IFM N0537A User manual

Operating instructions
Switching amplifiers
N0537A
N0538A
N0539A
80299364 / 0002 / 2021
GB

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Contents
1 Preliminary note ............................................................................................. 3
2 Safety instructions.......................................................................................... 3
3 Intended use .................................................................................................. 3
3.1 Classification........................................................................................... 4
3.2 ATEX certificate ...................................................................................... 4
3.3 IECEx certificate ..................................................................................... 4
3.4 Identification............................................................................................ 4
4 Installation...................................................................................................... 4
4.1 Requirements for cables and connection cables .................................... 5
4.2 Requirements in case of use as associated equipment.......................... 5
4.3 Requirements for use with equipment protection level Gc...................... 6
5 Electrical connection ...................................................................................... 6
6 Operating and display elements .................................................................... 7
7 Maintenance, repair and disposal .................................................................. 8

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1 Preliminary note
You will find instructions, technical data, approvals and further information using
the QR code on the unit / packaging or at www.ifm.com.
2 Safety instructions
• The unit described is a subcomponent for integration into a system.
– The system architect is responsible for the safety of the system.
– The system architect undertakes to perform a risk assessment and to create
documentation in accordance with legal and normative requirements to be
provided to the operator and user of the system. This documentation must
contain all necessary information and safety instructions for the operator,
the user and, if applicable, for any service personnel authorised by the
architect of the system.
• Read this document before setting up the product and keep it during the entire
service life.
• The product must be suitable for the corresponding applications and
environmental conditions without any restrictions.
• Only use the product for its intended purpose (Ò Intended use).
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property may occur.
• The manufacturer assumes no liability or warranty for any consequences
caused by tampering with the product or incorrect use by the operator.
• Installation, electrical connection, set-up, operation and maintenance of the
product must be carried out by qualified personnel authorised by the machine
operator.
• Protect units and cables against damage.
3 Intended use
The unit is used in instrumentation and control engineering (ICE) for galvanic
isolation of signals, such as 20mA and 10V standard signals, or in addition for
adapting and standardising signals. The unit features intrinsically safe circuits that
are used to operate intrinsically safe field units within hazardous areas.
The unit is intended for installation on a 35 mm DIN rail according to EN 60715.
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The unit is an associated equipment according to IEC/EN 60079-11.
The unit is not suitable for separating signals in power measurement technology.
The unit transmits binary signals of NAMUR sensors or mechanical contacts from
the hazardous area into the non-hazardous area.
uOnly use the unit within the permissible operating conditions.
uOnly use the unit stationary.
3.1 Classification
Use in hazardous areas according to the classification
II 3 (1) G (group II, category 1G / 2G, apparatus for gas atmosphere).
The requirements of the standards ENIEC 60079-0:2018, EN60079-11:2012,
EN60079-15:2010 are met.
II (1) D (group II, category 1D, apparatus for dust atmosphere).
The requirements of the standards ENIEC 60079-0:2018 and EN60079-11:2012
are met.
3.2 ATEX certificate
FIDI 20 ATEX 0022X
3.3 IECEx certificate
IECEx FIDI 20.0003X
3.4 Identification
ATEX classification Identification
II 3 (1) G Ex nA [ia Ga] IIC T4 Gc
II (1) D [Ex ia Da] IIIC
I (M1) [Ex ia Ma] I
4 Installation
uDo not install a damaged or dirty unit.
uDo not expose the unit to mechanical hazard,
Recommendation: Installation in a secondary housing.

