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03

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Z-System – Zener Barriers

Installation

3.2

Mounting

Mounting in the Non-Hazardous Area

Mounting the Device
Snap the device onto the DIN mounting rail. See figure below.

Mounting in Zone 2

For mounting in the hazardous area observe the following warning messages.

Mounting the Device
Snap the device onto the DIN mounting rail. See figure below.

Danger!

Explosion hazard from wrong mounting
Operating the device without a surrounding enclosure can cause sparks. This can 

ignite the surrounding potentially explosive atmosphere.
Mount the device in a surrounding enclosure that complies with 

IEC/EN 60079–0and that is rated with the degree of protection IP54 according to 

IEC/EN 60529.

CORRECT: Device snapped on from the side.

INCORRECT: Device snapped on vertically.

Figure 3.2

Summary of Contents for Z-System

Page 1: ...13 04 Липецк 4742 52 20 81 Магнитогорск 3519 55 03 13 Москва 495 268 04 70 Мурманск 8152 59 64 93 Набережные Челны 8552 20 53 41 Нижний Новгород 831 429 08 12 Новокузнецк 3843 20 46 81 Новосибирск 383 227 86 73 Орел 4862 44 53 42 Оренбург 3532 37 68 04 Пенза 8412 22 31 16 Пермь 342 205 81 47 Ростов на Дону 863 308 18 15 Рязань 4912 46 61 64 Самара 846 206 03 16 Санкт Петербург 812 309 46 40 Сарато...

Page 2: ... of Delivery for Products and Services of the Electrical Industry published by the Central Association of the Electrical Industry Zentralverband Elektrotechnik und Elektroindustrie ZVEI e V in its most recent version as well as the supplementary clause Expanded reservation of proprietorship Z System Zener Barriers ...

Page 3: ...2 2 3 Connections 12 2 4 Color Identification 13 2 5 Label Carrier 14 3 Installation 15 3 1 DIN Mounting Rail 15 3 2 Mounting 16 3 3 Connection 17 4 Operation 23 5 Maintenance Repair and Dismounting 24 6 Technical Specifications 25 6 1 Typical Characteristics 25 6 2 Technical Data 26 6 3 Order Designation 28 6 4 Dimensions 29 Functional Safety Manual KFD0 RSH 1 1D F1 KCD0 RSH 1 1D 1 ...

Page 4: ...unting and installation Commissioning and operation Maintenance and repair Troubleshooting Dismounting Disposal The documentation consists of the following parts Present document Instruction manual Datasheet Additionally the following parts may belong to the documentation if applicable EC type of examination EU declaration of conformity Attestation of conformity Certificates Control drawings Addit...

Page 5: ...mbols for the identification of warning messages and of informative messages Warning Messages You will find warning messages whenever dangers may arise from your actions It is mandatory that you observe these warning messages for your personal safety and in order to avoid property damage Depending on the risk level the warning messages are displayed in descending order as follows Danger This symbo...

Page 6: ...Barriers Introduction Informative Symbols Action This symbol indicates a paragraph with instructions You are prompted to perform an action or a sequence of actions Note This symbol brings important information to your attention ...

Page 7: ...nd DC intrinsic safety applications with over 75 different models 1 2 and 3 channel versions are available for quick and easy installation The zener barriers mount on 35 mm DIN mounting rail The process of mounting each barrier on the DIN mounting rail makes an electrical connection to the internal earth ground network necessary to maintain the intrinsic safety rating of the barrier Replaceable ba...

Page 8: ... current to the ground connection The fuse F opens to prevent the transfer of unacceptably high energy into the hazardous area The resistor R limits the current in the event of a short circuit in the hazardous area The dedicated grounding provides the necessary low resistance path for zener diode fault current ZD Zener diode R Current limiting resistor F Fuse Ground connection 1 Control circuit 2 ...

