EUCHNER SN01 Single Limit Switches - Handbuch (Seite 4)

Operating Instructions Precision Single Limit Switches N01/NB01/SN01
Correct use
Precision single limit switches are used for positioning and control
applications in mechanical and systems engineering.
For general applications, snap-action switching elements that
are not positively driven are used. For usage as safety switches,
only the switching element ES588 with positively driven NC
contacts is allowed.
The safety switches are positively driven auxiliary power switches
and comply with the requirements as per IEC 60947-5-1/
EN 60947-5-1 annex K.
In combination with a separating safety guard
, this safety device
prevents dangerous machine movements from occurring while
the safety guard is open. A stop command is triggered if the
safety guard is opened during the dangerous machine function.
Before safety switches are used, a risk assessment must be
performed on the machine in accordance with
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.
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
Incorrect use
Precision single limit switches with snap-action switching elements
without positive opening must not be used in safety circuits.
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 Performance 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
In safety circuits, only the switching elements ES588 with
positively driven NC contacts are allowed.
Precision single limit switches in safety circuits provide a perso-
nal protection function. Incorrect installation or tampering can
lead to severe injuries to personnel.
Precision single limit switches in safety circuits 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 redu-
cing the possibility of bypassing from EN 1088:1995+A2:2008,
section 5.7.
Where precision single limit switches are used in safety
circuits, switches and trip dogs must be fitted in such a
way that they are adequately secured against movement.
To meet these requirements:
The fixings must be reliable and must also require the
use of a tool to undo them.
The use of slots must be limited to the initial adjustment.
Precautions must be taken to ensure that there is no
movement after adjustment (e.g. using bolts or dowel
pins).
Mounting, electrical connection and setup only by authorized
personnel.
If the operating instructions should become lost, this
document can be downloaded from www.EUCHNER.de.
Additional languages can also be found there.
Function
The switching elements are actuated by means of plungers. Dif-
ferent plunger types are used depending on the application
(switching point accuracy and approach speed) (see Figure 1).
In general applications the plunger is actuated by trip dogs in
accordance with DIN 69639 which are mounted with an
interference fit in trip rails in accordance with DIN 69638.
Figure 1: Plunger types and approach directions
Changing the approach direction
Figure 2: Changing the approach direction
The approach direction can be adjusted by 90° on chisel and
roller plungers.
After unscrewing the locking screw, the plunger can be changed
easily to the required direction.
After changing the direction, the locking screw must be refitted
(see Figure 2).
Installation
Precision single limit switches and trip dogs must not be
used as an end stop.
Single limit switches and trip dogs must be arranged such
that they are adequately secured against movement.
When used in safety circuits, trip dogs must be positively
mounted on the machine/safety guard so that they cannot
be detached.
Due attention must be paid to the arrangement and shape
of the trip dogs during mounting (see Figure 3).
Protection against environmental influences
Safety venting valves (see Figure 3) are used to compensate for
the pumping action of the plunger. They must not be sealed.
Mask plunger, plunger guides, safety venting valves and rating
plate during painting work!
Electrical connection
The following applies for switches with UL approval:
For use as per the requirements of , a class 2 power
supply or a class 2 transformer according to UL1310 or
UL1585 must be used.
Connection cables for precision single limit switches installed
at the place of use must be separated from all moving and
permanently installed cables and un-insulated active elements
of other parts of the system which operate at a voltage of over
150 V. A constant clearance of 50.8 mm must be maintained.
This does not apply if the moving cables are equipped with
suitable insulation materials which possess an identical or high-
er dielectric strength compared to the other relevant parts of
the system.
With cable entry
Open switch cover.
For conductor cross-section, see tech. data.
For terminal assignment see Figure 11.
Fit suitable cable gland with captive O-ring. Seal cable carefully.
Sealing ring must be matched to the diameter of the cable.
Tighten screws for the connections to the switching elements
to the appropriate tightening torque (see tech. data).
Close switch cover and tighten cover screws to 0.5 Nm.
With plug connector
For connector assignments, see dimension drawings.
R2
,5
R2
,5
120 -0,5
Preferred approach direction
D = chisel R = roller K = ball
Functional check
When the safety guard is open, the safety switch must be
actuated in any safety guard position (overrun protection).
In safety circuits, check the safety function.
The machine must stop when the safety switch is actuated.
The machine must not start when the safety switch is
actuated.
Mechanical function test
Check the actuating element for freedom of movement.
Electrical function test
Actuate switch and check the switching function.
Inspection and service
In safety circuits, the entire single limit switch must be
replaced in case of damage or wear.
Repairs must be performed only by the manufacturer.
No servicing is required, but regular inspection of the
following is necessary to ensure trouble-free long-term
operation:
correct switching function
secure mounting of components
precise adjustment of trip dog in relation to single limit switch
dirt and wear
sealing of cable entry
loose cable connections or plug connectors
The single limit switches in safety circuits must be replaced
when the max. number of operating cycles is reached.
Note:The year of manufacture can be seen in the bottom,
right corner of the rating plate.
Exclusion of liability under the following
circumstances
incorrect use
non-compliance with safety regulations
installation and electrical connection not performed by
authorized personnel
failure to perform functional checks.
EC declaration of conformity
The manufacturer named below herewith declares that the
product fulfills the provisions of the directive(s) listed below and
that the related standards have been applied.
EUCHNER GmbH + Co. KG
Kohlhammerstraße 16
70771 Leinfelden-Echterdingen, Germany
Directives applied:
Machinery directive 2006/42/EC
Standards applied:
EN 60947-5-1:2004 + Cor.:2005 + A1:2009
EN 1088:1995+A2:2008
Leinfelden, July 2010
Dipl.-Ing. Michael Euchner
Director
Duc Binh Nguyen
Authorized representative empowered to draw up
documentation
The signed EC declaration of conformity is included with the
product.