symbol indicates which Primary Vital Output the Extension time
applies to.
is changed, it will not take effect until the detection zone is empty
or the loop input is reset.
time settings, use the CHAN button to advan ce to the Extension
time settings of the next Primary Vital Output.
ETTINGS .....................256 selections - any and all combinations of the four
Loop Status Inputs and the four Vital Inputs (Vital
In).
S
ETTING DISPLAYED ....Bargraph indicates Loop Sta tus Inputs and/or Vital
Inputs mapped to the Primary Vital Outputs. In
Loop Status Input mode, the leftmost segment =
Loop St atus Inp ut 4, next s egment = Lo op Status
Input 3 , next segment = Loop Status Input 2 , next
segment = Loop Status Input 1. In Vital Input
mode, the center four segments are used. The
leftmost center segment = Vital Input 4, next
segme nt = Vita l Input 3, next segment = Vita l Inp ut
2, next segme nt = Vital Input 1. T he loop symbol
indicates which Primary Vital Output the Loop
Status Inputs and/or Vital I nputs a re bein g mapped
to.
7-
SEGMENT DISPLAY ....7-segment display will show currently selected
setting. The first character cor responds to the Loop
Status Inputs mappe d to the Primary Vital Outputs ,
the second character corresponds to the Vital I nputs
mapped to the Primary Vital Out puts.
D
EFAULT SETTINGS .....Primary Vital Output 1 = 00. No Loop Status
Inputs mapped to Pr imary Vita l Output 1. No V ital
Inputs mapped to Primary Vital O utput 1.
.....................................Primary Vital Output 2 = 00. No Loop Status
Inputs mapped to Pr imary Vita l Output 2. No V ital
Inputs mapped to Primary Vital O utput 2.
.....................................Primary Vital Output 3 = 00. No Loop Status
Inputs mapped to Pr imary Vita l Output 3. No V ital
Inputs mapped to Primary Vital O utput 3.
.....................................Primary Vital Output 4 = 00. No Loop Status
Inputs mapped to Primary Vital Outp ut 4. No Vital
Inputs mapped to Primary Vital O utput 4.
E
XAMPLE ......................Loop Status Inputs 1, 2, & 3 ma pped to Primary
Vital Output 1. No Vital Inputs mapped to Pr imary
Vital Output 1.
N
OTES ..........................The characters are displayed in Hexadecimal
notation (Base 16).
.....................................When viewing and/or setting the Primary Vital
Output mapping settings, use the FUNC button to
advance to the mapping settings of the next Primary
Vital Output.
.....................................A Primary Vital Output is deactivated if no Loop
To set the mapping status of the Loop Status Inputs, repeatedly press the FUNC button to enter
Program Mode and toggle through the set-up paramete rs until the display screen shows the bargraph
and two of the seve n-segment display characters. The left character and a loop symbol will flash
indicating the current setting and t he four leftmost bargraph segments will show the c orresponding
Loop Status Input mapping. Use t he (UP) or (DOWN) button to change the setting to the desired
config uration. Us e the FUNC b utton to ad vance to the next Primary Vital Output (indicated by a
flashing numbered loop symbol at the bottom of the LCD screen). The various combinations o f displa y
characters and bargraph display are shown below.
To set the mapping status of the V ital Inputs when in t he Prima ry Vital Output Mapping Program
Mode, press the CHAN butto n once. The right charac ter and a loop symbol w ill flash indicating the
current setting and the center four bargraph segments will show the corresponding Vital Inputs
mapping. Use the (UP) or (D OWN) b utton to c hange the setting to the desired configuration.
Use the FUNC butt on to adva nce to the next Primary Vita l Outp ut (indicated by a flashing numbered
loop symbol at the bottom of the LCD screen). The various combinations of display characters and
bargra ph disp lay are s hown belo w.
When in Normal Mode, repeatedly press the FUNC b utton to enter Program Mode and toggle thro ugh
the set-up parameters until the display screen shows the bargraph and two of the seven-segment d is play
characters. The left c haracter and a loop symbol will flash indicating t he current se tting and the four
leftmost bargraph segments will show t he corresponding Loop Stat us I nput mapping. Press the C HAN
button once. The right characte r and a loop symbol will flash indicating the current setting and the
center four ba rgra ph s eg ment s w ill s how t he c orr esp ond ing Vit al I np uts mapping. U se the (UP ) or (DOWN) button to change the setting to the desired configuration. Use the FUNC button to advance
to the ne xt Pr imar y Vita l Output (indicated by a flashing numbered loop symbol at the bottom of the
LCD screen). The various combinations of display characters and bargraph display are shown below.
5.2.2 Auxiliary Vital Output (Vital Aux) Mapping Screens
P
ARAMETER .................Auxiliary Vital Output (Vital Aux ) Mapping.
S
ETTINGS .....................4096 selections - any and all combinations of the four Loop
Status I np u t s , fo ur V ita l I np ut s (Vital In), and the four Hea lt h
Status Inputs.
