GESTRA NRS 1-51 Installation Instructions Manual Download Page 1 | Manualshive

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NRS 1-51

Installation Instructions 818955-04

Level Switch NRS 1-51

GESTRA Steam Systems

EN

English

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Summary of Contents for NRS 1-51

Page 1: ...1 NRS 1 51 Installation Instructions 818955 04 Level Switch NRS 1 51 GESTRA Steam Systems EN English ...

Page 2: ...phère Explosible 6 UL cUL CSA Approval 6 Note on the Declaration of Conformity Declaration by the Manufacturer 6 Safety characteristics of the subsystem NRG 1 51 NRS 1 51 7 Terms and abbreviations 7 Determination of the Safety Integrity Level SIL for safety related systems 8 Functional Safety acc to IEC 61508 NRS 1 51 12 Dimensions and Functional Elements Safety note 13 Scope of supply 13 Importan...

Page 3: ... 21 Checking the switchpoints 21 Decommissioning replacing level switch 21 Disposal 21 Further Notes Electrical Connection Connection of supply voltage 14 Connection of level electrode 14 Connection of control circuit 14 Connection of logic unit standby input 15 Connection for signal output 15 Tools 15 Wiring diagram for level switch NRS 1 51 16 Schematic representations of arrangements 17 Explana...

Page 4: ...or steam 40 mm and water 100 mm the installation is considered to be internal In this case the rinsing processes do not have to be monitored An autmatic self testing routine monitors the safety functions of the level switch In the event of a malfunction the control circuit opens instantaneously and switches off e g the feedwater supply Alarm and malfunction messages are indicated by LEDs and the s...

Page 5: ...ÜV Bulletin Water Level 100 The VdTÜV Bulletin Wasserstand Water Level 100 specifies the requirements made on water level control and limiting equipment for boilers Functional Safety acc to IEC 61508 The level switch NRS 1 51 is certified acc to IEC 61508 only if used in combination with level elec trode NRG 1 51 This standard describes the functional safety of safety related electrical electronic...

Page 6: ...king Note that the requirements of the IEC 61508 are not met if the NRG 1 51 NRG 1 12 Zener barriers NRS 1 51 are interconnected Note on the Declaration of Conformity Declaration by the Manufacturer For details on the conformity of our equipment according to the European Directives see our Declaration of Conformity or our Declaration of Manufacturer The current Declaration of Conformity Declaratio...

Page 7: ...NRG 1 51 NRS 1 51 will go to the safe state which means that the contacts of both output relays will open the control circuit Safety characteristics SIL Architecture Lifetime a Proof Test Interval a General 3 1oo2 20 20 SFF PFDav PFHav λ DU Level switch NRS 1 51 alone 98 54 1 18 x 10 4 3 73 x 10 8 7 33 x 10 8 h Level switch NRS 1 51 in conjunction with one level electrode NRG 1 51 98 17 1 69 x 10 ...

Page 8: ...d system Table Fig 3 shows the dependence of the Safety Integrity Level SIL on the average probability of failure on demand of a safety function for the whole safety related system PFDsys The Low demand mode is here considered for a water level limiter which means that the frequency of demands for operation of the safety related system is no greater than one per year Low demand mode PFDsys Safety ...

Page 9: ...manufacturer s specification to ensure interference suppression Signal output 1 volt free output for instantaneous external signalling 24 V DC max 100 mA semiconductor output Indicators and adjustors 2 buttons for test and diagnosis 2 red green LEDs for indicating the operating mode and alarm 3 red LEDs for diagnosis Housing Housing material base polycarbonate black front polycarbonate grey Cross ...

Page 10: ...ensation Site altitude max 2000 m Approvals EC Prototype approval PED Pressure Equipment Directive 2014 68 EU EN 12952 11 EN 12953 09 Requirements made on limiting equipment for boilers Functional safety IEC 61508 Functional safety of safety related electrical SIL 3 electronic programmable electronic systems TÜV type approval VdTÜV Bulletin Wasserstand 100 Water Level 100 Requirements made on wate...

Page 11: ... Ambient temperature sensitivity Wire link provided on site Control circuit Fuse provided on site Type designation Supply voltage Protection Manufacturer Wiring diagram Safety note Disposal note Type approval no Ambient temperature sensitivity Wire link provided on site Control circuit Fuse provided on site Serial number Serial number TÜV SHWS XX 423 TÜV SHWS XX 423 ...

