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5 DIAGNOSTICS

SYMPTOM

POSSIBLE CAUSE

The POWER LED is

No power supply voltage

not on.

on the input.

The DETECT LED flashes

There may be a poor

erratically.

connection in the loop or

loop feeder.

The detector may be

experiencing crosstalk vith

the loop of an adjacent

detector.

The DETECT LED

Faulty loop or loop feeder

randomly stays on.

wiring.

Movement of the loop in

the ground.

The LOOP FAULT LED is

The loop inductance is to

flashing.

small or the loop is short

circuit.

The LOOP FAULT LED is

The loop inductance is to

permanently illuminated.

large or the loop is open

circuit.

WIRING DIAGRAM

PRESENCE RELAY

OUTPUT

TWISTED

LOOP

CABLE

LD100 220VAC / LD101 110VAC

LD102 12-24VAC/DC

EARTH

RELAY FUNCTIONALITY

VEHICLE

RELAYS

PRESENT

N/O

CLOSED

PRESENCE

RELAY

N/C

OPEN

PULSE

N/O

CLOSED

PULSE

RELAY

PULSE

N/C

OPEN

INSTALLATION GUIDE

• The detector should be installed in a waterproof housing as close to the

loop as possible.

• 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

SOLUTION

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 wiring 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 Ω). If

the loop inductance is to

large then try reducing the

number of turns.

PULSE RELAY

OUTPUT

LOOP INPUT

POWER INPUT

LOOP

NO VEHICLE

FAULTY

POWER

OPEN

CLOSED

OPEN

CLOSED

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.

• The loop should be either square or rectangular in shape with a 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.

• 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.

• For loop installation, slots should be cut in the road using a masonry

cutting tool. A 45o 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.

• 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.

• After the loop and feeder wires have been placed in the slot, the slot is

filled with an epoxy compound or bitumen filler.

TRAFFIC

DIRECTION

300mm

ROAD

EDGE

CROSSCUT

FEEDER

9 INDUCTIVE SENSOR - DETECTOR OF

METAL MASSES

The AC - 240 is a single 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 AC - 240 is compatible

with most single channel detectors on the market and is easy to set-up and

install.

Typical applications are: parking area and access control environments with

safety loops, arming loops and entry or exit loops.

Standard features of the detector are:

DIP-SWITCH no. 10:Reset Switch.

Pressing the reset switch enables the detector to be manually reset during

commissioning and testing. This results in the detector re-tuning the sensing

loop and becoming ready for vehicle detection.

DIP-SWITCESH no. 7-8-9. Switches of selectable Sensitivity.

Eight sensitivity settings are available on the switches to allow flexibility in

configuration.

SENSIBILITY

DIP 9

DIP 8

DIP 7

0,02 %

OFF

0,01 %

OFF

0,05 %

OFF

0,1 %

OFF

DIP-SWITCH n° 6: 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.

DIP-SWITCH no. 5: Sensitivity Boost.

This feature sets the undetect level to maximum sensitivity and is used to

prevent loss of detection of high-bed vehicles.

ROAD SURFACE

SLOT

30-50 mm

SEALANT

WIRES

4mm

SENSIBILITY

DIP 9

DIP 8

DIP 7

0,2 %

OFF

0,5 %

OFF

1 %

OFF

2 %