S
ETTING DISPLAYED ....Bargraph indicates Loop Status Inputs, Vital Inputs, and/or
Health Status Inputs mapped to the Auxiliary Vital Outputs.
In Loop Status Input mode, the leftmost segment = Loop
Status Input 4, next segment = Loop Status Input 3, next
segme nt = Lo op Sta tus I nput 2, next segment = Loop Status
Input 1. In Vital Input mode, the center four segments are
used. The leftmost center segment = Vital Input 4, next
segme nt = V ital Inpu t 3, next segment = Vital Inp ut 2, next
segme nt = Vital I nput 1. In Health Sta tus Input mode, the
rightmost segment = Health Stat us Input 1, next segment =
Loop Status Input 2, next seg ment = Loop Status Input 3, next
segment = Loop Status Input 4. T he loop symbol indicates
which Auxiliary Vital Output the Loop St atus Inputs, Vital
Inputs, a nd/or Hea lth Status Inp uts are bein g mapped to.
7-
SEGMENT DISPLAY ....7-segment disp lay will show currently sele cted setting. The
first character corresponds to the Loop Status I nputs mapped
to the Auxiliary Vital Outputs, the second character
corresponds to the Vital Inputs mapped to Auxiliary Vital
Outputs, and the third character corresponds to the Health
Status Inputs mapped to the Auxiliary Vita l Outputs.
D
EFAULT SETTINGS .....Auxiliary Vital Output 1 = 000. No Loop Status Inputs
mapped to Auxiliary Vital O utput 1 . No V ital I nputs mapped
to Auxiliary Vital Output 1. Health Status Input 1 not
mapped to Auxiliary Vital Output 1.
.....................................Auxiliary Vital Output 2= 000. No Loop Status Inputs
mapped to Auxiliary Vital Output 2. No V ital I nputs mapped
to Auxiliary Vital Output 2. Health Status Input 2 not
mapped to Auxiliary Vital Output 2.
.....................................Auxiliary Vital Output 3 = 000. No Loop Status Inputs
mapped to Auxiliary Vital O utpu t 3, No V ital I nputs mapped
to Auxiliary Vital Output 3. Health Status Input 3 not
mapped to Auxiliary Vital Output 3.
.....................................Auxiliary Vital Output 4 = 000. No Loop Status Inputs
mapped to Auxiliary Vital O utpu t 4. No V ital I nputs mapped
to Auxiliary Vital Output 4. Health Status Input 4 not
mapped to Auxiliary Vital Output 4.
E
XAMPLE ......................Loop Status Inputs 1, 2, & 3 mapped to Auxiliary Vital
Output 1. No Vital Inputs mapped to Auxiliary Vital Output
1. Health Status Inputs 1, 2, 3, & 4 mapped to Auxiliary Vital
Output 1.
N
OTES ..........................The characters are displayed in Hexadecimal notation (Base
16).
.....................................When viewing and/or setting the Auxiliary Vital Output
mapping settings, use the FUNC button to advance to the
mappi ng setti ngs of the next Auxiliary Vita l Output.
.....................................An Auxiliary Vital Output is deactivated if no Loop Status
Inputs, Vita l Inputs, or Health Status Inp uts are mapped to it.
To set the mapping status of the Loop Status Inputs, repeatedly press the FUNC button to enter
Program Mode and toggle through the set-up pa rameters until the display scree n shows the bargraph
and thr ee of the seven-segme nt display characters. The left charac ter and a loop symbol will flash
indicating the current setting and t he four leftmost bargraph segments will show the c orresponding
Loop Status Input mapping. Use the (UP) o r (DOWN) button to change the setting to the desired
config uration. Use the FUN C button t o advance to the next Auxiliary Vital Output (indicated by a
flashing numbered loop symbol at the bottom of the LCD screen). The various combinations o f displa y
characters and bargraph display are shown below.
To set the mapping status of t he Vital Inputs whe n in the Auxiliar y Vital Output Mapping Program
Mode, press the CHAN button once. The center character and a loop symbol will flash indicating the
current setting and the center four bargraph segments will show the corresponding Vital Inputs
mapping. Us e t he (UP) or (DOWN ) b utton to change the setting to the des ired configuration.
Use the FUNC button to advance to the next Auxiliary Vital Output (indicated by a flashing
numbered loop symbol at the bottom of the LCD screen). The various combinations of display
characters and bargraph display are shown below.
When in Normal Mode, repeatedly press the FUNC button to enter Program Mode and toggle
through the set-up parameters until the display screen shows the bar graph and three of the sevensegment display characters. The left char acter and a loop symbol will flash indicating the current
setting and the four leftmost bargraph seg ments will show the corresponding Loop Status Input
mapping. Press the CHAN button once. The center character and a loop symbol will flash indicating
the current setting and the center four bargrap h segments will show the corresponding Vital Inpu ts
mapping. Us e t he (UP) or (D OW N ) b utt o n to cha nge the setting to the desired configurat ion.
