Inductive Sensors
Single or Dual Loop Detectors
Type LD with teach-in
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Single or Dual loop detector
Automatically adjustment of detection level
Manual sensitivity for compensations of variations
Easy installation via 11 pin circular plug
Rated operational voltage: 24 VAC/DC, 115 VAC or
230 VAC
Pulse or presence relay output
Output 1A/250 VAC SPDT relay
LED indication for power, relay status and loop fault
Sensitivity boost – only LDP1
Selectable frequency – prevents cross-talk
Direction logic – only LDP2
Product Description
Loop detectors for detection
of vehicles. The vehicle loop
detector is designed to handle
all parking, drive-through and
access control applications for
controlling doors, gates, barri-
ers or fences.
The principle is based on a
change in the inductance
within the loop when a metal-
lic object (vehicles) is passing.
The microprocessor evaluates
the changes.
Ordering Key
Type
Plug mounting
Loop inputs
Function
Adjustment
Outputs
Relay versions
Power supply
LDP1 SA1 B 230
Type Selection
Mounting
Single loop
Dual loop
Relay
SPDT
SPST
Ordering no.
Supply: 24 VAC/DC
LDP1SA1BM24
LDP2TA2BM24
Ordering no.
Supply: 115 VAC
LDP1SA1B115
LDP2TA2B115
Ordering no.
Supply: 230 VAC
LDP1SA1B230
LDP2TA2B230
Specifications
Rated operational voltage (U
B
)
Pin 2 & 1
230
115
M24
Rated insulation voltage
Rated impulse withstand voltage
Rated operational power
AC supply
AC/DC supply
Power on delay (t
V
)
Outputs
Minimum switching current
Rated insulation voltage
Relay Rating (AgNi 90/10)
Resistive loads
AC1
DC1
Mechanical life (typical)
Electrical life (typical)
Sensitivity
AC1
Frequency range
195 to 265 VAC, 45 to 65 Hz
98 to 132 VAC, 45 to 65 Hz
19.2 to 28.8 VAC/DC
<2.0 kVAC (rms)
4 kV (1.2/50 µs) (line/neutral)
3 VA
1.5 VA / 1.5 W
< 10 sec Typ. 4 sec
10 mA @ 12 V
250 VAC (rms) (cont./elec.)
µ (micro gap)
1 A / 250 VAC (250 VA)
1 A / 30 VDC (30 W)
≥
15 x 10
6
operations
@ 18’000 imp/h
> 250’000 operations
8 sensitivity settings available
Loop inductance
Operating frequency (f)
Relay output
Response time
Environment
Overvoltage category
Degree of protection
Pollution degree
Temperature
Operating
Storage
Housing material
Weight
AC supply
AC/DC supply
Approvals
CE marking
13 - 120 kHz
15 - 1500 µH
1 HZ
400 mS
III (IEC 60664)
IP 20 (IEC 60529, 60947-1)
2 (IEC 60664/60664A,
60947-1)
-40º to +70ºC (-40º to + 158ºF)
-50º to +85ºC (-58º to +185ºF)
NORYL SE1, light grey
150 g
85 g
UL508
Yes
Specifications are subject to change without notice (24.09.13)
1
LDP
Mode of Operation
Application
The LDP Vehicle Loop
Detector is based on micro-
processor technology, which
has enabled a large number
of functions to be imple-
mented. The functions are
primarily for use in the Park-
ing/Access Control Industry
like control for gates, barri-
ers, fences, etc.
Standard operations are
implemented including pro-
grammable pulse and pres-
ence option.
Principle
The Vehicle Loop Detector is
based on the inductive princi-
ple, using a coil of wire buried
in the driveway and connect-
ed to the loop detector.
The change in inductance
will be measured as a
change in frequency.
The output relay activates
when the loop is activated
and releases again when the
loop returns to a non-acti-
vated condition.
Setup
The loop has to be in a pas-
sive condition (no object in
the loop area) during start-
up and adjustment.
The loop detector will auto-
matically calibrate when the
reset button has been acti-
vated, which will be indicat-
ed by the yellow LED flash-
ing.
The functioning can now be
checked by activating the
loop with the actual object.
Now the yellow LED will go
on, and the output relay will
be activated according to
the dip-switch settings.
If the loop detector does not
react, the sensitivity must be
manual adjusted by means
of the dip-switches.
Important:
reset the system
after changing the Dip-
switch settings.
Temperature compensation
The frequency will increase
as a result of decreasing
temperatures and vice ver-
sa. To compensate for this,
or any other situation that
courses slowly change in
frequency, the LD auto tunes
constantly. That means if the
frequency changes slowly
there will be no detection.
The auto tune function com-
pensates for both increasing
or decreasing in frequency.
Fault detection
This function is useful if the
cable disconnect.
The alarm will be indicated via
the red LED in front of the
housing. This LED is constant-
ly lighting when the loop is
open or too large and flashing
when a short circuit occurs or
a loop is too small.
