GESTRA NRR 2-50 Original Installation & Operating Manual Download Page 25

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NRR 2-50, NRR 2-51 - USA - Installation & Operating Manual -

850699-00

Operating the level controller

Meaning of codes on the 7-segment display

Code

Meaning

Indicated when rotary knob is turned clockwise:
AL.Hi

Alarm High

MAX switchpoint

Adjustable between 0 and 100%

AL.Lo

Alarm Low

MIN switchpoint

Set point

Proportional band Adjustable between 0 and 100%

Time integral

Integral action time, adjustable between 0 and 100 seconds

Motor travel time Valve travel time (NRR 2-50 only), adjustable

between 10 and 600 seconds

tESt

Test

Test of output relays

CAL.L

Calibrate Low Only if NRG 21-.. or

NRG 26-21 level

electrode is connected

Sets lower bound of measuring range

CAL.P

Calibrate %

Adjustable between 25 and 100%

CAL.H

Calibrate High

Sets upper bound of measuring range

Indicated in parameterization mode
quit

Quit

Entry is not confirmed

done

Done

Entry is confirmed

Indicated in the event of errors
E.005

Error

Faulty level electrode/transmitter, measuring voltage/current too low

E.006

Error

Faulty level electrode/transmitter, measuring voltage/current too high

E.013

Error

MIN switchpoint higher than MAX switchpoint

Fig. 8

Valve

opens

MAX

LED

red
MIN

LED

red

Rotary knob

with

integrated

push-button

OO75

7-seg-

ment

display

Valve

closes

Yellow

LED

Summary of Contents for NRR 2-50

Page 1: ...Original Installation Operating Manual 850699 00 Level Controller NRR 2 50 NRR 2 51 EN USA English ...

Page 2: ... data 12 Rating plate identification 14 Factory default settings 15 Changing the factory default settings 16 Dimensions of the NRR 2 50 2 51 18 Preparing for installation 19 Installation 20 Installing in the control cabinet 20 In the control cabinet Electrically connecting the level controller 21 Wiring diagram for level controller NRR 2 50 21 Wiring diagram for level controller NRR 2 51 22 Connec...

Page 3: ... service 27 Setting parameters 27 Operation alarm and test 28 Setting switchpoints and control parameters 28 Level controller NRR 2 50 indications 29 Level controller NRR 2 51 indications 29 Checking the function of the MIN MAX output contacts 30 Fault indications and troubleshooting 31 Indications diagnosis and corrective action 31 Important notes 31 Action against high frequency interference 31 ...

Page 4: ...699 00 08 2021cm Copyright All rights reserved Any misuse particularly reproduction and dissemination to third parties is not permitted The General Terms Conditions of GESTRA AG apply Scope of supply product package NRR 2 50 1 level controller NRR 2 50 1 Installation Operating Manual NRR 2 51 1 level controller NRR 2 51 1 Installation Operating Manual ...

Page 5: ...n full and follow all instructions 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 acces sible 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...

Page 6: ...ous situation 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 ...

Page 7: ... point of the plant The operating point describes the operating parameters within which a plant or boiler is operated in its nominal range In a steam boiler for example these parameters would be output pressure and temperature The design data may be a lot more stringent however A boiler that is operated at 145 psi 10 bar and 356 F 180 C may be designed to withstand a pressure of 870 psi 60 bar and...

Page 8: ... in all applications please also read the Installation Operating Manuals for the system components used You can find the latest Installation Operating Manuals on our website http www gestra com Improper use There is a danger of death due to explosion if the equipment is used in potentially explosive atmospheres Do not use the equipment in potentially explosive atmospheres Do not bring any equipmen...

Page 9: ... plant before performing connection work Check that the plant is not carrying live voltage before commencing work Attempts to repair the equipment will cause the plant to become unsafe The NRR 2 50 NRR 2 51 level controller may only be repaired by the manufacturer GESTRA AG Only replace faulty equipment with identical equipment from GESTRA AG Basic safety information ...

Page 10: ...nd brought into service by qualified and competent staff Operation Boiler service technician Staff trained by the plant operator Maintenance work Specialist staff Fitting and maintenance work may only be performed by authorized staff who have undergone specific training Refits Specialist staff Persons trained by the plant operator to work with pressure and temperature Notes on product liability Th...