Use the FUNC button to advance to the next Auxiliary Vital Output (indicated by a flashing
numbered loop symbol at the bottom of the LCD screen). The various combinations of display
characters and bargraph display are shown below.
To set t he mapp ing sta tus o f the He alth St atus I nputs when i n the Auxiliar y Vital Output Mapping
Program Mode, press the CHAN button once again. The right character and a loop symbol will flash
indicating the current setting and the four right most bargraph se gments will s how the correspo nding
Health Status Input mapping. Use the (UP) or (DOWN) button to change t he sett ing to t he
desired configuration. Use the FUNC button to advance to the next Auxiliary Vital Output
(indicated by a flashing numbered loop symbol at the bottom of the LCD screen). The various
combinations of display characters and bargraph display are shown below.
When in Normal Mode, repeatedly press the FUNC button to enter Program Mode and toggle
through the set-up parameters until the display screen shows the bar graph and three of the sevensegme nt dis play c haracters. The left character and a loop symbol will flash indicating the current
setting and the four leftmost bargraph segments will show the correspo nding Vital I nput mapping.
Press the CHAN button twice. The right character and a loop symbol will flash indicating t he
curre nt se tti ng a nd t he fo ur r igh tmos t ba rg rap h se gme nts w ill s how the cor res pond in g He alt h Sta tus
Input mapping. Use the (UP) or (DOWN) button to change the setting to the desired
config urat ion. Use t he FUN C but ton t o ad vance to the next Auxiliary Vita l O utput (indicated by a
flashing numbered loop symbol at t he bottom of the LCD screen). The various combinatio ns of
display charac ters and bargraph disp lay are s hown below.
ETTINGS ........................ Pressing the (UP) or (DOWN) button will clear the Loop
S
S
ETTING DISPLAYED ....... View only.
SEGMENT DISPLAY ....... Loop Failures since the last time it was cleared manually or due to
7-
EFAULT SETTING .......... 000.
D
E
XAMPLE ........................ There are eight Loop Failures in the accumulator for channel 1.
OTES ............................ Count will be reset to 0 after loss of power, pressing the (UP)
N
5.3 Normal Mode Display Screens
TATE Idle.
S
B
ARGRAPH DISPLAYOff.
SEGMENT DISPLAY Three Dashes.
7L
OOP INPUT LED OFF.
XAMPLE Loop Input Channel 1 is idle.
E
OTES This is the normal state for a loop input channel when the loop
N
S
TATE Call.
ARGRAPH DISPLAYNumber of sensitivity levels inductance change from vehicle
B
SEGMENT DISPLAY Call.
7-
OOP INPUT LED Solid ON.
L
E
XAMPLE Loop Input Channel 1 detection zone is occupied by a vehicle that
TATE Loop Inductance Display (Option 1 ON).
S
B
ARGRAPH DISPLAYOFF if no vehicle is detected. Number of sensitivity levels that the
SEGMENT DISPLAY Loop / Lead-In circuit inductance in microHenries. If the value
7-
EXT L=.
T
L
OOP INPUT LED The loop input LED operates as normal, indicating call as
EXAMPLEChannel 1 Loop / Lead-In circuit inductance is 98 microHenries
OTES If Option 2 (-ΔL/L Display) is ON, this display is only shown
N
Fail memory.
power failure.
or (DOWN) button, or a reset input to the RESET terminal on
the motherboard.
P
ARAMETER .................... Firmware Version and Revision.
ETTINGS.......................View Only.
S
ETTING DISPLAYED ....... View Only.
S
7-
SEGMENT DISPLAY ....... Model letter and firmware version on one scr een
D
EFAULT SETTING........... Not Applicable.
XAMPLE ........................ Model E-1400 firmware version 3, revision .00.
E
detection zone is unoccupied.
exceeds (first dot = current sensitivity level, second dot = next
lower sensitivity level, etc.).
exceeds the detection threshold by four sensitivity levels.
inductance change caused by the vehicle exceeds the detection
threshold (first dot = current sensitivity level, second dot = next
lower sensitivity level, etc.) if a vehicle is detected.
exceeds 999, the display will alternate between the thousands
place (1 or 2) and the lower three digits of the inductance value.
expected.
and it is not detecting a vehicle.
when the channel is not detecting a vehicle.
and revision on the other. The display will
toggle between the two screens with a 50% duty
cycle.
ARGRAPH DISPLAY ....OFF i f no vehic le is detec ted. Numb er of sens itivity levels
that t he induc ta nce cha nge ca used by the vehicle exceeds the
detection threshold (first dot = current sensitivity level,
second dot = next lower sensitivity level, etc.) if a vehicle is
detected.
7-
SEGMENT DISPLAY ....Percentage o f change in inductance of the Loop / Lead-In
circuit.
T
EXT .............................-∆L/L.
