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Operating Instructions Enabling Switch ZSA/ZSR
Correct use
The EUCHNER enabling switch is a manually
operated command switch, which allows work to
be carried out in the danger area of automated
production systems in manual operating mode.
This mode must be secured with a lockable selector
switch according to EN 60204, part 1.
The enabling switch must be logically gated with
the machine control system in a manner that
ensures compliance with the requirements
applicable to safety circuits according to VDI 2854
and/or EN ISO 10218-1. Under the conditions
specified therein, the enabling signal may cancel
the protective action of moving safety guards.
Authorized operating personnel may then enter the
danger area:
for setting up
for observing work sequences
for maintenance.
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.
The enabling switch user must assess and
document remaining risks.
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.
Incorrect use
The enabling signal must not be simulated by fixing
the switching contact in stage 2.
Safety precautions
Enabling switches fulfill a personal protection
function. Incorrect use or tampering can lead to
severe injuries to personnel.
All the safety and accident prevention regulations
for the specific application, e.g. guidelines of the
employers liability insurance associations, safety
requirements of the VDI (EN ISO 10218-1,
VDI 2854), EN 60204, EN 12100, EN ISO 13849,
EN 61062, DIN VDE 0106 part 100, etc., must
be observed.
Electromechanical enabling switches/devices
are to be logically gated with the control system
in a manner that ensures compliance with the
requirements applicable to safety circuits
according to EN ISO 10218-1, DIN EN 60204-1,
EN ISO 13849-1, DIN EN ISO 11161 and
VDI 2854.
No commands for potentially hazardous
conditions are allowed to be initiated with
enabling switches alone.
The safety function of enabling switches must
not be bypassed (bridging of contacts),
manipulated or otherwise rendered ineffective.
The enabling switch must be protected against
attempts by the operator to bypass its
function.
Enabling switches may be used only by
authorized persons who can recognize hazards
in time and who are able to take appropriate
action immediately.
Every person present in the danger area must
carry his/her own enabling switch on his/her
person.
Mounting, electrical connection and setup only
by authorized personnel.
Function
Three-stage ZSA2.../ZSR2...
Stage 1: Off function, pushbutton not pressed
Stage 2: Enabling function, pushbutton pressed to
center position (actuating point)
Stage 3: Positively driven Off function, pushbutton
pushed to end stop
The enabling function is cancelled by releasing the
pushbutton or pressing it beyond the actuating
point. The enabling function does not reactivate
when returning from stage 3 to stage 1. For
information on the functions of the various versions,
see Figure 1.
Two-stage ZSA1...
The ZSA1 switch must not be used in safety
circuits.
Stage 1: Off function, pushbutton not pressed
Stage 2: Enabling function, pushbutton pressed to
end stop
The enabling function is removed by releasing the
pushbutton. For information on the functions of the
various versions, see Figure 1.
Mounting
A suitable holder must be used for the enabling
switch ZSA, e.g. the EUCHNER holder order no.
052 406.
Electrical connection
In the installation of a system, the cables and
wires used (except earth conductors) that can
be touched without opening or removing a
cover, or are laid on conductive parts external
to the device, must be either double insulated
or have reinforced insulation between core and
surface, or be surrounded by a metal sheath
of adequate current-carrying capacity in case
of a short between core and sheath.
For use and operation as per the
requirements, a power supply with the feature
"for use in class 2 circuits" must be used.
The max. cable length listed in the technical
data must not be exceeded.
Hazards due to crushing or cutting of the
connection cable must be prevented by suitable
measures:
Protecting the cable by laying it appropriately,
e.g. in a protective sleeve.
Monitoring short circuits using an evaluation unit.
Using cable with individually screened cores. The-
se screens are to be connected to the machine
or plant earthing system. In this way cable short
circuits can be detected and the control system
shut down immediately by the triggering of the
short circuit protection.
Setup
Check the enabling switch (enabling function at
stage 2 and positively driven – not for type ZSA1 –
at stage 3) by performing a functional check.
Service and inspection
No servicing is required, but to ensure trouble-free
long-term operation, regular inspection of the
electrical and mechanical function is required.
In the event of functional faults or damage,
the enabling switch must be replaced. Repairs
are only to be made by the manufacturer!
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
electrical connection not performed by authorized
personnel
function tests not performed
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 and standards applied:
Switch ZSA1
- Low voltage directive 2006/95/EC
- EN 60947-5-1: 2004
Three-position enabling switch
- Machinery directive 2006/42/EC
- EMC directive 2004/108/EC
- EN 60947-5-8:2006
Leinfelden, November 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.
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