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© PHOENIX CONTACT 2014-08-19103753_en_00 MACX MCR-EX-SL-2NAM-T(-SP) Data sheet 1D e s c r i p t i o n The 2-channel NAMUR signal conditioner MACX MCR-EX-SL-2NAM-T(-SP) has been designed for intrinsically safe operation of proximity sensors (as per EN 60947-5-6 (NAMUR)) as well as switch contacts, with open circuit and resistance circuits, installed in hazardous areas. The input circuits are monitored for line faults such as wire breaks and short circuits. Line fault detection (LFD) can be activated and deactivated. Errors are indicated by a red flashing LED (as per NAMUR NE 44) and the corresponding transistor output is blocked. Error messages can also be transmitted to the supply and error evaluation module via the DIN rail connector. The output circuits feature one passive transistor for each channel for the transmission of the switching signal to the control level. The switches make it possible to set the direction separately for every channel (open or closed circuit current behavior). The status of the respective channel is signaled via a yellow LED. Certified for safety-related applications up to SIL 2 according to IEC/EN 61508.
1.1 Properties
– Two-channel – Intrinsically safe input for NAMUR proximity switches or contacts, [Ex ia] – Transistor output, (passive), up to 5 kHz – Line fault detection (LFD) – Option of phase reversal – Safe 3-way electrical isolation – SIL 2 acc. to IEC/EN 61508 – Installation in zone 2 permitted – Power supply and error indication possible via DIN rail connector – Plug-in terminals with screw connection (MACX MCR-EX-SL-2NAM-T) or spring connection (push-in) (MACX MCR-EX-SL-2NAM-T-SP) – Housing overall width 12.5 mm WARNING: Explosion hazard The module is an item of associated electrical equipment for intrinsically safe circuits. It is designed for use in zone 2, if specific conditions are observed. When installing and operating the device, the applicable safety directives (including national safety directives), accident prevention regulations, as well as general technical regulations must be observed. WARNING: Explosion hazard Observe the safety regulations and installation notes on page 6. Make sure you always use the latest documentation. It can be downloaded at phoenixcontact.net/products This data sheet is valid for all products listed on page 3. NAMUR signal conditioner, Ex-i, 2-channel, with transistor output
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3 Technical Data
Description Type Order no. Pcs. / Pkt. NAMUR signal conditioner, Ex-i, 2-channel, with screw connection MACX MCR-EX-SL-2NAM-T 2865489 1 NAMUR signal conditioner, Ex-i, 2-channel, with spring connection MACX MCR-EX-SL-2NAM-T-SP 2924090 1 Accessories Description Type Order no. Pcs. / Pkt. DIN rail connector (T-BUS), 5-pos., for bridging the supply voltage, can be snapped onto NS 35 DIN rail in acc. with EN 60715 ME 6.2 TBUS-2 1.5/5-ST-3.81 GN 2869728 10 Power and error evaluation module, including the corresponding DIN rail connector ME 17.5 TBUS 1.5/5-ST-3.81 GN Screw connection spring connection MACX MCR-PTB MACX MCR-PTB-SP 2865625 2924184 For additional accessories, please refer to the catalog from Phoenix Contact. Input Input Intrinsically safe, designed for protection type Ex-i [Ex ia] IIC/IIIC CAT II (250 V against 6) Available input sources – NAMUR proximity switches according to EN 60947-5-6 or – Switch contacts wi th open circuit (not for safety-related applications, SIL 2) or – Switch contacts with resistance circuit Switching hysteresis Approx. 0.2 mA Off-load voltage 8 V DC ±10% Switching points in acc. with IEC/EN 60947-5-6 I < 1.2 mA (blocking) I > 2.1 mA (conductive) Line fault detection Break 0.05 mA < IIN < 0.35 mA Short circuit 100 < RSensor < 360 Activated/Deactivated by DIP switches Switching output Switching output 1 Transist or, passive (per channel) CAT II (250 V against 6) Maximum switching voltage 30 V DC Minimum switching voltage 3 V DC Maximum switching current 50 mA, short-circuit-proof Minimum switching current 5 mA, short-circuit-proof Drop (ΔU) < 1.4 V Switching behavior Can be inverted by DIP switches Switching frequency 5 kHz General data Current consumption < 34 mA (24 V DC) Power dissipation 1 W Status indicator Green LED (PWR, supply voltage) Red LED (LE, line fault) Yellow LED (OUT, switching state) Housing material Polyamide PA 66-FR