Page 11: ...utput contact switches and the MIN or MAX LED lights up Level controller NRR 2 51 The level controller works with an electro pneumatically actuated control valve as a continuous controller with proportional plus integral control action PI controller In the event of deviations from the set point it outputs a current of 4 20 mA as manipulated variable Y The controller can be configured for fill or d...

Page 12: ...ax output load 500 ohms e g for an actual value display optional Indicators and controls 1 rotary knob with integrated push button for testing the MIN MAX alarm and setting the parameters 1 4 digit 7 segment LED display green 2 red LEDs for MIN MAX alarm 2 yellow LEDs for control valve opening closing NRR 2 50 only 1 4 pole code switch for configuration Terminal box Terminal box material base of b...

Page 13: ...pply 500 V AC output 2500 V Ambient temperature at power on 32 131 F 0 55 C in operation 14 131 F 10 55 C Transport temperature 4 F 176 F 20 80 C 100 hours only switch on after a defrosting period of 24 hours Storage temperature 4 158 F 20 70 C only switch on after a defrosting period of 24 hours Relative humidity Max 95 non condensing Technical data ...

Page 14: ...NRR 2 51 250V T2 5A IP IP20 40 40 GESTRA AG Münchener Str 77 28215 Bremen Made in Germany Tamb 55 C T131 F 3s 3s OUT 4 20mA _ M0 5A 4W _ 1 2 3 24V 20 NRR 2 51 Rating plate bottom Type designation Supply voltage Fuse provided by customer Power consumption Disposal information Approvals Fig 2 Protection Safety information Output contacts Ambient temperature Connection of level electrode level transm...

Page 15: ...n Dead band 5 of set point n Valve travel time tt 40 s n Calibration value CAL P 100 n Fill control function n MIN MAX output contact set as MAX alarm Code switch c S1 S2 S3 S4 OFF Level controller NRR 2 51 n Off delay 3 s default n Input set as voltage input please change using code switch S3 n MAX switchpoint AL Hi 80 n MIN switchpoint AL Lo 20 n Set point SP 50 n Proportional band Pb 20 of set ...

Page 16: ...ion 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 Detach the lower terminal strip Fig 3 n Insert a screwdriver between the terminal strip and the front frame to the right and left of the arrow markings n Release the terminal strip on the right and left by turning the screwdriver in the direction of the arr...

Page 17: ...ler NRR 2 50 S 1 S 2 S 3 Output contact set for MAX alarm OFF Output contact set for MIN alarm ON Level Controller NRR 2 50 NRR 2 51 Input for connection of level transmitter NRGT 26 2 ON Fill control OFF Drain control ON gray factory setting Attention When connecting the NRGT 26 2 level transmitter please set the upper and lower bounds of the measuring range only on the transmitter To do this ple...

Page 18: ...ation Operating Manual 850699 00 Dimensions of the NRR 2 50 NRR 2 51 1 Upper terminal strip 2 Lower terminal strip Key 3 Terminal box 4 Support rail TH 35 EN 60715 Fig 5 4 3 1 2 1 81 in 46 mm 2 91 in 74 mm 4 72 in 120 mm 0 6 in 15 mm ...

Page 19: ...chnical data see page 12 Do not operate the equipment if the temperature is below freezing At temperatures below freezing use a suitable heat source e g control cabinet heater etc Connect all parts of the plant to a central grounding point to prevent equalizing currents Use UV resistant cable ducts for routing the connecting cable Take further measures to protect the equipment from lightning insec...

Page 20: ... 2 51 USA Installation Operating Manual 850699 00 Installation Installing in the control cabinet The NRR 2 50 NRR 2 51 level controller is clipped onto a type TH 35 EN 60715 support rail in the control cabinet Fig 5 4 ...

Page 21: ...V DC with 0 5A medium time lag fuse provided by customer 6 Level transmitter NRGT 26 2 4 20 mA with grounding point Max 3 NRS NRR 2 5 units can be connected series connection 7 Central grounding point CGP in control cabinet 8 Output contact for control valve actuation 9 MIN MAX output contact off delay 3 seconds 0 Actual value output 4 20 mA optional Key 6 NRR 2 50 Fig 6 8 9 MIN MAX M0 5A medium t...

Page 22: ...24 V DC with 0 5A medium time lag fuse provided by customer 6 Level transmitter NRGT 26 2 4 20 mA with grounding point Max 3 NRS NRR 2 5 units can be connected series connection 7 Central grounding point CGP in control cabinet 8 MIN output contact off delay 3 seconds 9 MAX output contact off delay 3 seconds 0 Output 4 20 mA manipulated variable Y Key 6 NRR 2 51 Fig 7 8 9 0 MAX MIN 5 7 M0 5A medium...

