4
Operating Instructions
Safety Switch NZ.H/P
Correct use
Safety switches series NZ are interlocking devices
without guard locking (with safety function). The
actuator is uncoded (e.g. dog). In combination with
a movable safety guard and the machine control,
this safety component prevents 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:
f
Starting commands that cause a dangerous ma-
chine function must become active only when the
safety guard is closed.
f
Opening the safety guard triggers a stop com-
mand.
f
Closing a safety 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.
Devices from this series can be used as safe position
encoders.
Before the device is used, a risk assessment must
be performed on the machine, e.g. in accordance
with the following standards:
f
EN ISO 13849-1, Safety of machinery – Safety-re-
lated parts of control systems – Part 1: General
principles for design
f
EN ISO 12100, Safety of machinery – General
principles for design – Risk assessment and risk
reduction
f
IEC 62061, Safety of machinery – Functional
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:
f
EN ISO 13849-1, Safety of machinery – Safety-re-
lated parts of control systems – Part 1: General
principles for design
f
EN ISO 14119, Safety of machinery – Interlocking
devices associated with guards – Principles for
design and selection
f
EN 60204-1, Safety of machinery – Electrical
equipment of machines.
Important!
f
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.
f
If the simplified method according to section 6.3
of EN ISO 13849-1:2008 is used for determining
the Performance Level (PL), the PL might be re-
duced if several devices are connected in series.
f
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.
f
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 personal protection function.
f
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.
f
Mounting, electrical connection and setup only
by authorized personnel possessing special
knowledge about handling safety components.
Function
Precision single limit switches are used for posi-
tioning and control applications in mechanical and
systems engineering.
The switching element is actuated via a lever arm.
See travel diagram (see Figure 5).
Switching states
The detailed switching states for your switch can be
found in Figure 5. All available switching elements
are described there.
Mounting
NOTICE
Device damage due to improper mounting and
unsuitable ambient conditions.
f
Safety switches and actuators must not be used
as an end stop.
f
Observe EN ISO 14119:2013, sections 5.2 and
5.3, for information about fastening the safety
switch and the actuator.
f
Observe EN ISO 14119:2013, section 7, for
information about reducing the possibilities for
bypassing an interlocking device.
f
Protect the switch head against damage.
f
The actuator (lever arm) must be positively mount-
ed to the actuating shaft. The polygon drives on
the actuator and actuating shaft must engage
with each other (see Figure 2).
f
To ensure correct operation, the trip dogs must
be fitted so that the actuator is deflected by at
least an angle of
45°
+5°
(achievement of the
stipulated contact opening, see Figure 8 and
Important!
f
To prevent the actuating element from bouncing,
the dog must run out gradually (see Figure 1).
α
α
α
Figure 1: Dog shape
Adjustment options
Vertical actuator adjustment 4 x 90°/8 x 45°
(positive mounting)
Example:
Figure 2: Vertical actuator adjustment
Horizontal adjustment 4 x 90°
Figure 3: Horizontal adjustment
1. Remove the screws from the actuating head.
2. Set the required direction.
3. Tighten the screws with a torque of 1.2 Nm.
Switching direction change with lever arm
actuation
Left/right switching Right switching
Left switching
(default setting)
Figure 4: Changing the switching direction
Electrical connection
WARNING
Loss of the safety function due to incorrect
connection.
f
Use only safe contacts ( ) for safety functions.
Use of the safety switch as an interlocking
device for personnel protection
At least one contact must be used. This signals
the position of the safety guard (for terminal assign-
The following information applies to devices
with plug connector:
f
Check that the plug connector is sealed.
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
(1 Nm on ES511) (for terminal assignment,
see Figure 7).
4. Check that the cable entry is sealed.
5. Close the switch cover and screw in place
(tightening torque 1.2 Nm).
Function test
WARNING
Fatal injury due to faults during the function test.
f
Before carrying out the function test, make sure
that there are no persons in the danger area.
f
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 actuating element must move easily. Close the
safety guard several times to check the function.
Electrical function test
1. Switch on operating voltage.
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.