Sensitivity
8 sensitivity settings are
available on the dip-switch-
es in front of the module, to
allow flexibility in configura-
tion and application (Com-
pensation for variation in
loop construction).
Reset switch
The reset switch enables the
detector to be manually
reset during commissioning
and testing. The detector
will re-tune the sensing loop
and become ready for vehi-
cle detection.
Relay output
The single loop detector has
two SPDT relays – one for
pulse output and one for
presence output.
The dual loop detector has
two SPST relays – one for
each loop.
Pulse output (one shot): It is
possible to select the length of
the output period to 0.2s or 1
second. The pulse output can
be setup to activate on detec-
tion of a vehicle or when the
vehicle leaves the loop.
Presence output: The output
will be activated as long as
there is a vehicle parked in
the loop. It will be possible to
activate a filter (ON-delay of
2 seconds), which prevents a
false detection from a small
or fast moving object.
Pulse output mode
The relay activates only for a
short period when the vehi-
cle enters or leaves the loop.
Permanent output mode
The relay will remain active
as long as there is a vehicle
parked in the loop.
Pulse length
Extends the pulse length
from 0.2 sec to 1 sec.
On-delay
Prevents false detections of
small or fast moving objects.
Sense boost (only single
channel loop detector)
This feature sets the unde-
tected level to maximum
sensitivity and is used to
prevent loss of detection of
high-bed vehicles.
Selectable frequency
The frequency of the loop is
determined by the induc-
tance of the loop and the
frequency switch setting. If
the frequency switch is on,
the frequency is reduced. It
may be necessary to change
the frequency to prevent
cross talk between adjacent
loops.
The frequency function will
only change the frequency
of one channel of the dual
loop detector.
Important:
Be careful when
installing the detector next
to another inductive load, as
this can have an effect on
the detector and cause false
detections.
Loop Under
Roadway
Operation Diagram
LDP1 / Presence and Pulse mode
Power Supply
Vehicle Entering
Vehicle Leaving
Relay 1, Presence
Relay 2, Pulse
ON
OFF
Loop
t
ON
: 2 s
ON
OFF
t
P
: 0.2/1.0s
t
P
: 0.2/1.0s
2
Specifications are subject to change without notice (24.09.13)
LDP
Dip Switch Settings
Sensitivity
1
2
3
Minimum
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
Maximum
1
2
3
Direction logic
Function
The Dual loop detector
(LDP2) is implemented with
direction logic as standard.
The function enables the
detector to give a pulse out-
put on relay#1 for a vehicle
travelling from loop 1 to loop
2 and a pulse output on
relay#2 for a vehicle travel-
ling from loop 2 to loop 1.
Direction
Loop 1
If a vehicle is detected, and
the corresponding direction
is indicated, both loops must
be in a non-activated condi-
tion again before the next
object can be detected.
For Direction logic mode
set Dipswitch 5 to “Entering”
and Dipswitch 7 to “Pres-
ence”.
LDP1
1 sec
0.2 sec
4
Leaving
4
Entering
Pulse length
Pulse mode
2 sec
5
Off
5
6
Off
On
Loop 2
6
7
A
On delay
Sensitivity boost
B
7
8
Relay 1
Relay 2
Direction
8
Loop frequency “Cross talk”
LDP2
1 sec
0.2 sec
4
Leaving
4
Entering
Pulse length
Pulse mode
2 sec
5
Off
5
6
Pulse
Presence
6
7
A
On delay
Pulse/presence mode
B
7
8
8
Loop frequency “Cross talk”
Important:
Reset the detector
after changing the
Dip-switch settings
Loop Diagram
Loop installation
The loop geometry must be
adapted to the respective
application. The setup will be
optimal if the loop has the
same size as the object to be
detected.
After determining the loop
geometry, a groove must be
cut in the ground for installing
the loop.
Cut an inclined groove of 45°
angle at the corners of the
loop, which will protect it from
excessive wear.
Clean the groove for moisture
and place the wire as tight as
possible along the button of
the groove.
Before sealing up the groove,
it is recommandable to check
the loop inductance using a
measuring device. Optimum
value: 80-300 µH.
When sealing up the groove,
ensure that the temperature of
the sealing compound does
not exceed the max tempera-
ture of the loop insulation, as
this might cause an earth
fault.
Loop turns
The number of turns strongly
depends on the circumference
of the loop. The smaller the
loop, the more turns are
required.
Cable Recommandations
- Use 1.5mm squared cable.
Use silicon coated cable, if
placed directly into the ground
- Use 2m of spacing between
two adjacent loops.
- Use screened feeder cable in
electrically noisy environments
or where feeder runs parallel
to power cables.
Loop circumference
(m)
>10
6-10
<6
No. of turns
2
3
4
Twisted wire -->
Twisted
per
->
20 turns
wire
meter
20 turns per meter
max length: 20
m
mt
max lenght: 20
45°
ROAD
Max depth into
Max depht into
road: 50mm
road: 50 mm
Typical 30 mm
Typical 30 mm
2m
4
Specifications are subject to change without notice (24.09.13)
1
m
300 mm
300 mm
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