L
OOP INPUT LED .........The loop input LED operates as normal, indicating call as
expected.
E
XAMPLE ......................Loop Input Channel 1 detection zone is occupied by a vehicle
that exceeds the detection threshold by t hree (3) sensitivity
levels and Channel 1 percentage change of inductance is
0.087%.
N
OTES ..........................This display is only visible while the channel is detecting a
vehicle.
S
TATE ..........................LCD Display Te st.
B
ARGRAPH DISPLAY ....All segments on.
7-
SEGMENT DISPLAY ....All segments on.
T
EXT .............................All segments on.
L
OOP INPUT LED .........The loop input LED operates as normal, indicating call as
E
XAMPLE ......................All segments on.
N
OTES ..........................This dis pla y is v isi ble whe ne ver an y two or three pushbutton
The Model E-1400 stores operating para meters and detection reference settings in two places. The
detector hardware includes an internally mounted EEPROM and an externally mounted EEPROM
memory module. In order for the detector to operate proper ly, an external EEPROM memory module
MUST be connected to the EGMS rack.
Logic programmed into the detector operating firmware continually checks the data stored on the two
components listed above. This check function pro vides a means of verifying several key factors t hat
ensure that the detector is functioning properly. These incl ude:
Detector power up status - Has the detector powered up correctly and is it operating in the correct
state?
Detector Failure status - Are failure cond itions being identified and is the detector responding to
these failures correctly?
Stored data status - Is the data stored on each of the two data storage components consistent with
one another? This phase of the check function allows the user to program the detector with data
stored on a master external EEPROM module co nnected to the EGMS rack.
If the information obtained via the check function indicates that there is a problem with some phase of
the detector operation, the LCD screen will display one or more of the erro r messages listed below.
Uninitialized E xternal EEPR OM. The display will toggle between the
two screens s how n w it h a 5 0% du t y c ycle . Th is is a n ind ic at io n tha t the
external EEPR OM memory mod ule is missing, that it is not installed
properly, or that it is uninitialized. To correct this problem, verify that
the module is installed correctly and press the FUNC b ut t o n. I f the erro r
message does not clear, the external EEPROM memory module is
defective. Replace it with a functional module and press the FUNC
button to clear the error message. If the error message still does not
clear, return the detector to the factory for servicing.
Warning: If the error message clears after pressing the FUNC button,
the user must confirm that the stored detector settings are correct for the
installation in question.
Uninitialized Internal E EPROM. The display will toggle between t he
two sc ree ns sho w n w ith a 5 0% d u ty c yc le . Th is is a n i ndi ca t ion t ha t t he
internal EEPROM is uninitialized. To correct this problem, press the
FUNC button. If the error message does not clear, the internal EEPROM
is defective. Return the detector to the factory for servicing.
Warning: If the error message clears after pressing the FUNC button,
the user must confirm that the stored detector settings are correct for the
installation in question.
Uninitialized Internal a nd External EEPROMs. The dis play will togg le
between the two screens shown with a 50% duty cycle. This is an
indication t hat the internal EEPRO M and the external EEPROM memory
module are uninitialized. To correct this problem, press the FUNC
button. If the error message does not cle ar, the internal EEPROM and
the external EEPROM memory module are defective. Return the
detector to the factory for servic ing. NOTE: Clearing this error message
will reset the detector to factory default settings and will clear any
previously mapped output(s).
Warning: If the error message clears after pressing the FUNC button,
the user must confirm that the stored detector settings are correct for the
installation in question.
External EEPROM Error. The display will toggle between the two
1
1
screens shown with a 50% duty cycle. This is an indication that the data
stored on the external EEPROM memory module is co rrupt. Pres s the
FUNC button to copy the reference data stored on the interna l EEP RO M
to the external EEPROM memory module. If the error message does not
clear, the external EEPROM memory module is defective. Replace it
with a functional module and press the F UNC button to clear the error
message. If the error message still does not clear, return the detector to
the factory for servicing.
Warning: If the error message clears after pressing the FUNC button,
the user must confirm that the stored detector settings are correct for the
installation in question.
Internal EEPROM Error. The display will toggle between the two
screens shown with a 50% duty cycle. This is an indication that the data
stored on the i nternal EEPROM is corr upt. Pres s the FUN C butto n to
copy the reference data stored on the external EEPROM memory module
to the internal EEPROM. If the error message does not clear, the internal
EEPROM is defective. Return the detector to the factory for servicing.
Warning: If the error message clears after pressing the FUNC button,
the user must confirm that the stored detector settings are correct for the
installation in question.
Internal and External EEPROM Error. The display w ill toggle between
the two screens shown with a 50% duty cycle. This is an indication that
the data stored on the internal EEPROM and the external EEPROM
memory module is corrupt. Press the FUNC button to copy the reference
data stored on the microprocessor to the internal EEPROM and the
exter na l EEP RO M memory module. If the error message does not clear,
the internal EEPROM and the external EEPROM memory mo dule are
defective. Return the detector to the factory for servicing. NOTE:
Clearing this error message will reset the detector to factory default
settings and will clear any previously mapped output(s).
