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BFT RME Instrucciones De Instalación página 10

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ENGLISH
RELAY FUNCTIONALITY:
RELAYS
VEHICLE PRESENT NO VEHICLE
N/O
PRESENCE
RELAY
N/C
N/O
PULSE CLOSED
PULSE
RELAY
N/C
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 1.5mm
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 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.
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 have been placed in the slot, the slot is filled with an epoxy compound or bitu-
men filler.
8. When using "Direction Logic", position the loops close enough together for the car to engage
both as it goes through.
TRAFFIC
300mm
O
45
CROSSCUT
10 - RME - RME BT
CLOSED
OPEN
OPEN
CLOSED
OPEN
PULSE OPEN
CLOSED
DIRECTION
300mm
1M
FEEDER
INSTALLATION MANUAL
RME BT
LOOP FAULTY NO POWER LOOP FAULTY NO POWER
CLOSED
OPEN
OPEN
CLOSED
ROAD SURFACE
SLOT
SEALANT
ROAD
EDGE
CLOSED
CLOSED
OPEN
OPEN
OPEN
CLOSED
CLOSED
OPEN
WIRES
4mm
RME
CLOSED
OPEN
CLOSED
OPEN
.
2
1 2
30-50 mm

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