2
Operating instructions
Position switches
EX-Z/T 235
EN
1.7 Exclusion of liability
We shall accept no liability for damages and malfunctions resulting from
defective mounting or failure to comply with this operating instructions
manual. The manufacturer shall accept no liability for damages resul-
ting from the use of unauthorised spare parts or accessories.
For safety reasons, invasive work on the device as well as arbitrary re-
pairs, conversions and modifications to the device are strictly forbidden;
the manufacturer shall accept no liability for damages resulting from
such invasive work, arbitrary repairs, conversions and/or modifications
to the device.
2. Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
EX-
➀➁
235-
➂
Z
➃
-
➄
-
➅
-
➆
-3D
No.
Option
Description
➀
Z
Snap action A
T
Slow action A
➁
Actuator selection, refer to catalogue
➂
02
2 NC contacts
11
1 NO contacts / 1 NC contacts
20
2 NO contacts
➃
H
Slow action with staggered contacts
UE
Slow action with overlapping contacts
➄
1297
Enclosure with transverse slotted holes
➅
2138
Roller lever 7H for safety applications
➆
1637
Gold-plated contacts
In accordance with the Machinery Directive, the type plate of
safety components is type plate is labelled "safety compo-
nent".
Only if the information described in this operating instruc-
tions manual are realised correctly, the safety function and
therefore the compliance with the Machinery Directive and
the Explosion Protection Directive is maintained.
2.2 Special versions
For special versions, which are not listed in the order code below 2.1,
these specifications apply accordingly, provided that they correspond to
the standard version.
2.3 Destination and use
The safety switches are suitable for hinged or sliding guards, which
need to be closed in order to provide for the necessary operational
safety. The components can be used in explosion-endangered areas of
Zone 2 and 22 equipment category 3 GD. The installation and mainte-
nance requirements to the standard series EN 60079 must be met.
Conditions for safe operation
Due to the specific impact energy, the components must be fitted with a
protection against mechanical stresses. The specific ambient tempe-
rature range must be observed. The user must provide for a protection
against the permanent influence of UV rays.
The user must evaluate and design the safety chain in ac-
cordance with the relevant standards and the required safety
level.
2.4 Technical data
Equipment category:
L
II 3GD
Ex protection:
Ex tc IIIC T90°C Dc X, Ex nC IIC T5 Gc X
Standards:
EN 60947-5-1, EN 60079-0, EN 60079-15,
EN 60079-31, BG-GS-ET-15
Design:
fixings to EN 50047
Enclosure:
zinc die-cast, enamel finish
Max. impact energy:
1 J
Actuating speed:
max. 1 ms
Protection class:
IP67 to EN 60529
Contact material:
Silver
Contact type:
change-over with double break Zb,
or 2 NC contacts, galvanically separated contact bridges
Switching system:
A
EN 60947-5-1, slow or snap action, NC contacts
with positive break
Connection:
screw terminals
Cable section:
min. 0.75 mm²; max. 2.5 mm²;
solid and stranded wire with conductor ferrules
Cable entry:
M20 x 1.5
Rated impulse withstand voltage U
imp
:
6 kV
Rated insulation voltage U
i
:
500 V
Thermal test current I
the
:
10 A
Utilisation category:
AC-15 / DC-13
Rated operating voltage/
Rated operating current I
e
/U
e
:
4 A / 230 VAC;
1 A / 24 VDC
Max. fuse rating:
6 A gG D-fuse
Required short-circuit current:
1000 A
Ambient temperature:
–20 °C … + 60 °C
Mechanical life:
20 million operations
Switching frequency:
max. 5000 / h
Max. Actuating speed:
1 m/s
Bounce duration:
slow action: < 3 ms;
snap action: in accordance with actuating speed
Switchover time:
slow action: in accordance with actuating speed
Cable cross-section of the cable glands
:
min. Ø 7 mm;
max. Ø 12 mm
Cable glands:
L
II 2GD
Tightening torque
- Cover screws:
min. 0.6 Nm
- Cable gland:
min. 8 Nm
2.5 Safety classification
Standards:
EN ISO 13849-1
B
10d
(NC contact):
20,000,000
B
10d
(NO contact)
at 10% ohmic contact load:
1,000,000
Service life:
20 years
MTTF
B
d
x
x
h
s/h
3600
d
10d
op
op
op
n
0,1 x n
op
t
cycle
(Specifications can vary depending on the application-specific parame-
ters h
op
, d
op
, t
cycle
as well as the load.)
