Reer ARGOLUX AU S3M2 Guide de démarrage rapide
ARGOLUX AU S3M2
CONTROL UNIT
WITH INTEGRATED MUTING FUNCTION
INSTALLATION, USE AND MAINTENANCEINSTALLATION, USE AND MAINTENANCE
INDEXINDEX
OVERVIEW ...........................................................................................................4
APPLICATIONS.............................................................................................4
CONTROL UNIT THEORY OF OPERATION AND STATES.................................5
AU S3M2 FUNCTIONING DIAGRAMS.........................................................11
CONTACT STATUS .....................................................................................13
LED STATUS INDICATIONS.........................................................................14
TECHNICAL DATA .............................................................................................. 15
DIMENSIONS .....................................................................................................16
INSTALLATION ...................................................................................................16
POSITIONING............................................................................................ 17
ELECTRICAL CONNECTIONS......................................................................22
CHECKS AND MAINTENANCE.................................................................... 29
MALFUNCTIONS........................................................................................ 29
IDENTIFICATION LABEL ......................................................................................31
WARRANTY ........................................................................................................31
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3
The informations and the remarks given in this instruction manualThe informations and the remarks given in this instruction manual
may be subject to change due to further development of themay be subject to change due to further development of the
Argolux AS System.Argolux AS System.
Since the knowledge of this manual is fundamental for theSince the knowledge of this manual is fundamental for the
appropriate fitting and use, always refer the one included in theappropriate fitting and use, always refer the one included in the
shipping box of the product.shipping box of the product.
4
OVERVIEW
The AU S3M2 control unit is a complete system for control of type 2
electro-sensitive safety equipment (ESPE) in compliance with the European
standard prEN 50100 project for accident prevention on hazardous
machines and plants.
When correctly connected to a safety barrier or to a safety device that
performs the sensing function, the AU S3M2 control unit checks safe
functioning of the sensing device by sending a test signal and assessing its
reply time.
With its integrated intrinsic safety circuit, the AU S3M2 control unit is able
to detect any hardware faults in its internal circuits and also checks correct
functioning of its own output circuit consisting of two guided contact safety
relays.
Correct functioning of external auxiliary relays or contact blocks is also
checked at each test cycle, with also permanent automatic monitoring of
the muting and override function circuits.
If a system malfunction is detected, the AU S3M2 unit promptly de-
energizes its output circuit and switches to fail condition.
Control unit status is output continuously by leds while the self-test output
permits remote management of information regarding correct functioning
of the device.
APPLICATIONSAPPLICATIONS
The AU S3M2 control unit (combined with Argolux AS series light barriers)
can be used effectively in all sectors of industrial automation requiring
control and protection of access points to danger areas.
The device, with its own internal circuit able to assure safe management
of the muting function, is particularly suited for protection of access points
to the load and unload areas of:
•automatic palletizing/depalletizing systems;
•materials handling and storage systems;
•packaging and wrapping machines;
•assembly lines;
•industrial automatic warehouses.
When combined with an Argolux AS light barrier and connected to
specific muting sensors that complete the system for this type of
application, the AU S3M2 control unit provides an efficient solution to the
problem of man/material discrimination at dangerous access points
characterized by transit of pallets.
5
CONTROL UNIT THEORY OF OPERATION AND STATESCONTROL UNIT THEORY OF OPERATION AND STATES
Test function.Test function.
A type 2 safety system maintains its protective function by checking correct
response to an external test command. The system must stop if the test
detects a fault that could impair safety.
At power-on or each time the light barrier is interrupted, if the area
controlled is free, the AU S3M2 unit switches to clear status with output
relays A and B de-energized. The test contact must be closed in order to
enable the next work cycle.
FThe test command must precede the start command of theThe test command must precede the start command of the
machine that initiates the next work cycle.machine that initiates the next work cycle.
FThe output relays of the AU S3M2 control unit are energizedThe output relays of the AU S3M2 control unit are energized
only if the test is positive.only if the test is positive.
The test function is always enabled at any point of the machine cycle
provided the light barrier is free. This means that correct system
functioning can be checked at any time without necessarily occupying the
protected area.
The first part of the test checks correct functioning of the light barrier.
Occupation of the sensitive area is simulated in this phase, checking the
response time and correct functioning of the output circuit.
Subsequently, the AU S3M2 checks the response time of its own output
circuit consisting of two guided contact safety relays.two guided contact safety relays.
The output chain is kept open during the entire test phase and this
condition is maintained also during checks on the response times of
internal relays A and B which are energized and checked in two separate
phases.
If the test is positive, the control unit causes energization of its output
relays A and B and, using a feedback circuit, checks the switching times of
any external auxiliary relays or contact blocks (K1 and K2). If this test is
also positive, the control unit switches to guard statusguard status and enables the
next operating machine start command.
If no fault is detected, guard status is maintained until the area controlled
by the light barrier is intercepted.
Occupation of the area controlled causes immediate drop-out of output
relays A and B and the control unit switches to break status.break status. The test
command is not operative in this condition and the area controlled must
be freed in order to carry out a new test cycle.
If a test fails, the control unit switches to fail statusfail status preventing energizing
of the output relays.
This error condition, characterized by blocking of the unit with the output
relays de-energized, is also sent towards the outside through switching of
the self-diagnosis output on the unit.
6
Muting function.Muting function.
The muting function (temporary bypassing of the light barrier) is
indispensable when transit of material to the danger area through the
access protected by the light barrier must not cause stoppage of the
machine and consequent restart preceded by the test command.
