Centurion LD200 Series User manual

1 High - 0.01%
2 - 0.02%
3 - 0.05%
4 - 0.1%
5 - 0.2%
6 - 0.5%
7-1%
8 Low - 2%
The LD200 is a dual channel inductive loop detector. The use of microprocessor and surface mount
technology enables a large number of functions to be incorporated into a small package. The LD200 is
compatible with most single channel detectors on the market and is easy to set-up and install.
Typical applications in the parking and access control environments are safety loops, arming loops and
entry or exit loops as well as direction logic.
Standard features of the detector are:
!RESET SWITCH
Pressing the reset switch enables the detector to be manually reset during commissioning and
and testing. This results in the detector re-tunning the sensing loop and becoming ready for
vehicle detection.
!SWITCH SELECTABLE SENSITIVITY
The detect sensitivity is the minimum change in inductance required to produce a detect output.
(% L/L).
Eight sensitivity settings are available on the switches to allow flexibility in configuration.
!SWITCH SELECTABLE FREQUENCY
The frequency of the loop is determined by the inductance 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.
!SELECTABLE EXTEND TIME
When switched on this feature extends the outputs for 2 seconds.
!PULSE RELAY SELECTION
The detect relay may be configured for a pulse output, and to energise on detection of a vehicle or
when the vehicle leaves the loop.
!SELECTABLE N/O OR N/C RELAY OUTPUT
Internal jumpers enable the output relay contacts to be configured for normally open or normally
closed contacts.
!DIRECTION LOGIC
This feature enables the detector to give a pulse output on relay 1 for a vehicle travelling from loop
1 to loop 2 and a pulse output on relay 2 for a vehicle travelling from loop 2 to loop 1. To enable this
feature switches 2 and 4 must be on.
!SELECTABLE PULSE TIME
This feature sets the length of time that the pulse will be energised for. 1 Second or 0.2 Second.
!POWER INDICATOR
This LED indicator illuminates when power is present.
LD200 SERIES
VEHICLE LOOP DETECTOR
LD200 SERIES
VEHICLE LOOP DETECTOR

Page 2
TECHNICAL DATA
POWER REQUIREMENT: LD200 200 - 260VAC 50Hz 1.5VA
LD201 100 - 120VAC 60Hz 1.5VA
LD202 11 - 26VAC/DC 50/60Hz 95mA max.
PRESENCE/PULSE RELAY: 0.5A/220VAC.
RESPONSE TIME: Approximately 120ms after vehicle enters loop.
INDICATOR: LED indicators show: Power, Detect State and Loop Fault.
DETECTOR TUNNING RANGE: 15 - 1500 uH.
PROTECTION: Loop isolation transformer with lightning protection.
CONNECTOR: 11 Pin connector on rear of unit.
DIMENSIONS: 80mm (height) X 40mm (width) X 79mm (Depth excl. Connector)
SWITCH SETTINGS
NO.
10
7, 8, 9
7, 8, 9
7, 8, 9
7, 8, 9
7, 8, 9
7, 8, 9
7, 8, 9
7, 8, 9
6
5
4
3
2
1
FUNCTION
Extend time
Sens 0.02%
Sens 0.01%
Sens 0.05%
Sens 0.1%
Sens 0.2%
Sens 0.5%
Sens 1%
Sens 2%
Frequency
Mode Ch1
Mode Ch1
Mode Ch2
Mode Ch2
Pulse time
Puls
Undet
1 Sec
Pres
Det
0.2 Sec
Off
S7/S8/S9
S7/S8
S7/S9
S7
S8/S9
S8
S9
-
High
Pres
Det
2 secs
-
S9
S8
S8/S9
S7
S7/S9
S7/S8
S7/S8/S9
Low
Puls
Undet
ON OFF
SWITCH SETTINGS
!DETECT INDICATOR
The LED indicator is illuminated when there is a vehicle over the loop or the loop is faulty. This LED
can also be used to determine the loop frequency. On reset, count the number of times the LED
flashes. Multiple this number by 10KHz. For example: if the LED flashes 6 times, then the loop
frequency is between 60KHz and 70KHz.
!LOOP FAULT INDICATOR
This LED indicator is illuminated when the loop is either open circuit or short circuit and is used to
give a visual indication of a faulty loop.