Page 9: ...spond to the zener voltage Uz and the total resistance of all zener barrier components The figures represent the safety values The values stated on the nameplate correspond to the worst case data for Uz Uo Voc and Ik Io Isc determined during certification Ik is obtained by dividing Uz by the resistance R Ideally zener diodes would not allow any current in the reverse direction until the zener volt...

Page 10: ...age under the value at which the diodes will start to conduct These voltages are stated in the datasheet for a given zener barrier together with the leakage current If the leakage current for a given voltage differs from 10 µA i e 1 µA this is specifically stated Figure 2 4 Leakage current through the zener diodes The following figure shows that if the maximum permissible input supply voltage is e...

Page 11: ...ers can be used in many applications In the simplest case a 1 channel zener barrier with a ground connection is used But in many applications it is not desirable that the intrinsically safe circuit is connected directly to ground If the circuit in the non hazardous area is grounded under some circumstances grounding of the intrinsically safe circuit can lead to faults within the system In this cas...

Page 12: ...ate up to 3 channels The zener barriers are epoxy filled Zener barriers are designed for degree of protection IP20 Figure 2 6 12 5 mm housing 2 3 Connections The terminals are designed as screw terminals The terminals offer a space for the connection of leads with core cross sections of up to 2 5 mm2 14 AWG 5 6 7 8 1 2 3 4 Note For more information see the corresponding datasheets ...

Page 13: ...lowing meaning Red 1 indicates DC devices with positive polarity Black 2 indicates DC devices with negative polarity Gray 3 indicates AC devices Blue 4 indicates the terminals of the field side hazardous area Figure 2 7 Color identification of devices 1 red 2 black 3 gray 4 blue 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 2 1 3 4 ...

Page 14: ...t Specifications 2 5 Label Carrier The device has a label carrier on the front side for individual marking Figure 2 8 Label carrier on the front side 1 Label ZH ES LB with labeling field 29 mm x 8 mm 2 Label carrier ZH Z BT 5 6 7 8 1 2 3 4 1 2 ...

Page 15: ...arriers Installation 2016 03 15 3 Installation 3 1 DIN Mounting Rail The devices are mounted on a 35 mm DIN mounting rail according to EN 60715 Figure 3 1 Example DIN mounting rail 35 mm x 15 mm Z System Zener Barriers ...

Page 16: ...ce Snap the device onto the DIN mounting rail See figure below Danger Explosion hazard from wrong mounting Operating the device without a surrounding enclosure can cause sparks This can ignite the surrounding potentially explosive atmosphere Mount the device in a surrounding enclosure that complies with IEC EN 60079 0and that is rated with the degree of protection IP54 according to IEC EN 60529 CO...

Page 17: ...losive atmosphere Danger Explosion hazard from wrong separation distances If you do not observe the minimum separation distance between 2 intrinsically safe circuits this can lead to added currents or voltages This can result in a current voltage flashover generating sparks The sparks can ignite the surrounding potentially explosive atmosphere Ensure you observe all separation distances between 2 ...

Page 18: ...zener barriers without galvanic isolation must be grounded Observe the grounding requirements according to IEC EN 60079 14 and NEC 504 50 The maintenance of these requirements prevents the occurrence of a dangerous potential with respect to ground If the zener barrier is not grounded and a fault occurs a dangerous spark can cause Figure 3 3 Non grounded zener barrier Note For more information on g...

Page 19: ... flows The Z system grounding is made by an integrated ground connection in the base of each zener barrier By connecting each zener barrier to the 35 mm DIN mounting rail the total system can be grounded via a single point The following figures show several grounding schemes Equipotential bonding via DIN mounting rail Group grounding through insulated mounting Individual grounding through insulate...

Page 20: ...via the DIN mounting rail Figure 3 6 Insulated mounting group grounding 1 Terminal block USLKG5 2 Zener barrier 3 35 mm DIN mounting rail according to EN 60715 1 Terminal block USLKG5 2 Zener barrier 3 35 mm DIN mounting rail according to EN 60715 4 Adapter ZH Z AB NS 1 2 3 1 2 3 4 ...