MACX MCR-EX-SL-2NAM-T(-SP) 103753_en_00 PHOENIX CONTACT 4 Color Green Degree of protection IP20 Width x height x depth 12.5 mm x 112.5 mm 114.5 x mm (MACX MCR-EX-SL-2NAM-T) 12.5 mm x 116 mm 114.5 x mm (MACX MCR-EX-SL-2NAM-T-SP) Inflammability class according to UL 94 0 V Design Terminal housing for mounting on DIN rails General data (continued) Electrical isolation Input/Output 375 V peak (peak value acc. to EN 60079-11) Input/Power supply, DIN rail connector 375 Vpeak (peak value acc. to EN 60079-11) Input/Output/Power supply, DIN rail connector 300 Veff rated insulation voltage (Surge voltage category II, pollution degree 2, safe electrical isolation as per EN 61010-1) Test voltage 2.5 kV AC (50 Hz, 1 min) Output 1 / Output 2 50 Veff rated insulation voltage (surge voltage category II, pollution degree 2, basic insulation acc. to EN 61010-1) Test voltage 1.0 kV AC (50 Hz, 1 min) Ambient conditions Ambient temperature Operation Storage/Transport -20 °C ... +60 °C (any mounting position) -40 °C ... +80 °C Permissible humidity (operation) 10% ... 95% (non-condensing) Maximum altitude 2000 m above sea level Connection data MACX MCR-EX-SL-2NAM-T MACX MCR-EX-SL-2NAM-T-SP Connection method Screw connect ion Push-in spring connection Conductor cross-section solid flexible AWG/kcmil 24 ... 14 24 ... 16 Stripping length 7 mm 8 mm Conformance EMC Directive 2004/108/EC EN 61000-6-2, EN 61000-6-4, EN 61326-1 Ex Directive (ATEX) EN 60079-0, EN 60079-11, EN 60079-15 Safety data according to ATEX for intrinsically safe circuits Voltage, maximum Vo 9.6 V Maximum current Io 10.3 mA Maximum power Po 25 mW Maximum inner inductance Li Maximum inner capacity Ci negligible 11 nF Gas group IIC IIB Maximum external inductance Lo 100 mH 5 mH 1 mH 10 µH 100 mH 5 mH 1 mH 10 µH Safety-related maximum voltage Vm 253 V AC (125 V DC)
MACX MCR-EX-SL-2NAM-T(-SP) 103753_en_00 PHOENIX CONTACT 5 Approvals ATEX IBExU 08 ATEX 1100 II (1) G [Ex ia Ga] IIC II (1) D [Ex ia Da] IIIC II 3 G Ex nA IIC T4 Gc X IECEx approval IECEx IBE 08.0005X [Ex ia Ga] IIC [Ex ia Da] IIIC Ex nA IIC T4 Gc UL, USA/Canada , C.D.-No 83104549; IS for Class I,II,III, Division 1 and Zone 0; Installation in Class I, Division 2 and Zone 2 Functional safety (SIL) SIL 2 according to IEC/EN 61508
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4 Safety regulations and installation notes
4.1 Installation notes
– The device is an item of associated equipment (category 1) with “intrinsic safety” protection type and can be installed in zone 2 potentially explosive areas as a category 3 device. It meets the requirements of EN 60079-0:2012, IEC 60079-0 Ed. 6.0, EN 60079-11:2012, IEC 60079-11 Ed. 6.0 EN 60079-15:2010, IEC 60079-15 Ed. 4.0 Installation, operation, and maintenance may only be carried out by qualified electricians. Follow the installation instructions as described. When installing and operating the device, the applicable regulations and safety directives (including national safety directives), as well as general technical regulations, must be observed. For the safety data, refer to this document and the certificates (EC examination certificate and other approvals if appropriate). – Do not open or modify the device. Do not repair the device yourself; replace it with an equivalent device instead. Repairs may only be carried out by the manufacturer. – The IP20 degree of protection (EN/IEC 60529) of the device is intended for use in a clean and dry environment. Do not subject the device to mechanical or thermal loads that exceed the specified limits. – The device complies with the EMC regulations for industrial areas (EMC class A). When using the device in residential areas, it may cause radio interference.
