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NRS 1-56 - Installation & Operating Manual -

850142-00

Usage for the intended purpose

The NRS 1-56 level switch can be used in conjunction with various conductive level electrodes as an
interval level control system in pressurised steam and hot-water plants and in condensate and feedwater
tanks.
The NRS 1-56 level switch also indicates two alarm states, which can be configured as MIN and MAX.

Overview of possible unit combinations

Level switch

Level electrode

Version

NRS 1-56

NRG 1-52

4-rod electrode

NRS 1-56

4 x NRG 16-4

1-rod electrode

NRS 1-56

NRG 16-36

4-rod electrode

Fig. 1

Key to Fig. 1:

NRG = level electrode
NRS = level switch

To ensure the proper use of equipment for all types of use, please also read the Installation &

Operating Manuals for the system components used.

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You can find the latest Installation & Operating Manuals for the system components named
in

Fig. 1

on our website:

http://www.gestra.com/documents/brochures.html

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Содержание NRS 1-56

Страница 1: ...Original Installation Operating Manual E N English Level Switch NRS 1 56 850142 00 ...

Страница 2: ...ion NRS 1 56 14 Factory settings 14 Functional elements and dimensions 15 Installing the NRS 1 56 level switch 16 Electrical connection safety notes 16 Wiring diagram for the NRS 1 56 level switch 17 Electrical connection 18 Connecting the 24 V DC power supply 18 Connecting the output contacts 18 Connecting the level electrodes 18 Connection examples 19 Inlet control various level electrodes conne...

Страница 3: ...m malfunctions 27 Causes 27 Indication of system malfunctions 28 Action against high frequency interference 28 What to do in the event of system malfunctions 29 Taking out of service 29 Disposal 29 Returning decontaminated equipment 29 EU Declaration of Conformity 30 ...

Страница 4: ... latest Installation Operating Manuals on our website http www gestra com documents brochures html Copyright All rights reserved Any misuse particularly reproduction and dissemination to third parties is not permit ted The General Terms Conditions of GESTRA AG apply Scope of delivery Product package 1 x level switch NRS 1 56 1 x Installation Operating Manual ...

Страница 5: ...ons Please also read the instructions for use of any accessories The Installation Operating Manual is part of the product package Keep it in an easily accessible location Availability of this Installation Operating Manual Make sure this Installation Operating Manual is always available to the operator If you pass on or sell the equipment to a third party please also hand over the Installation Oper...

Страница 6: ...tuation that results in death or serious injury WARNING Warning of a dangerous situation that may possibly result in death or serious injury CAUTION Warning of a situation that may result in minor or moderate injury ATTENTION Warning of a situation that results in damage to property or the environment ...

Страница 7: ...rating Manual 850142 00 Specialist terms Abbreviations Here we explain some abbreviations specialist terms etc which are used in this Manual NRG NRS GESTRA equipment and type designations see page 8 SELV Safety Extra Low Voltage ...

Страница 8: ... configured as MIN and MAX Overview of possible unit combinations Level switch Level electrode Version NRS 1 56 NRG 1 52 4 rod electrode NRS 1 56 4 x NRG 16 4 1 rod electrode NRS 1 56 NRG 16 36 4 rod electrode Fig 1 Key to Fig 1 NRG level electrode NRS level switch To ensure the proper use of equipment for all types of use please also read the Installation Operating Manuals for the system componen...

Страница 9: ...ctive Directive 2014 30 EU EMC Directive Directive 2011 65 EU RoHS Directive Standards DIN EN 60730 1 Automatic electrical controls Part 1 General requirements EN 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements Standards documents VdTÜV Bulletin BP WASS 0100 RL Requirements for water level control and limiting equipment Improper use There is a danger of dea...

Страница 10: ... may be faulty Perform failure analysis Only replace faulty equipment with identical equipment from GESTRA AG Required personnel qualifications Activity Personnel Integration in control system Specialist staff Plant designer Installation electrical connection bringing into service Specialist staff Electrician installer Operation Boiler service technician Staff trained by the plant operator Mainten...

Страница 11: ...d or out of the water and depending on which function is set it switches the controller output contact which then turns the feedwater pump on or off for example The Pump LED lights up when the level switch has switched the feedwater pump on for example Behaviour in the event of MIN MAX water level alarms When the MIN or MAX water level is reached the level switch recognises that the corresponding ...

