GESTRA NRR 2-50 User manual

EN
English
Original Installation &
Operating Manual
819180-05
Level Controller
NRR 2-50
NRR 2-51

2NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Contents
Page
Important notes
Usage for the intended purpose...............................................................................................................4
Function..................................................................................................................................................4
Safety note..............................................................................................................................................5
Directives and standards
VdTÜV Bulletin “Wasserstand 100” (Water Level 100) .............................................................................5
LVD (Low Voltage Directive) and EMC (Electromagnetic Compatibility) .....................................................5
ATEX (Atmosphère Explosible) .................................................................................................................5
Notes on the Declaration of Conformity/Manufacturer’s Declaration ..................................................5
Approval for marine use ..........................................................................................................................5
Technical data
NRR 2-50, NRR 2-51...............................................................................................................................6
Product package.....................................................................................................................................7
Name plate/identification ........................................................................................................................8
Installation
Installation in the door of the control cabinet ...........................................................................................9
Dimensions of the NRR 2-50 / NRR 2-51...............................................................................................10
Key .......................................................................................................................................................10
Installation in a control cabinet..............................................................................................................10
In the control cabinet: Wiring the level controller
Wiring diagram for level controller NRR 2-50.........................................................................................11
Key .......................................................................................................................................................11
Wiring diagram for level controller NRR 2-51.........................................................................................12
Key .......................................................................................................................................................12
Supply voltage connection.....................................................................................................................13
Connecting the output contacts.............................................................................................................13
Connecting the level electrode/level transmitter ....................................................................................13
Output of manipulated variable Y or connection of actual value output (optional) ...................................13
Tools.....................................................................................................................................................13

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NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Contents
Page
continued
In the system: Wiring the level electrode/transmitter
Connecting the level electrode/level transmitter ....................................................................................14
Factory settings ..................................................................................................................................14
Changing the factory settings
Switching the input and changing the function of the level electrode/transmitter...................................15
Operating the level controller
Meaning of codes on the 7-segment display .........................................................................................17
Setting the measuring range .................................................................................................................18
Additional information for setting control parameters ............................................................................18
Bringing into service
Setting parameters................................................................................................................................19
Setting the measuring range .................................................................................................................20
Operation, alarm and testing
Setting switchpoints and control parameters.........................................................................................21
Indications of level controller NRR 2-50.................................................................................................22
Indications of level controller NRR 2-51.................................................................................................22
Checking the function of the MIN/MAX output contacts .......................................................................23
Password protection..............................................................................................................................24
Troubleshooting
Indications, diagnosis and remedies......................................................................................................25
Further information
Action against high-frequency interference ...........................................................................................26
Replacing/taking the equipment out of service ......................................................................................26
Disposal................................................................................................................................................26

4NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Important notes
Usage for the intended purpose
The NRR 2-50, NRR 2-51 level controller is used in combination with NRG 2.-.. level electrodes or
NRGT 26-. level transmitters as a limit switch and water level controller, e.g. in steam boiler and hot
water installations, or in condensate and feedwater tanks. The level controller indicates when a MIN and
MAX water level has been reached, and opens or closes a control valve.
The NRR 2-50, NRR 2-51 level controller can be combined in a circuit with the NRG 21-.. or NRG 26-21
level electrodes and the NRGT 26-. level transmitters.
The NRR 2-50, NRR 2-51 level controller processes the voltage signals from the NRG 2..-.. level elec-
trodes or the current signal from the NRGT 26-. level transmitters. These voltage and current signals
vary depending on the level. These input signals are normalised in the controller to 0 and 100% of the
boiler measuring range, and shown as an actual value on the 7-segment LED display.
Level controller NRR 2-50: The level controller works with an electrically actuated control valve as a
3-position stepping controller with proportional-plus-integral control action (PI controller). If the actual
value deviates from the set point, the electric actuator is triggered by two output contacts and two
flashing LEDs indicate whether the control valve is opening or closing.
The controller can be configured for fill or discharge control.
A further output contact indicates when a MIN or MAX water level is reached (the desired function can
be selected by a switch). After the off delay has elapsed, the output contact switches over 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 (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 discharge control.
If the MIN or MAX water level is reached, the MIN or MAX output contact switches over in the level
controller after the off delay, and the MIN or MAX LED lights up.
Level controller NRR 2-50, NRR 2-51: Faults or malfunctions in the level electrode, the level transmit-
ter, the electrical connection or the settings are indicated as error codes 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 NRR 2-50, NRR 2-51 level controller, 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.
For external level indication, the NRR 2-50 level controller is optionally available with a 4 - 20 mA
actual value output.
Function

