Operating instructions
LMA-1250-LP “DEFLECTOMETER
TM
” Series Operating Instructions
Low Power Single Channel / Dual Output Inductive Loop Vehicle Detector
102112 Eberle Design Inc. Page 1
pn 888-1251-001 3510 E Atlanta Avenue, Phoenix, AZ 85040 USA
Tel: 480-968-6407 Web: www.EDItraffic.com
1. Connect to proper source voltage
Verify the source voltage before applying power. The “Pin Assignment” side label on the unit indicates the input power required for each model and indicates either Fail
Safe operation or Fail Secure operation.
MODEL 10-40 VDC or 14-35 VAC 95 VAC to 250 VAC Fail Safe Fail Secure
LMA-1250-LP
FAIL SECURE OPERATION
OUTPUT RELAY
POWER FAILURE
LOOP FAILURE
A
No Output
See Output A Mode (DIP 8)
B No Output See “Output B Mode” Table
2. DEFLECTOMETER
TM
Indications
STATUS
DEFLECTOMETER
0
No Call
1, 2, 3, 4, 5, 6, 7, 8, 9 Sensitivity Meter (4, 5 & 6 = Optimum Sensitivity Setting for Loop & Lead-in Network)
d 2-Second Delay Timing
E 2, 5 or 10 Second Extension Timing
F
Current “Real Time” Loop Failure
3. LED Indications
All display indicators operate according to the table below following a power-up, reset, or pressing of the SENS or SENS buttons. The displays will then remain
active for two minutes. After two minutes the DEFLECTOMETER
TM
will turn off to save power. The POWER indicator will then pulse at approximately 2Hz. The OUTPUT
and FAULT indicators will always operate according to the table below:
STATUS
FRONT PANEL INDICATORS
POWER OUTPUT LOOP FAULT DEFLECTOMETER
Normal, No Call ON OFF OFF 0
Normal, Call ON ON OFF 1 thru 9
Output Delay Mode
ON
2 Hz Flash
OFF
d
Output Extension Mode ON 4 Hz Flash OFF E
Current Fault: Open Loop ON Single Flash Single Flash F1
Current Fault: Shorted Loop ON Double Flash Double Flash F2
Current Fault: 25% Inductance Change
ON
Triple Flash
Triple Flash
F3
Previous Fault: Open Loop ON Normal Single Flash Normal
Previous Fault: Shorted Loop ON Normal Double Flash Normal
Previous Fault: 25% Inductance Change
ON
Normal
Triple Flash
Normal
4. Setting Sensitivity - Front Panel Sensitivity Push Buttons
The DEFLECTOMETER
TM
(front panel 7-segment LED) aids in setting the LMA-1250-LP quickly and easily to the most optimum sensitivity level to ensure the trouble-
free detection of all vehicles, including motorcycles and high bed vehicles. For typical vehicles (mid-size vehicle / small pick up) utilizing properly installed roadway
loops, a value of 5 displayed on the DEFLECTOMETER
TM
during the DETECT output period indicates an optimum sensitivity setting. For high profile vehicles (commercial
trucks, 4x4’s, etc…), a DEFLECTOMETER
TM
reading of 4 will be optimum. For low profile vehicles (sports cars, etc…), a DEFLECTOMETER
TM
reading of 6 will be optimum.
Adjusting sensitivity using the DEFLECTOMETER
TM
(recommended):
The DEFLECTOMETER
TM
should read zero (0) with no vehicle over the roadway loop. When the typical vehicle is completely in the detection zone (OUTPUT indicator
On), the sensitivity should be adjusted up or down until the DEFLECTOMETER
TM
displays the desired optimum value of 5 (or 4 or 6 as described above).
If a typical vehicle located over the roadway loop causes the number “7” to be displayed on the DEFLECTOMETER
TM
, the sensitivity should be
decreased two levels. This can be done by pressing the front panel SENS button two times.
If a typical vehicle located over the roadway loop causes the number “2” to be displayed on the DEFLECTOMETER
TM
, the sensitivity should be
increased three levels. This can be done by pressing the front panel SENS button three times.
NOTE: THE DEFLECTOMETER
TM
DYNAMICALLY UPDATES AFTER EACH SENSITIVITY LEVEL CHANGE, ALLOWING YOU TO CHANGE SENSITIVITY
SETTINGS WHILE A VEHICLE REMAINS IN THE LOOP DETECTION ZONE.
Adjusting sensitivity without using the DEFLECTOMETER
TM
(manually setting sensitivity):
The LMA-1250-LP offers 10 levels of sensitivity (0 to 9). Level 9 is the highest sensitivity. Sensitivity can be manually set to any desired level by pressing the front panel
SENS buttons ( or) when a vehicle is NOT over the roadway loop. The first time a SENS button ( or) is pressed, the current sensitivity level is displayed on the
DEFLECTOMETER
TM
for 5 seconds. If either SENS button ( or) is pressed again before the 5 second period ends, the sensitivity setting will increase (SENS ) or
decrease (SENS ). The new sensitivity value will then be displayed on the DEFLECTOMETER
TM
display for 5 seconds. The factory default Sensitivity setting is level 4.
5. Rear Panel DIP Switches
Loop Frequency – Two Position DIP Switch
SWITCH
LOW
MEDIUM – LOW
MEDIUM – HIGH
HIGH
FACTORY DEFAULT
1 ON OFF ON OFF OFF
2
ON
ON
OFF
OFF
OFF
Loop Frequency is controlled by the rear panel 2-Position DIP switch. On occasion, loops are placed in close proximity and it is necessary to select a different
frequency level for each loop to avoid interference (crosstalk). Four frequencies are selectable, HIGH being the factory default.
Measuring Loop Frequency: With no vehicle in the detection zone, press RESET and review the two or three digits (in Kilohertz) that quickly flash before the
DEFLECTOMETER
TM
changes back to zero. The most significant digit of the frequency is flashed first in the sequence. This unique feature allows you to read and reliably
separate the frequency of each detector loop. The LMA-1250-LP frequency should be adjusted such that there is a minimum of 5 Kilohertz of separation between all
adjacent loops. Loop frequency is also displayed at power-up.