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
10. Diagnostics
9. Commissioning the system
1. With the loop connected, apply power to the FLUX 11
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 11 using a metallic object, or a vehicle.