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NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
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
(installation, 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.
Important notes
Directives and standards
VdTÜV Bulletin “Wasserstand 100” (Water Level 100)
The NRR 2-50, NRR 2-51 level controller, in combination with the NRG 2.-.. level electrode and
NRGT 26-. level transmitter, has type approval in accordance with VdTÜV Bulletin “Wasserstand 100”
(Water Level 100), which describes the requirements for water level control and limiting equipment for
boilers.
ATEX (Atmosphère Explosible)
The equipment must not be used in potentially explosive atmospheres, in accordance with European
Directive 2014/34/EU.
LVD (Low Voltage Directive) 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 Declaration of Conformity/Manufacturer's Declaration is available at www.gestra.com
Documents
, or can be requested from us.
Approval for marine use
In combination with the NRGT 26-. level transmitter, the
NRR 2-5.. level controller is approved for
marine use.
continued

6NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
NRR 2-50, NRR 2-51
Supply voltage
24 VDC +/– 20%
Fuse
external 0.5A (semi-delay)
Power consumption
4 W
Connecting a level electrode/level transmitter (switch-selectable)
1 input for NRG 21-.. and NRG 26-21 level electrode, 3-pole with shield, or
1 analogue input 4-20 mA, e.g. for the NRGT 26-. level transmitter, 2-pole with shield.
Supply voltage to level electrode
12 VDC
Outputs:
NRR 2-50: 2 volt-free relay contacts, 8 A 250 V AC / 30 V DC cos ϕ= 1 (control valve open/closed).
1 volt-free relay contact, 8 A 250 V AC / 30 V DC cos ϕ= 1.
Off delay 3 seconds (MIN/MAX alarm, switch-selectable)
NRR 2-51: 2 volt-free relay contacts, 8 A 250 V AC / 30 V DC cos ϕ= 1.
Off delay 3 seconds (MIN/MAX alarm)
1 analogue output 4-20 mA, max. output load 500 ohms (manipulated variable Y).
Inductive loads must have interference suppression (RC combination) as per the manufacturer's
specifications.
NRR 2-50: 1 analogue output 4-20 mA, max. output load 500 ohms, e.g. for actual value indication
(optional).
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,
2 amber LEDs for control valve opening/closing (NRR 2-50 only)
1 four-pole code switch for configuration.
Housing
Housing material: base of black polycarbonate; front of grey polycarbonate
Conductor size: 1 x 4.0 mm2solid per wire, or
1 x 2.5 mm2per stranded wire with sleeve to DIN 46228, or
2 x 1.5 mm2per stranded wire with sleeve to DIN 46228 (min. ∅0.1 mm)
Terminal strips can be removed separately
Housing attachment: Mounting clip on support rail TH 35, EN 60715
Electrical safety
Pollution degree 2 for installation in control cabinet with protection rating IP 54, fully insulated
IP rating
Housing: IP 40 to EN 60529
Terminal strip: IP 20 to EN 60529
With panel adapter: IP 65 to EN 60529
Weight
approx. 0.2 kg
Technical data

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NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
NRR 2-50, NRR 2-51
Ambient temperature
when system is switched on 0 ° ... 55 °C
in operation –10 ... 55 °C
Transport temperature
–20 ... +80 °C (<100 hours), only switch on after a defrosting period of 24 hours.
Storage temperature
–20 ... +70 °C, only switch on after a defrosting period of 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)
Technical data
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
continued
continued

8NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Niveauregler Level Controller Régulateur de niveau
19 20
IP40 (IP20)
16 17 MIN
3s
3s
MAX
18 21 22 23
Betriebsanleitung beachten See installation instructions Voir instructions de montage
NRR 2-51
Tamb = 55°C (131°F)T
250V ~ T2,5A
GESTRA AG
Münchener Str.77 28215 Bremen Made in Germany
OUT 4-20mA
500Ω
+
_
M0,5A
4W +
_
1
+12V
+
_
IN 4-20mA
NRG 2..-..
1 2 3 4 5 6 7 8
TÜV.WR. -425XX
3
24V
±20%
Niveauregler Level Controller Régulateur de niveau
19 20
IP40 (IP20)
16 17 MIN
3s
3s
MAX
18 21 22 23
Betriebsanleitung beachten See installation instructions Voir instructions de montage
NRR 2-51
Tamb = 55°C (131°F)T
250V ~ T2,5A
GESTRA AG
Münchener Str.77 28215 Bremen Made in Germany
OUT 4-20mA
500Ω
+
_
M0,5A
4W +
_
1
+12V
+
_
IN 4-20mA
NRG 2..-..
1 2 3 4 5 6 7 8
TÜV.WR. -425XX
3
24V
±20%
Niveauregler Level Controller Régulateur de niveau
MIN
MAX
19 20 16 17 18 21 22 23
Betriebsanleitung beachten See installation instructions Voir instructions de montage
NRR 2-50
Tamb = 55°C (131°F)T
3s
250V ~ T2,5A
IP (IP20)40
GESTRA AG Münchener Str.77 28215 Bremen Made in Germany
OUT 4-20mA
500Ω
+
_
M0,5A
4W +
_
1
+12V
+
_
IN 4-20mA
NRG 2..-..
1 2 3 4 5 6 7 8
TÜV.W . -425R XX
3
24V
±20%
Niveauregler Level Controller Régulateur de niveau
MIN
MAX
19 20 16 17 18 21 22 23
Betriebsanleitung beachten See installation instructions Voir instructions de montage
NRR 2-50
Tamb = 55°C (131°F)T
3s
250V ~ T2,5A
IP (IP20)40
GESTRA AG
Münchener Str.77 28215 Bremen Made in Germany
OUT 4-20mA
500Ω
+
_
M0,5A
4W +
_
1
+12V
+
_
IN 4-20mA
NRG 2..-..
1 2 3 4 5 6 7 8
TÜV.W . -425R XX
3
24V
±20%
Name plate/identification
Name plate, bottom
Type
designation
Supply
voltage
Fuse,
provided
on site
Power
consumption
Disposal
note
Approvals
Fig. 2
IP rating
Safety
note
Output
contacts
Ambient
temperature
Technical data
Connection of
level electrode/
level transmitter
Manipulated
variable Y
Name plate NRR 2-50, top Name plate NRR 2-51, top
Manufacturer
Actual value
output
(optional)
External
fuse for
output contacts
continued

9
NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Installation
The small panel adapter with rotary knob, stock code 441553, enables the controller to be installed 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

10 NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Installation
Dimensions of the NRR 2-50 / NRR 2-51
1Upper terminal strip
2Lower terminal strip
Key
Installation in a 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. 1 4
3Housing
4Support rail TH 35, EN 60715
Fig. 1
43
1
2
46
74
120 15

11
NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
0.5A
(semi-
delay)
In the control cabinet: Wiring the level controller
Wiring diagram for level controller NRR 2-50
5Supply voltage connection 24 V DC with 0.5A semi-delay fuse provided on site
6Level electrode NRG 21-.. , NRG 26-21.
Max. three NRS/NRR 2-5.. units can be connected (connection in parallel).
7Level transmitter NRGT 26-., 4-20mA, with earthing point.
Max. three NRS/NRR 2-5.. units can be connected (series connection).
8Central earthing point (CEP) in control cabinet
9Output contact for control valve actuation
0MIN/MAX output contact, off delay 3 seconds
aActual value output 4-20mA
Key
57
8
09
6
NRR 2-50
Fig. 3
9 0
MIN/MAXMIN/MAX
0.5A
(semi-
delay)
5a a
8