Warning: If the error message clears after pressing the FUNC button,
the user must confirm that the stored detector settings are corre ct for the
installation in question.
Detection Reference Error. This is an in dication that the in ternal EEPRO M and the
exter nal EEPR OM memory module detection reference values do not match. Press the
FUNC button to clear the error message.
Warning: If the error message clears after pressing the FUNC button, the user must
confirm that the stored detector settings are correct for the installation in question.
Warning: Clearing this error will reset all internal and external detection reference
values. If a vehicle (or vehicles) is (are) present over any or all loops at this time, the
inductance change caused by the vehicle(s) will be incorporated into the new baseline
detection reference and the vehicle(s) will no longer be detected.
The Loop Check feature is enabled whenever the Loop Check Timer for a specific loop
input is set to a value between 1 and 255 minutes. W hen the Loop Check Timer has
timed out, the detector will automatically short the check loop to simulate vehicle
detection. If t he percenta ge of inducta nce change is greater tha n or equal to -0.04%
ΔL/L, a nd t he c ha nne l o n w hic h t he c ur re nt loo p check test is selected and being viewed
Disabling the Loop Check feature (setting the Loop Check Timer to zero), powering down the detector,
or rese ttin g the c han nel tha t fa iled t he loop check test will clear the Loop Check failure. However, if
the problem that caused the Loop Check failure is not corrected, the c hannel will fail the next loop
check test.
The Loop Check feature is suppressed if the loop has an open, a shorted, or a relative (±25% ΔL/L)
failure.
The detector will perform a loop check tes t on all programmed channels two sec onds after start-up or
two seconds after a reset.
NOTE: If the Loop Check Timer is set to 000, the Loop Check function is off.
on the LC D, the display will show PAS.
If the percentage of inductance change caused by activating the check loop is less than -
0.04% Δ L/L, the detector w ill initiate its check loop verification process. The LCD
screen will display an indication of a pending state (Pcl) during the check loop
verification. This screen will flash for 55 seconds until one of three things happen; the
check loop verification fails (indication shown be low - Lcl), the check loop(s) ca using
the check loop verification is (are) connected or restored to a functional state (indication
shown above - PAS), or t he check loop(s) causing the check loop verification is (are)
turned off, i.e. the Loop Check Timer of the loop(s) is set to 000.
If the check loop verification fails, the LED corres ponding to that loop
channel will begin flashing at a three Hz rate. If the channel
corresponding to the check loop failure is selected a nd being viewed on
the LC D, the display will toggle betwee n a screen showing L and LOOP FAIL and a s cree n sho win g Lcl and LOOP FA IL with a 5 0% d uty cyc le
to indicate a that Loop Check failure has occurred. In addition, the loop
status will enter the Call state and the He alth Status will enter the Fail
condition. A Loop Check failure will de ac tivate a ny Pr imar y Vital Outp ut
to which any loop input or Health Status is mapped. When the Health
Status of one or more loop inputs is (are) mapped to an Auxiliary Vital
Output, a loop check failure will deactivate the Auxiliary Vital output.
5.6 Vital Input (Vital In) Status / Fail Indications
Each of the four Vital Inputs has a dedicated, dual color (green / red) LED which illumina tes in var ious
ways to indicate the state of the Vital Input. When the LED is off, the Vital Input is deactivated (low
volta ge leve l). W he n t he LED d isp la ys a s s ol id g re en, t he V ita l I np ut is a ct iva te d (h igh vo lta ge le ve l).
When the LED dis plays as s o lid red, the Vital Input has failed its self-check.
5.7 Primary Vital Output (Vital Out) Status / Fail Indications
Each o f t he f o ur Primary Vital Outputs has a dedicated, dual color (green / red) LED which illuminates
in var ious wa ys to indica te the state of the Primary Vital O utput. Whe n the LE D is o ff, the Primary
Vital Output is deactivated (low voltage level). When the LED displays as solid green, the Primary
Vital Output is activated (high volta ge level). When the LED displa ys as a tw o Hz flashing green,
timing delay is activated and the Primary Vital Output is functioning (low voltage level until delay
times out). When t he LED disp lays as a five Hz flas hing green, tim ing e xtens ion is act ivate d and t he
Primary Vital Output is funct ioning (low voltage leve l until exte nsion times out. When the LED
displays as solid red, the Primary Vital Output has failed its self-check.
5.8 Auxiliary Vital Output (Vital Aux) Status / Fail Indications
Each o f th e fo ur Auxilia ry Vita l O utputs has a dedicated, dual color (green / re d) LED that illuminates
in various ways to indicate the state of the Auxiliary Vital Out p u t. When the LE D is o ff, t he Auxiliary
Vital O utpu t is d eact ivat ed ( low vo lta ge leve l). Whe n the LED d ispla ys as soli d gre en, t he Auxiliary
Vital Out put is ac ti vat ed (h igh vo lta ge le ve l). Whe n t he LED d isp la ys a s s oli d re d, th e Auxiliar y Vital
Output has failed its self-check.
