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TWO-LOOP SELF CALIBRATINg METALLIC MASS DETECTOR
REMARKS
These instructions are aimed at professionally qualified "installers of electrical equipment"
and must respect the local standards and regulations in force.
Description
This device is suitable for detecting the presence of metallic masses in a magnetic field
generated by a special external circuit (sensitive element) connected to it.
The system is made up of four parts:
MWZ024E
1) An
detection device contained in a special protective case.
DIN46277
2) Socket for fitting on panelling or
3) Sensitive elements (not supplied by us) that should be made up of a multi-polar cable with
one or more wires and must respect the measurements as specified in the drawings.
4) A bipolar cable (not supplied by us) with which to connect the sensitive element to
the detecting device. If you use two single wire cables these should be loosely wound
together.
use
The MWZ DETECTOR is best used in the following fields:
-
The automatic opening of gates and doors where there is intense traffic (for blocks of
flats, office buildings and industry etc.).
-
The control of vehicles in pay car parks.
-
Near automatic traffic light installations.
-
Detection, in predetermined places, of the presence of metallic masses in general.
Technical data:
-
power supply
-
max. power consumption with 2 activated relays
-
maximum commutable power at the relay:
load dc
load ac
maximum voltage
-
Protection grade
Making the sensitive element
Loop type and dimensions:
- Loops with an inductive value of between 50µH and 380µH can be used but the ideal
value is about 250µH.
- The form of the loop is usually rectangular with the long side stretching between 2 and 6
metres and the short side between 50 and 80 cm. The loop however can be any shape
as long as you stay within the induction values. Remember that changing the shape and
the number of loops in the loop will effect the sensitivity of the device and consequently
its ability to detect the presence of metal. It is the installer's responsibility to test the
effectiveness of the loop before completing the installation.
- It is possible to use single wire cables with a 1,5 mm diameter as well as multiple wire
interconnected cables.
- The length of the connection between the loop and the MWZ control device must not
exceed 10 m (the cable must however be wound at least 20 times per metre).
List of possible loop configurations using 1,5 mm single wire cable
1. Rectangular loop: Length = 2m; Width = 80cm; 6 cable loops.
2. Rectangular loop: Length = 3m; Width = 80cm; 6 cable loops.
3. Rectangular loop: Length = 4m; Width = 80cm; 5 cable loops.
4. Rectangular loop: Length = 6m; Width = 80cm; 4 cable loops.
List of possible loop configurations using multiple wire cables
1. Rectangular loop: Length = 2m; Width = 50cm; 4-wire cable with an overall length of 20
m.
2. Rectangular loop: Length = 4m; Width = 50cm; 3-wire cable with an overall length of 27
m.
3. Rectangular loop: Length = 6m; Width = 50cm; 2-wire cable with an overall length of 26
m.
Installation
(fig.3-4-5)
- Dig a rectangular shaped excavation in the area which is to be controlled by the sensitive
element.
Note: The excavation must not be deeper than 100 mm.
- If necessary protect the sensitive element with a special plastic sheath which is suitable
for laying underground.
- Place the sensitive element into the excavation making sure that it lies correctly and that
there are no sharp edges or protrusions that could damage it.
- Connect the two ends of the loop to the appropriate binding posts (LINK) using a bipolar
cable no longer than 5 m.
The connection should be as short as possible in order to optimize the operation of the
system.
- Lay the loop underground and embed it in cement to ensure a stable position and to
prevent it from moving after setting.
Adjust the sensor setting and place it in the required position.
Function modes (6 programs)
Attention!
For a single loop installation disconnect loop 2 from its binding post (SP2).
Program 1
Single loop function. When a metallic mass is detected relay 1 (which remains active while
there is presence) and relay 2 (which gives a one-second impulsive signal) are activated
simultaneously.
Note: If a metallic mass is already present and another object passes over the loop the second
relay will not be activated again.
Dip switch 1: ON
Dip switch 2: ON
Dip switch 3: ON
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rails
Vac/dc
mA
W
VA
Vac/dc
IP
(fig.2)
SERIAL NUMBER
L373.00
This product has been tried and tested in the manufacturer's
laboratory, during the installation of the product follow the sup-
plied indications carefully.