Page 21: ...ulated mounting individual grounding 1 Single socket ZH Z ES 2 Zener barrier 3 35 mm DIN mounting rail according to EN 60715 4 Adapter ZH Z AB SS 5 Grounding bar ZH Z NLS Cu3 10 6 Grounding bar feed ZH Z LL 7 Spacer ZH Z AR 125 8 Terminal ZH Z AK16 1 2 3 4 5 6 7 8 ...

Page 22: ...oltage above the ground potential Although it does not actually float the signal to noise ratio is improved A further advantage of multi channel zener barriers is that a higher packing density can be achieved Figure 3 8 Grounding with 1 channel zener barrier Figure 3 9 Grounding with 2 channel zener barrier Zone 2 Div 2 Zone 0 1 2 Div 1 2 2 1 7 8 24 V RM Power supply can not be grounded 4 mA 20 mA...

Page 23: ...nding potentially explosive atmosphere Ground the device Observe the grounding requirements for type of protection Ex i according to IEC EN 60079 14 Ensure that external ground connections exist are in good condition and are not damaged or corroded Danger Explosion hazard from live wiring If you connect or disconnect energized non intrinsically safe circuits in a potentially explosive atmosphere s...

Page 24: ...moving the Device Remove the device See figure below Figure 5 1 Danger Danger to life from using damaged or repaired devices Using a defective or repaired device can compromise its function and its electrical safety Do not use a damaged or polluted device The device must not be repaired changed or manipulated If there is a defect always replace the device with an original device from Pepperl Fuchs...

Page 25: ...that can be supplied between the terminals in the non hazardous area and ground without the fuse responding This value is determined for an intrinsically safe circuit and an ambient temperature of 20 C 68 F Fuse rating mA The function of the fuse is to create an open circuit in the event of a power supply fault It also protects the zener diodes from damage in the event of an abnormal operating con...

Page 26: ...drawings refer to chapter Dimensions Degree of Protection IP20 according to EN 60529 Connection Screw terminals for leads of up to a max of 2 x 2 5 mm2 2 x 14 AWG Observe the tightening torque of the terminal screws The tightening torque is 0 5 Nm to 0 6 Nm Ambient Conditions Ambient Temperature 20 C to 60 C 4 F to 140 F Storage Temperature 25 C to 70 C 13 F to 158 F Relative Humidity max 75 witho...

Page 27: ... Label ZH ES LB with labeling field 29 mm x 8 mm Equipotential bonding via DIN mounting rail Terminal block USLKG5 35 mm DIN mounting rail according to EN 60715 Group grounding through insulated mounting Terminal block USLKG5 35 mm DIN mounting rail according to EN 60715 Adapter ZH Z AB NS Individual grounding through insulated mounting Single socket ZH Z ES 35 mm DIN mounting rail according to EN...

Page 28: ...ion if available Position 1 Z Z System Position 2 0 DC device with positive polarity 7 DC device with positive polarity 8 DC device with negative polarity 9 AC device Position 4 1K With increased nominal resistance 1 k CL With current limiting F With replaceable back up fuse H High power version R With internal measuring resistor ...

Page 29: ...Z System Zener Barriers Technical Specifications 2016 03 29 6 4 Dimensions 6 4 1 Housing Types Zener Barriers Z System Figure 6 1 5 6 7 8 1 2 3 4 12 5 110 6 115 ...

Page 30: ...04 Липецк 4742 52 20 81 Магнитогорск 3519 55 03 13 Москва 495 268 04 70 Мурманск 8152 59 64 93 Набережные Челны 8552 20 53 41 Нижний Новгород 831 429 08 12 Новокузнецк 3843 20 46 81 Новосибирск 383 227 86 73 Орел 4862 44 53 42 Оренбург 3532 37 68 04 Пенза 8412 22 31 16 Пермь 342 205 81 47 Ростов на Дону 863 308 18 15 Рязань 4912 46 61 64 Самара 846 206 03 16 Санкт Петербург 812 309 46 40 Саратов 8...

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