Страница 12: ...m or 10 μS cm 10 000 μS cm Alarm 1 Alarm 2 outputs 2 x volt free relay contacts contact material AgNi0 15 AgSnO2 Maximum switching current 8 A at 250 V AC 30 V DC cos ϕ 1 Inductive loads must have interference suppression RC combination as specified by the manufacturer Off delay of Alarm 1 2 outputs 3 seconds factory set Pump output 1 x volt free relay contact contact material AgNi0 15 AgSnO2 Maxi...

Страница 13: ...Housing IP 40 Terminal strips IP 20 Electrical safety Degree of contamination 2 for installation in control cabinet with protection rating IP 54 fully insulated Admissible ambient conditions Service temperature 0 C 55 C 0 C 55 C at power on Storage temperature 20 C 70 C Transport temperature 20 C 80 C 100 hours Air humidity max 95 non condensing Only switch on after a 24 hour defrosting period Hou...

Страница 14: ...ing switch white 1 OFF 2 ON 3 OFF 4 OFF Configuring the function and sensitivity see page 22 Fig 13 19 20 Tamb 55 C 131 F T IP 40 IP 20 16 17 Alarm2 3 s Alarm1 3 s 18 21 22 23 250 V T 2 5 A See installation instructions Betriebsanleitung beachten Voir instructions de montage NRS 1 56 Pump Valve GESTRA AG Münchener Str 77 28215 Bremen GERMANY Niveauschalter Level switch Commutateur de niveau Safety...

Страница 15: ...terminal strip D 4 pole code switch for setting the function and sensitivity E Housing F Support rail TH 35 Functional elements and dimensions 1 ON 2 3 4 5 6 7 2 3 4 19 20 21 22 17 18 46 74 120 A B C F E The code switch can be accessed by removing the lower terminal strip Equipment settings see page 22 Fig 4 1 ON 2 3 4 D ...

Страница 16: ...e voltage before commencing work 1 Switch off the voltage to the plant and secure the surrounding equipment in the control cabinet if live so it cannot be touched 2 Carefully press the unit onto the support rail until the holder clips into place Electrical connection safety notes DANGER Incorrectly connecting the level switch or any associated components is a danger to plant safety Connect the lev...

Страница 17: ...0 5A Pump 1 electrode rod pump OFF for inlet control Alarm 1 MIN MAX electrode rod Alarm 2 MIN MAX electrode rod Fig 5 17 18 19 20 21 22 2 3 4 5 6 7 ZEP 24 V DC M 0 5 A Relay output Alarm 2 Pump output contact Alarm 1 MIN MAX MIN MAX ON OFF 3 s 3 s Pump 2 electrode rod pump ON for inlet control Functional earth Tank or reference electrode ...

Страница 18: ...ent with 24 V DC Use an M0 5A fuse as an external fuse Connecting the output contacts Connect the outputs as shown in the wiring diagrams in Fig 5 Only use the terminals specified in the wiring diagrams Use a T2 5A fuse to protect the switching contacts Connecting the level electrodes Use a shielded multi core control cable with a minimum conductor size of 0 5 mm2 e g LIYCY 5 x 0 5 mm2 Maximum cab...

Страница 19: ... μS cm 1 2 3 4 5 6 7 8 NRG 1 52 4 3 2 1 Fig 6 MIN1 MIN2 alarm and pump ON OFF sensitivity 10 μS cm 1 2 3 4 5 6 7 8 NRG 1 52 4 3 2 1 Fig 7 MIN MAX alarm and pump ON OFF sensitivity 10 μS cm with 4 x NRG 16 4 1 2 3 4 5 6 7 8 NRG16 4 NRG16 4 NRG16 4 3 3 3 NRG16 4 3 Fig 8 MAX Alarm 1 Pump OFF Pump ON MIN Alarm 2 Pump OFF Pump ON MIN 1 Alarm 1 MIN 2 Alarm 2 MAX Alarm 1 Pump OFF Pump ON MIN Alarm 2 ...

Страница 20: ...ON OFF sensitivity 10 μS cm 1 2 3 4 5 6 7 8 NRG 1 52 4 3 2 1 Fig 9 MAX1 MAX2 alarm and pump ON OFF sensitivity 10 μS cm 1 2 3 4 5 6 7 8 NRG 1 52 4 3 2 1 Fig 10 MAX alarm and pump ON OFF sensitivity 10 μS cm with NRG 16 36 1 2 3 4 5 6 7 8 NRG 16 36 8 7 5 6 Fig 11 MAX Alarm 1 Pump ON Pump OFF MIN Alarm 2 MAX 2 Alarm 1 MAX 1 Alarm 2 Pump ON Pump OFF MAX1 Alarm 1 Pump OFF Pump ON ...

