Micro Detectors FC4 Installation Manual

FC4
FOUR BEAMS FORK SENSOR
FOR BELT TRACKING
CONTROL
Installation manual - 826004760 Rev. A - ENG - Created: 25/01/2023

GENERAL DESCRIPTION

The FC4 belt tracking device consists of a fork type frame with four photocells. The device is
specially designed for use in belt tracking control with belt sanding machines. The use of two light
beams (O and O ) gives the device a rated mechanical-optical hysteresis of 7 mm irrespective of
1 2
the colour of the sanding belt. This level of hysteresis reduces the frequency of signal switching
due to uneven belt edges.
The device provides two complementary PNP or NPN type belt tracking outputs (outputs O
O ) capable of controlling DC loads rated at 200 mA/24 V (5 W). These outputs are protected
NO
against short circuit and overload by a self-resetting protection circuit. The logic for the O
is DARK ON (i.e. signal ON when the light beam is obstructed).
Two alarm functions are provided for limit tracking conditions detected by two additional light
beams A and A located at a distance of 20 mm from O and O respectively. The innermost alarm
1 2 1 2
light beam is positioned at 70 mm from the fork body (for further details see FIG. 1).
Either of the alarm conditions caused by A becoming obscured or A reading light deactivate
2 1
output A. This output consists of a 1 A, 24 V NO relay contact that is forced closed under normal
conditions. If power fails or an alarm condition occurs, the contact automatically reopens.
The belt tracking alarm condition is not held, but the device's response times allow the contact to
remain open for at least 500 ms. This is plenty of time to safely deactivate any relays controlled by
this contact.
To verify the efficiency of the relay, check that the contact remains open during device START-UP
time (0.7 s). There is no external manual adjustment for sensitivity. Sensor status is shown by
3 + 2 LEDs. See TABLE 3 and TABLE 7.
A self-test is run every time the device is powered on, and is completed within the START-UP time.
In practice, this self-test is only useful under machine set-up or repair conditions, since all the
photocells have to be free for the test to complete successfully.
At the end of device START-UP time, a self-test failure is shown by the red LED coming on (the
device's other signals and functionalities are not affected). This LED flashes rapidly until the status
of one of the photocells changes. This makes it easy for maintenance personnel to ascertain the
status of the device. Obviously, if the red LED is showing a self-test fail, it cannot also show the
status of the alarm A output contacts.
Under normal conditions, the belt is in place when the device is powered on and therefore at least
one photocell is obscured. Under such conditions the self-test gives no significant signal and the
red self-test fail LED will always come on momentarily.