Program 2
Single loop function. When a metallic mass is detected relay 1 (which remains active
while there is presence) is activated. Relay 2 gives a one-second impulsive signal when
the mass leaves the loop detection area. .
Dip switch 1: OFF
Dip switch 2: ON
Dip switch 3: ON
Program 3
Double loop function. The two loops are managed separately with relay 1 activating
when a metallic mass is detected by loop 1 and relay 2 activating when a metallic mass
is detected by loop 2.
Dip switch 1: ON
Dip switch 2: OFF
Dip switch 3: ON
Program 4
Double loop function (detecting the passage of traffic in both directions) Relay 1
activates if a metallic mass is detected by either of the loops (continuous function).
Relay 2 gives an impulsive signal when a metallic mass passes from one loop to the
other as follows:
Passing from loop 1 to loop 2: the relay activates for 1 second (a car for example passes
over loop 1 and then passes over loop 2).
Passing from loop 2 to loop 1: the relay activates for 2 seconds (a car for example passes
over loop 2 and then passes over loop 1).
Note:
24
- relay 1 will not deactivate when the car leaves the detection area of loop 2 if another
50
car moves over the area of loop number 1
- the reverse function is not possible (a car for example passes over loop 1 then reverses)
24
as relay 1 will not deactivate until the metallic mass has also passed over loop 2. This
60
avoids deactivation when a car finds itself in between both loops.
42.4
Dip switch 1: OFF
40
Dip switch 2: OFF
Dip switch 3: ON
Program 5
Double loop function (detecting the passage of traffic in one direction) Has the same
function as program 4 except that the function only allows passage from loop 1 to loop
2 and the impulsive relay is not activated.
Dip switch 1: ON
Dip switch 2: ON
Dip switch 3: OFF
Program 6
Double loop function (both loops work together as a single loop).
When a metallic mass is detected by either or both loops relay 1 is activated. The relay
is only deactivated when both loops are free.
Dip switch 1: OFF
Dip switch 2: ON
Dip switch 3: OFF
Note:
Dip-switch configurations different to the above are not possible and will lead
to an error signal when the device is activated.
Loop sensitivity
Dip-switch 4 : ON = High sensitivity loop 2
Dip-switch 4 : OFF = Low sensitivity loop 2
Dip-switch 5 : ON = High sensitivity loop 1
Dip-switch 5 : OFF = Low sensitivity loop 1
Note:
If you are using a double loop you are advised to have two loops with the same
sensitivity in order to avoid detection errors by the loop with lowest sensitivity.
Program
1
2
3
4
5
6
Din socket connections (fig.6)
1-2
Power supply (see the indications on the terminal board)
3-4
Impulsive output, relay "R2" common/normally open
5-6-10
Continuous output, relay "R1" normally open/common/normally closed The
metallic mass will be monitored for the entire time in which it effects the
loop.
7-8
Inductive loop bipolar cable input "SP1" (LINK).
9-11
Inductive loop bipolar cable input "SP2" (LINK).
Trouble shooting
The leds on the device give important indications regarding problems which can occur
during the installation or during normal operation.
- The red power led "L3" doesn't light up. The device is not receiving power.
- The green led "L1" indicates the single loop or double loop function. Fixed for single
loop operation and flashing for double loop operation.
- The green led "L2", during normal operation, lights up from time to time indicating
self-calibration.
- If led "L1" is off, led "L2" indicates the following states:
1) Led "L2" is off meaning there is a microprocessor problem and the program is not
running.
2) Led "L2" is constantly on meaning that no loops have been connected to the device,
the inductance values of the loops is out of range or the loop is in short circuit.
3) Led "L2" is on and is flashing meaning that a program that is incompatible with the
number of loops has been chosen (e.g. you have a single loop and have chosen
program 4)
SERIES
MODEL
MWZ
024E
DIP 1
DIP 2
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
DATE
10-2000
DIP 3
ON
ON
ON
ON
OFF
OFF
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