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GESTRA NRS 2-50, Оригинальное руководство по установке и эксплуатации

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NRS 2-50, NRS 2-51 - Installation & Operating Manual - 

819179-05

Important notes

Usage for the intended purpose

The NRS 2-50, NRS 2-51 level switch is used in combination with NRG 2.-.. level electrodes and  

NRGT 26-. level transmitters as a limit switch and water level controller, e.g. in steam boilers and hot 

water installations or in condensate and feedwater tanks. The level switch indicates when a MIN and 

MAX water level has been reached, and switches the feedwater pump on and off (NRS 2-51).
The NRS 2-50, NRS 2-51 level switch can be combined with the NRG 21-.. and NRG 26-21 level  

electrodes and the NRGT 26-. level transmitter.

The 

NRS 2-50, NRS 2-51 level switch

 processes the voltage signals from the NRG 2..-.. level electrodes 

or the current signal from the NRGT 26-. level transmitter. These voltage and current signals vary depend-

ing on the level. 
In the 

NRS 2-50, NRS 2-51 level switch

, the input signal is normalised to 0 and 100% of the boiler 

measuring range, and the switchpoints for the MIN/MAX water level are adjusted as required within this 

range. Then, during normal operation the actual value is shown on the 7-segment LED display.
If the MIN or MAX water level is reached, the MIN or MAX output contact switches over after the off delay 

and the MIN or MAX LED lights up. 
The 

NRS 2-51 level switch

 also functions as an interval level control system 

(fill/discharge, switch- 

selectable)

. With this equipment, if the lower or upper water level switchpoint is reached, the controller 

output contact switches – depending on which function is set – which then turns the feedwater pump on 

or off. The amber LED lights up when the level switch has switched the feedwater pump on, for example. 
Faults or malfunctions in the level electrode or level transmitter, the electrical connection or the settings 

are indicated on the 7-segment LED display. In the event of a malfunction, the MIN and MAX alarm is 

triggered. 
If faults occur only in the 

NRS 2-50, NRS 2-51 level switch

, the MIN and MAX alarm is triggered and the 

system is restarted. 
Parameters can be changed or the MIN/MAX alarm simulated by operating the rotary knob. 
The equipment has an actual value output 4 - 20 mA for external level indication.

Function

Safety note

The equipment may only be installed, wired and brought into service by qualified and competent staff.
Maintenance and setup work may only be performed by authorised staff who have undergone specific 

training.

Danger

The terminal strips of the equipment are live during operation.

There is a risk of serious injury due to electric shock!

Always 

cut off power

 to the equipment before working on the terminal strips (installa-

tion, removal, connecting cables).

Attention

The name plate indicates the technical features of the equipment. Do not bring into 

service or operate any equipment that does not bear its own specific name plate.

Содержание NRS 2-50

Страница 1: ...E N English Original Installation Operating Manual 819179 05 Level Switch NRS 2 50 NRS 2 51 ...

Страница 2: ...cturer s Declaration 5 Approval for marine use 5 Technical data NRS 2 50 NRS 2 51 6 Product package 7 Name plate identification 8 Installation Installation in the door of the control cabinet 9 Dimensions of the NRS 2 50 NRS 2 51 10 Key 10 Installation in a control cabinet 10 In the control cabinet Wiring the level switch Wiring diagram for level switch NRS 2 50 11 Key 11 Wiring diagram for level s...

Страница 3: ...15 Operating the level switch Meaning of codes on the 7 segment display 17 Setting the measuring range 18 Bringing into service Setting parameters 19 Setting the measuring range 20 Operation alarm and testing Setting switchpoints and indicators 21 Indications 22 Checking the function of the MIN MAX output contacts 22 Passwort protection 23 Troubleshooting Indications diagnosis and remedies 24 Furt...

Страница 4: ... an interval level control system fill discharge switch selectable With this equipment if the lower or upper water level switchpoint is reached the controller output contact switches depending on which function is set which then turns the feedwater pump on or off The amber LED lights up when the level switch has switched the feedwater pump on for example Faults or malfunctions in the level electro...

