Sensor systems 2 AS-Interface

Issue date 2004-11-19 - Catalogue AS-Interface 2004/2005
5.4 Ex Modules
AS-Interface - Ex Modules
In the G5 design there are Ex modules for Zone 1 of a hazardous area. The
master and power supply should either be located outside Zone 1, or
mounted in an approved Ex housing.
Wiring in Zone 1 is carried out with increased safety (EEx e). The AS-Interface
connection can occur over the flat cable (the VAZ-PG11-FKD cable entry
seal is also necessary) or round cable. Up to 4 NAMUR sensors can be
connected to the sensor input.
The module ist encapsulated (EEx m) and converts the intrinsically safe
NAMUR signal (EEx i) onto the AS-Interface The field circuits conform to ignition
protection class Ex ia IIC. The inputs are monitored for lead breakage
and short circuits (can be disabled for connection to mechanical contacts).
A version with 4 inputs and 2 outputs is available, as well as a version with
4 outputs; both have ATEX approval.
Instruction manual for the AS-Interface Ex system
1. Usage
I/O modules are used as measuring and control devices to transfer binary signals within
hazardous areas or from hazardous areas to non-hazardous areas.
The data sheets of the individual devices include the electrical data for the EC Type Examination
Certificate, and are considered an integral part of the operating manual.
The inputs and outputs conform to intrinsic safety ignition protection class "i", the bus to
increased safety protection class "e" and the coupling modules to protection class "encapsulated
housing m".
Conformance to the standards and regulations applicable to the specified or intended
usage should be ensured.
Devices which are operated in general electrical systems must not thereafter be operated
in electrical systems that are connected with areas subject to the danger of explosions.
I/O Modules are not suitable for the isolation of signals for power engineering. The manufacturer
data sheets should also be adhered to.
2. Commissioning, installation
(Commissioning and installation may only be performed by professionals specifically trained to
do so.)
The coupling modules conform to protection class IP54.
The coupling modules are suitable for installation in zone 1 of hazardous areas.
Intrinsically safe circuits (light blue identification on the device) may be led into hazardous
areas; in this case, particular care must be taken to ensure secure isolation from all nonintrinsically
safe circuits. Installation must be performed in accordance with applicable manufacturer
guidelines.
When using intrinsically safe circuits in Dust-Ex Zone "D", only field devices certified for this
use may be connected.
When conneting intrinsically safe field devices to the intrinsically safe circuits of the coupling
module, the respective peak values of the field device and I/O module with regard to
explosion protection are to be used (Proof of Intrinsic Safety). EN 60079-14/IEC 60079-14
should be observed. In the case of Germany the "National foreword" in DIN EN 60079-
14/VDE 0165 Part 1 must be observed.
The EU certificates of conformity or EU declarations of conformity should be observed. It is
particularly important to ensure that any "Special Conditions" in these documents are
adhered to.
Installation can be performed as direct walll mounting.
3. Maintenance
The long-term stability of the device transmission functions eliminates the need for regular
adjustment or similar intervention. No other maintenance is required.
4. Fault elimination
Devices operating in connection with hazardous areas must not be modified in any way.
Only qualified and authorised personnel are permitted to carry out device repairs.
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group Tel.: Germany +49 621 776-0 USA +1 330 4253555 Singapore +65 67799091 Internet http://www.pepperl-fuchs.com
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Masters and
Gateways
Power Supplies,
Extender, Repeaters
Safety at work
I/O Modules
Control cabinet
I/O Modules
Field application
Analogue modules
Other modules
Inductive sensors
Photoelectric
sensors
Rotary encoders
Accessories