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uInstall the unit outside the hazardous area.
The unit has the protection rating IP20 according to IEC/EN 60529.
uOnly install and use the unit under operating conditions that do not exceed
soiling degree 2 according to IEC EN 60664-1.
In case of use under operating conditions with a higher degree of soiling, the
unit must be protected accordingly.
uMake sure all circuits connected with the unit comply at least with overvoltage
category II according to IEC EN 60664-1.
uOnly supplies providing protection against electrical shock (SELV or PELV)
may be connected to supply modules.
uThe installation regulations according to IEC/EN 60079-14 must be complied
with,
4.1 Requirements for cables and connection cables
uThe permissible wire cross section must be adhered to. In case multi-wire
conductors are used, they have to be crimped with wire end ferrules.
uMake sure only one conductor per connecting terminal is used.
uMake sure the insulation of the conductor reaches all the way to the connecting
terminal.
uThe tightening torque for the screws of the connecting terminal must be
adhered to.
If the voltage exceeds 50VAC:
1. Switch off the voltage.
2. Attach or remove the terminal blocks.
4.2 Requirements in case of use as associated equipment
Circuits with Ex i type of protection that have been operated with non-intrinsically
safe circuits must no longer be used as circuits with Ex i type of protection then.
The intrinsically safe circuits of the associated equipment may be routed into
hazardous areas.
uMake sure the separation distances to all non-intrinsically safe circuits
according to IEC/EN 60079-14 are observed.
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uMake sure the separation distances between two neighbouring intrinsically safe
circuits according to IEC/EN 60079-14 are observed.
uIf the unit is connected to intrinsically safe equipment, the upper limiting values
of the unit must be observed.
uIf intrinsically safe units are connected to the intrinsically safe circuits of the
corresponding equipment, the respective upper limiting values consistent with
the explosion protection according to IEC/EN 60079-14 or IEC/EN 60079-25
must be observed (proof of intrinsic safety).
4.3 Requirements for use with equipment protection level Gc
The unit may only be installed and operated if installed in a secondary housing
that complies with the requirements according to IEC/EN 60079-0 and that has the
protection rating IP54 according to IEC/EN 60529.
When energised, non-intrinsically safe circuits may only be connected and
disconnected if there is no explosive atmosphere present.
5 Electrical connection
NAMUR switch
Mechanical switch
Input circuit no.
123
1 2 3
4 5 6
1 2 3
4 5 6
1 2 3
4 5 6
10 kΩ
10 kΩ
400 Ω ≤ R ≤ 2 kΩ
1 2 3
4 5 6
Maximum permissible values of the control circuits in type of protection intrinsic
safety
Voltage 10.5 V
current 17.1 mA

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Maximum permissible values of the control circuits in type of protection intrinsic
safety
Power 45 mW
External inductance 200 mH (IIC) / 740 mH (IIB)
External capacitance 2.4 µF (IIC) / 16.8 µF (IIB)
6 Operating and display elements
13
6
2
54
Ι ΙΙ
Ι ΙΙ
1: LED yellow Indication of the switching status output 1 / output 2;
lights when the corresponding output is switched / the relay is en-
ergised.
2: LED red Fault indication for input circuit 1 / input circuit 2;
lights in case of wire break or short circuit in the respective input
circuit. The corresponding output is not active (transistor blocked,
relay de-energised).
3: LED green Lights when supply voltage is applied.
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4: Selector switch S1 Programming the output function
S1 / S2 = 1: direct operation (output switches like input signal: IN =
ON ➔ OUT = ON).
S1 / S2 = 2: inverted operation (output switches opposed to the in-
put signal: (IN = ON ➔ OUT = OFF).
For single-channel units S2 has no function.
5: Selector switch S2
6: Selector switch S3 Setting for short circuit / wire monitoring
• When proximity sensors are connected monitoring is always
active. S3 must be in position I.
• When mechanical switches are connected the following applies:
– Monitoring active for input circuit no. 1; S3 must be in position
I.
– Without short circuit monitoring for input circuit no. 2 and S3
in position I.
– Without short circuit and wire monitoring for input circuit no. 3
and S3 in position II.
7 Maintenance, repair and disposal
The operation of the unit is maintenance-free.
Only the manufacturer is allowed to repair the unit.
uAfter use dispose of the device in an environmentally friendly way in
accordance with the applicable national regulations.