EUCHNER NZ.VZ-xxxVS - Manual (Page 5)

Operating Instructions NZ.VZ-...VS Safety Switch
Correct use
Safety switches series NZ.VZ-...VS... are interlocking
devices with guard locking without guard locking
monitoring. The version VSH does not have guard locking
according to EN 1088.
In combination with a safety guard and the machine
control, this safety component prevents the safety guard
from being opened while a dangerous machine movement
is being performed.
EN ISO 13849-1, Safety of machinery. Safety related
parts of control systems. General principles for design
EN ISO 14121, Safety of machinery. Risk assessment.
Principles
IEC 62061, Safety of machinery. Functional safety of
safety-related electrical, electronic and programmable
electronic control systems.
Correct use includes compliance with the relevant
requirements for installation and operation, particularly
EN ISO 13849-1, Safety of machinery. Safety related
parts of control systems. General principles for design
EN 1088, Safety of machinery. Interlocking devices
associated with guards. Principles for design and
selection
EN 60 204-1, Electrical equipment of machines
Important:
The user is responsible for the integration of the device
in 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
EN ISO 13849-1:2008 is used for validation, the Per-
formance Level (PL) may be reduced if several devices
are connected one after the other.
If a product data sheet is included with the product,
the information on the data sheet applies in case of
discrepancies with the operating instructions.
Safety precautions
Safety switches fulfill a personal protection function.
Incorrect installation or tampering can lead to severe
injuries to personnel.
Safety components must not be bypassed (bridging
of contacts), turned away, removed or otherwise
rendered ineffective.
On this topic pay attention in particular to the measures
for reducing the possibility of bypassing from
EN 1088:1995+A2:2008, section 5.7.
The switching operation may only be triggered by
actuators specially provided for this purpose which
are permanently connected to the protective guard.
The version VSH does not have guard locking
according to EN 1088 and is not allowed to be
used for the protection of people.
Mounting, electrical connection and setup only by
authorized personnel.
Function
The safety switch permits the locking of movable safety
guards. In the switch head there is a rotating cam that is
blocked/released by the guard locking pin. The guard
locking pin is moved on the insertion / removal of the
actuator and on the activation / deactivation of the guard
locking. During this process the switching contacts are
actuated.
If the cam is blocked, the actuator cannot be pulled out
of the switch head guard locking active.
Version VSM (guard locking by spring force)
The guard locking is held in position by a spring loaded
pin attached to a solenoid. The guard locking is released
when voltage is applied to the solenoid. The guard locking
functions in accordance with the closed-circuit current
principle.
The safety guard cannot be opened immediately in the
event of interruption of the solenoid power supply.
Figure 1: Locking method VSM
Version VSH
(guard locking by spring force, manual release)
This type must be used only in special cases after
strict assessment of the accident risk!
The safety guard can be opened immediately on
pressing 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 by solenoid force)
This type must be used only in special cases after
strict assessment of the accident risk!
The safety guard can be opened immediately in the
event of interruption of the solenoid power supply!
The guard locking is held in position by an electromag-
netically actuated pin and released by spring force. The
guard locking operates in accordance with the open-cir-
cuit current principle.
Fig. 2: Locking method VSE
Closing safety guard and activating guard locking
The guard locking pin is released by insertion of the
actuator into the safety switch.
VSM/VSH: The guard locking pin is moved to locked
position by spring force.
VSE: The guard locking pin is moved to locked position
when the solenoid operating voltage is applied.
The safety circuit is closed.
Deactivating guard locking, opening safety guard
VSM: The guard locking pin releases the cam when the
solenoid operating voltage is applied.
The actuator can be removed.
Safety circuit is positively opened and blocked in this
position when the actuator is removed. This signals that
the safety guard is open.
VSH: If the manual release is pressed, the locking pin
releases the cam.
The actuator can be removed.
Safety circuit is positively opened and blocked in this
position when the actuator is removed. This signals that
the safety guard is open.
VSE: The guard locking pin releases the cam when the
solenoid operating voltage is switched off.
The actuator can be removed.
Safety circuit is positively opened and blocked in this
position when the actuator is removed. This signals that
the safety guard is open.
Changing the approach direction
Fig. 3: Changing the approach direction
Insert the actuator in the actuating head.
Remove the screws from the actuating head.
Set the required direction.
Tighten the screws with a torque of 1.2 Nm.
Safety switch series
NZ.VZ-...VSM/VSH/VSE
Prior to making changes to the locking solenoid
the actuator must be inserted.
On NZ.VZ-...VSH the manual release must not be
pressed during changing.
Fig. 4: Changing the locking solenoid
Installation
The switch must be protected against contact with
inflammable material or accidental touching.
Safety switches and actuators must not be used as
an end stop.
Mount the safety switch only in assembled condition!
Assemble the safety switch so that
access to the switch is difficult for operating personnel
when the safety guard is open.
it is possible to check and replace the safety switch.
Insert the actuator in the actuating head.
Mount the safety switch positively.
Permanently connect the actuator to the safety guard
so that it cannot be detached, e.g. using the enclosed
non-removable screws, rivets or welding.
Fit an additional stop for the movable part of the safety
guard.
Protection against environmental influences
A lasting and correct safety function requires that the
actuating head must be protected against the penetration
of foreign bodies such as swarf, sand, blasting shot etc.
Cover the actuating slot, the actuator and the rating plate
during painting work!
Electrical connection
When choosing the insulation material and wire for
the connections, attention is to be paid to the over-
temperature in the housing (depending on the
operating conditions).
For NZ.VZ-...VS without plug connector:
For use and applications as per the requirements of
, a rigid copper wire 60/75 °C is to be used.
The operating voltage for the locking solenoid must match
the value on the rating plate (e.g. U
s
= DC 24 V).
The connection for the locking solenoid is made using
plug connectors according to DIN 43650A / ISO 4400
(see Figure 7).
Plug connectors with a built-in rectifier (see Figure 7)
must be used for AC power.
locked unlocked open
locked unlocked open
D
C
4
3
1
2
B
E (A)
Solenoid
Actuating head
Approach direction as
set on delivery
Position
set on delivery