CENTURION FLUX SA Inductive Loop Detector Instruction Manual

: June 6, 2024
: CENTURION

Table of Contents

Introduction
IMPORTANT Safety Instructions
Product identification
Technical Specifications
Standard Features of the Detector
Relay Functionality
Mounting instructions
Electrical setup
Commissioning the System
Diagnostics
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INDUCTIVE LOOP DETECTOR

FLUX SA
POCKET INSTALLATION MANUAL

Centurion Systems (Pty) Ltd CENTURION FLUX SA Inductive Loop Detector -
FIG

Introduction

The FLUX SA is a single channel stand-alone inductive loop detector designed for vehicle access applications.
The detector is responsive, highly sensitive, and utilizes sophisticated software algorithms which adapt to prevent false triggering due to changing environmental conditions. Easy to use dipswitches, as well as visual and audible feedback of loop operation, ensure a hassle-free installation experience.
Typical uses include free-exit loops, safety loops, closing loops for traffic barriers, arming loops for access control equipment, and general vehicle sensing applications.

IMPORTANT Safety Instructions

All installation, repair, and service work to this product must be carried out by a suitably qualified person.
Do not in any way modify the components of the system.
Do not install this product near sensitive electrical components (e.g. the DOSS sensor inside a CentSyS gate operator housing).
Do not install the equipment in an explosive atmosphere: The presence of flammable gas or fumes is a serious danger to safety.
Before attempting any work on the system, cut electrical power and disconnect the batteries.
Do not leave packing materials (plastic, polystyrene, etc.) within reach of children, as such materials are potential sources of danger.
Dispose of all waste products like packaging materials, etc., according to local regulations.
Scentsy does not accept any liability caused by improper use of the product, or for use other than that for which the system was intended.
This product was designed and built strictly for the use indicated in this documentation. Any other use, not expressly indicated here, could compromise the service life/operation of the product and/or be a source of danger.
Anything not expressly specified in these instructions is not permitted.

Product identification

Connectors
FLUX SA housing
Bootloader header
Reset button
Diagnostic LEDs
Dipswitches
Dipswitch cover

Technical Specifications

Supply voltage| 10V – 40V DC
7V – 28V AC
---|---
Standby current| 50mA
Output relay rating| 1A @ 125V AC
Detection time| 4ms @ 100kHz loop frequency
10ms @ 40kHz loop frequency
IndicatorsVisual ****

Audible

| LED indicators showing Power, Loop Fault, Loop detection level (5 LEDs), Detect

Buzzer with an indication of loop detection level and loop fault

Standard Features of the Detector

Reset Button| Pressing the reset button enables the detector to be manually reset at any time. This results in the detector re-tuning the sensing loop and becoming ready for vehicle detection. In addition, a 0.5s output pulse will be generated.
---|---

Dipswitches

Run Switch| If this switch is ON, the detector is in Run Mode, and functions normally. If OFF, the detector halts, and the output relay default to the detected state. This is useful when working on a traffic barrier, as it will prevent the barrier from lowering.
---|---
Frequency Selection
Switch| 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 by approximately 25%. It may be necessary to change the frequency to prevent crosstalk between adjacent loops.
Buzzer Enable Switch| Controls the audible indicator – a useful diagnostic tool when setting up the loop
Pulse/Presence Switch| Configures the output as either pulsed or presence
Detect/Undetect Switch| If the pulsed output is selected, this switch configures the output pulse to be generated when the vehicle is either detected (enters the loop), or undetected (exits the loop).
Filter Switch| This switch enables a delay of two seconds between detection of the vehicle and switching of the output. This delay is normally used to prevent false detection of fast-moving objects.
Automatic Sensitivity Boost (ASB)
Switch| This option increases the sensitivity of the detector after the initial detection of a vehicle. This is useful to reliably detect vehicle and trailer combinations. Sensitivity returns to the selected value once the vehicle has been undetected.
Permanent Presence Switch| If selected together with Presence Output, the output will remain active as long as a vehicle remains on the loop. The danger of using this setting is that any change in the environment (for example the introduction of metal into the vicinity of the loop) will not automatically be tuned out without pressing the reset button. If not selected, the loop will automatically tune out any permanent
detection after five minutes.
Adjustable Loop Sensitivity Switches| Four sensitivity settings are available

Sensitivity

| SENS 1|

SENS 2

High|

OFF

| OFF
Medium-high|

OFF

|

ON

Medium-low|

ON

|

OFF

Low

|

ON

|

ON

LED indicators

Power Indicator LED| This red LED is on when power is present, and the controller is functioning.
---|---
Loop Fault Indicator LED| This red LED is illuminated when there is a loop fault. If the loop is an open circuit, the Fault LED will flash continuously. If the loop is a short circuit, it will remain on.
Detection Level Indicator LEDs| These five red LEDs provide a visual indication of the Detection Level. Once all five LEDs are on, the detection threshold is almost reached. This is a very useful feature to determine if the loop is going to perform reliably. With no vehicle in the vicinity, all the LEDs should be off.
Detect Indicator LED| 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

Relay Functionality

| Vehicle detected| No vehicle detected| Loop faulty| Power off
---|---|---|---|---
N/O| Closed| Open| Closed| Closed
N/C| Open| Closed| Open| Open

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 minimum cross- sectional area of 1.5mm. The feeder should be twisted at a rate of at least 20 turns per meter 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 (meters)	Number of turns

3 – 4
4 – 6
6 – 10
10 – 20

20| 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.

To minimize cross-talk, adjacent loops should be at least two meters apart, and on different frequency settings

8. The most reliable form of loop is performed and enclosed in conduit. This prevents water ingress and minimizes the effects of vibration.

9. Where a pre-formed loop is not practical, slots should be cut into 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.

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.

Electrical setup

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.)

8A. D5-Evo Free-exit Loop

8B. D5-Evo Closing Safety Loop

8C. Generic Connection Diagram

Commissioning the System

With the loop connected, apply power to the FLUX SA.
The red Power LED will light up, and the green Detect LED will flash until the loop has stabilized, and then turn off.
If the buzzer is enabled, it will sound continuously during this period.
Once the loop has stabilized, only the red Power LED should be on.
Bring a metal object towards the loop, and the Sense level LEDs will begin to light up, indicating the detection range of the loop.
Once all five lights have lit up, the unit will enter detect, with the green Detect LED lit.
If the buzzer is enabled, a variable tone will indicate the sense level and change to a continuous tone once the unit has been detected.
Configure the desired operational settings using the Dipswitches (open the access flap to access the Dipswitches).
Test the FLUX SA using a metallic object, or a vehicle.

Diagnostics

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 the low frequency and the detector with the smaller loop onto the high frequency.
The detector randomly detects, even though there is no vehicle
present| Faulty loop or loop feeder wiring.| Check the wiring. Tighten screw terminals. Check for pinched or bent wires. Is the feeder wire twisted?
Movement of the loop in the ground.| Check for cracks in the road surface near the loop.
The Loop Fault LED is flashing, and an audible tone is heard – two short tones, one long tone| The loop inductance is too large, or the loop is an 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 permanently illuminated, and an audible tone is heard – one short tone, one long tone| The loop inductance is too small, or the loop is short-circuited.| 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.

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CENTURION FLUX SA Inductive Loop Detector - FIG 3