Flowserve NRR 2-40 User Manual

NRR 2-40

Installation Instructions 810369-03

Level Controller Type NRR 2-40

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1

Contents

Page

Important Notes

Usage for the intended purpose ..................................................................................... 7

Safety note / Warning ...................................................................................................... 7

Explanatory Notes

Scope of supply ..............................................................................................................8

System description ......................................................................................................... 8

Function ..........................................................................................................................8

Technical data ................................................................................................................ 9

Installation

NRR 2-40 ......................................................................................................................10

Example of installation .................................................................................................35

Wiring

Wiring diagram............................................................................................... 3, 4, 10, 11

Basic Adjustments

CAN bus........................................................................................................................ 12

Node ID .........................................................................................................................12

Factory setting ..............................................................................................................13

Controller NRR 2-40 .....................................................................................................13

Commissioning

NRR 2-40 ......................................................................................................................14

Control range ................................................................................................................14

Adjusting the control range.................................................................................... 14, 15

Establishing switchpoints and proportional band .................................................. 16–19

Calibrating the feedback potentiometer of an external control valve .......................... 20

Operation

Normal operation ..........................................................................................................21

Alarm / High-level alarm / Low-level alarm .................................................................. 21

Relay test high/low level alarm ....................................................................................22

System Malfunctions

Systematic fault finding prodedure ...............................................................................23

System malfunctions 1 to 4 ................................................................................... 24–26

Operation Malfunctions

Fault-finding list for troubleshooting ...................................................................... 26–27

Annex

Factory set default node ID ................................................................................... 28, 29

Assigning/changing node ID......................................................................................... 28

Neutral band .................................................................................................................30

Establishing / changing neutral band .................................................................... 30–32

Declaration of conformity.............................................................................................. 34

2

Wiring Diagram

NRR 2-40 as three-position stepping controller

Paired cable

Paired cable

Fig. 1

Fig. 2

3

Wiring Diagram

NRR 2-40 as continuous controller

Paired cable

Paired cable

Fig. 3

Control terminal
and display unit
URB 1

Terminating resistor
120 Ω

*) CEP = central earthing point

Level switch
NRS 1-42

CEP*)

Voltage supply CAN data line

Fig. 4

4

Level controller
NRR 2-40

Level electrode
NRG16-42

Terminating resistor
120 Ω

Sensor
...

Parts Drawings

1

Fig. 5

7

6

A

A

B

8

5

234

Fig. 6

5

Key

Indicator LED

1

LED 1 – Switchpoint 1
LED 2 – Control valve closing

LED 3 – Control valve opening

LED 4 – Switchpoint 4

LED “Bus status”

2

LED “Power”

3

Enter button / Test mode

4

Decrease button

5

Increase button

6
7

Program button

Code selector switch, 10 poles

8

A

Terminal strip

B

Screws for terminal strip

High-level
not allocated

not allocated

Low-level

MalfunctionAlarm

Multifunction
Multifunction
Multifunction

Multifunction

6

Important Notes

Usage for the intended purpose

Use level controller NRR 2-40 in combination with level electrode NRG 26-40 only
for controlling the liquid level of conductive fluids.

Safety Note

The equipment must only be installed by qualified staff.
Qualified staff are those persons who – through adequate training in electrical

engineering, the use and application of safety equipment in accordance
with regulations concerning electrical safety systems, and first aid & accident
prevention – have achieved a recognised level of competence appropriate
to the installation and commissioning of this device.

Warning

The terminal strip of the NRR 2-40 is live during operation. This presents
the danger of electric shock. Cut off power supply before fixing or
removing the housing lid or terminal strips.

7

Explanatory Notes

Scope of supply

NRR 2-40

1 Level controller type NRR 2-40 (plug-in unit in plastic case with box terminals)
1 Terminating resistor 120 Ω
1 Installation manual

System Description

Use level controller type NRR 2-40 in combination with level electrode type
NRG 26-40 for level control and monitoring. The level controller has the following
functions:

■

Two liquid level limits with one switchpoint each (HIGH-LEVEL alarm, LOW-LEVEL
alarm)

■

Three-position stepping or modulating control within a predefined proportional
band

■

Continuous level monitoring within the control band defined by two preset limits

The NRR 2-40 features an optional output for a standard signal 4 – 20 mA.
The level data are transferred from the electrode NRG 26-40 to the level controller
via a CAN data bus.

