Advertisement
signal low).
L300-Bx-xxxM23B19
3 command devices
2 command devices
A2
19
6
B2
17
19
I4
1
O3
8
O4
9
6
I3
15
7
6
6
2
14
3
13
11
12
4
10
18
5
16
19
4.11 RFID sensor switching points
The RFID sensor on the device recognizes the actuator when placed in front of it.
Within this fi eld, the O3 signal output and the ACT LED are activated to signal the
"protective device closed" state. In this state, it is possible to obtain protective device
locking via the I4 (or IE1/IE2) input. After the locking operation, the LOCK LED and
the O4 output are activated; at the same time the RFID sensor increases its switching
distance, so as to ensure that no vibrations or impacts occurring with the protective
device locked may cause the OS1, OS2 and O4 outputs to open accidentally. If the I4
input (or IE1/IE2) is activated or deactivated, without the actuator being present, the
device does not carry out any locking and does not activate any of the OS1, OS2, or
O4 outputs. In order to open the protection, I4 input (or IE1/IE2) must be used; with
the protection released, the O4 output will be deactivated and the LOCK LED will be
switched off. At this point, the RFID sensor will bring its intervention distance back to
the initial values and, after the protective device has been opened, the O3 output and
the ACT LED will be deactivated.
5 OPERATION
5.1 Access monitoring
These safety devices alone are not suffi cient to protect any operators or maintenance
engineers in the event of fully entering the danger zone, since any unintentional clos-
ing of a safety door behind them could allow the machine to be restarted. In case the
machine restarting control is entirely entrusted to these switches, a device must be
provided to avoid that risk, such as a lock-out/tag-out system which stops the machine
from being restarted. A specifi cally designed lock-out/tag-out device is available as
an accessory for this safety switch, which prevents any unintentional machine start
up with the operator still inside (AC-L300-SH-LCK1-A3-P safety door handle; part
number 50133287).
5.2 Defi nitions
Switch operating states:
• OFF: the device is off, not powered.
• POWER ON: status immediately following switching on, when the device carries
out internal tests.
• RUN: status in which the device works normally.
• ERROR: error status in which the safety outputs are deactivated. Indicates that a
fault is present inside or outside the device, such as:
- short circuit between safety outputs (OS1 and OS2),
- short circuit between a safety output and ground,
- short circuit between a safety output and the supply voltage,
- excessive misalignment between a switch and a locked actuator,
- excess of maximum holding force with failure of the relating device in locked
condition,
- excess of maximum or minimum ambient temperature admitted,
- internal error.
1 command device
A2
A2
19
1
6
19
B2
B2
17
19
19
I4
I4
1
1
O3
O3
8
8
O4
O4
9
6
9
I3
I3
15
7
7
6
6
6
6
2
2
3
3
12
12
4
4
18
5
5
16
19
• The safety functions are defi ned as follows.
Mode 1:
1.1 The OS safety outputs must be deactivated when the actuator is
detected as unlocked.
1.2 The OS safety outputs must be deactivated when the actuator is
no longer detected.
6
17
1.3 The OS safety outputs must be deactivated when at least one
safety input (IS1 or IS2) is not active.
Mode 2:
2.1 The OS safety outputs must be deactivated when the actuator is
no longer detected.
2.2 The OS safety outputs must be deactivated when at least one
safety input (IS1 or IS2) is not active.
Mode 3:
3.1 The OS1 safety output must be deactivated when the actuator is
detected as unlocked.
3.2 The OS2 safety output must be deactivated when the actuator is
no longer detected.
18
3.3 The OS1 safety output must be deactivated when the IS1 safety
input is not active.
3.4 The OS2 safety output must be deactivated when the IS2 safety
19
input is not active.
In all operating modes, the device must keep the protective device closed and locked
when the electromagnet is active (MLM24 operating principle) or inactive (SLM24
operating principle) and the applied force is lower than the declared FZh value.
• External Device Monitoring (EDM) is a function (available depending on the device
model) that allows the device to monitor the state of external contactors. Activation
and deactivation of external contactors must follow the state of the L300 switch
safety outputs within a maximum delay.
5.3 Operation description
Note: The following operation description refers to a device with safety outputs active
when the protection is closed and locked (mode 1).
A device with safety outputs activated by closing the protective device (mode 2) differs
from the above operating mode for the fact that the safety outputs OS1 and OS2 are
activated without the f4 function verifying the protective device locking.
Mode 3 differs, in that OS1 is activated when the protective device is closed and
locked, and OS2 with protective device closed.
After being correctly installed by following the present instructions, the safety device
can be supplied with power. The block diagram below shows 5 logically linked
sub-functions of the safety device.
f2
EDM
f5
I5
f4
IN
f1
IS1
IS2
f0
PWR
A1
A2
IS2 inputs, while at the same time function f2 checks that the actuator is present, and
function f4 checks that the actuator has been locked.
In the EDM versions the f5 function verifi es the coherence of the EDM signal during
operating state changes and when the safety outputs are off.
When these three conditions occur, function f3 of the device activates the OS1 and
OS2 safety outputs.
The IS1 and IS2 inputs of the device are usually actuated simultaneously and there-
fore they are monitored, in terms of their state and their coherence. The device deac-
tivates the safety outputs and signals the state of non-coherent inputs by means of
IN LED green/orange fl ashing, in the case where only one of the two inputs is deacti-
vated. In order to reactivate the safety outputs, both inputs have to be deactivated and
subsequently reactivated.
During the RUN state, function f0 cyclically carries out internal tests in order to detect
any faults. Any internal error being detected brings the device to the "ERROR" state
(PWR LED with red fi xed light), which immediately deactivates the safety outputs.
The "ERROR" state can be reached even in the case of short circuits occurring
between the safety outputs (OS1 and OS2) or a short circuit of an output towards
earth or towards the power supply. Also in this case, function f3 deactivates the safety
outputs, and the error status is indicated by the OUT LED red fl ashing light.
The O3 signal output is activated during the "RUN" state when the actuator is inserted
in the device, regardless of the state of the IS1and IS2 inputs. The state of this output
is displayed by means of the ACT LED.
The O4 signal output is activated during the "RUN" state when the actuator has been
inserted and locked inside the device, regardless of the state of the IS1and IS2 inputs.
The state of this output is displayed by means of the LOCK LED.
The actuator lock or unlock command is transmitted to the device through the I4 input.
I3 input has different functions, depending on the state of the L300:
- Actuator inserted but not locked: I3 activates the "Teaching an actuator" function
(see section 5.4).
- L300 in error state: I3 activates the reset function (see section 5.5)
- Actuator inserted and locked: I3 without function.
5.4 Actuator replacement
Attention: The machine manufacturer must restrict access to the sensor pro-
gramming mode to authorized personnel only.
4
In the initial "POWER ON" status, function f0 of the
safety device carries out an internal self-diagnosis
which, if successfully completed, brings the device to
CODE
the "RUN" operating state. If the test is not passed
ACT
due to an internal fault, the device enters the
O3
"ERROR" status.
LOCK
On EDM versions, at power on, the EDM signal is
O4
checked and it must be active within 500 ms from
device startup. If the EDM signal is not present after
OUT
this time span has elapsed, function f5 puts the
f3
OS1
device in the "FAULT" operating state.
OS2
The "RUN" operating state indicates normal opera-
tion: Function f1 evaluates the state of the IS1 and
Advertisement