5.9 Synch Fail Indications
5.9.1 Series Synch Fail Indications
When the Synch feature is set to ope rate in Series Synch mode (Option 7 is set
to 7.01), the LCD will displa y SYS. If, after completing t he sampling routine,
the detector determines there is a failure on o ne or more loop inputs, the LC D
will dis p la y FSY and co nt in ue s a mpl ing. I f the Sy nc h fa il ure is cleared, the fail
indication (FSY) will no longer be displayed on the LCD.
5.9.2 Parallel Synch Fail Indications
When the Synch feature is set to operate in Parallel Synch mode (Opt ion 7 is set
to 7.02), the LCD will display SYP If, after completing the sampling ro utine,
the detector determines there is a failure on o ne or more loop inputs, the LC D
will dis p la y FSY and continue sampling. If the Synch fa ilure is cleared, the fail
indication (FSY) will no longer be displayed on the LCD .
If the total inductance of a channel’s loop input network goes out of the range
specified for the detector, or rapidly changes by more than ±25%, the loop input
channel will enter the Fail-Safe mode and disp lay LOOP F AIL on the LCD. 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. Fail-Safe mode generates a continuous
call. At the time of a loop failure, the loop input channel’s LED will begin to
flash at a rate of three flashes per second. The LED will continue this display
pattern 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 loop input channel will resume operation in a normal manner; except, the LED
will continue the three flashes per second display pattern, thus, pro viding an alert
that a prior Loop Fail condition has occurred. Each loop failure is counted and
accumulated into the Loop Fail Memory. The total number of loop failures for the
loop input channel (since the last power interruption or manual reset) is written
into the Loop Fail Memory and can be seen by stepping throu gh the channel’s
functions in Program Mode to the LOOP FAIL display.
This is a useful tool that can be used to identify inter mittent loop problems. If the count is extremely high for
the period of time observed, the problem is very likely a loose connecti on (check for loose connections at the
terminal strip and bad splices in the field). The Loop Fail Count is reset when power is removed from the
detector. This prevents the Loop Failure Count from moving to another loop if the detector is moved to a new
location.
To view the Loop Fail Count, select the desired loop input channel using the CHAN button then repeatedly
press the FUNC button until the LOOP FAIL display is shown. The Loop Fail Count display is after the
OPTION displays. Pressing the (UP) or (DOWN) button while the Loop Fail Cou nt is displayed, will
reset the count to zero.
5.11 Setting Sensitivity using the Bargraph
The bargraph is a graphical representation of the relative chan ge of inductance as seen by the detector loop
input channel; automatically taking into account sensitivity setting, loop geometry, configuration, lead-in
length, etc. The first bargraph segment repres ents the minimum inductance change (set by the sensitivity level)
necessary for the loop input channel to output a call. Each additional segment represents the inductance change
in excess of the next sensitivity threshold. Usually, the lar ger the vehicle detected, the more bargraph segments
displayed, i.e. the greater the -∆L/L. The bargraph can be used to select the proper sensitivity level.
The bargraph below shows the deflection (3 segments) of a vehicle with Sensitivity set to Level 5. The vehicle
in the loop zone is causing a change of inductance greater than 1.28% -ΔL/Lor Sensitivity Level 3.
The bargraph below has the same vehicle in the loop zone causing the same inductance change as above.
Because the sensitivity setting was increased to Level 8, six segments are now displayed. If the bargraph
displays 5 or 6 segments for a vehicle in the loop, the sensitivity has been set to the proper range.
Pressi ng a ll fo ur fro nt pa ne l p us hb utt on sw it che s si mu lta ne o us ly a nd co nt in uo us ly fo r five (5 ) s e co nds
restores all factory default settings. The countdow n of the five second pe riod is displa yed o n the LCD.
Releasing any or all of the switches before the countdown ends aborts the full restore operation. (See
Section 3.5 for default settings). Refer to Sect ion 5.0 for details. Caution: Restoring the factory default settings will clear all previously programmed settings including any m appe d outpu t(s).
5.13 Diagnostic F eat ur e s Acti vation
When the detector is operating in normal mode, pressing either the (UP) or (DOWN ) button will
temporarily activate Option 1 (Loop Inductance Display) and Option 2 (Loop Inductance -ΔL/L
Display) for all loop inputs and Optio n 6 (Audible Detect Signal) for the loop input ind icated in the
lower portion of the LCD. All t hree of these diagnostic options w ill remain active for 15 minutes.
5.14 Display Test
Pressing any two or t hree of the front panel s witches simulta neously w ill turn on a ll possible s ymbols
and mes sages o n the LCD screen.