Страница 5: ...rective and EMC Electromagnetic Compatibility The equipment conforms to the requirements of the Low Voltage Directive 2014 35 EU and the EMC Directive 2014 30 EU Notes on the Declaration of Conformity Manufacturer s Declaration For details on the conformity of our equipment with European Directives please refer to our Declaration of Conformity or our Manufacturer s Declaration The current Declarat...

Страница 6: ... 51 1 analogue output 4 20 mA max output load 500 ohms e g for actual value indication Displays and controls 1 rotary knob with integrated pushbutton for testing the MIN MAX alarm and setting the parameters 1 four digit seven segment LED display green 2 red LEDs for MIN MAX alarm 1 amber LED e g for feedwater pump on NRS 2 51 1 four pole code switch for configuration Housing Housing material base ...

Страница 7: ...24 hours Relative humidity Max 95 non condensing Approvals TÜV Certificate VdTÜV Bulletin Wasserstand 100 Water Level 100 Requirements for water level control and limiting equipment Type approval no TÜV WR XX 425 see name plate UL cUL CSA certification UL 508 and CSA C22 2 No 14 13 Standards for Industrial Control Equipment File E243189 Technical data Product package NRS 2 50 1 level switch NRS 2 ...

Страница 8: ... P40 GESTRA AG Münchener Str 77 28215 Bremen Made in Germany Name plate identification Name plate bottom Type designation Fig 2 IP rating Safety note Output contacts Ambient temperature External fuse for output contacts Type approval number Disposal info Supply voltage Power consumption Fuse provided on site Technical data Serial number Actual value output Name plate of NRS 2 50 top Name plate of ...

Страница 9: ...lled in the door of a control cabinet The advantage of using the adapter is that the status is visible and alarms can be tested without open ing the control cabinet door When installed the adapter has a rating of IP65 Please refer to the panel adapter Installation Operating Manual 850625 xx for further information Installation in the door of the control cabinet ...

Страница 10: ...RS 2 50 NRS 2 51 1 Upper terminal strip 2 Lower terminal strip Key Installation in a control cabinet The NRS 2 50 NRS 2 51 level switch is clipped onto a type TH 35 EN 60715 support rail in the control cabinet Fig 1 4 3 Housing 4 Support rail TH 35 EN 60715 Fig 1 4 3 1 2 46 74 120 15 continued ...

Страница 11: ... 21 Max three NRS NRR 2 5 units can be connected connection in parallel 7 Level transmitter NRGT 26 4 20 mA with shield connection in terminal box Max three NRS NRR 2 5 units can be connected series connection 8 Central earthing point CEP in control cabinet 9 MIN output contact off delay 3 seconds 0 MAX output contact off delay 3 seconds a Actual value output 4 20 mA Key NRS 2 50 0 5A semi delay 5...

Страница 12: ...NRR 2 5 units can be connected connection in parallel 7 Level transmitter NRGT 26 4 20 mA with shield connection in terminal box Max three NRS NRR 2 5 units can be connected series connection 8 Central earthing point CEP in control cabinet 9 MIN output contact off delay 3 seconds 0 MAX output contact off delay 3 seconds a Pump output contact b Actual value output 4 20 mA Key 5 7 9 8 a 0 6 NRS 2 51...

Страница 13: ...6 23 in line with the desired switching functions Provide an external 2 5A slow blow fuse for the output contacts Switching off inductive loads produces surges that can have a major adverse effect on the operation of open and closed loop control systems Connected inductive loads must therefore have interference suppression RC combination as per the manufacturer s specifications Tools n Screwdriver...

Страница 14: ...1 and NRGT 26 n Route the connecting cable between items of equipment separately from power lines n The level transmitter must be connected to its own dedicated power supply Factory settings Level switch NRS 2 50 n Off delay 3 sec factory set n Input wired as a voltage input for connecting an NRG 21 or NRG 26 21 level electrode n MAX switchpoint AL Hi 80 n MIN switchpoint AL Lo 20 n Calibration va...

Страница 15: ...de transmitter The input and function are determined by the setting of code switch c To make changes you can access the code switch as follows s Switch off the supply voltage n Remove the lower terminal strip Fig 4 n Insert a screwdriver on the right and left between the terminal strip and the front frame as shown by the arrows n Release the terminal strip on the right and left sides by turning th...