Страница 21: ...witch D see Fig 4 To make changes you can access the code switch as follows Make changes before installing the level switch when access is easier You will need the following tools Slotted screwdriver size 2 5 fully insulated Proceed as follows 1 Switch off the supply voltage to the equipment or plant 2 Carefully unscrew the lower terminal strip with a screwdriver then remove see Fig 12 3 Set code ...

Страница 22: ...on and sensitivity Level switch NRS 1 56 Code switch D Function S1 S2 S3 S4 Inlet control factory setting OFF Discharge control ON Alarm 2 MIN Alarm 1 MIN ON ON Alarm 2 MAX Alarm 1 MIN OFF ON Alarm 2 MIN Alarm 1 MAX factory setting ON OFF Alarm 2 MAX Alarm 1 MAX OFF OFF Sensitivity 10 μS cm factory setting OFF Sensitivity 0 5 μS cm ON Fig 13 ...

Страница 23: ...ing within the desired parameters The ON LED lights up green Status display during normal operation Depending on the water level the Alarm 1 2 LEDs and Pump LED light up Checking the switchpoint and function inlet control Reduce the water level until it is below the Pump ON level The Pump ON electrode rod is no longer immersed The Pump LED lights up green The pump relay is energised Contacts 19 20...

Страница 24: ...ntil the water is above the MAX level The MAX electrode rod is immersed LED 1 or 2 flashes red depending on the configuration The off delay is in progress LED 1 or 2 lights up red depending on the configuration The delay time has elapsed The MAX relay is de energised MAX output contacts 21 23 are closed 22 23 are open Factory setting of output contacts Alarm 1 MAX Checking the switchpoint and func...

Страница 25: ... MAX level switchpoint LED 1 or 2 flashes red depending on the configuration The off delay is in progress LED 1 or 2 lights up red depending on the configuration The delay time has elapsed The MAX relay is de energised MAX output contacts 21 23 are closed 22 23 are open Factory setting of output contacts Alarm 1 MAX Behaviour on the occurrence of a MIN alarm The water has dropped below the MIN lev...

Страница 26: ...ergised 3 s 3 OFF energised OFF energised 1 s 4 OFF energised flashes energised 3 s 5 OFF energised lights up de energised 3 s 6 OFF energised OFF energised 3 s To end the test release the Test button To continuously repeat the test press and hold the Test button If a genuine alarm occurs this will not be tested during the test sequence Faulty equipment jeopardises plant safety If the NRS 1 56 lev...

Страница 27: ... vibration interference sources etc Wiring Does the wiring conform to the wiring diagrams Level switch configuration Are the function and sensitivity correctly set on code switch D Length of electrodes Do the electrodes have the correct length and are they correctly assigned on the level switch DANGER There is a risk of electric shock during work on electrical systems Always switch off the voltage...

Страница 28: ...es red Internal error de ener gised de ener gised de ener gised red off flashes red flashes red Fig 16 Action against high frequency interference High frequency interference can be caused by out of phase switching operations If such interference oc curs and results in sporadic failure we recommend taking the following action to suppress interference Provide inductive loads with RC combinations as ...

Страница 29: ...decontaminated equipment If products have come into contact with media that are hazardous to health they must be drained and decontaminated before being returned to GESTRA AG Such media include solid liquid or gaseous substances mixtures of these or radiation GESTRA AG can accept returned products only if accompanied by a completed and signed return note and also a completed and signed declaration...

Страница 30: ...ing European Directives Directive 2014 35 EU Low Voltage Directive Directive 2014 30 EU EMC Directive Directive 2011 65 EU RoHS Directive Please see our Declaration of Conformity for details on the conformity of our equipment with European Directives The current Declaration of Conformity can be found online at www gestra com or can be requested from us ...

Страница 31: ...31 NRS 1 56 Installation Operating Manual 850142 00 For your notes ...

Страница 32: ...5 Bremen Germany Phone 49 421 3503 0 Fax 49 421 3503 393 e mail info de gestra com Web www gestra com 850142 00 10 2019cm 808002 00 GESTRA AG Bremen Printed in Germany You can find our authorised agents around the world at www gestra com ...

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