5.15 Changing or Relocating Detectors
The Model E-1400 detector stores user-programmed parameters on an internal EEPROM and an
exter nal EEPR OM memo ry mo dule conne cted to the EGMS rack. This a llows t he use r to c hange or
relocate detectors and reset the parameters that were programmed for a particular site or detector.
When a new detector is installed or an existing detector is relocated, an Error message will ap pear on
the LCD. The LCD will alternate between Cpy and In. This message means that the parameters stored
on the internal EEPROM do not match the parameters stored on the external EEPROM memory
module. At this point, the user has two choices. Pressing the FUNC button will accept the parameters
stored on the inter nal EEPR OM a nd store them o n the e xterna l EEPR OM memory module. Pressing
either the (UP) or (DOW N) b utto n will change the alte rnat ing me ssa ge on t he LCD to Cpy and
Out. Pressing the FUNC b utton will acce pt the para meters stored o n the externa l EEPROM memory
module and st ore them on the int ernal EEPROM.
Parameters stored on the external EEPROM memory module do not
match those stored on the inte rna l E EPR O M. Pres si ng t he FU NC but to n
will accept the parameters stored on the internal EEPROM a nd store
them on the exte rna l EEPR OM module, i.e. copy the internal EE PROM
parameters to the external EEPROM module.
Parameters stored on the external EEPROM memory module do not
match those stored on the inte rna l E EPR O M. Pres si ng t he FU NC but to n
will accept the parameters stored on the external EEPROM memory
module and sto re them o n the int ernal E EPROM , i.e. c opy the e xternal
EEPROM memory module parameters to the internal EEPROM.
The Reno A & E Model E-1400 detector digitally measures changes in the resonant frequency of four
independent loop circuits to determine if a vehicle has entered the detection zone. The Model E-1400
detector applies an excitation voltage to each loop circuit res ulting in the loops oscillating at their resonant
frequencies. The current flow in the loop wire creates magnetic fields around the loop wire. When a
vehicle passes over the loop area, the conductive metal of the vehicle causes a loading of the loop’s
magnetic fie lds. The loading decreases the loop inductance, which causes the res onant frequency to
increa se . B y co nt in uo us ly s a mpl in g t he lo op’ s res ona nt fr eq ue nc y, t he ma gni t ude a n d ra te o f cha n ge c an
be determined. If the frequency change exceeds a selectable thres hold (set by the sen s it i vi t y s e t t in gs), the
detector will deactivate a vital output if one is mapped. If the rate of change is slow, typical of
environmental drift, the detector will continuously track and compensate for the change. T he Model E1400 detector also monitors the loop frequency for out of range conditions such as an open o r shorted loop
circuit.
The Model E-1400 detector is a scanning detector. The scanning method sequentially turns on and off
each channel’s loop oscillator. Each channel’s oscillator c ircuit supplies the excitation voltage that is
coupled to the loop circuit by a loop isolation tra nsformer. T he trans former p rovides high co mmon mode
isolation between the loop and detector electronics, which allows t he detector to operate on poor quality
loops including a single short to ground. The transformer also limits the amount of static energy
(lightning) that can transfer to the detector electronics. A spark gap transient suppression device is
connected across the loop inputs connected to the isolation t ransforme r. This de vice dissipa tes stat ic
charges prior to the transformer. A network of four capacitors is connected to the detector side of the
isolation transformer. Three of the capacitors can be switched in or out of the oscillator circuit to shift the
frequency of the loop oscillator circuit thus provid ing frequency separation between a djacent loops. The
three switchable capacitors are electronically switched using FETs and are selected when programming
parameter values wit h the fro nt panel pushbutton switches.
The outputs from the four loop oscillators are tied together a nd fed into a common sq uaring circuit. T his
is possible since the detector is a scanning detector allowing only a single loop osc illator to be operating at
any give n time. The sine wave from each loop oscilla tor circuit is squared to provide a precise zero
crossing signal for the input to the microcontro ller. This signal is called the loop sample. The loop
sample is an integr al number of complet e osci llatio ns from the loop oscillator circuit. The number of loop
oscillations counted is a function of the s elected sensitivity setting for the detector channel. The required
number of loop oscillations needed for a loop sample increases as the se nsitivity setting is increased. The
microcontroller uses the period of the loop sa mple for accumulating high-speed (32 MHz) crystal clock
pulses generated by the microcontroller’ s internal high-speed crystal oscillator. The number of crystal
clock pulses accumulated during consecutive loop samples is compared to the internal reference number
of crystal clock pulses stored in the mic r o contro l le r ’ s me mo ry.