Function

At regular intervals the level electrode NRG 26-40 sends a data telegram to the level
controller NRR 2-40. The data are transferred via a CAN bus to DIN ISO 11898,
adopting the CANopen protocol. The transmitted data are then evaluated and
allocated to the manually adjusted switchpoints. Optionally a standard signal
4 – 20 mA is established for external level indication. A relay de-energizing delay
can be set manually with the control terminal and display unit URB 1.

To guarantee the correct functioning and safety of the system the data transmitting
cycle of the level controller is constantly monitored. When the CAN bus line is
interrupted the level controller sends a visual signal to indicate a malfunction and the
relays 1 and 4 will be instantaneously de-energized (alarm position).

GESTRA’s control terminal and display unit URB 1 enables advanced features such
as adjustable energizing and de-energizing delays of the output relays (1– 25 s).

8

Technical Data

Type approval no.

NRR 2-40: TÜV

.

98-399

Input / Output

Interface for CAN bus to DIN ISO 11898 CANopen
Feedback potentiometer 1000Ω

Output – voltage supply for electrodes

Power supply 24V DC, short-circuit protected.
Analogue output 4– 20 mA, load 500Ω for display of actual value (option).
Analogue control output for manipulated variable 4– 20 mA, max. load 500Ω (option).
4 volt-free relay contacts.
Max. contact rating with switching voltages of 24V AC, 115V AC and 230 V AC:
4 A resistive, 0.75 A inductive at cos ϕ 0.5
Max. contact rating with a switching voltage of 24V DC: 4 A.
Contact material: silver, hard-gold plated

Interference suppression

Provide contactor with an external RC combination (100 Ω / 47 nF)

Relay de-energizing delay

Output “

MIN”, “MAX” 3s

Indicators and adjustors

1 red LED for switchpoint “
1 red LED for switchpoint “
2 green LEDs for “
1 green LED “
1 red LED “

CONTROL VALVE OPENING” and “CONTROL VALVE CLOSING”

OPERATION”

BUS MALFUNCTION”

MAX”
MIN”

1 ten-pole code selector switch for setting node ID and baud rate
4 pushbuttons

Proportional band X

p

1 % to 100%

Valve position feedback

0 Ω to 1000 Ω (only when used as three-position stepping controller)

Switching range (dead band) X

Sh

0 % (factory setting) up to 15 %

Supply voltage

230 V ± 10 %, 50/60 Hz
115 V ± 10 %, 50/60 Hz (option)

Power consumption

10 VA

Protection

Case: IP 40 to DIN ISO 60529
Terminal strip: IP 20 to DIN ISO 60529

Admissible ambient temperature

0 °C to 55 °C

Case material

Front panel: polycarbonate, grey
Enclosure: polycarbonate, black

Weight

Approx. 0.8 kg

9

Installation

NRR 2-40

Installation on mounting rail

1. Clip level controller onto mounting rail 35x 15 mm (DIN EN 50022).

2. Align level controller, fig. 19, 20.

Tool

■ Screwdriver (5.5/100)

Wiring

Note that screened multi-core twisted-pair control cable is required, e. g.
UNITRONIC

®

BUS CAN 2 x 2 x ... 2 or RE-2YCYV-fl 2 x 2 x ... 2.

The baud rate (data transfer rate) dictates the cable length between the bus nodes
and the total current consumption of the measuring sensors dictates the conductor
size.

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The baud rate is set via a code switch. Reduce baud rate if cable is longer than
specified in the table. Make sure that all bus nodes have the same settings.

To protect the switching contacts fuse circuit with 2.5 A (anti-surge fuse) or according
to TRD regulations (1.0 A for 72 hrs operation).

When a max. cable length of 1000 m is desired, make sure to modify the baud
rate accordingly. Refer to pages 28 and 29 for more details.

Wiring diagram

See wiring diagrams on pages 3 and 4.

UNITRONIC® is a registered trademark of LAPP Kabelwerke GmbH, Stuttgart

10

Wiring – continued –

Attention

■

Wire equipment in series. Star-type wiring is not permitted.

■

Interlink screens of control cables such that electrical continuity is
ensured and connect them once to the central earthing point (CEP).

■

To protect the switching contacts fuse circuit with 2.5 A (slow blow) or
according to TRD regulations.

■

If more than one system components are connected to a CAN bus
network provide the first and last equipment with a terminating
resistor of 120 Ω. Fig. 4

■

The CAN bus network must not be interrupted while operating.
Any interruption will result in

If the level controller must be replaced, remove terminal
strip Fig. 6.

Before removing the CAN-bus line from the terminal strip disconnect all
relevant system components to avoid malfunction alarms.

Note

■

Connect screen only to designated terminals.

■

The loop resistance must be under 10 Ω.

