fg2_en.pdf

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FG2
FG2 TWO-CHANNEL DETECTOR
ENGLISH
1. DIMENSIONS AND ELECTRIC CONNECTIONS
24 VDC
+
-
1
2
3
24 Vdc power supply
2
Loop contact 2
4
5
6
7
1
Loop contact 1
1
Loop 1
8
9
10
2
Loop 2
11
Dimensions in
mm
2. GENERAL INFORMATION
Applications:
•control of barriers, gates and parking systems
Characteristics :
The FG2 magnetic loop detector is a system for inductively detecting vehicles, and has
the following characteristics:
•analysis of 2 loops
•loops and detector galvanically separated
•system sets automatically at power-up
•frequency drifts are continuously updated to prevent environmental influence
•sensitivity control is independent of loops inductance
•relay outputs with free contacts
•output can be selected as N.O. or N.C. with microswitches
•presence or direction identification
•continuous or pulsed signal
•2 frequency levels for both channels
•4 sensitivity levels for each channel
•secured to DIN bar
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3. HOW TO MAKE THE LOOPS
The loops must be constructed at least 15 cm from
fixed metal objects, at least 50 cm from moving
metal objects, and at no more than 5 cm from the
surface of the definitive flooring. Use a normal
single-pole 1.5mm 2 diameter cable (if the cable is
buried directly, it must be double insulated). Make
a loop, preferably square or rectangular, using a
PVC raceway or making a chase in the floor as
shown in the figure at the side (corners should be
cut at 45° to prevent the cable from fracturing).
Lay the cable, with the number of windings
indicated in the table. The two cable ends must
be intertwined (at least 20 times per meter) from
the loop to the detector.
Do not make any joints on the cable (if this is
necessary, solder the conductors and seal the joint
with a heat-shrink sheath) and keep it away from
mains power cables.
8
Loop perimeter
number of
windings
less than 3 m.
6
from 3 to 4 m.
5
from 4 to 6 m.
4
from 6 to 12 m.
3
over 12 m.
2
4. PROGRAMMING
4.1. Sensitivity
Sensitivity is set
to define, for
each channel,
the minimum
frequency vari-
ation that a ve-
hicle must
cause to acti-
vate the detec-
tor output con-
tact. Sensitivity
can be set to 4
different levels by using two DIP microswitches. Microswitches 1 and 2 control channel 1,
whereas microswitches 3 and 4 control channel 2.
Channel 1
Channel 2
SENSITIVITY
DIP
1
2
DIP
3
4
1
LOW
(0,64%
i
f/f)
OFF
OFF
OFF OFF
2 MEDIUM LOW
(0,16%
i
f/f)
ON OFF
ON OFF
3 MEDIUM HIGH
(0,04%
i
f/f)
OFF ON
OFF ON
4
HIGH
(0,01%
i
f/f)
ON ON
ON ON
4.2. Frequency
The operating frequency of the detector can
be selected on two levels with microswitch 5,
jointly for both channels. Moreover, frequency
depends on loop shape, number of windings
and total length of cable. Different frequencies
must be used for detectors commanding adjacent loops.
Frequency
DIP 5
LOW
OFF
HIGH
ON
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4.3. Presence time and Rest
Maximum presence time can be set with microswitch 6.
When presence time elapses, the engaged channel
resets automatically and signals “loop free”. Presence
time of a channel begins when the relevant loop is
engaged. An automatic reset is effected when the
detector is powered up or if the setting of dip 6 is
changed.
PRESENCE
TIME
DIP 6
5 min.
OFF
Continuous
ON
4.4. Presence identification
To identify presence, turn OFF microswitch 7. Under
these conditions Relay 1 operates in “presence” logic
(contact active for as long as the loop is engaged),
whereas the logic of Relay 2 can be selected for either
“presence” or “release pulse”, by programming
microswitch 8. The latter function can be useful for
controlling barrier re-closing.
DIP 7 = OFF
RELAY LOGIC 2
DIP 8
Presence
OFF
Loop 2 release
pulse
ON
4.5. Identifying direction
While microswitch 7 is ON, you can select from
among two directional logics, using dip 8 to select.
The directional pulse (dip 8 = ON) is useful for
counting vehicles, whereas the continuous
directional signal (dip 8 = OFF) can be useful for
controlling a barrier or gate. The directional signal is
generated by the relay of the loop which is
engaged first. The following example shows
operation with direction 1
DIP 7 = ON
DIRECTIONAL LOGIC
DIP 8
Continuous signal
OFF
Directional pulse
ON
R
2, and, therefore, the signal will be generated by relay 1.
TRANSIT
SEQUENCE
DIRECTIONAL PULSE
(DIP 8 = ON)
CONTINUOUS SIGNAL
(DIP 8 = OFF)
1
2
b
1
2
b
1
2
RELAY 1
R Directional pulse
RELE’ 1
R Continuous directional
signal “ON”
b
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TRANSIT
SEQUENCE
DIRECTIONAL PULSE
(DIP 8 = ON)
CONTINUOUS SIGNAL
(DIP 8 = OFF)
b
RELE’ 1
R Continuous directional
signal “MAINTAINED”
1
2
b
RELE’ 1
R Continuous directional
signal “OFF”
1
2
If transit is in the opposite direction, signals will be generated according to the same
logic but by Relay 2.
In this case of faulty transit which involves reversing, signals will be managed as follows:
TRANSIT
SEQUENCE
DIRECTIONAL PULSE
(DIP 8 = ON)
CONTINUOUS SIGNAL
(DIP 8 = OFF)
1
2
b
1
2
b
1
2
RELAY 1
R Directional pulse
RELE’ 1
R Continuous directional
signal “ON”
b
1
2
RELE’ 1
RContinuous directional
signal “OFF”
b
RELE’ 2
R Directional pulse
signalling that the ve-
hicle is reversing
1
2
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4.6. Reset
At power-up, the detector automatically self-sets the frequency on the loops; if power is
cut for less than 0.3 s, self-setting is not effected. Self-setting can be commanded manually
at any time by pressing the Reset push-button on the detector front panel. About 1 second
is necessary for self-setting, if loop frequency is stable. If the loop is engaged during
self-setting, more time may be required. Very long times mean the frequency is unstable
– we advise you to check the state of the loop/detector system.
5. OUTPUTS AND LEDs
5.1. Functional criterion of re-
lays
The detector is supplied with a
free contacts relay for each out-
put. You can select – separately
for each channel – if you want
the relay to operate on “rest cur-
rent” (coil normally powered
and N.O. contact) or on “oper-
ating current” (coil normally not
powered and N.C. contact).
MICROSWITCH
POSITION FUNCTIONAL CRITERION
1
2
Rest current criterion
(the relay coil de-
energises when the
loop is engaged).
1
2
Operating current
criterion (the relay
coil energises when
the loop is engaged).
5.2. Relay contacts
The table at the side shows the state of
the relay contacts in relation to the
position of the microswitches which
select the functional criterion (see
chapter 5.1).
If the detector is used to control
re-closing of a 620-640 barrier, it is
preferable to use the “rest current
criterion”, because, in the event of a
fault or power failure, this function
prevents the barrier from re-closing, thus
avoiding dangerous situations.
Detector status
Loop free
Loop engaged
Loop fault
Reset
Power off
5.3. Loop fault
If a loop is faulty, the relay of the affected channel switches to “loop engaged” status. If
the fault is solved or removed, the detector operates normally again but the LEDs signal
on which loop the temporary fault occurred. To eliminate fault signalling, press the Reset
push-button.
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