schmersal EX-Z/T 235 User manual

EX-Z/T 235
Operating instructions
Position switch
EN 1
1. About this document
1.1 Function
This operating instructions manual provides all the information you
need for the mounting, set-up and commissioning to ensure the safe
operation and disassembly of the safety switchgear. The operating
instructions must be available in a legible condition and a complete
version in the vicinity of the device.
1.2 Target group: authorised qualified personnel
All operations described in this operating instructions manual must
be carried out by trained specialist personnel, authorised by the plant
operator only.
Please make sure that you have read and understood these operating
instructions and that you know all applicable legislations regarding
occupational safety and accident prevention prior to installation and
putting the component into operation.
The machine builder must carefully select the harmonised standards
to be complied with as well as other technical specifications for the
selection, mounting and integration of the components.
1.3 Explanation of the symbols used
Information, hint, note:
This symbol is used for identifying useful additional information.
Caution: Failure to comply with this warning notice could
lead to failures or malfunctions.
Warning: Failure to comply with this warning notice could
lead to physical injury and/or damage to the machine.
1.4 Appropriate use
The products described in these operating instructions are developed
to execute safety-related functions as part of an entire plant or machine.
It is the responsibility of the manufacturer of a machine or plant to
ensure the correct functionality of the entire machine or plant.
The safety switchgear must be exclusively used in accordance with
the versions listed below or for the applications authorised by the
manufacturer. Detailed information regarding the range of applications
can be found in the chapter "Product description".
1.5 General safety instructions
The user must observe the safety instructions in this operating
instructions manual, the country specific installation standards as well
as all prevailing safety regulations and accident prevention rules.
Further technical information can be found in the Schmersal
catalogues or in the online catalogue on the Internet:
www.schmersal.net.
The information contained in this operating instructions manual is
provided without liability and is subject to technical modifications.
There are no residual risks, provided that the safety instructions as well
as the instructions regarding mounting, commissioning, operation and
maintenance are observed.
1.6 Warning about misuse
In case of improper use or manipulation of the safety
switchgear, personal hazards or damages to machinery
or plant components cannot be excluded. The relevant
requirements of the standard ISO 14119 must be observed.
Content
1 About this document
1.1 Function ..............................................1
1.2 Target group: authorised qualied personnel..................1
1.3 Explanation of the symbols used ...........................1
1.4 Appropriate use ........................................1
1.5 General safety instructions ...............................1
1.6 Warning about misuse ...................................1
1.7 Exclusion of liability .....................................2
2 Product description
2.1 Ordering code .........................................2
2.2 Special versions........................................2
2.3 Purpose ..............................................2
2.4 Technical data .........................................2
2.5 Classication ..........................................2
3 Mounting
3.1 General mounting instructions .............................3
3.2 Dimensions ...........................................3
4 Electrical connection
4.1 General information for electrical connection..................4
4.2 Contact variants........................................4
5 Set-up and maintenance
5.1 Functional testing.......................................4
5.2 Maintenance ..........................................4
6 Disassembly and disposal
6.1 Disassembly...........................................4
6.2 Disposal ..............................................4
7 EU Declaration of conformity
x.000 / 04.2019 / v.A. - 101185189-EN / J / 2019-04-12 / AE-Nr. 10852
EN Operating instructions. . . . . . . . . . . . .pages 1 to 6
Original

2
Operating instructions
Position switch 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
resulting from the use of unauthorised spare parts or accessories.
For safety reasons, invasive work on the device as well as arbitrary
repairs, 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 235-➂Z➃-➄-➅-➆-3D
No. Option Description
➀
Z Snap action A
T Slow action A
➁
Actuator selection, refer to catalogue
➂
02 2 NC
11 1 NO / 1 NC
20 2 NO
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
component".
Only if the information described in this operating instructions
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 Purpose
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 3GD. The installation and
maintenance 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
temperature 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
accordance with the relevant standards and the required
safety level.
2.4 Technical data
Designation in accordance with the ATEX Directive: LII 3GD
Designation in accordance with the standards: Ex tc IIIC T90°C Dc X,
Ex nC IIC T5 Gc X
Applied standards: EN 60947-5-1, EN 60079-0,
EN 60079-15, EN 60079-31
Design: fixings to EN 50047
Enclosure: zinc die-cast, enamel finish
Max. impact energy: 1 J
Protection class: IP67
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 Uimp:6 kV
Rated insulation voltage Ui:500 V
Thermal test current Ithe:10 A
Utilisation category: AC-15 / DC-13
Rated operating voltage/
Rated operating current Ie/Ue: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 Classification
Standards: ISO 13849-1
B10D (NC contact): 20,000,000
B10D (NO contact)
at 10% ohmic contact load: 1,000,000
Mission time: 20 years
MT
TF
Bdxx
hs/h3600
D
10Dopop
op
n
0,1 x nop tcycle
(Specifications can vary depending on the application-specific
parameters hop, dop, tcycle as well as the load.)

