EUCHNER ZXE - Manual (Page 3)

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:
f
for setting up
f
for observing work sequences
f
for maintenance.
Important:
f
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.
f
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.
f
The enabling switch user must assess and docu-
ment remaining risks.
f
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.
f
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.
f
Screw protective cap onto the front of the enabling
switch to the stop.
f
Screw the knurled nut against panel and tighten.
f
During installation it must be ensured that all three
switch positions can be reached unhindered.
f
The switch must be securely fastened, but must not
be placed under stress by the fastening.
f
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
f
incorrect use
f
non-compliance with safety regulations
f
electrical connection not performed by authorized
personnel
f
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
0 2 4 6
10
20
30
40
0
a
b
1 3 2
a
b
E1
E1
E2
E2
a
b
E1
E1
E2
E2
NO 2 NO 1
C1 C2
3
2 1
NC 2 NO 1
C1 C2
3 2 1
E1 E2
E2 E1
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
E1 E2
C1 C2
S14
Safety module ESM-BA201
Enabling switch
Start
Outputs: release for setup
Actuating point