4
Operating Instructions
Safety Switch NX…
Correct use
Safety switches series NX are interlocking devices
without guard locking (type 2). The actuator has
a low coding level. In combination with a movable
guard and the machine control, this safety compo-
nent prevents dangerous machine functions from
occurring while the guard is open. A stop command
is triggered if the guard is opened during the dan-
gerous machine function.
This means:
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Starting commands that cause a dangerous ma-
chine function must become active only when the
guard is closed.
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Opening the guard triggers a stop command.
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Closing a guard must not cause automatic starting
of a dangerous machine function. A separate start
command must be issued. For exceptions, refer to
EN ISO 12100 or relevant C-standards.
Before the device is used, a risk assessment must
be performed on the machine, e.g. in accordance
with the following standards:
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EN ISO 13849-1
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EN ISO 12100
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IEC 62061
Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
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EN ISO 13849-1
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EN ISO 14119
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EN 60204-1
Important!
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The user is responsible for the proper integration
of the device into a safe overall system. For this
purpose, the overall system must be validated,
e.g. in accordance with EN ISO 13849-2.
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If the simplified method according to section 6.3
of EN ISO 13849-1:2015 is used for determining
the Performance Level (PL), the PL might be re-
duced if several devices are connected in series.
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Logical series connection of safe contacts is
possible up to PL d in certain circumstances.
More information about this is available in
ISO TR 24119.
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If a product data sheet is included with the prod-
uct, the information on the data sheet applies
in case of discrepancies with the operating
instructions.
Safety precautions
WARNING
Danger to life due to improper installation or due
to bypassing (tampering). Safety components
perform a personnel protection function.
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Safety components must not be bypassed,
turned away, removed or otherwise rendered
ineffective. On this topic pay attention in partic-
ular to the measures for reducing the possibility
of bypassing according to EN ISO 14119:2013,
section 7.
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The switching operation must be triggered only
by actuators designated for this purpose.
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Prevent bypassing by means of replacement
actuators. For this purpose, restrict access to
actuators and to keys for releases, for example.
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Mounting, electrical connection and setup only
by authorized personnel possessing special
knowledge about handling safety components.
Function
The safety switch monitors the position of movable
guards. The switching contacts are actuated on the
insertion/removal of the actuator.
Switching states
The detailed switching states for your switch can be
found in Figure 3. All available switching elements
are described there.
Guard open
The safety contacts are open.
Guard closed
The safety contacts are closed.
Selection of the actuator
NOTICE
Damage to the device due to unsuitable actuator.
Make sure to select the correct actuator (see
table in Figure 5).
Additionally pay attention to the door radius and
the mounting options (see Figure 6).
The following versions are available:
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Standard
actuator with 1 mm insertion depth.
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Overtravel
actuator with 8 mm insertion depth.
Mounting
NOTICE
Device damage due to improper mounting and
unsuitable ambient conditions
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Safety switches and actuators must not be used
as an end stop.
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Observe EN ISO 14119:2013, sections 5.2 and
5.3, for information about mounting the safety
switch and the actuator.
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Observe EN ISO 14119:2013, section 7, for
information about reducing the possibilities for
bypassing an interlocking device.
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Protect the switch head against damage, as well
as penetrating foreign objects such as swarf,
sand and blasting shot, etc.
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The specified IP degree of protection is applica-
ble only if the housing screws, cable entries and
plug connectors are properly tightened. Observe
the tightening torques.
Changing the actuating direction
A
Figure 1: Changing the actuating direction
1. Unscrew and open switch cover.
2. Remove actuating head from the switch by
turning and refit in the required position (bayo-
net fastening).
3. Fit the enclosed locking pins for protection
against twisting (Figure 2). It is then not possi-
ble to change the actuating direction again.
Figure 2: Fitting the locking pins and the slot cover
4. Close the switch cover and screw in position.
5. Cover the unused actuating slot with the en-
closed slot covers.
Electrical connection
WARNING
Loss of the safety function due to incorrect
connection.
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Use only safe contacts ( ) for safety functions.
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Strip the insulation from the ends of the individual
wires over a length of 6
±1 mm
to ensure a reliable
contact.
The following information applies to devices
with cable entry:
1. Use a suitable tool to open the desired inser-
tion opening.
2. Fit the cable gland with the appropriate degree
of protection.
3. Connect and tighten the terminals with 0.5 Nm
(for terminal assignment, see Figure 3).
4. Check that the cable entry is sealed.
5. Close the switch cover and screw in place
(tightening torque 0.8 Nm).
Function test
WARNING
Fatal injury due to faults during the function test.
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Before carrying out the function test, make sure
that there are no persons in the danger zone.
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Observe the valid accident prevention regula-
tions.
Check the device for correct function after installa-
tion and after every fault.
Proceed as follows:
Mechanical function test
The actuator must slide easily into the actuating
head. Close the guard several times to check the
function.
Electrical function test
1. Switch on operating voltage.
2. Close all guards.
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The machine must not start automatically.
3. Start the machine function.
4. Open the guard.
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The machine must switch off and it must not be
possible to start it as long as the guard is open.
Repeat steps 2 - 4 for each guard.