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.

7, 8, 9

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 Ch2

Pulse time

Puls

Undet

1 Sec

Pres

Det

0.2 Sec

Off

S7/S8/S9

S7/S8

S7/S9

S8/S9

High

Pres

Det

2 secs

S8/S9

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

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/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

300mm300mm ROAD SURFACE

30 - 50 mm

4mm

SLOT

SEALANT

WIRES

CENTURION SYSTEMS (Pty) Ltd

148 Epsom Avenue, North Riding,

Randburg, South Africa

Tel: +27 (0)11 699-2400 Fax: +27(0)11 704-3412 or

+27(0)11 462-6669 (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.

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