4.2 Intrinsic safety
– The device is approved for intrinsically safe (protection type Ex i) circuits up to zone 0 (gas) and zone 20 (dust) in the hazardous area. Observe the safety values for intrinsically safe equipment and the connecting cables during connection (IEC/EN 60079-14). They must conform to the values specified in the installation manual, in this data sheet, or the EC-type examination certificate. – When carrying out measurements on the intrinsically safe side, observe the relevant regulations regarding the connection of intrinsically safe equipment. In intrinsically safe circuits, only use those measuring devices that are approved for these circuits. – If the device has been used in non-intrinsically safe circuits, it must not be used again in intrinsically safe circuits. The device must be clearly marked as non- intrinsically safe.
4.3 Installation in the hazardous area (zone 2)
– Observe the specified condit ions for use in potentially explosive areas! Install the device in a suitable approved housing (with at least IP54 degree of protection) that meets the requirements of EN 60079-15. Observe the requirements of EN 60079-14. – Always disconnect the power before connecting or disconnecting non-intrinsically safe cables. – In potentially explosive area s, always disconnect the power before snapping the device on or off the DIN rail connector. – The device must be stopped and immediately removed from the hazardous area if it is damaged or was subjected to an impermissible load or stored incorrectly or if it malfunctions.
4.4 Areas with a danger of dust explosions
– The device is not designed for installation in zone 22. – If, however, you wish to use the device in zone 22, it must be installed in a housing that complies with IEC/EN 60079-31. In doing so, observe the maximum surface temperatures. Observe the requirements of IEC/EN 60079-14. – Connection to the intrinsically safe circuit in areas with a danger of dust explosions (Zone 20, 21 or 22) is only permitted if the equipment connected to this circuit is approved for this zone (e.g. Category 1D, 2D or 3D).
4.5 Safety-related applications (SIL)
When using in safety-related applications, observe the instructions in Section 8, as the requirements differ for safety-related functions.
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5 Installation
5.1 Connection notes
– Near the device, provide a switch/circuit breaker that is labeled as the disconnect device for this device (or the entire control cabinet). –P r o v i d e overcurrent safety equipment (I 16 A) in the installation. – To protect the device against mechanical or electrical damage, install it in a suitable housing with an appropriate degree of protection according to IEC 60529. –I f several devices are installed next to each other, make sure that the device has a housing that features a basic insulation for 300 V eff. Install additional insulation, if necessary. If the neighboring device is equipped with basic insulation, no additional insulation is required. – The voltages present at th e input, output, and supply are extra-low voltages (ELV). Depending on the application, hazardous voltage (> 30 V AC) to ground may occur. For this event, safe electrical isolation from the other connections has been implemented. – Before performing any servicing or maintenance work, ensure that the device is disconnected from all effective power sources. – Always disconnect the device from the power before switching the DIP switches. – If the device is not used as described in the documentation, the intended protection may be impaired.
5.2 Electrostatic discharge
5.3 Design
Figure 1 Design MACX MCR-EX-SL-2NAM-T(-SP) WARNING: Electrical danger due to improper installation Observe the connection notes for safe installation in accordance with EN/UL 61010-1: NOTE: Electrostatic discharge! The device contains components that can be damaged or destroyed by electrostatic discharge. When handling the device, observe the necessary safety precautions against electrostatic discharge (ESD) according to EN 61340-5-1 and IEC 61340-5-1.