3
EX-Z/T 235
Operating instructions
Position switch
EN
3. Mounting
3.1 General mounting instructions
Fitting is only authorised in a de-energised condition.
The enclosure can be fixed by means of 2 mounting holes. The
mounting dimensions are mentioned at the rear of the enclosure.
The fixing screws must be protected against unauthorised tampering.
The use of a protective ground wire is imperative. The enclosure must
not be used as an end stop. Any mounting position.
To ensure a proper functioning, the switch must be installed so that
the required switch travel is obtained. For safety functions, at least the
positive break travel indicated in the switch travel diagram (refer to
catalogue) must be obtained. All components have sufficient after-
travel to compensate for inaccuracies in the guidance of the actuating
system. The actuation of the switch beyond its end stop however must
be avoided.
Please observe the recommendations regarding maximum
impact energy, actuating speed and tightening torque in the
technical data.
Please observe the relevant requirements of the standards
ISO 12100, ISO 14119 and ISO 14120.
3.2 Dimensions
All measurements in mm.
Position switches EX-Z/T 235
22
13.5
30
20
30
63.5
8.5
20
4.3
Mounting of the actuating heads
Repositioning the actuating heads (R, 1R, 4R, K, 3K, 4K, V.H)
The actuating head can be repositioned by 4 x 90°. Unscrew the four
screws of the actuating head (Philips tip profile PZ1), reposition the
actuating head in the desired position and retighten the four screws
(tightening torque 0.45 Nm).
Repositioning the roller lever (H.)
The (offset) roller arm may be reversed, so that the roller faces the
inside of the arm.
Positioning the lever (H.)
10°
10°
10
°
10°
The roller lever can be repositioned over 360° on the toothed shaft in
10° steps. Unscrew the hexagonal screw approx. 4 mm, reposition the
lever in the desired position and retighten the screw.
Length-adjustable lever (7H, 10H)
To adjust the length of the lever, unscrew the fixing screw of the lever.
Firmly retighten the screw after the length adjustment.
Position switches with 7H, 10H actuator or spring rod lever
AF are without positive break and not suitable for safety
functions. Ordering suffix for actuator 7H with positive break:
-2138.

4
Operating instructions
Position switch EX-Z/T 235
EN
Actuation of the position switches
Top plunger
A
A End stop
Roller plunger
max. 30°
Cam disc
front side
Trailing edge
4. Electrical connection
4.1 General information for electrical connection
The electrical connection may only be carried out by
authorised personnel in a de-energised condition.
The contact labelling can be found in the wiring compartment of the
switch.
Cable glands (included in delivery) are only authorised for permanent
cables. The constructor must provide for the necessary strain relief.
After wiring, dust and soiling must be removed from the wiring
compartment.
4.2 Contact variants
Contacts are shown with safety guard closed.
1 NO / 1 NC 2 NC 2 NO
EX-Z/T 235-11Z-3D EX-Z/T 235-02Z-3D EX-T 235-20Z-3D
13
21
14
22
A
11
21
12
22
A
A
13
23
14
24
Position switches with two NO contacts (-20) are not suitable
for safety functions.
5. Set-up and maintenance
5.1 Functional testing
The safety function of the safety components must be tested.
The following conditions must be previously checked and met:
- The installation is executed according to the instructions
- The connection is executed correctly
- The cable is correctly executed and connected
- Check the free movement of the actuating element
- The safety component is not damaged
- Remove particles of dust and soiling
- Check cable entry and connections in de-energised condition
5.2 Maintenance
In case of correct installation in accordance with the instructions
described above, the component requires little maintenance.
For use in extreme conditions, we recommend routine maintenance
including the following steps:
1. Check the correct fixing of the actuator and the safety switchgear
2. Lubricate the shaft or plunger
3. Remove particles of dust and soiling
4. Check cable entry and connections in a de-energised condition
Do not open the device when live.
Throughout the operative life cycles of the safety switchgear,
suitable constructive and organisational measures are to be
taken to prevent against tampering and to prevent the safety
device being overridden.
Damaged or defective components must be replaced.
For explosion protection reasons, the component must be
exchanged after max. 20 million operations.
6. Disassembly and disposal
6.1 Disassembly
The safety switchgear must be disassembled in a de-energised
condition only.
6.2 Disposal
The safety switchgear must be disposed of in an appropriate manner in
accordance with the national prescriptions and legislations.

5
EN
EX-ZT235-F-EN
EX-Z/T 235
Operating instructions
Position switch
7. EU Declaration of conformity
The currently valid declaration of conformity can be
downloaded from the internet at www.schmersal.net.
Name of the component: EX-Z/T 235
Type: See ordering code
Marking:
L
II 3G Ex nC IIC T5 Gc X
L
II 3D Ex tc IIIC T90°C Dc X
Description of the component: Positive break position switch for safety functions
or position switch without safety function
Relevant Directives: 2006/42/EC
2014/34/EU
2011/65/EU
Machinery Directive (for safety components
labelled with "Safety component" on the type
plate).
Explosion Protection Directive (ATEX)
RoHS-Directive
Applied standards: DIN EN 60947-5-1:2010,
EN 60079-0:2012 + A11:2013,
EN 60079-15:2010,
EN 60079-31:2014
Person authorised for the compilation
of the technical documentation:
Oliver Wacker
Möddinghofe 30
42279 Wuppertal
Place and date of issue: Wuppertal, January 16, 2019
Authorised signature
Philip Schmersal
Managing Director
EU Declaration of conformity
Original K.A. Schmersal GmbH & Co. KG
Möddinghofe 30
42279 Wuppertal
Germany
Internet: www.schmersal.com
We hereby certify that the hereafter described components both in their basic design and construction conform
to the applicable European Directives.

K.A. Schmersal GmbH & Co. KG
Möddinghofe 30, 42279 Wuppertal
Germany
Phone: [phone]
Telefax: [phone]
E-Mail: [email protected]
Internet: www.schmersal.com