When a vehicle enters the loop zone the loop inductance decreases. This decrease in loop inductance
causes an increase in the loop oscillator frequency. In turn, an increase in loop oscillator frequency results
in a decrease of the time period for the loop sample. Hence, when a vehicle enters the loop zone, the
number of crystal clock pulses accu mulated during a loop sample period decreases . By comparing the
new count with the reference count, a percentage change can be calculated that indirectly relates to the
inductance change. If the magnitude of the change exceeds a selectable threshold (sensitivity setting), the
detector deactivates a vital output if one is map ped . The rate of c hange is also monitored. S low rates o f
change caused by environmental fluctuations are tracked and automatically compensated for. This
process is conducted independently for each of the four loop oscillator circuits.
The microcontroller uses the high-speed crystal clock count to calculate the loop inductance, frequency
and percentage of change. If selected, the values are displayed on the seven-segment LCD. The
microcontroller also processes the pushbutton switch selections for the LCD display and stores the
operating parameters in non-volatile memory. Stored parameters are changed with the front panel
switches or vi a the front panel RS-23 2 communications port and are unaffected by loss o f power or
detector reset. The microcontroller co nt inuously proce sses the loop s amples a nd detec tor operat ion is not
effected during the operation of the switches or the LCD. NOTE: When either the sensitivity or
frequency of a loop input channel is changed, the loop inp ut channel is reset.
In addition, the microcontroller conditions the outputs based on Loop Status Inputs, Vital Inputs, Health
Status Inputs , and the programmed settings of the various timers (Primary Vital Output Delay, Primary
Vital Out put E xte nsion, and Loop Check) and options (Optio n 1, Option 2, Option 3, Optio n 4, Option 5,
Option 6 and Option 7).
The Reno A & E Model E-1400 Detector requires no maintenance. If you are having problems with a
Model E-1400 detector, use the troubleshooting tips be low to help determine the cause of the problem.
7.1 Basic Troubleshooting Tips
Detector Enclosure Checks:
Verify correct input voltage to the detector.
Check the detector diagnostics. If there is a current loop failure or t he loop fai l memory s hows a
loop failure has occurred, the problem is probably not related to the detector module.
Check the loop / lead-in cable resistance of the detect loops and the check loops. A value greater
than fi v e Ohms is an indic ation of a splice or connection problem or a broken loop wire.
Disconnect the detect loop or check loop from the detector. Use a 500 VDC Megger to measure t he
resistance from one of the loop wires to earth ground. It should be greater than 50 megOhms. If
lower, separate the splice at the pull box and isolate the problem to the loop or lead-in cable.
Verify all terminal screws are tight.
Inspect all loop connections in the detector enclosure, especially crimped lug connections. If
suspect, solder the lugs to the wire.
If the lightening or surge suppression devices on the loop inputs in the detecto r enclos ure are s uspect,
remove or replace them.
Check for places in the detector enclosure where the harness wires or lead-in cable may be pinched
or chaffed.
Make sure that each pair of interconnect (lead-in) wires for the loop(s) are individually twisted
together.
Field Checks:
Inspect the loop. Look for exposed wires, debris pressed into the loo p wires, p ave me nt s hifts , e tc .
Check s plices i n the pull box. The y must be so ldered and waterproofed. DO NOT USE WIRE
NUTS.
Check that each set of loop lead-in wires in each pull box is twisted toget her [six (6) twists per foot,
minimum] and that lead-in lengths are not excessive.
Always use a wire with cr oss-linked Polyethylene insulat ion (insulation type XLPE) for loop wire.
Typical sensing height is ⅔ of the shortest leg of a loop. Therefore, a 6΄ x 6΄ loop will have a detection height of
4΄.
The inductance of a con ventional four -sided loop can be estimated using the formula:
L = P x (T
2
+ T) / 4 Where: L = Loop Induct a nc e in mi c r o he n r ie s
P = Loop Perimeter in feet
T = Number of Turns of Wire.
Therefore, a 6΄ by 6΄ loop with 3 turns would have a n inductance o f:
L = (6 + 6 + 6 + 6) x (3
2
+ 3) / 4
L = 24 x (9 + 3) / 4
L = 24 x 12 / 4
L = 24 x 3
L = 72 microhenries.
The inductance of a Qua drupole
L = [P x (T
2
+ T) / 4] + [CL x (T2 + T) / 4] Where: L = Loop Inductanc e in microhenries
TM
loop can be estimated using the formula:
P = Loop Perimeter in feet
T = Number of Turns of Wire
CL = Len gth of Center Leg in feet.
Therefore, a 6΄ by 50΄ loop with a 2-4-2 confi guration would have an inducta nce of:
L = [(6 + 50 + 6 + 50) x (2
2
+ 2) / 4] + [50 x (42 + 4) / 4]
L = [112 x (4 + 2) / 4] + [50 x (16 + 4) / 4]
L = (112 x 6 / 4) + (50 x 20 / 4)
L = (112 x 1.5) + (50 x 5)
L = 168 + 250
L = 418 microhenries.
Loop Feeder cable typically adds 0.22 microhenries of inductance per foot of cable.
Total inductance of loops connected in ser ie s : L
Total inductance of loops connected in pa rallel: L