Installation

Use the two Ø 5.5 mm holes and M5 screws to fix the fork sensor in place. If the device is installed
in applications with a high level of vibration, the fork arms should also be secured. To avoid damage
to sensitive components, the device should be protected against machine malfunctions by a
metallic shield.
FIG.1
TABLE 1 – MODELS
Article code
FC4/V-00 Two pig-tail, male M12 connectors, 4 pins, cable length 600 mm. PNP output.
FC4/A-00 Two co-axial cables, 4 pins, cable length 2000 mm. PNP output.
FC4/V-01 Two pig-tail, male M12 connectors, 4 pins, cable length 600 mm. NPN output.
FC4/A-01 Two co-axial cables, 4 pins, cable length 2000 mm. NPN output.
TABLE 2 – LIGHT BEAMS
Light beam
A
1
and
O
Outer oscillation limit
NC
1
output O
Inner oscillation limit
NO
2
A
2
TABLE 3 – LED INDICATORS
LED Colour Status
OFF No external or internal power.
ON con with short OFF
Device powered on and device active.
L1 Green T=3s
Device powered on but control system
ON
PNP (or NPN) O
PNP (or NPN) O
OFF
L2 Yellow
PNP (or NPN) O
PNP (or NPN) O
ON
Alarm relay energised, alarm not active.
OFF
Output A contacts (a1, a2) closed.
Alarm relay not energised, alarm active.
ON
Output A contacts (a1, a2) open.
L3 Red
Signal only occurs on Power_ON.
Indicates that power-on self-test has failed.
Flashing 3Hz No relevance to alarm relay status.
Assumes state 6 or 7 on first change
LED at end of right arm, repeats L2
L4 Yellow See L2
LED at end of left arm, repeats L3
L5 Red See L3
TABLE 4 – J1 CONNECTIONS
Connector J1
Pin Colour Function
1 Brown 24 Vdc power input
2 Yellow Belt tracking output O
NC
3 Blue 0 Vdc power input
4 Black Belt tracking output O
NO
TABLE 5 – J2 CONNECTIONS
Connector J2
Pin Colour Function
1 Brown
Not connected
2 Yellow
Alarm output A
3 Blue
Not connected
4 Black
Alarm output A
TABLE 6 – TECHNICAL SPECIFICATIONS
Description
Light beam diameter (maximum obstacle diameter)
Description
Outer alarm limit
Inner alarm limit
Ouputs O
Description Ref.
1
2
3
malfunction.
output open.
NO
output closed.
4
NC
Previous status:
beams O and O free
1 2
Maximum output switching frequency
output closed.
NO
output open.
5
NC
Previous status:
beams O and O obstructed
1 2
6
7 Shock resistance IEC 60068-2-27 (2008)
Vibration resistance IEC 60068-2-6 (2007)
8
in beam status.
9
signals.
10
signals.
(1) Dark state detection, valid for all beams individually.
(2) We recommend use of an external power supply to compensate for transient mains failures of up to 20 ms according to EN 60204.
(3) We recommend use an external power supply with max. 1 A short circuit protection.
Must not exceed the max. or min. limits of the operating voltage range.
(4)
(5) Excluding loads; valid for entire power supply voltage range.
Description (6) Minimum load: 10m VDC, 0.01 mA. Mechanical life: 50x10
Duration of two read cycles with integration.
(7)
(8) Scan interval between beams is 200 μs.
Power supply and common positive for loads
(9) Time taken, after power on, for outputs to switch from OFF to the state corresponding to the beam state.
PNP or NPN NC output with short circuit protection
TABLE 7 – DESCRIPTION OF FUNCTIONS
Power and output return
EVENT
PNP or NPN NO output with short circuit protection
1
2
3
Description
Can be used as input.
4
Pin a1 of alarm output contact
Can be used as input.
5
Pin a2 of alarm output contact
6
7
Declaration of conformity
Datasensing S.r.l. declares under our sole responsibility that these products are in conformity
with the EMC directive.
PARAMETERS Minimum
Sensitivity
1)
Wavelength
Beams aperture angle
Oscillation hysteresis
Optical power class
Immunity to ambient light
Power supply voltage
2) 3) 10V
DC
Residual ripple
4)
Current draw 5) 30mA
Output A (alarm)
6) Electromechanical contact, 1 A, 30V
and O (belt tracking control) Two complementary PNP (or NPN) outputs. Class DC13 (inductive load protection). Short circuit and overload protection.
NC NO
Output current
Short circuit protection threshold
Voltage drop
Leakage current
Maximum capacitive load
Sampling duration
7)
Scan duration of the four beams
8)
Output O and O response times
NC NC
70Hz with 1/2 dark/light
Output A contact response time
Time delay before availability 9)
VDE protection class
Index of protection
3axes x6, Half sine, P. acc.: 30gn, Dur.: 11ms
Freq.: 10...55Hz, Amp.: 0,5mm, Sweep: 5min. fr: 3x30min.
Electromagnetic compatibility
Conforms to the requirements of EMC directive according to EN 60947-5-2
Operating temperature range
Storage temperature range
Relative humidity (non-condensing)
Weight 200g
Connections 4 pins, see TABLE 1, models, TABLE 4 and TABLE 5
Case material
Cable material
6 oper. min. (at 3 Hz). Electrical life: 100 x 10 3 oper. min. at 1 A 3 0VDC (at 0.5 Hz)
FUNCTION DESCRIPTION
Power_ON On power on, outputs O and O remain open and alarm output A also remains open for the duration of the "time delay before availability".
NO NC
A self-test is performed during the "time delay before availability". This test terminates successfully if all the beams are free.
Self-test The green LED lights and goes off briefly in 3 s cycles to signal the correct functioning of the device. This corresponds to a watchdog function.
The green LED repeats this cycle for as long as the device is powered on. A fixed on green LED indicates a malfunction or power failure.
At the end of the "time delay before availability", if beams O and O are not both obscured, output O
1 2
End of a complementary manner. This state is maintained until event 4 or 5. If the self-test has failed, the red LED momentarily flashes in a 1/3 s cycle. This condition is
Power_ON completely independent of the state of the alarm output and only persists until one of the beams changes state. The alarm output assumes the state determined by
the states of beams A
Activation
of
If both O and O are obscured, output O is closed, and the yellow LED is on. Output O
output O 1 2 NO
This state is maintained until event 5.
(O = / O NO )
NC NO
Deactivation of
output O If both O and O are free, output O is open and the yellow LED is off. Output O
NO 1 2 NO
(O = / O )
NC NO
Activation This is the belt too far out alarm. If beam A is free, alarm output A is open. The activation response time for this state is ≤ 8 ms. The red LED is fixed on.
1
of A alarm The response time for exiting this state is 500 ms (open state persists for at least 500 ms).
OUT
Activation
This is the belt too far in alarm. if A is obscured, alarm output A is open. The activation response time for this state is ≤ 8 ms. The red LED is fixed on.
of A alarm 2
The response time for exiting this state is 500ms (open state persists for at least 500ms).
IN
Datasensing S.r.l.
Strada S. Caterina 235 - 41122 Modena - Italy
Tel. +39 059 420411 - Fax +39 059 253973 -
www.datasensing.com
Typical Maximum
1 sheet of 80 g/m2
white paper
880nm
3mm
± 15°
7mm
1 (no danger)
10,000 lux, artificial light
24V 30V
DC DC
≤5Vpp
70mA
, no short circuit protection.
DC
200mA 300mA
430mA @ 25°C
2.5V@100mA
≤ 10 μA
5μF
4ms
600μs
4.7ms
100Hz with 1/1 dark/light
8ms (open); 500ms (close)
700ms
III (max. voltage 50VAC), 500V insulation
IP67
–20 °C ...+55 °C
–40 °C ...+75 °C
15 %
95 %
PC
PVC
is open and the yellow LED is off. Output O behaves in
NO NC
and A (see events 6 and 7).
1 2
behaves in a complementary manner.
NC
behaves in a complementary manner. This state is maintained until event 4.
NC