1 Plug-in COMBICON screw or push-in connectors with
2 LED PWR green Supply voltage
3 LED LF1 red Line fault, sensor cable 1
4 LED LF2 red Line fault, sensor cable 2
5 LED OUT1 yellow Switching state, transistor output
6 LED OUT2 yellow Switching state, transistor output
7 Switch DIP1 ... DIP4
8 Snap-on foot for fixing to the DIN rail
9 Connection option for DIN rail connector
1.1 1.2 2.1 2.2 3.1 3.2 4.1 4.2 5.1 5.2 MACX MCR-EX-SL-2NAM-T-SP I II 3.1 3.2 2.1 2.2 1.1 1.2 PWR LF1 LF2 OUT1 OUT2 1.1 1.2 2.1 2.2 3.1 3.2 4.1 4.2 5.1 5.2 MACX MCR-EX-SL-2NAM-T I II 1 1 3.1 3.2 2.1 2.2 1.1 1.2
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5.4 Basic circuit diagram
Figure 2 Basic circuit diagram with connection terminals
5.5 Inputs (intrinsically safe)
Connection of NAMUR proximity switches or (resistance) switch contacts
5.6 Outputs
One passive transistor each
5.7 Supply voltage
The modules can be supplied with voltage via the connection terminals as well as via the DIN rail connector. Supply via connection terminals The supply voltage is fed in through the connection t e r m i n a l s 1 . 1( + ) a n d 1 . 2( - ) . Supply via DIN rail connector The supply voltage can be fed in via an MACX MCR-EX-SL module or via the power and fault signaling module MACX MCR-PTB(-SP) to the DIN rail connector. – Supply via an MACX MCR-EX-SL module If the total current consumption of the modules in series does not exceed 400 mA, power can be supplied directly at the connection terminals of the module. Up to 16 modules can be supplied depending on the current consumption of the modules. We recommend connecting a 630 mA fuse (normal- blow or slow-blow) upstream. – Supply via the power and fault signaling module MACX MCR-PTB(-SP) The supply voltage is supplied via the MACX MCR-PTB(-SP) module to the DIN rail connector. Simple or redundant diode-decoupled power supply is possible. The MACX MCR-PTB(-SP) module is protected by a fuse. Depending on the current consumption of the modules, up to 150 individual modules can be supplied. The module has integrated error evaluation. An auxiliary supply failure or fuse fault is indicated at a relay output and displayed via a flashing LED. Channel 1 Terminals 4.1 (+) and 4.2 (-) Channel 2 Terminals 5.1 (+) and 5.2 (-) Channel 1 Terminals 3.1 (+) and 3.2 (-) Channel 2 Terminals 2.1 (+) and 2.2 (-) Zone 0,1,2 Zone 20,21,22 Div. 1,2 Sensor / Field PLC / DCS 3.2 3.1 CH1 2.2 2.1 CH2 IN Zone 2 Div. 2 OUT GND +24V 4.2 4.1 3.2 3.1 1.2 1.1 - - Power Faultsignal GND +24VLFD 2.2 2.1 5.2 5.1+ CH1 CH2 DI NOTE: Never connect the supply voltage directly to the DIN rail connector. Drawing power from the DIN rail connector is not permitted.
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5.8 Dimensions
Figure 3 Dimensions (in mm)
5.9 Assembly
Figure 4 Assembly and Removal
- Mount the module on a 35 mm DIN rail according to EN 60715.
- When using the DIN rail connector, first place it into the DIN rail (see A – C, Figure 4). It is used to bridge the voltage supply and for error messages. Please also observe the direction of the module and DIN rail connector when snapping into position: Snap-on foot below and connector left.
- Install the module in suitable housing to meet the requirements for the protection class. 116 (SP) 112,5 12,5 7 114,5 A B C
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5.10 Connecting the cables
- Strip the wire by approximately 7 mm and crimp ferrules to the end of the wires.
- Insert the conductor into the corresponding connection terminal.
- Use a screwdriver to tighten the screw in the opening above the connection terminal. Connection torque: 0.6 Nm Spring connection (push-in connection) Figure 6 Push-in connection
- Strip the wire by approximately 8 mm and crimp ferrules to the end of the wires.
- Insert the wire into the round opening of the terminal without using a tool.
- Push in the pushbutton with a screwdriver to release.
5.11 Group error message
Line fault messages from NAMUR signal conditioners that are connected via DIN rail connectors are signaled as a group error message from the power and fault signaling module MACX MCR-PTB(-SP) via a relay output and indicated by a flashing LED.
5.12 Startup
- Before startup, check that the NAMUR signal connector Ex is wired correctly, in particular with regard to the wiring and marking of the intrinsically safe circuits. 0,5-0,6 Nm 5-7 lb In 7 mm AWG 24-14 0,2-2,5 mm 2MACX MCR-... A B A A B 8 mm AWG 24-16 0,2-1,5 mm 2MACX MCR-...-SP
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6 Configuration
In the default state upon delivery, all DIP switches are set to the position "I".
6.1 Line fault detection (switch DIP2/DIP4)
Line fault detection is activated and deactivated by the switches DIP2 (for channel 1) and DIP4 (for channel 2). If line fault detection is activated, the transistor is disabled if a line fault occurs. The red LED (LF) flashes (NAMUR NE 44). If the module is connected to a power module MACX MCR-PTB(-SP) via a DIN rail connector, a group error message is also sent to the higher-level evaluation unit via floating relay output (see Chapter 5.11).
