schmersal EX-Z 355 Series User manual

EX-Z/T 355
Operating instructions
Position switches
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. he operating inst-
ructions 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 selec-
tion, mounting and integration of the components.
1.3 Explanation of the symbols used
Information, hint, note:
This symbol is used for identifying useful additional informa-
tion.
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 machinery or plant.
The safety switchgear must be exclusively used in accordance with the
versions listed below or for the applications authorised by the manufac-
turer. 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 instruc-
tions 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 provi-
ded 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 switch-
gear, personal hazards or damages to machinery or plant
components cannot be excluded when safety switchgear is
used. The relevant requirements of the standard ISO 14119
must be observed.
Content
1 About this document
1.1 Function ..............................................1
1.2 ..................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 Destination and use .....................................2
2.4 Technical data .........................................2
2.5  .....................................2
3 Mounting
3.1 General mounting instructions .............................3
3.2 Dimensions ...........................................3
3.3 Settings ..............................................3
3.4 Mounting of the actuating heads ...........................3
3.5 Actuation of the position switches ..........................4
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.......................................5
5.2 Maintenance ..........................................5
6 Disassembly and disposal
6.1 Disassembly...........................................5
6.2 Disposal ..............................................5
7 Appendix
7.1 EC Declaration of conformity ..............................6
x.000 / 03.2015 / v.A. - 101185192-EN / H / 2015-03-12 / AE-Nr. 4465
EN Operating instructions. . . . . . . . . . . . .pages 1 to 6
Translation of the original operating instructions

2
Operating instructions
Position switches EX-Z/T 355
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 355-➂Z➃-➄-➅-➆-3G/D
No. Option Description
➀
ZSnap action A
T Slow action A
➁
Actuator selection, refer to catalogue
➂
11 1 NO Contact / 1 NC contact
02 2 NC contacts
20 2 NO
01/01 1 NC contact to the left / 1 NC contact to the right
12 1 NO contacts / 2 NC contacts
03 3 NC
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 Destination and use
The position switches are suitable for sliding and hinged guards in
explosive atmospheres of Zone 2 and 22, category 3GD, which need
to be closed in order to provide for the necessary operational safety.
The installation and maintenance requirements to the standard series
EN 60079 must be met.
The user must evaluate and design the safety chain in ac-
cordance with the relevant standards and the required safety
level.
Conditions for safe operation
Due to the specific impact energy, the components must be fitted with a
protection against mechanical stresses. The specific ambient tempera-
ture range must be observed. The user must provide for a protection
against the permanent influence of UV rays.
2.4 Technical data
Equipment category: L II 3GD
Ex protection: Ex nC IIC T5 Gc X;
Ex tc IIIC T90°C Dc X
Standards: IEC 60947-5-1; EN 60079-0; EN 60079-15;
EN 60079-31; BG-GS-ET-15
Design: EN 50041
Enclosure: light-alloy diecast, paint finish
Max. impact energy: 1 J
Actuating speed: max. 1 m/s
Protection class: IP67 to IEC 60529
Contact material: Silver
Contact type: change-over with double break Zb,
or 2 NC contacts, galvanically separated contact bridges
Switching system: A IEC 60947-5-1, slow or snap action,
positive break NC
Connection: screw terminals
Cable section: min. 0.75 mm², max. 2.5 mm²
(including conductor ferrules)
Cable entry: 3 x M20 x 1.5
Rated impulse withstand voltage Uimp: 6 kV;
-03Z, -12Z: 4 kV
Rated insulation voltage Ui: 500 V;
-03Z, -12Z: 250V
Thermal test current Ithe:10 A
Utilisation category: AC-15 / DC-13
Rated operating current/voltage Ie/Ue:4 A / 230 VAC
4 A / 24 VDC
Max. fuse rating: 6 A gG D-fuse
Ambient temperature: 
Mechanical life: 30 million operations
Switching frequency: max. 5000/h
Bounce duration: snap action: in accordance with actuating speed;
slow action: <2 m/s
Switchover time: snap action: <2 m/s;
slow action: in accordance with actuating speed
Cable cross-section: min. Ø 7 mm; max. Ø 12 mm
Cable glands: L II 2GD
Tightening torque
- Cover screws: min. 1.0 Nm
- Cable gland: min. 8 Nm
2.5 Safety classification
Standards: ISO 13849-1
B10d (NC contact): 20,000,000
B10d (NO contact)
at 10% ohmic contact load: 1,000,000
Service life: 20 years
MT
TF
Bdxx
hs/h3600
d
10d op op
op
n
0,1 x nop tcycle
(Specifications can vary depending on the application-specific parame-
ters hop, dop, tcycle as well as the load.)

