Flowserve NRS 1-50 For TWO Electrodes User Manual

1Installation Instructions 818953-01Level Switch NRS 1-50GESTRA Steam SystemsGESTRA ENEnglishNRS 1-50 For TWO Electrodes

10Name plate / markingFig. 5Type designationMains voltage/ ProtectionSerial numberManufacturerWiring diagramSafety noteDisposal noteTechnical Data

11Fig. 6Dimensions and Functional ElementsNRS 1-501234 5671 Upper terminal strip2 Lower terminal strip3 Fixing screws (cross recess head screws M3)

12Safety noteWater level limiters are safety devices and must only be installed, wired and commissioned by qualified and competent staff.Retrofitting a

13Electrical ConnectionConnection of level electrodeTo connect the level electrode(s) use screened multi-core control cable with a min. conductor size

14Electrical Connection – continued –Toolsn Screwdriver for slotted screws, size 3.5 x 100 mm, completely insulated according to VDE 0680-1.Dangern

1527161 2 3 4 5 6 7 817 18 19 20 21 22 23 24925102611 12281329143015NRG 1...-50NRG 16-36M 0,5ANRG 1...-501211242333Electrical Connection – continued

16ddeef fd defefddgeffFig. 8 Fig. 9Fig. 10 Fig. 11Fig. 12 Fig. 13Electrical Connection – continued – Schematic representations of arrangementseed L

17Electrical Connection – continued – Explanatory notes to schematic respresentationsSteam boiler plants according to TRD 604, EN 12952-07 / EN 1295

18Commissioning ProcedureChanging configurationDangerThe terminal strips of the NRS 1-50 are live during operation.This presents the danger of electric

19Commissioning – continued –Checking switchpoint and functionStartActivity Indication FunctionApply mains voltage. All LEDs are illuminated.System

2ContentsUsage for the intended purpose ...

20OperationActivity Indication FunctionLevel electrode(s) submerged.Green LEDs for level electrode 1 / 2 illuminated.Output contacts are closed. Sig

21Fault Indication and Troubleshooting – continued –Diagnosis Display 1 and activity Display 2 Fault Remedy LED alarm 1 and diagnosis LED 1 illumina

22Measure the electrode voltage in order to check whether the level electrode is immersed or if there is a malfunction. Please observe Fig. 15. ≈ 0.7

23Emergency operationEmergency operation for water level limiterIf the level switch NRS 1-50 works with two level electrodes NRG 1...-50 (water level

24Action against high frequency interferenceShould sporadic failures occur in installations susceptible to faults (e. g. malfunctions due to out-of-ph

25For your notes

26For your notes

27For your notes

28818953-01/12-2009cm (808805-03) · GESTRA AG · Bremen · Printed in GermanyGESTRA Agencies all over the world:www.gestra.deGESTRA AGP. O. Box 10 54 60

3Contents – continued –Changing configuration ...

4ApplicationUsage for the intended purposeThe level switch NRS 1-50 is used in conjunction with level electrodes NRG 1...-.. to limit the water level

5Directives and StandardsPressure Equipment Directive (PED) 97/23/ECWater level limiters are safety accessories as defined in the Pressure Equipment Di

6Functional Safety acc. to IEC 61508Safety characteristics of the subsystem NRG 1...-50 / NRS 1-50The level switch NRS 1-50 is certified acc. to IEC 61

7Functional Safety acc. to IEC 61508 – continued –Determination of the Safety Integrity Level (SIL) for safety-related systemsLevel electrode, level

8NRS 1-50Supply:Mains voltage 24 VDC +/– 20 %, 0.3 A or 100-240 VAC + 10/– 15 %, 47-63 Hz, 0.2 AExternal fuse 0.5 A (semi-delay)Power consumption 7 VA

9NRS 1-50 – continued –Further conditions: Ambient temperature when system is switched on: 0 ° ... 55 °C during operation: –10 ... 55 °CTransport te