6.2 Phase reversal (switch DIP1/DIP3)
The phase reversal function is activated and deactivated by the switches DIP1 (for channel 1) and DIP3 (for channel 2). NOTE: Always disconnect the device from the power before switching the DIP switches. Channel 1 Channel 2 DIP1 DIP3 = I Normal phase (operating current behavior) DIP1 DIP3 = II Inverse phase (closed circuit current behavior) DIP2 DIP4 = I Line fault detection disabled * (not permitted for safety-related applications, SIL 2) DIP2 DIP4 = II Line fault detection enabled PWR = Supply voltage OUT = Switching state of the transistor LF = Line fault on the sensor cable WARNING: For safety-related applications, only the switch position "DIP2/DIP4=II" is permitted! Operating range according to EN 60947-5-6 for signaling the line fault. – Line break 0.05 mA < I IN < 0.35 mA – Short circuit 100 < RSensor < 360 PWR LF1 LF2 OUT1 OUT2 1.1 2.1 2.2 3.1 3.2 4.1 4.2 5.1 5.2 MACX MCR-EX-SL-2NAM-T II I NOTE: For switch contacts with open circuit (Figure 7), line fault detection (DIP2/DIP4 = I) has to be disabled or the corresponding resistance circuit has to be provided directly at the switch contact (Figure 8, e.g. UKK 5-2R/NAMUR (Order No. 2941662) with D–UKK 3/5 (Order No. 2770024)). Figure 7 Switch contact with open circuit (not permitted for safety-related applications, SIL 2) Figure 8 Switch contact with resistance circuit Channel 1 Channel 2 DIP1 DIP3 = I Normal phase DIP1 DIP3 = II Inverse phase Transistor Normal phase (I) Inverse phase (II) Conductive if I > 2.1 mA I < 1.2 mA Blocking if I < 1.2 mA I > 2.1 mA 10 kΩ 1 kΩ
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6.3 Truth table
WARNING: For safety-related applications, only the switch position "DIP2/DIP4=II" is permitted! WARNING: Apart from NAMUR sensors, only switches with resistance circuit are permitted at the input for safety-related applications (see Figure 8). Sensor in input Input circuit DIP switches Output Transistor LED OUT LF LED Permitted for safety-related
applications
Switch NAMUR State 1 2 3 4 yellow red Open Blocking OK I I I I Blocking no Closed Conductive OK I I I I Conductive X no Open Blocking OK II I II I Blocking X no Closed Conductive OK II I II I Conductive no Blocking OK I II I II Blocking yes Conductive OK I II I II Conductive X yes Any Open circuit I II I II Blocking X yes Any Short circuit I II I II Blocking X yes Blocking OK II II II II Conductive X yes Conductive OK II II II II Blocking yes Any Open circuit II II II II Blocking X yes Any Short circuit II II II II Blocking X yes PWR LF1 LF2 OUT1 OUT2 1.1 1.2 2.1 2.2 3.1 3.2 4.1 4.2 5.1 5.2 MACX MCR-EX-SL-2NAM-T II I DIP2/DIP4 = I Line fault detection disabled (not permitted for safety-related appli- cations, SIL 2) DIP2/DIP4 = II Line fault detection enabled DIP1/DIP3 = I Normal phase DIP1/DIP3 = II Inverse phase LED PWR = Supply voltage LED OUT = Switching st ate of the transistor LED LF = Line fault on the sensor cable
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7 Comparison of safety data
Provide proof of intrinsic safety according to standard IEC/EN 60079-14 and other national standards and installation specifications, if applicable. Safety data for the The values for Vo, Io, Po, Lo, and Co can be found under “Safety data according to ATEX for intrinsically safe circuits” on page 4. Example for proof of intrinsic safety (simple circuit) Vi ≥ Vo Ii ≥ Io Pi ≥ Po Li + Lc ≤ Lo Ci + Cc ≤ Co Lc and Cc depend on the cables/lines used. WARNING: Explosion hazard Compare the safety data before connecting a device located in the Ex-i area to the MACX MCR-EX-SL-2NAM-T(-SP). Field devices: V i, Ii, Pi, Li, Ci Ex i NAMUR signal conditioner: V o, Io, Po, Lo, Co
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8 Safety-related applications (SIL 2)
SIL regulations apply to the following modules: A hardware assessment (FMEDA report) is available for the aforementioned safety-related NAMUR signal conditioners: Exida_07/06-39_R006_V1R2.
