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Operating Instructions
Safety Switch NM..AV/AL
Correct use
Safety switches series NM are interlocking devices
without guard locking (with safety function). Opera-
tion is via a hinge.
In combination with a movable safety guard and
the machine control, this safety component pre-
vents dangerous machine functions from occurring
while the safety guard is open. A stop command is
triggered if the safety guard is opened during the
dangerous machine function.
This means:
Starting commands that cause a dangerous ma-
f
chine function must become active only when the
safety guard is closed.
Opening the safety guard triggers a stop com-
f
mand.
Closing a safety guard must not cause automatic
f
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:
EN ISO 13849-1, Safety of machinery – Safety-re-
f
lated parts of control systems – Part 1: General
principles for design
EN ISO 12100, Safety of machinery – General
f
principles for design – Risk assessment and risk
reduction
IEC 62061, Safety of machinery – Functional
f
safety of safety-related electrical, electronic and
programmable electronic control systems.
Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
EN ISO 13849-1, Safety of machinery – Safety-re-
f
lated parts of control systems – Part 1: General
principles for design
EN ISO 14119, Safety of machinery – Interlocking
f
devices associated with guards – Principles for
design and selection
EN 60204-1, Safety of machinery – Electrical
f
equipment of machines.
Important!
The user is responsible for the proper integration
f
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.
If the simplified method according to section 6.3
f
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.
Logical series connection of safe contacts is
f
possible up to PL d in certain circumstances.
More information about this is available in
ISO TR 24119.
If a product data sheet is included with the prod-
f
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 personal protection function.
Safety components must not be bypassed,
f
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.
Mounting, electrical connection and setup only
f
by authorized personnel possessing special
knowledge about handling safety components.
Function
The safety switch monitors the position of movable
safety guards. The switching contacts are actuated
on the opening/closing the hinge.
The safety contacts
are positively opened in this
process (see Figure 3).
The switch does not perform guard locking!
Switching states
The detailed switching states for your switch can be
found in Figure 3. All available switching elements
are described there.
Actuating element in free position
The safety contacts
are closed.
Actuating element in end position
The safety contacts
are open.
Mounting
NOTICE
Device damage due to improper mounting and
unsuitable ambient conditions
Safety switches and actuators must not be used
f
as an end stop.
Observe EN ISO 14119:2013, sections 5.2 and
f
5.3, for information about fastening the safety
switch and the actuator.
Observe EN ISO 14119:2013, section 7, for
f
information about reducing the possibilities for
bypassing an interlocking device.
Protect the switch head against damage.
f
To ensure correct operation:
Connect safety switch actuation axis to the
f
hinged actuator on the safety guard or insert
in the hinge.
Positively connect safety switch actuation axis
f
and hinged actuator to the moving part of the
safety guard (e.g. door).
Fit the actuation axis such that the angle of rota-
f
tion on actuation is at least
25°
of stipulated contact opening, see Figure 4).
Changing the actuating direction
A
Figure 1: Changing the actuating direction
1. Remove the screws from the actuating head.
2. Set the required direction.
3. Tighten the screws with a torque of 0.6 Nm.
Electrical connection
WARNING
Loss of the safety function due to incorrect
connection.
Use only safe contacts (
) for safety functions.
f
4
Figure 2: Opening the safety switch
Use of the safety switch as an interlocking
device for personnel protection
At least one contact
the position of the safety guard (for terminal assign-
ment, see Figure 3).
The following information applies to devices
with cable entry:
1. Break out the required entry 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 0.6 Nm).
Function test
WARNING
Fatal injury due to faults during the function test.
Before carrying out the function test, make sure
f
that there are no persons in the danger area.
Observe the valid accident prevention regula-
f
tions.
Check the device for correct function after installa-
tion and after every fault.
Proceed as follows:
(achievement
+5°
Mechanical function test
The actuating element must move easily. Close the
safety guard several times to check the function.
Electrical function test
1. Switch on operating voltage.
M=0,6 Nm
2. Close all safety guards.
The machine must not start automatically.
¨
¨
3. Start the machine function.
4. Open the safety guard.
The machine must switch off and it must not be
¨
¨
possible to start it as long as the safety guard
is open.
Repeat steps 2 - 4 for each safety guard.
Inspection and service
WARNING
Danger of severe injuries due to the loss of the
safety function.
If damage or wear is found, the complete switch
f
must be replaced. Replacement of individual
parts or assemblies is not permitted.
Check the device for proper function at regular
f
intervals and after every fault. For informa-
tion about possible time intervals, refer to
EN ISO 14119:2013, section 8.2.
Inspection of the following is necessary to ensure
trouble-free long-term operation:
correct switching function
f
secure mounting of all components
f
damage, heavy contamination, dirt and wear
f
sealing of cable entry
f
loose cable connections or plug connectors.
f
Information: The year of manufacture can be seen
in the bottom, right corner of the type label.
must be used. This signals
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