Handleiding FAAC C850 (pagina 25 van 40) (Engels)

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C850 532015 Rev. A

LOOP 1

LOOP 2

Loop

Perimeter

Nr. of

Windings

less than

3 m

from 3 to

4 m

from 4 to

6 m

from 6 to

12 m

more than

12 m

ENGLISH

11.5.5 SETTING THE INTEGRATED LOOP DETECTOR

The E850 features an integrated metal mass detector for the

induction detection of vehicles.

Specifications:

• Galvanic separation between the detector electronics and

the loop electronics

• automatic system alignment immediately following activation

• continuous resetting of the frequency drifts

• sensitivity independent of loop inductivity

• loop work frequency adjustment

• occupied loop message with LED visualisation

• loop status addressable on OUT 4

Connection:

Connect the detection loops as shown in figure 28:

- Terminals 1 - 2 for LOOP 1 = loop with gate opening function;

- Terminals 3 - 4 for LOOP 2 = loop with closing and/or safety

function.

To enable operation of the connected loops, enter basic

programming level mode and set the parameters

L1 and L2

Y, consistent with the connected loops. If only one loop

is installed, enable only the corresponding parameter.

The loop detector operating status is shown using the display

decimal points when the automated system status is visualised

(parameter

St ).

CALIBRATION

Each time the E850 board is powered, the display shows the

automated system status and the integrated loop detector

performs the auto-calibration of the connected loops. Therefore,

perform an auto-calibration of the E850 for at least 5 seconds.

Calibration is signalled by the two flashing decimal points, as

shown in figure 43.

If one or both magnetic loops are

not installed, the loop detector remains in constant

calibration mode without causing problems to board

operation. Therefore, during visualisation of the

automated system status, one or both decimal points

will flash constantly.

Once calibration is completed, the decimal points represent the

loop statuses:

Decimal point ON = Loop ENGAGED

Decimal point OFF = Loop CLEAR

Decimal point FLASHING = Loop NOT CONNECTED or

CALIBRATING

Fig. 43

ADJUSTING THE SENSITIVITY

By adjusting the sensitivity you determine the variation of

inductivity, for each channel, which a vehicle must cause in order

to activate the corresponding detector output.

Sensitivity is adjusted separately for each channel with the use

of the parameters

S1 and S2 at basic programming level. See

section 11.5.1.

ADJUSTING THE HOLDING TIME

The holding time count starts when the loop is engaged.

When the time has elapsed, if the loop is still occupied, a new

automatic calibration is performed, in which the presence of the

metal mass on the loop no longer determines its engagement.

At the end of the new calibration the loop is considered “clear”.

The holding time can be adjusted using the parameters

h1 and

h2 in advanced programming mode.

See section 11.5.4.

ADJUSTING THE FREQUENCY and NEW BALANCING

The work frequency of each detector channel can be adjusted on

two levels using dip-switches DS1 (see fig.27).

DIP 1 ON = Loop 1 frequency LOW

OFF= Loop 1 frequency HIGH

DIP 2 ON = Loop 2 frequency LOW

OFF= Loop 2 frequency HIGH

When one of the dip-switches is changed, we recommend

performing a new calibration. If two loops are installed, select

different frequencies for each loop.

NOTES FOR MAKING THE LOOPS

The loop must be made at least 15 cm from fixed metal objects,

at least 50 cm from moving metal objects and no more than 5

cm from the surface of the final paving.

Use a standard unipolar cable measuring 1.5 mm² in diameter (if

the cable is laid below ground level directly, it must have double

insulation). Make a preferably square or rectangular loop, by

preparing a cable runner in PVC or by tracing the paving as

shown in figure 44 (corners must be cut at a 45° angle to avoid

cable breaks). Lay the cable using the number of windings shown

in the table. The two ends of the cable must be twisted together

(at least 20 times per metre) from the loop to the detector. Avoid

splicing a cable (if necessary, weld the conductors and seal the

splice using a heat-shrinking sheath) and keep it separate from

the mains power lines.

Fig. 44

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