8.1 Circuits
Permitted for safety-related applications: – NAMUR sensor (according to EN 60947-5-6) – Switch contact with resistance circuit (1 k serial and 10 k parallel (tolerance ±10%)) (Note: The resistance circuit regulates the behavior of a NAMUR sensor) Output The safety-related function at the output is dependent on the position of the switches DIP1 (for channel 1) and DIP3 (for channel 2).
8.2 Diagnostics functi on via the switches
For safety applications, line fault detection is enabled, i.e., the DIP2/DIP4 switches are in the "II" position. When line fault detection is enabled, the red LED indicates any faults that occur. If a line fault is detected, the output is disabled ("non-conductive"). This behavior is not dependent on the position of the DIP1 and DIP3 switches.
8.3 Safe state
The "safe state" means that the output is in a non- conductive state, i.e., the transistor is blocking.
8.4 Response Times
Following a state change at the input, the output enters the safe state in ≤ 0.2 ms.
8.5 Operating mode of the safety function
Operating mode according to IEC/EN 61508: "Low demand mode".
8.6 Failure behavior and required response
- The safe state is entered in the event that a line fault is detected or the supply voltage fails (see Section 8.3). 2. The safe state is reached by removing the connection terminals. Designation Order no. MACX MCR-EX-SL-2NAM-T 2865489 MACX MCR-EX-SL-2NAM-T-SP 2924090 MACX MCR-SL-2NAM-T 2865036 MACX MCR-SL-2NAM-T-SP 2924281 WARNING: Switch contacts without resistance circuit are not permitted for safety-related applications. I = Normal operation In the event of a 0 signal (NAMUR sensor high resistance, therefore lower current in the input circuit), the output (transistor) switches to the "non-conductive" state. II = Inverse operation In the event of a 1 signal at the input, the output switches to the "non-conductive" state. WARNING: The "DIP2/DIP4 = I" switch position is not permitted for safety-related applications.
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8.7 Safety integrity requirements
– Type A device (according to IEC/EN 61508-2) – Safety Integrity Level (SIL) 2 –H F T = 0 – MTTR = 24 h – 1oo1 structure Non-inverted operation: The MTBF is 269 years. PFD avg values Inverted operation: The MTBF is 269 years. PFDavg values The box marked in white shows that the calculated PFDavg values are within the permissible range for SIL2 in accordance with Table 2 of IEC/EN 61508-1. However, they do not fulfill the requirement to not cover more than 10% of this safety circuit, i.e., to be better than or equal to 1.00 E03. The boxes marked in gray show that the calculated PFDavg values are within the permissible range for SIL 2 in accordance with Table 2 of IEC/EN 61508-1. They fulfill the requirement to not cover more than 10% of the safety circuit, i.e., to be better than or equal to 1.00E-03. Failure limit The operating mode is based on low demand mode. The device covers less than 10% of the PFH/PFD of the entire safety circuit. Figure 9 Safety circuit
8.8 Conditions
– The failure rates of the components used remain constant throughout the period of use. – The propagation of errors by the device in the system is not taken into consideration. – The repair time (replacement) should be eight hours. – The failure rates of the external power supply are not taken into consideration. – Line fault detection is enabled. – The average temperature at which the device is to be used is +40 °C. In this case, normal industrial conditions are assumed. The specified error rates are based on an average ambient temperature of +40 °C. For an average ambient temperature of +60 °C, the specified failure rates must be multiplied by a factor of 2.5. This factor is based on guide values. λSD λSU λDD λDU SFF DCS DCD 12 FIT 251 FIT 15 FIT 64 FIT 81% 4.5% 18.9% T[PROOF] = 1 year 2 years 5 years PFDavg = 2.80E-04 5.61E-04 1.40E-03 λSD λSU λDD λDU SFF DCS DCD 2 FIT 262 FIT 12 FIT 64 FIT 81% 0% 15.7% T[PROOF] = 1 year 2 years 5 years PFDavg = 2.80E-04 5.61E-04 1.40E-03 Sensor 25% Device < 10% Processing 15% Actuator 50%
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8.9 Installation and Startup
During installation, also follow the installation notes, which pertain to delivery of the device. (PACKB. MACX MCR-EX- SL-2NAM-T(-SP), MNR 9040239). They can also be downloaded at phoenixcontact.net/products.
