General Information; Main Characteristics - PRASTEL MLX24A Manual Del Usuario

MLX24A – MLX220A
1.

GENERAL INFORMATION

MLX24A and MLX220A are two undecal, skirt-board, electromagnetic detectors especially designed and built for the management of
magnetic coils and for generating two command signals upon a metal body of considerable size, such as a motor vehicle, motor cycle,
etc., passing over them.
2.

MAIN CHARACTERISTICS

Magnetic coil connection
Easy operation by means of dip-switch
Two relay outputs
Function selection by means of binary 8-way dip-switches
3. TECHNICAL FEATURES
FEATURES
Power supply
Consumption
Connectable loop
Number of outputs
Types of outputs
Output 1 (OUT1)
Output 2 (OUT2)
Relay contact capacity
Signal
Working temperature
Size / Weight
4. REALISATION OF THE SENSITIVE ELEMENT (Fig. 1)
The detectors are suitable for coils made up with an insulated copper wire with a cross-section of at least 1.5 sq. mm. Preferably use
twisted copper wires with at least 20 twists per metre to connect the detector to the coil. Jointing in the coil wires and in the twisted
cable is not recommended. If unavoidable, jointings should be welded and sealed in an appropriate watertight junction box to ensure
best detector operation. If the wires used for the twisted cable are especially long or in proximity to other power cables, shielding of
said wires is recommended. Earthing of the shield should only be made at the extremity of the detector.
Excepting special cases, the detection coils should be rectangular. Install with the longer sides placed at right angles in the direction of
vehicle movement. These sides should ideally be kept at a meter one from the other. Coil length is a function of the width of the road
surface to be monitored. A distance of no more than 300 mm is recommended between the coil and each edge of the road surface. For
coils running over a perimeter of more than ten metres two wire windings are normally employed, while for coils with a lower perimeter
three or more windings are required, and four windings are required for coils with a perimeter below six metres.
In order to reduce the diaphonic effect, adjacent coils should be so laid as to alternate three and four windings.
All permanent coil components must be secured to the road surface in appropriate grooves made using masonry cutting tools or the
like. A cross-cut at a 45° inclination must be made at the circuit angles so as to prevent the risk of the coil cable being damaged in
proximity to the apex of the right angles.
Nominal groove length: 4 mm.
Nominal groove depth: 50 mm.
The coil-detector connection cable must also be laid in an appropriate groove running from one of the circuit angles along the circuit
perimeter to the road surface edge. To ensure wiring continuity between the coil and connection cable allow for a long enough lead to
reach as far as the detector before inserting the cable inside the coil groove. After laying the required number of wire windings in the
groove along the coil perimeter, route the wire towards the road edge through the connection cable groove.
It is advisable that connection cable length not exceed 100 metres. As coil sensitivity diminishes proportionally to connection cable
length the latter should be kept as short as possible.
Coils are secured to road surface by means of a quick-drying compound containing epoxy resin or asphalt mastic applied hot.
In the case of two contiguous coils, keep a minimum distance of at least two metres between each.
Note: The inductive activity and hence the sensitivity of the coil detection system is reduced by the presence of a steel reinforcement
beneath the road surface. Ideally allow for a distance of 150 mm between coil cable and steel reinforcement.
0,3 m
MLX24A
24 – 12 V AC/DC
20 mA st.by – 40 mA max
Impulsive and/or presence
N.O./N.C. relay output - impulsive (100 ms.)
N.O./N.C. relay output - impulsive (100 ms) or presence
88 x 76 x 38 mm // 85 g
max. 1 m
5 m
(recommended)
0,3 m
ENGLISH
MLX220A
230 VAC
13 mA st.by – 40 mA max
1
2
0,5 A @ 24 V
Red LED
-20/+55 °C
88 x 76 x 38 mm // 100 g
10 ÷ 15 mm
ISMLXEUA_05_05
Fig 1
30
÷
50
mm