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Operating Instructions
Safety Switch NZ.VZ-...VS
Scope
These operating instructions are valid for all safety
switches NZ.VZ-...VS. These operating instructions,
the document Safety information and maintenance
and any enclosed data sheet form the complete user
information for your device.
Supplementary documents
The overall documentation for this device consists
of the following documents:
Document title
Contents
(document number)
Safety information
Basic safety information
(2525460)
Operating instructions
(this document)
(2094066)
Declaration of con-
Declaration of conformity
formity
Any additions to the
Take any associated additions to
operating instructions
the operating instructions or data
sheets into account.
Important!
Always read all documents to gain a complete
overview of safe installation, setup and use of
the device. The documents can be downloaded
from www.euchner.com. For this purpose, enter
the doc. no. or the order number for the device
in the search box.
Correct use
Safety switches series NZ.VZ-...VS are interlocking
devices with guard locking solenoid for process
protection (type 2) without guard locking monitoring.
The actuator has a low coding level. In combination
with a movable guard and the machine control, this
safety component prevents dangerous machine
functions from occurring while the guard is open. A
stop command is triggered if the 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
guard is closed.
Opening the guard triggers a stop command.
f
Closing a guard must not cause automatic starting
f
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 are suitable only for process
protection.
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
f
EN ISO 12100
f
IEC 62061
f
Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
EN ISO 13849-1
f
EN ISO 14119
f
EN 60204-1
f
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 data sheet is included with the product, the
f
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.
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.
The switching operation must be triggered only
f
by actuators designated for this purpose.
Prevent bypassing by means of replacement
f
www
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
f
by authorized personnel possessing special
www
knowledge about handling safety components.
CAUTION
Danger due to high housing temperature.
Protect switch against touching by personnel or
f
contact with flammable material.
Function
The safety switch permits the locking of movable
guards for process protection.
The switch contains a rotating switching disk and a
locking arm that block/release the guard locking pin.
The guard locking pin is moved on the insertion/
removal of the actuator and on the activation/
release of the guard locking. During this process
the switching contacts are actuated.
If the guard locking pin is blocked (guard locking
active), the actuator cannot be pulled out of the
switch head. For design reasons, guard locking
can be activated only when the guard is closed
(prevention of inadvertent locking position (faulty
closure protection)).
The safety switch is designed so that fault ex-
clusions for internal faults in accordance with
EN ISO 13849-2:2013, Table A4, can be assumed.
Version VSM
(guard locking actuated by spring force and released
by power-ON)
Activating guard locking: close guard; no voltage
f
at the solenoid
Releasing guard locking: apply voltage to the
f
solenoid
The spring-operated guard locking functions in ac-
cordance with the closed-circuit current principle. If
the voltage is interrupted at the solenoid, the guard
locking remains active and the guard cannot be
opened directly.
If the guard is open when the power supply is
interrupted and is then closed, guard locking is
activated. This can lead to persons being locked
in unintentionally.
Fig. 1: Locking method VSM
6
Version VSH
(guard locking actuated by spring force and released
by manual release)
Important!
Guard locking devices according to the open-cir-
f
cuit current principle are not intended for pro-
tecting personnel.
Use as guard locking for personnel protec-
f
tion is possible only in special cases, after
strict assessment of the accident risk (see
EN ISO 14119:2013, section 5.7.1)!
The guard can be opened immediately on press-
f
ing the manual release!
The guard locking is held in position by spring force
and released by pressing the manual release. The
guard locking is independent of the power supply.
Version VSE
(guard locking actuated by power-ON and released
by spring force)
Activating guard locking: apply voltage to the
f
solenoid
Releasing guard locking: disconnect voltage from
f
the solenoid
The magnetically actuated guard locking operates in
accordance with the open-circuit current principle. If
the voltage at the solenoid is interrupted, the guard
locking is released and the guard can be opened
directly!
Fig. 2: Locking method VSE
Switching states
The detailed switching states for your switch can
be found in Fig. 4. All available switching elements
are described there.
Guard open
VSM, VSH and VSE:
The safety contacts
are open.
Guard closed and not locked
VSM, VSH and VSE:
The safety contacts
are closed.
Guard closed and locked
VSM, VSH and VSE:
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.
Additionally pay attention to the door radius and
the mounting options (see Fig. 10).
Manual release
Some situations require the guard locking to be
released manually (e.g. malfunctions or an emer-
gency). A function test should be performed after
release.
More information on this topic can be found in the
standard EN ISO 14119:2013, section 5.7.5.1. The
device can feature the following release functions:
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