- Configure the device according to its safety requirements based on the truth table on page 12. Observe the non-approved switch positions for safety- related applications.
- Connect the NAMUR signal conditioner according to the installation manual.
- Check the functionality of the NAMUR signal conditioner with connected sensor or switch contacts with resistance circuit for correct function.
- Start up the safety circuit and check that it operates correctly.
8.10 Notes on operation
During normal operation, the green (PWR) LED is always on. The yellow LEDs (OUT1/OUT2) indicate the switch condition of the output transistor. The red LEDs indicate if there is a line fault when the line fault detection is enabled. The safe state is entered in the event that a line fault is detected or the supply voltage fails.
8.11 Startup and restart
Startup or restart of the device Behavior: The output enters the state without oscillation (according to the truth table on page 12). A reset is not re- quired. What happens when a line fault is detected and what must the user do? Behavior: The fault is indicated by the red LED and the out- put enters the "non-conductive" state regardless of the input signal and the operating mode (normal or inverse mode). The user has to eliminate the line fault (short circuit or break in the sensor cable). The device output is not blocked when fault detection is trig- gered (no lock or reset). Undefined line states that occur during repairs can switch the output. The user must prevent this from happening by disconnecting the supply voltage or removing the connection terminals. Other options that have the same result and do not present an additional hazard are also permitted. The line fault is removed. Behavior: The user has to ensure that a defined state is en- tered using the truth table on page 12. The device is re- started in the same way as during initial startup. The device then behaves as described under „Startup or restart of the device“.
8.12 Recurring checks
- Check the function of the entire safety circuit according to IEC/EN 61508 and EN 61511. The intervals for checking are specified by the intervals of each individual device within the safety circuit. It is the operator's responsibility to select the type of checks and the checking intervals in the specified time period. Checking must be carried out in such a way that the correct function of the safety equipment in conjunction with all components can be verified. Possible procedure for recurring checks for discovering dangerous and undetected device failures 1. Apply an appropriate signal at the input of the NAMUR signal conditioner in order to obtain the non-conductive state at the output. Check whether the output is non- conductive. 2. Check the conduc ting status in the same manner. 3. Restore the safety circuit to full functionality. 4. Resume normal operation. With this test around 99% of the possible "du" ("dangerous undetected") errors in the NAMUR signal conditioner are discovered. If the function test result is negative, the device must be taken out of operation and the process put into a safe state by other measures. NOTE: Installation, operation, and maintenance may only be carried out by qualified electricians.
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8.13 Repair
The devices have a long service life, are protected against malfunctions, and are maintenance-free. However, if a device should fail, send it back to Phoenix Contact. The type of malfunction and possible cause has to be stated. Please use the original packaging or other suitable safe packaging when sending devices back for repairs. Phoenix Contact GmbH & Co KG Abteilung Service und Reparatur Flachsmarktstr. 8
32825 Blomberg
8.14 Standards (SIL 2)
The devices are developed and tested according to the following standards: IEC/EN 61508:2001 Function al safety of electri- cal/electronic/programmable elec- tronic safety-related systems EN 61326-1:2006 Electrical equipment for measure- ment, control and laboratory use - EMC requirements
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8.15 Abbreviations
Diagnostic coverage of safe failures (DCS) or dangerous failures (DCD) FIT Failure in time Number of failures that occur in 109 hours HFT Hardware Fault Tolerance Hardware fault tolerance: abil- ity of a function unit to continue with the execution of a de- manded function despite exist- ing faults or deviations MTBF Mean Time Between Failures Indicates the average time pe- riod between one failure and the next. This includes the length of time that the compo- nent functions for until the fail- ure and the downtime. MTTR Mean Time To Repair Indicates the average time needed in order to repair a faulty component. PFD avg Average Proba- bility of danger- ous Failure on Demand Average probability of failure on demand of a safety function PFH Probability of a Dangerous Fail- ure per Hour Probability of failure per hour for the safety function SFF Safe Failure Fraction Proportion of safe failures: Proportion of failures without the potential to set the safety- related system to a dangerous or impermissible function state SIL Safety Integrity Level IEC/EN 61508 defines four safety integrity levels (SIL 1 to 4). The higher the Safety Integ- rity Level of the safety-related system, the lower the probabil- ity range for the failure of a safety function. λ The failure rate λ indicates the number of errors per time unit. DD Dangerous Detected DU Dangerous Undetected SD Safe Detected SU Safe Undetected