12 NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
In the control cabinet: Wiring the level controller
Wiring diagram for level controller NRR 2-51
5Supply voltage connection 24 V DC with 0.5A semi-delay fuse provided on site
6Level electrode NRG 21-.. , NRG 26-21.
Max. three NRS/NRR 2-5.. units can be connected (connection in parallel).
7Level transmitter NRGT 26-., 4-20mA, with earthing point.
Max. three NRS/NRR 2-5.. units can be connected (series connection).
8Central earthing point (CEP) in control cabinet
9MIN output contact, off delay 3 seconds
0MAX output contact, off delay 3 seconds
aOutput 4-20 mA, manipulated variable Y
Key
5 7
6
NRR 2-51
Fig. 4
0.5A
(semi-
delay)
a
MIN MAX
9 0
a
8
MAXMIN
0.5A
(semi-
delay)
09
58
continued

13
NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
In the control cabinet: Wiring the level controller
Supply voltage connection
The equipment is supplied with 24 V DC and has an external 0.5A semi-delay fuse. Please use a safety
power supply unit with reliable electrical isolation.
This power supply unit must be electrically isolated from dangerous live voltages and meet the require-
ments for double or reinforced insulation in accordance with one of the following standards:
DIN EN 50178, DIN EN 61010-1, DIN EN 60730-1 or DIN EN 60950.
Connecting the level electrode/level transmitter
To connect the equipment, please use a shielded, multi-core control cable with a minimum conductor
size of 0.5mm2, e.g. LiYCY 4 x 0.5mm2, maximum length 100m.
Max. three NRS/NRR 2-5.. switches/controllers can be connected to one level electrode or one level
transmitter.
Wire the terminal strip as shown in the wiring diagram. Fig. 3, 4
Connect the shield as shown in the wiring diagram.
Route the connecting cable between items of equipment separately from power lines.
Connecting the output contacts
Wire the upper terminal strip 1(terminals 16-23) in line with the desired switching functions.
Provide an external slow-blow 2.5A 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
nScrewdriver size 3.5 x 100mm, fully insulated to VDE 0680-1.
Attention
nDo not use unused terminals as support terminals.
Output of manipulated variable Y or connection of actual value output (optional)
For connection, please use a shielded, multi-core control cable with a minimum conductor size of
0.5mm2, e.g. LiYCY 2 x 0.5mm2, maximum length 100m.
Please note the output load of max. 500 ohms (output of manipulated variable Y).
Wire the terminal strip as shown in the wiring diagram. Fig. 3, 4
Connect the shield just once to the central earthing point (CEP) in the control cabinet.
Route the connecting cable between items of equipment separately from power lines.
Any item of equipment that you wish to connect to the terminals for the output of manipulated variable Y
or actual value output 4-20 mA (optional) must be certified to have at least double or reinforced insula-
tion to DIN EN 50178 or DIN 61010-1 or DIN EN 60730-1 or DIN EN 60950 between the current loop and
live parts of the equipment that are not supplied with safety extra-low voltage (SELV).
continued

14 NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
In the system:
Wiring the level electrode/transmitter
Connecting the level electrode/level transmitter
The NRR 2-50, NRR 2-51 level controller can be combined in a circuit with the NRG 21-.. or NRG 26-21
level electrodes and the NRGT 26-. level transmitter.
To connect the equipment, please use a shielded, multi-core control cable with a minimum conductor
size of 0.5mm2, e.g. LiYCY 4 x 0.5mm2, maximum length 100m.
Connect the shield as shown in the wiring diagram.
Attention
nPlease bring the equipment into service as described in the Installation & Operating
Manuals of the NRG 21-.., NRG 26-21 or NRGT 26-..
nRoute the connecting cable between items of equipment separately from power lines.
nThe level transmitter must be connected to its own dedicated power supply.
Factory settings
Level controller NRR 2-50
nOff delay: 3 sec. (fixed)
nInput wired as a voltage input for connecting an
NRG 21-.. or NRG 26-21 level electrode.
nMAX switchpoint AL.Hi = 80%
nMIN switchpoint AL.Lo = 20%
nSet point SP = 50%
nProportional band Pb = 20% of set point
nIntegral action time ti = 0%
nDead band = +/– 5% of set point
nValve travel time tt = 40 s
nCalibration value CAL.P = 100%
nFill control function
nMIN/MAX output contact set as MAX alarm
nPassword PW: oFF
Code switch c: All switches OFF
Level controller NRR 2-51
nOff delay: 3 sec. (fixed)
nInput wired as a voltage input for connecting an
NRG 21-.. or NRG 26-21 level electrode.
nMAX switchpoint AL.Hi = 80%
nMIN switchpoint AL.Lo = 20%
nSet point SP = 50%
nProportional band Pb = 20% of set point
nIntegral action time ti = 0%
nDead band = +/– 5% of set point
nCalibration value CAL.P = 100%
nFill control function
n Password PW: oFF
Code switch c: All switches OFF