Page 3
SYMPTOM POSSIBLE CAUSE SOLUTION
The POWER LED is not on.
The DETECT LED flashes erratically.
The DETECT LED randomly
stays on.
The LOOP FAULT LED is flashing.
The LOOP FAULT LED is
permanently illuminated.
No power supply voltage on the
input.
There may be a poor connection in
the loop or loop feeder.
The detector may be experiencing
crosstalk with the loop of an
adjacent detector
Faulty loop or loop feeder wiring.
Movement of the loop in the ground.
The loop inductance is to small or
the loop is short circuit.
The loop inductance is to large
or the loop is open circuit.
Check that the power supply is
correctly wired to the detector.
(PINS 1 and 2)
Check all wiring. Tighten screw
terminals. Check for broken wires.
Try changing frequencies using the
frequency switch. Put the detector with
the larger loop onto low frequency and
the detector with the smaller loop onto
high frequency.
Check the wiring. Tighten screw
terminals. Check for pinched or bent
wires. Is the feeder wire twisted?
Check for cracks in the road surface
near the loop.
Check that there is no short circuit on
the loop feeder or the loop. If there is
no short circuit then the inductance is
to small and more turns of wire should
be added to the loop.
Check that there is electrical continuity
on the loop. This can be done using a
multimeter on the ohms range (<5 ).
If the loop inductance is to large then
try reducing the number of turns.
DIAGNOSTICS:
WIRING DIAGRAM:
PRESENCE / PULSE RELAY
OUTPUT 1
PRESENCE / PULSE RELAY
OUTPUT 2
LOOP 1 INPUT
LOOP 2 INPUT
POWER INPUT
LIVE 220VAC / 12VAC/DC
NEUTRAL / 12VAC/DC
EARTH
TWISTED
CABLE
TWISTED
CABLE
LOOP 1
LOOP 2
10 7
3
5
4
66
1
2
9
11 8

WEB: http://www.centsys.co.za General information e-mail: [email protected]
Page 4
RELAYS
(PRESENCE
OR PULSE)
PRESENCE
RELAY
N/O
N/O
N/C
N/C
PULSE
RELAY
VEHICLE
PRESENT NO VEHICLE LOOP FAULTY NO POWER
Closed Open Closed Closed
Open Closed Open Open
Pulse closed Open Open Open
Pulse open Closed Closed Closed
RELAY FUNCTIONALITY:
ROAD
EDGE
TRAFFIC DIRECTION
45° CROSSCUT FEEDER
1M
300mm300mm ROAD SURFACE
30 - 50 mm
4mm
SLOT
SEALANT
WIRES
CENTURION SYSTEMS (Pty) Ltd
148 Epsom Avenue, North Riding,
Randburg, South Africa
Tel: [phone] Fax: [phone] or
[phone] (Sales)
Share call number: 0860-103-726
1184.D.01.0002_3 LD200 Series Vehicle Loop Detector
INSTALLATION GUIDE
1. The detector should be installed in a waterproof housing as close to the loop as possible.
2. The loop and feeder should be made from insulated copper wire with a minimum cross-sectional
area of 1.5mm². The feeder should be twisted with at least 20 turns per metre. Joints in the wire
are not recommended and must be soldered and made waterproof. Faulty joints could lead to
incorrect operation of the detector. Feeders which may pick up electrical noise should use
screened cable, with the screen earthed at the detector.
3. The loop should be either square or rectangular in shape with minimum distance of 1 metre
between opposite sides. Normally 3 turns of wire are used in the loop. Large loops with a
circumference of greater than 10 metres should use 2 turns while small loops with a
circumference of less than 6 metres should use 4 turns. When two loops are used in close
proximity to each other it is recommended that 3 turns are used in one and 4 turns in the other
to prevent cross-talk.
4. Cross-talk is a term used to describe the interference between two adjacent loops. To avoid
incorrect operation of the detector, the loops should be at least 2 metres apart and on different
frequency settings.
5. For loop installation, slots should be cut in the road using a masonry cutting tool. A 45° cut should
be made across the corners to prevent damage to the wire on the corners. The slot should be
about 4mm wide and 30mm to 50mm deep. Remember to extend the slot from one of the corners
to the road-side to accommodate the feeder.
6. Best results are obtained when a single length of wire is used with no joints. This may be
achieved by running the wire from the detector to the loop, around the loop for 3 turns and then
back to the detector. The feeder portion of the wire is then twisted. Remember that twisting the
feeder will shorten its length, so ensure a long enough feeder wire is used.
7. After the loop and feeder wires haven been placed in the slot, the slot is filled with an epoxy
compound or bitumen filler.