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5 OPERATION
5.1 Access monitoring
These devices alone are not sufficient to protect any operators or maintenance en-
gineers in the event that they are able to physically enter the danger area with their
whole body, since any unintentional closing of a guard 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 specifically designed
lock-out/tag-out device is available as an accessory for the switch, which prevents any
unintentional machine start up with the operator still inside. Please contact our sales
offices for more information (see paragraph SUPPORT).
5.2 Definitions
Device states:
- OFF: device is off, not powered.
- POWER ON: state immediately following switch on, during which the device carries
out internal tests.
- RUN: state in which the device is working in normal operation.
- ERROR: error state in which the safety outputs are disabled. Indicates presence of
a failure, either internal or external to the device, such as for example:
- a short circuit or overload of safety outputs (OS1, OS2),
- a short circuit between a safety output and the ground,
- a short circuit between a safety output and the supply voltage,
- an excessive misalignment between the device and the locked actuator,
- an exceedance of the maximum retention force with failure of the device in locked
condition,
- an exceedance of the maximum or minimum admissible ambient temperature,
- an exceedance of the maximum admissible voltage,
- an internal failure.
- The safety functions are defined as follows:
Mode 1:
- OS1 and OS2 must be disabled when the actuator is detected as released.
- OS1 and OS2 must be disabled when the actuator is no longer detected.
- OS1 and OS2 must be deactivated if IS1 or IS2 is not active.
Mode 2:
- OS1 and OS2 must be disabled when the actuator is no longer detected.
- OS1 and OS2 must be deactivated if IS1 or IS2 is not active.
Mode 3:
- OS1 must be disabled when the actuator is detected as released.
- OS2 must be disabled when the actuator is no longer detected.
- OS1 must be deactivated when IS1 is not enabled.
- OS2 must be deactivated when IS2 is not enabled.
With any actuation mode the device must keep the guard closed and locked when
the solenoid is enabled (operating principle for versions NS E•••••••, NS H•••••••,
NS M•••••••) or disabled (operating principle for versions NS D•••••••, NS
G•••••••, NS L•••••••) and a force less than the declared value F
Zh
is applied.
- The EDM External Device Monitoring function (where present) is a function which
allows the device to monitor the state of external contactors. Activation and deac-
tivation of external contactors must follow the NS device safety outputs within a
maximum delay (see paragraph TECHNICAL DATA).
5.3 Description of operation
Note: the following functional descriptions refer to a device with safety outputs en-
abled with guard closed and locked (mode 1).
A device with safety outputs enabled by closing the guard (mode 2) differs from the
above operating mode for the fact that the safety outputs OS1 and OS2 are enabled
without the f4 function verifying the guard locking.
Mode 3 differs, in that OS1 is enabled when the guard is closed and locked, and OS2
with guard closed.
Following correct installation in accordance with these instructions, the safety device
can be powered. The diagram below represents the 7 logic functions which interact
inside the safety device.
In the initial “POWER ON” state, the safety device f0 function carries out an internal
self diagnosis. When this terminates successfully, the device switches to the “RUN”
state. If the test is not passed because of an internal failure, the device enters the
“ERROR” state.
In EDM versions, on power-up, the EDM signal is checked and must be active with-
in a maximum delay from device start. If the EDM signal is not present, after the de-
lay time the f5 function sets the device to the “ERROR” state. If present, the EDM
function must be used.
f4
f1
f2
f3
OS1
OS2
IS2
IS1
IN
O4
O3
OUT
CODE
ACT
LOCK
I5
EDM
f5
f6
IE1
IE2
f0
PWR
A2A1
The “RUN” state is the normal operation state:
the f1 function evaluates the state of inputs IS1,
IS2; at the same time the f2 function checks the
presence of the actuator and the f4 function veri-
fies that the actuator has been locked.
In the EDM versions the f5 function verifies the
coherence of the EDM signal during state chang-
es and when the safety outputs are off. When
these three conditions are given, the f3 function
of the device enables the safety outputs OS1 and
OS2.
The device inputs IS1 and IS2 are normally activat-
ed simultaneously and so are monitored both for
state and coherence. In the event of deactivation
of just one of the two inputs, the device deacti-
vates the safety outputs and signals a non-coher-
ent condition of the inputs via the IN LED flashing
green/orange. In order to reactivate the safety outputs, both inputs have to be deacti-
vated and subsequently reactivated.
The f6 function verifies the coherence of the enable/disable signals of the actuator
lock command.
In the RUN state, function f0 carries out internal test cycles in order to identify any fail-
ures. Detection of any internal error switches the device to the “ERROR” state (PWR
LED continuously red) which deactivates immediately the safety outputs.
The “ERROR” state can be reached also where short-circuits between the safety out-
puts (OS1, OS2), or a short circuit of an output towards ground or towards the supply
voltage, are identified. In this case also, the F3 function deactivates the safety out-
puts and the error state is indicated by the OUT LED flashing red.
The O3 signalling output activates during the “RUN” state, at the actuator insertion
into the device, independently of the state of the IS1 and IS2 inputs. The state of this
output is displayed via the ACT LED.
The O4 signalling output activates during the “RUN” state, when the actuator has
been introduced and locked into the device, independently of the state of the IS1 and
IS2 inputs. The state of this output is displayed via the LOCK LED.
The actuator lock or release command is transmitted to the device through the IE1
and IE2 inputs.
5.4 Description of the operation of versions NS •6••••••
f4
f1
f2
f3
OS1
OS2
IS2
IS1
IN
O4
O3
OUT
CODE
ACT
LOCK
I5
ACK
f5
f6
IE1
IE2
f0
PWR
A2A1
With versions NS •6••••••, function f5 checks
whether the reset command is present at input I5
(falling edge). Function f3 activates safety outputs
OS1 and OS2 if the following three conditions are
met: actuator locked (f4), safety inputs active (f1)
and reset command present (f5). Output O3 alter-
nates between high and low and the ACK LED
(green) flashes when the actuator has been intro-
duced and the device is waiting for the reset com-
mand. After receiving the reset command, output
O3 is activated and the ACK LED illuminates. The re-
set command remains active until the actuator is re-
moved. The activation of an additional release de-
vice (escape release or auxiliary release) fully inter-
rupts the reset process.
Table 1: Electrical connections of the items with integrated control devices
NS •••••SRK-N001 NS •••••SRK-N002 NS •••••STK-N003 NS •••••SRK-N004 NS •••••SRK-N005 NS •••••SRK-N006 Connections
A1
A2
IS1
OS1
IS2
OS2
IE1
IE2
O3
O4
I3
I5
2x M12, 12-pole
A1
A2
IS1
OS1
IS2
OS2
IE1
IE2
O3
O4
I3
I5
2x M12, 12-pole
O3
A1
A2
IS1
OS1
IS2
OS2
I4
O4
I3
M23, 19-pole
A1
A2
IS1
OS1
IS2
OS2
IE1
IE2
O3
O4
I3
I5
2x M12, 12-pole
A1
A2
IS1
OS1
IS2
OS2
IE1
IE2
O3
O4
I3
I5
2x M12, 12-pole
A1
A2
IS1
OS1
IS2
OS2
IE1
IE2
O3
O4
I3
I5
2x M12, 12-pole
Two M12 connectors, 12-pole
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
A
B
Attention: Connector A is for con-
necting the switch while connector B is
for connecting the control device. Re-
versing connectors A and B can result
in damage to the electronics within the
device.
M23 connector, 19-pole
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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