Operating instructions enabling switch zxe – EUCHNER ZXE User Manual

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Operating Instructions Enabling Switch ZXE

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 com-

pliance with the requirements applicable to safety cir-

cuits 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 ac-

cordance 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 docu-

ment 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 func-

tion. Incorrect use or tampering can lead to severe

injuries to personnel.

All the safety and accident prevention regula-

tions for the specific application, e.g. guide-

lines 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 ac-

cording to EN ISO 10218-1, DIN EN 60204-1,

EN ISO 13849-1, DIN EN ISO 11161 and

VDI 2854.

In safety circuits, both contacts on the enabling

switch must be evaluated separately (2-channel)

(Figure 2).

No commands for potentially hazardous condi-

tions are allowed to be initiated with enabling

switches alone.

The safety function of enabling switches must

not be bypassed (bridging of contacts), manipu-

lated 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 autho-

rized 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.

Mounting

The enabling switch must be fitted in a suitable

housing.

Screw the knurled nut on the enabling switch down

as far as possible and slide enabling switch without

protective cap through the front panel cut-out from

the rear.

Screw protective cap onto the front of the enabling

switch to the stop.

Screw the knurled nut against panel and tighten.

During installation it must be ensured that all three

switch positions can be reached unhindered.

The switch must be securely fastened, but must not

be placed under stress by the fastening.

The device must be installed so that tampering

is not possible by simple mechanical measures

(clamping, adhesive tape, etc.).

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.

Setup

Check the enabling switch (enabling function at

stage 2, both contacts open at stage 1 and 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 electri-

cal 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

General

If 2-channel evaluation is used with monitor-

ing for same contact state, category 3 as per

EN ISO 13849-1 is attained.

Function

Stage 1: Off function, pushbutton not pressed
Stage 2: Enabling function, pushbutton pressed to

center position (actuating point)

Stage 3: 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 return-

ing from stage 3 to stage 1.
With versions ZXE-104833, ZXE-111276 and

ZXE-120348, a click sounds during the change

from stage 1 to stage 2 and during the return from

stage 2 to stage 1.

Fig. 1: Function of the switching element

a
b

E1
E2

NO 2

NO 1

NC 2

NO 1

Switching element

Switching

function

Travel diagram

Actuating point

Stage

Operation of the switch without protective cap. The actuating force

with protective cap is dependent on the ambient temperature.

Actuating travel [mm]

Actuating for

ce [N]

Contacts open

Contacts closed

ZXE-091336

ZXE-104833

ZXE-111276

ZXE-120348

ZXE-091336

ZXE-104833

ZXE-111276

ZXE-120348

Fig. 2: Application example

S21

S11 S12

S10 S13

13 14

23 24

S14

Safety module ESM-BA201

Enabling switch

Start

Outputs: release for setup

Actuating point