5. Relay functionality
Vehicle
detected
No vehicle
detected
Loop faulty
Power off
N/O
N/C
Closed
Open
Closed
Closed
Open
Closed
Open
Open
6. Tips for a successful loop installation
1.
The FLUX SA should be installed in a weatherproof location, such
as the inside of a gate operator, as close to the loop as possible.
2.
The loop and feeder should be constructed from XLPE (cross-
linked polyethylene) insulated multi-stranded copper wire with a
2
minimum cross-sectional area of 1.5mm . The feeder should be
twisted at a rate of at least 20 turns per metre to improve
reliability (Remember that twisting the feeder will shorten its
length, so ensure a long enough feeder wire is used). Feeders
which may pick up electrical noise should use screened cable,
with the screen earthed at the detector.
3.
Joints in the wire are not recommended, but where required must
be soldered and made waterproof.
Faulty joints will lead to unreliable operation.
4.
The loop should be either square or rectangular in shape with a
minimum distance of 1m between opposite sides.
5.
Two to six turns of wire are typically used in the loop – see table
below.
Loop perimeter (metres)
3 - 4
4 - 6
6 - 10
10 - 20
>20
Number of turns
6
5
4
3
2
6.
When two loops are laid in close proximity to each other, it is
recommended that different numbers of turns are used in each
loop to prevent cross-talk.
7.
Cross-talk describes the interference between two adjacent loops,
and can cause reliability issues.
.
8.
The most reliable form of loop is preformed and enclosed in
conduit. This prevents water ingress, and minimizes the effects of
vibration.
D5
D5
Evo
To minimize cross-talk, adjacent loops should be at least two
metres apart, and on different frequency settings
9.
Where a pre-formed loop is not practical, slots should be cut into
o
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
roadside to accommodate the feeder. After the loop and feeder
wires have been placed in the slot, the slot must be filled with an
epoxy compound or bitumen filler.
7. Mounting instructions
The housing of the
FLUX SA
is not weatherproof, and it should not be
mounted externally.
Rather mount the
FLUX SA
inside an operator or suitably
protected control box. Mounting points have been incorporated
into the design of the cover of the
FLUX SA
to assist you in
obtaining the optimal position.
8. Electrical setup
Symptom
Possible cause
Solution
The power LED
is not on
No power supply voltage
on the input.
Check that the power supply is
correctly wired to the detector.
The sense Level
LEDs flash
erratically
There may be a poor
connection in the loop or
loop feeder.
Check all wiring. Tighten screw
terminals. Check for broken wires.
The detector may be
experiencing crosstalk
with the loop of an
adjacent detector.
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.
Faulty loop or loop
feeder wiring.
Check the wiring. Tighten screw
terminals. Check for pinched or bent
wires. Is the feeder wire twisted?
The detector
randomly
detects, even
though there is
no vehicle
present
Check for cracks in the road surface
near the loop.
Movement of the loop in
the ground.
The loop inductance is
too large, or the loop is
open circuit.
Check that there is electrical continuity
on the loop. If the loop inductance is
too large then try reducing the number
of turns.
The Loop Fault
LED is flashing,
and an audible
tone is heard –
two short
tones, one long
tone
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 too small and more turns
of wire should be added to the loop.
The loop inductance is
too small, or the loop is
short circuited.
The Loop Fault
LED is
permanently
illuminated,
and an audible
tone is heard –
one short tone,
one long tone
Aux 12V out
D5-Evo
controller
COM1
FRX
COM2
Free-exit
loop
8A. D5-Evo Free-exit loop
8B. D5-Evo Closing safety loop
FLUX SA
Aux 12V out
D5-Evo
controller
COM1
IRBC
COM2
Closing
safety loop
FLUX SA
10. Diagnostics
This green LED Indicator is illuminated when there is
a vehicle detected. This LED can also be used to
determine the loop frequency. Reset or power up,
count the number of times the Detect LED flashes.
Multiply this number by 10KHz. For example: if the
LED flashes eight times, then the loop frequency is
approximately 80KHz
Detect
Indicator LED
Free-exit
loop
FLUX SA
Relay
output
Power
supply
(10-40V DC
7-28V AC)
8C. Generic connection diagram
Support stakes
(4 needed)
Curb
Metal-free zone
outline
1. Ensure that all low voltage systems (less than 42.4V) are
suitably protected from damage, by disconnecting all
sources of power such as chargers and batteries before
doing any work.
2. All electrical work must be carried out according to the
requirements of all applicable local electrical codes.(It is
recommended that a licensed electrical contractor perform
such work.)
9. Commissioning the system
Lead cable
slot
Corner stress
relief
4mm Saw slot
Pavement surface
50mm
4mm
Saw cut
1.
With the loop connected, apply power to the FLUX SA.
2.
The red Power LED will light up, and the green Detect LED will
flash until the loop has stabilized, and then turn off.
3.
If the buzzer is enabled, it will sound continuously during this
period.
4.
Once the loop has stabilized, only the red Power LED should be on.
5.
Bring a metal object towards the loop, and the Sense level LEDs
will begin to light up, indicating the detection range of the loop.
6.
Once all five lights have lit up, the unit will enter detect, with the
green Detect LED lit.
7.
If the buzzer is enabled, a variable tone will indicate the sense
level, and change to a continuous tone once the unit has detected.
8.
Configure the desired operational settings using the Dipswitches
(open the access flap to access the Dipswitches).
9.
Test the
FLUX SA
using a metallic object, or a vehicle.
www.centsys.com.au
0.07.B.0017 FLUX SA
Loop Detector
pocket manual 6Jul2012