Page 23: ...desired switching functions Provide an external 2 5A slow blow fuse for the output contacts When inductive loads are switched off voltage spikes are produced that may have a major ad verse effect on the operation of control and measuring systems Connected inductive loads must therefore have interference suppression RC combination as specified by the manufacturer Attention n Do not use unused termi...

Page 24: ...lease use a shielded multi core TC ER control cable with minimum wire size AWG18 e g OELFLEX CONTROL TM CY 5G1 to connect the equipment Max length 328 ft 100 m Connect the shield as shown in the wiring diagram Attention n Please bring the equipment into service as described in the NRGT 26 2 Installa tion Operating Manual n Route the connecting cable between items of equipment separately from power...

Page 25: ... tESt Test Test of output relays CAL L Calibrate Low Only if NRG 21 or NRG 26 21 level electrode is connected Sets lower bound of measuring range CAL P Calibrate Adjustable between 25 and 100 CAL H Calibrate High Sets upper bound of measuring range Indicated in parameterization mode quit Quit Entry is not confirmed done Done Entry is confirmed Indicated in the event of errors E 005 Error Faulty le...

Page 26: ...d Pb 20 of set point 16 1 26 in 32 mm If the measuring range is 100 7 87 in 200 mm and the set point is 80 160 mm the proportional band will be 16 1 26 in 32 mm or in the range from 5 04 in 128 mm to 7 56 in 192 mm Integral action time ti Larger Slow correction of deviations Reacts slowly Smaller Fast correction of deviations control loop may tend to overshoot Reacts quickly Guide to setting contr...

Page 27: ...4th digit can now be changed using the rotary knob Turning clockwise increases the value turning anti clockwise reduces the value When your entries are complete press and hold the push button within 3 s done is briefly displayed Next the display toggles between the parameter and the new value Your entry is confirmed System switches back to the parameter If you do not confirm your entry within 3 s ...

Page 28: ...age The MAX switchpoint is set between 0 100 Setting the set point Select parameter SP enter and save the desired percentage The set point is set between 0 100 Please take MIN MAX switchpoint settings into consider ation Setting the proportional band Select parameter Pb enter and save the desired percentage The proportional band is set between 0 100 Setting the integral action time Select paramete...

Page 29: ...ntacts 21 23 closed 22 23 open Operation Action Indication Function Actual value set point Valve and MIN MAX LEDs are not lit Valve output contact 16 17 19 open MIN MAX output contacts 21 23 open 22 23 closed Value above or below set point Value above or below set point Valve OPEN LED flashes yellow Control valve opens valve output contact 16 19 closed or Valve CLOSED LED flashes yellow Control va...

Page 30: ...AX LEDs 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 MIN LED lights up red for 3 seconds MIN output contact 16 18 closed 17 18 open Test complete release push button Equipment switches to operating mode Note If you continue holding the push button the test sequence will start again You can can...

Page 31: ...itter and replace if neces sary Check electrical connection E 006 Faulty level transmitter measuring current 20 mA Check level transmitter and replace if neces sary Check electrical connection E 013 MIN switchpoint higher than MAX switch point Reset switchpoints In the event of a malfunction the MIN and MAX alarm is triggered Action against high frequency interference Further information High freq...

Page 32: ...the arrow markings n Release the terminal strip on the right and left by turning the screwdriver in the direction of the arrow n Detach the terminal strips Fig 9 n Release the white slider holder at the bottom of unit and detach the unit from the support rail Taking out of service Proceed as follows UL components NRR 2 50 and NRR 2 51 level controllers are registered under XACN E513189 Disposal Di...

Page 33: ...33 NRR 2 50 NRR 2 51 USA Installation Operating Manual 850699 00 For your notes ...

Page 34: ...34 NRR 2 50 NRR 2 51 USA Installation Operating Manual 850699 00 For your notes ...

Page 35: ...35 NRR 2 50 NRR 2 51 USA Installation Operating Manual 850699 00 For your notes ...

Page 36: ...48 00 GESTRA AG Bremen GESTRA AG Münchener Straße 77 28215 Bremen Germany Tel 49 421 3503 0 Fax 49 421 3503 393 e mail info de gestra com Web www gestra com You can find our authorized agents around the world at www gestra com ...

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