15
NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
The upper terminal strip of the equipment is 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 strip (installation,
removal, connecting cables).
Danger
Switching the input and changing the function of the level electrode/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:
sSwitch off the supply voltage.
nRemove the lower terminal strip. Fig. 5
nInsert a screwdriver on the right and left between the terminal strip and the front frame, as shown
by the arrows.
nRelease the terminal strip on the right and left sides, by turning the screwdriver in the direction of
the arrow.
nRemove the terminal strip.
Changing the factory settings
When your changes are complete:
nPut on the lower terminal strip.
nSwitch the supply voltage back on. The equipment restarts
Fig. 5
c

16 NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
If you wish to switch the input or change the function, set switches S1 to S3 of code switch cas
shown in the table Fig. 6.
Changing the factory settings
Switching the input and changing the function of the level electrode/transmitter
Fig. 6
Code switch c
Level controller NRR 2-50 S1 S2 S3
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 electrode NRG
21-.. or NRG 26-21 OFF
Input for connection of level
transmitter NRGT 26-. * ON
Fill control OFF
Discharge control ON
grey = factory setting
Attention
* When connecting the NRGT 26-. level transmitter, please set the upper and lower ends
of the measuring range only in the transmitter. Please pay attention to the NRGT 26-.
Installation & Operating Manual when doing this.
Do not change the settings of switch S4 on code switch c!
Toggle switch, white
continued
continued

17
NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Operating the level controller
Meaning of codes on the 7-segment display
Code Meaning
Appears when rotary knob is turned clockwise:
AL.Hi Alarm High MAX switchpoint
Adjustable between 0 and 100%AL.Lo Alarm Low MIN switchpoint
SP Set point Set point
Pb Proportional band Adjustable between 0 and 100%
ti Time integral Integral action time, adjustable between 0 and 100 seconds
tt Motor travel time Valve travel time (NRR 2-50 only), adjustable
between 10 and 600 seconds
tESt Test Output relays are tested
PW Password on = password protection is enabled
oFF = password protection is disabled
Factory setting 1902 (cannot be changed)
CAL.L Calibrate Low 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 High 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
E.005 Error Level electrode/transmitter defective, measuring voltage/current too low
E.006 Error Level electrode/transmitter defective, measuring voltage/current too high
E.012 Error Lower and upper ends of measuring range wrong way round
E.013 Error MIN switchpoint higher than MAX switchpoint
C
Fig. 7
Valve
opens
MAX LED
red
MIN LED
red
Rotary knob
with
integrated
pushbutton
OO75 OO75
7-segment
display
Valve
closes
Amber
LED

18 NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Operating the level controller
Setting the measuring range
Attention
When connecting the NRGT 26-. level transmitter, please set the upper and lower end of
the measuring range only in the transmitter.
Parameter Control deviation Control valve
Proportional
band Pb
Larger Large remaining deviation Responds slowly
Smaller Small remaining deviation Responds quickly and may continually open/
close
Example
Measuring range 100% = 200 mm of sightglass
Set point SP = 80% of measuring range = 160 mm
Proportional band Pb = +/- 20% of set point = +/- 16% = +/- 32 mm
If the measuring range is 100% (200 mm) and the set point is 80% (160 mm), the
proportional band will be +/- 16% (+/- 32 mm) or in the range of 128 to 192 mm.
Integral
action
time ti
Larger Slow correction of deviations Responds slowly
Smaller Fast correction of deviations, control
loop may tend to overshoot Responds quickly
Additional information for setting control parameters
ALower end of measuring range, adjustable
BUpper end of measuring range, adjustable
CMeasuring range [mm] = xxx%
DInactive range
EMaximum 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
NRG 2.-..
NRGT 26-.
D
D
37
26
B
CE
continued