According to safety regulations, the muting function can be activated only
if two signals are present, at least one of which must be of the hardware
type, i.e. coming from a field sensor.
An additional sensing system (muting sensors)(muting sensors) is therefore required which,
if configured correctly, provides the control unit with information (muting(muting
signals)signals) regarding transit of the material "authorized" to access the
danger area.
The control unit activates and de-activates the muting function only with
the correct muting sequence, characterized by a specific signal timing, at
its inputs.
During the period in which the function is active, the AU S3M2 control
unit is in muting status and, although it detects occupation of the light
barrier, does not generate the signal which, in any other condition, would
cause stopping of the machine. The presence of material at the access
point controlled must prevent operator access to the danger area.
As contemplated by safety regulations, muting status is indicated externally
by an indicator light located close to the dangerous access point. The AU
S3M2 control unit is complete with an output for connection of this light
and is able to check that this is present and working correctly.
When the control unit receives an incorrect muting sequence, to be
ascribed for example to a sensor or light barrier malfunction, or if it
detects a malfunction of the muting indicator device, it promptly de-
energizes its internal relays A and B and switches to fail muting statusfail muting status,
indicated by a specific light.
The AU S3M2 control unit manages the muting function using 2 or 3
inputs to which sensors with relay output or sensors with PNP static type
output can be connected (table 1, page 6). In particular, switching must
be of the DARK ONDARK ON type.
To activate the muting function, the material that passes through the
dangerous access point must be detected by both sensor 1 and sensor 2.
After detecting a change of state of a sensor, if the other sensor changes
state within 4 seconds,within 4 seconds, the control unit activates the muting function.
The control unit de-activates the muting function as soon as one of the
sensors is cleared. Muting sensors 1 and 2 must therefore be constantlyconstantly
engaged by the material during the entire period in which the muting
function is to remain active because the light barrier is occupied by the
material.
7
Relay output
N.A. contact PNP static output Output voltage
Material sensed
(Beam occupied)
ON HIGH
Material not sensed
(Raggio libero)
OFF LOW
Table 1
Muting sensors output.
Using photoelectric sensors, this condition is assured using the crossed
beam technique. An example in which two photoelectric reflex switches
are used as muting sensors is shown in figure 1 below.
Figure 1
Positioning of the safety barrier and of the muting sensors.
For correct functioning of the system:
FThe material must obscure the two muting beams at the sameThe material must obscure the two muting beams at the same
time (within 4 seconds) before intercepting the light barrier;time (within 4 seconds) before intercepting the light barrier;
FAn operator must NOT obscure the two muting beams at theAn operator must NOT obscure the two muting beams at the
same time (within 4 seconds) before intercepting the lightsame time (within 4 seconds) before intercepting the light
barrier.barrier.
These conditions are guaranteed only in the case of correct reciprocal
positioning of the sensors and light barrier, taking into account the
dimensions and feed speed of the pallet and the response times of the
sensing devices (fig. 2, page 7).
8
Figure 2
Positioning of the muting sensors.
FThe position at which the two muting beams intercept eachThe position at which the two muting beams intercept each
other must be beyond the barrier in the danger area.other must be beyond the barrier in the danger area.
To de-activate the muting function and therefore restore guard status, the
AU S3M2 control unit must detect not only switching of at least one sensor
but also previous occupation and freeing of the light barrier.
If one of the sensors (1 or 2) is free but the control unit does not detect
correct switching of the output of the light barrier, it de-energizes relays A
and B and indicates an error in the muting sequence.
A third sensor (sensor 3) can be used to add a further functional check to
the system. In this case, after de-activation of the muting function,
sensor 3 must be freed before re-enabling the muting function (fig. 3).
Therefore, sensor 3 makes it possible to check the distance between two
consecutive pallets. For correct application, refer to the muting sensor
positioning section (page 18).
Figure 3
Sensor 3 and pallet separation.
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In some applications, sensor 3, if correctly positioned, also creates an
additional protective barrier in that if sensor 3 is not engaged correctly,
the control unit causes immediate stopping of the machine (fig. 4).
Figure 4
Positioning of sensor 3 in a typical application.
The muting cycle ends successfully if, once sensor 3 has been freed, all
the elements have switched according to the correct muting sequence.
The configuration of muting sensors 1 and 2 in the case in which
proximity type sensors (capacitive, inductive or photoelectric diffuse
switches) are used is shown in fig. 5 below. To perform the correct muting
sequence, sensors 1 and 2 must be replaced by two pairs of sensors
(1a/1b and 2a/2b).
In this case, the outputs of the single pairs of sensors must still be
connected in parallel.
Figure 5
Use of proximity sensors.
10
Figure 6 shows the correct muting sequence and highlights how the
muting cycle differs according to whether 2 or 3 sensors are used.
Note:Note: The signals represent the voltage logical levels at the inputs of the control unit.
TS1S2TS1S2 is the time between detection of the material in transit by sensor 1 (or 2) and detection by
sensor 2 (or 1 ). If TS1S2 is less than 4 seconds, the AU S3M2 activates muting.
Tp = 300msTp = 300ms is the response time of the control unit on switching of the muting signals. Delay time
introduced by the unit to filter switching bounce-back.
T3T3 is the moment of occupation of sensor 3. Interception may take place when the muting function is
active or after de-activation of this.
Figure 6
Correct muting signal sequence.
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