3
EX-Z/T 355
Operating instructions
Position switches
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 moun-
ting 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 remarks of the standards ISO 12100,
EN 953 and ISO 14119.
3.2 Dimensions
All measurements in mm.
Position switches EX-Z/T 355
7,3
76
30,5
17
20
38
¤ 25
5,3
40-46
66,5
66,7
55,7
45
23
3.3 Settings
Changing the switching function (4VH, 4V7H, 4V10H)
Position switches with "4V" actuating head can be set so that they are
switched either only clockwise, only counterclockwise or in both direc-
tions. The following steps are required:
1. Unscrew the retaining screws and remove the actuating head
2. Change the position of both inner plastic parts
3. Replace the actuating head and tighten the screws
Changing the switching function
switching in both directions
switching only clockwise
switching only counterclockwise
3.4 Mounting of the actuating heads
Repositioning the actuating head (R, K, 1K, V, 4V.H)
The actuating head can be repositioned by 4 x 90°. Unscrew the
four screws of the actuating head (Philips tip profile), reposition the
actuating head in the desired position and retighten the four screws
(tightening torque 1.5 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.

4
Operating instructions
Position switches EX-Z/T 355
EN
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 7 H or 10 H actuator are not suitable
for safety functions. Ordering suffix for actuator 7H with positi-
ve break: -2138.
3.5 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 autho-
rised 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 compart-
ment.
4.2 Contact variants
Contacts are shown with safety guard closed.
1 NO contact / 1 NC contact 2 NC contact
EX-Z/T 355-11Z-3G/D EX-Z/T 355-02Z-3G/D
13
21
14
22
A
11
21
12
22
A
A
2 NO contact 1 NO contact /
2 NC contacts
EX-Z/T 355-20Z-3G/D EX-Z/T 355-12Z-3G/D
13
23
14
24
13
21
31
14
22
32
A
A
3 NC contact
EX-Z/T 355-03Z-3G/D
11
21
31
12
22
32
A
A
A
Position switches with two NO contacts (-20) are not suitab-
le for safety functions.

5
EX-Z/T 355
Operating instructions
Position switches
EN
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.
Adequate measures must be taken to ensure protection
against tampering either to prevent tampering of the safety
guard, for instance by means of replacement actuators.
Damaged or defective components must be replaced.
6. Disassembly and disposal
6.1 Disassembly
The safety switchgear must be disassembled in a de-energised condi-
tion only.
6.2 Disposal
The safety switchgear must be disposed of in an appropriate manner in
accordance with the national prescriptions and legislations.

6
Operating instructions
Position switches EX-Z/T 355
EN
EX-ZT355-C-EN
7. Appendix
The currently valid declaration of conformity can be down-
loaded from the internet at www.schmersal.net.
7.1 EC Declaration of conformity
Name of the component / type: EX-Z/T 355
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 func-
tions or position switch without safety function
Relevant EC-Directives: 2006/42/EC EC-Machinery Directive1)
94/9/EC EC-Explosion Protection Directive (ATEX)
 1) for safety components, whose type plate is
labelled "safety component"
2) for position switches without safety function
Used harmonized standards: IEC 60947-5-1,
EN 60079-0, EN 60079-15, EN 60079-31
Person authorized for the compilation of
the technical documentation:
Oliver Wacker
Möddinghofe 30
42279 Wuppertal
K.A. Schmersal GmbH & Co. KG
Möddinghofe 30, D - 42279 Wuppertal
Postfach 24 02 63, D - 42232 Wuppertal
Phone: +49 - (0)2 02 - 64 74 - 0
Telefax: +49 - (0)2 02 - 64 74 - 1 00
E-Mail: [email protected]
Internet: http://www.schmersal.com
Place and date of issue: Wuppertal, December 10, 2014
Authorised signature
Philip Schmersal
Managing Director
EC Declaration of conformity
K.A. Schmersal GmbH & Co. KG
Möddinghofe 30
42279 Wuppertal
Germany
Internet: www.schmersal.com
We hereby certify that the hereafter described products both in their basic design and construction
conform to the applicable European Directives.
Translation of the original
Declaration of Conformity