Страница 16: ...NRG 26 21 OFF Input for connecting level transmitter NRGT 26 ON Level switch NRS 2 51 S2 S3 Input for connecting level electrode NRG 21 or NRG 26 21 OFF Input for connecting level transmitter NRGT 26 ON Fill control OFF Discharge control ON grey factory setting Toggle switch white Attention When connecting the NRGT 26 level transmitter please set the upper and lower ends of the measuring range onl...

Страница 17: ...d protection is disabled Factory setting 1902 cannot be changed CAL L Calibrate L Only if level electrode NRG 21 or NRG 26 21 is connected Set lower end of measuring range CAL P Calibrate Adjustable between 25 and 100 CAL H Calibrate H Set upper end of measuring range Appears in parameterization mode quit Quit Input is not confirmed done Done Input is confirmed Appears in the event of malfunctions...

Страница 18: ...e measuring range only in the transmitter A Lower end of measuring range adjustable B Upper end of measuring range adjustable C Measuring range mm xxx D Inactive range E Maximum installed length at 238 C Set the lower and upper ends of the measuring range for your fill level measurement This produces the measuring range C Please convert the measuring range into percent A B C NRG 2 NRGT 26 D D 37 2...

Страница 19: ...knob Turning clockwise increases the value turning anti clockwise reduces the value When your entries are complete Press and hold the button within 3 sec done is displayed After this the display toggles between the parameter and the new value Input is confirmed The display shows the parameter once more If you do not confirm your entry within 3 sec or you do not make any further entries quit is bri...

Страница 20: ...easuring range Note n Adjusting the measuring range The advantage of option 2 is that the tank only has to be partially filled Level electrode NRG 2 only Setting the measuring range option 2 Action Indication Function Reduce water level down to lower end of measuring range A Select parameter CAL L After a short time a hexadecimal number flashes Lower end of measuring range is calibrated Press the ...

Страница 21: ... Off delay in progress MAX LED lights up red Delay time elapsed MAX output contacts 21 23 closed 22 23 open Setting the MIN MAX switchpoints Select parameter AL Lo enter and save the desired percentage MIN switchpoint is set between 0 100 Select parameter AL Hi enter and save the desired percentage MAX switchpoint is set between 0 100 Level switch NRS 2 51 only Setting pump switchpoints fill contr...

Страница 22: ...nction In operating mode Water level between MIN and MAX Select Test parameter Press and hold the pushbutton MAX LED flashes red Off delay in progress MAX LED lights up red for 3 seconds MAX output contact 21 23 closed 22 23 open The MIN and MAX LED are not lit for 1 second MIN output contact 16 18 open 17 18 open MAX output contact 21 23 open 22 23 closed MIN LED flashes red Off delay in progress...

Страница 23: ...right flashes 000X The second digit can be entered Repeat the last two steps until the password has been entered in full The entered password is displayed XXXX The password is entered in full Press and hold the pushbutton donE The correct password was entered The parameter may be edited FAiL The wrong password was entered The parameter is still password protected quit Processing time has elapsed S...

Страница 24: ...ary Check electrical connection Level transmitter defective measuring current 20 mA Check level transmitter and replace if necessary Check electrical connection E 012 Lower and upper ends of measuring range wrong way round Reset measuring range E 013 MIN switchpoint higher than MAX switch point Reset switchpoints E 097 Walkthrough application error Internal error Replace equipment E 098 Walkthroug...

Страница 25: ...ss HF interference using hinged shell ferrite rings Replacing taking the equipment out of service Disposal The equipment must be disposed of in accordance with statutory waste disposal regulations n Switch off the supply voltage and cut off power to the equipment n Remove the upper and lower terminal strips Fig 7 n Insert a screwdriver on the right and left between the terminal strip and the front...

Страница 26: ...26 NRS 2 50 NRS 2 51 Installation Operating Manual 819179 05 For your notes ...

Страница 27: ...27 NRS 2 50 NRS 2 51 Installation Operating Manual 819179 05 For your notes ...

Страница 28: ... AG Bremen Printed in Germany GESTRA AG Münchener Straße 77 28215 Bremen Germany Tel 49 421 3503 0 Fax 49 421 3503 393 E mail info de gestra com Website www gestra com You can find our authorised agents around the world at www gestra com ...

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