Page 12: ...sions and Functional Elements NRS 1 51 1 Upper terminal strip 2 Lower terminal strip 3 Fixing screws cross recess head screws M3 6 Enclosure 7 Supporting rail type TH 35 EN 60715 Key Fig 6 1 2 3 6 7 100 118 73 ...

Page 13: ...tence Danger The terminal strips of the NRS 1 51 are live during operation This presents the danger of electric shock Always cut off power supply to the equipment before mounting removing or connecting the terminal strips Attention The name plate specifies the technical features of the equipment Note that any piece of equipment without its specific name plate must neither be commissioned nor opera...

Page 14: ...atically If a lockout function is required by the installation it must be provided in the follow up circuitry control circuit The circuitry must meet the requirements of the EN 50156 Connection of supply voltage Provide the level switch NRS 1 51 with an external semi delay fuse 0 5 A If the equipment is supplied with 24 V DC use a safety power supply unit with safe electrical isolation The power s...

Page 15: ...th safety extra low voltage SELV Attention n Fuse the level switch NRS 1 51 with an external semi delay fuse 0 5 A n Connect screens to terminal 5 and to the central earthing point CEP in the control cabinet n To protect the switching contacts fuse the safety circuit with a slow blow fuse 2 A or 1 A for 72 hrs operation acc to TRD 604 n When switching off inductive loads voltage spikes are produce...

Page 16: ...igh water level alarm acc to TRD EN 12952 EN 12953 b Stand by input 1 24 V DC for connecting the logic unit SRL 6 50 c Level electrode NRG 1 51 NRG 1 12 CEP Central earthing point in control cabinet Key 27 16 1 2 3 4 5 6 7 8 17 18 19 20 21 22 23 24 9 25 10 26 11 12 28 13 29 14 30 15 Test Fig 7 L N 8 9 0 a 0 b c CEP NRS 1 51 with response sensitivity 0 5 μS cm Connect the two internal screens to te...

Page 17: ... of 1 level electrode NRG 1 51 and 1 level switch NRS 1 51 as high water level alarm The level switch opens two separate control circuits Functional safety IEC 61508 SIL 3 d Level electrode s NRG 1 51 e Level switch NRS 1 51 f Control circuit Basic Settings Factory setting Level Switch NRS 1 51 The level switch features the following factory set default values n De energizing delay 3 sec Commissio...

Page 18: ...nd indication Fault Remedy Sightglass indicates high water level HW exceeded red LED for level electrode 1 is not illuminated Safety circuit closed The electrode rod is too short Replace electrode rod and cut new rod to the length dictated by the switchpoint HW The earth connection to the vessel is interrupted Clean seating surfaces and screw in level electrode with metallic joint ring Do not insu...

Page 19: ...evel electrode 1 is flashing Alarm simulated in channel 1 or 2 De energizing delay is running Signal output 1 is closed instantaneously Red LED for level electrode 1 is illuminated Delay time has elapsed output contacts open Signal output 1 is closed Test finished Replace level switch if the test was not finished successfully Operation Alarm and Test Indicators and adjustors Attention Before carry...

Page 20: ... eliminated the level switch returns to normal operation After elimination of the fault switch off the supply voltage and switch it on again after approx 5 sec Further fault indications Status Diagnosis Function Next activity Faulty evaluation of level electrode 1 channel 1 Diagnosis LED 1 and LED alarm 1 illuminated Output contacts are opened instantaneously Signal output 1 closes instantaneously...

Page 21: ...ning replacing level switch Disposal Remove the level switch and separate the waste materials in accordance with the material specification Electronic component parts such as the circuit board must be disposed of separately For the disposal of the levels switch observe the pertinent legal regulations concerning waste disposal In the event of an alarm the level switch NRS 1 51 does not interlock au...

Page 22: ...22 For your Notes ...

Page 23: ...23 For your Notes ...

Page 24: ...08806 04 GESTRA AG Bremen Printed in Germany Agencies all over the world www gestra de GESTRA AG Münchener Straße 77 28215 Bremen Germany Telefon 49 421 3503 0 Telefax 49 421 3503 393 E mail info de gestra com Web www gestra de ...

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