19
NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Starting
Action Indication Function
Switch on the supply voltage.
Water level between MIN and
MAX.
7-segment display shows
software and equipment
version
System test, takes approx. 3 sec.
7-segment display shows
actual value System switches to operating mode
Setting parameters
Action 7-segment display Function
Turn rotary knob until desired
parameter is shown
Display toggles between
parameter and saved value. Selecting the parameter
Press and hold the pushbutton
(on rotary knob) First digit (0000) flashes. Parameterization mode active. First digit can be
changed.
Turn rotary knob A new value is displayed. Turning clockwise increases the value, turning
anti-clockwise reduces the value.
Briefly press the pushbutton 2nd, 3rd or 4th digit flashes.
(from right to left)
2nd, 3rd or 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
pushbutton within 3 sec.
done is displayed.
Next, 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 briefly displayed.
After this, the display toggles
between the parameter and the
old value.
If you do not confirm, your entries will not be
applied. Please repeat the procedure. If you do
not confirm, the equipment switches back to the
parameter.
Turn the rotary knob until the next parameter is shown.
Or turn the rotary knob until the actual value is displayed.
Or after 30s, the actual value is displayed automatically.
Bringing into service
Setting parameters
Fig. 7
Valve
opens
MAX LED
red
MIN LED
red
Rotary knob
with
integrated
pushbutton
OO75 OO75
7-segment
display
Valve
closes
Amber
LED
If password protection is enabled, you must enter the password before you can change
parameters. For the password, see page 24.

20 NRR 2-50, NRR 2-51 - Installation & Operating Manual - 819180-05
Bringing into service continued
Setting the measuring range
Note
nAdjusting 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 1
Action Indication Function
Reduce water level 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 pushbutton. The current hexadecimal number flashes.
Press and hold the pushbutton
again within 3 sec.
done is displayed. After this, the display toggles
between CAL.L and the hexadecimal number.
After a short time, 0000% appears.
Input is confirmed.
(actual value output = 4 mA)
Fill tank to upper end of measuring range B.
Select parameter CAL.H and
press pushbutton.
After a short time, a hexadecimal number
flashes.
Upper end of measuring
range is calibrated.
Press the pushbutton. The current hexadecimal number flashes.
Press and hold the
pushbutton again within 3 sec.
done is displayed. After this, the display
toggles between CAL.H and the hexadecimal
number. After a short time, 0100% appears.
Input is confirmed.
(actual value output = 20 mA)
Level electrode NRG 2.-.. only : Setting the measuring range, option 2
Action Indication Function
Reduce water level 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 pushbutton. The current hexadecimal number flashes.
Press and hold the pushbutton
again within 3 sec.
done is displayed. After this, the display toggles
between CAL.L and the hexadecimal number.
After a short time, 0000% appears.
Input is confirmed.
(actual value output = 4 mA)
Fill tank up to at least 25% of the measuring range.
Select parameter CAL.H. After a short time, a hexadecimal number
flashes.
Calibrate at a percentage of the
measuring range, e.g. 25%.
Press the pushbutton. The current hexadecimal number flashes.
Press and hold the
pushbutton again within 3 sec.
done is displayed. After this, the display
toggles between CAL.H and the hexadecimal
number. After a short time, 0100% appears.
Input is confirmed.
(actual value output = 20 mA)
Select parameter CAL.P and set and save a percentage,
e.g. 25%.
CAL.P interpolates the value measured at CAL.H to find
100% of the measuring range. CAL.P can be adjusted
between 25 and 100%.