■

The rated voltage is stated on the name plate.

■

When switching off inductive loads, voltage spikes are produced that
may impair the operation of control and measuring systems. Inductive
loads should therefore be provided with commercial arc suppressor
RC combinations.

■

In spite of correct wiring H.F. interference caused by the installation
may lead to system breakdowns and malfunction messages. If
necessary refer to the “Fault finding list for troubleshooting” on
pages 26 and 27.

HIGH/LOW level alarm!

A

Tool

■ Screwdriver for slotted screws, size 2.5, completely insulated according to

VDE 0680.

11

Basic Adjustments

CAN bus

All level and conductivity controllers and associated electrodes are interconnected
by means of a CAN bus using the CANopen protocol. Every item of equipment
features an electronic address (node ID). The four-core bus cable serves as power
supply and data highway for high-speed data exchange.
The CAN address (node ID) can be set between 1 and 123.

The NRR 2-40 is configured at our works and ready for service with other GESTRA
system components without having to set the node ID.

If several systems of the same kind are to communicate in one CAN bus
network, be sure to assign one node ID for each individual system component.
Refer to pages 28 and 29 for more details.

Node ID

12

Basic Adjustments – continued –

Factory setting

The level controller features the following factory set default values:

■ Baud rate: 250 kb/s

■ Proportional band X

■ Node ID: 040

■ Switchpoint 1: 80 %

■ Switchpoint 4: 20 %

: 20%

P

■ Relay with de-energizing delay switchpoint 1: 3s

■ Relay with de-energizing delay switchpoint 4: 3s

80 %
60%
40 %
20 %

100%

20 %

0%

Fig. 7

Controller NRR 2-40

The controller type NRR 2-40 is specially designed for level control in steam boilers
and feedwater deaerators. The NRR 2-40 is a proportional controller with steady­state deviation. The positive and negative deviation lies within the proportional band
(Xp) preselected by the user.

It is possible to control electric and pneumatic actuators. The control of electric
actuators is accomplished by an analogue signal which, in combination with an
active position feedback coming from the valve, is converted in the controller into a
three-position stepping signal. The control pulses for the electric actuator are
transmitted by a relay incorporated in the controller.

The control of pneumatic actuators is effected by an analogue signal 4– 20 mA.
The analogue signal is transmitted directly from the proportional controller to the
positioner of the pneumatic control valve, which means that an active position
acknowledgement is not possible.

X

values:

P

X

> large permanent deviation, valve reacts sluggishly

P

X

< no permanent deviation, valve may be hunting

P

recommended X

value 30 % – 100 %.

P

13

Commissioning

NRR 2-40

Apply power to the unit.
The four indicator LEDs flash rapidly.

The LED “Power” lights up.
The test cycle takes about two seconds.

Control Range

Desired control range [mm]
Max. control range

Indicator LEDs flash rapidly

LED “Power” illuminated.

Determine the appropriate level
control range for your
system.

Fig. 8

Adjusting the control range

Press button for 3 sec.
Lower liquid level until the lower limit of

the control range is reached.
If necessary first use button to

adjust the upper limit of the control
range.

Press button briefly.

Note:

In the event of a system malfunction, the
LED(s) “Bus status” and/or “Power” will
be flashing rapidly when in program
mode. Quit program mode and
analyse the system malfunction
(see pages 22 – 26).

14

NRG 26-40

37

Lower measuring point

26

LEDs illuminated LEDs flash slowly

3 sec.

LEDs flash LEDs flash rapidly

briefly

LED “Power”

Commissioning – continued –

Adjusting the control range – continued –

Press button briefly.
The lower limit of the desired control

range is now saved.

LEDs illuminated LEDs flash slowly

briefly

Press button briefly.
Raise liquid level until the desired upper

limit of the control range is reached.

Press button briefly.

Press button twice briefly.
The upper limit of the desired control

range is now saved.
The NRR 2-40 is now again in operating

mode.

LEDs illuminated LEDs flash slowly

briefly

LEDs illuminated LEDs flash slowly

briefly

twice briefly

15

Commissioning – continued –

Switchpoints and proportional band

Switchpoint 1
Switchpoint 2
Switchpoint 3
Switchpoint 4
Selected control range

You can establish two switchpoints and a proportional band Xp within the control
range.

X

P

NRG 26-40

Fig. 9

16

80 %
70%

50 %

20 %

20%

90 %

45%
35 %

10 %

Fig. 10 (example) Fig. 11 (example)

10%

Commissioning – continued –

Establishing switchpoints and proportional band

Press button briefly.
Raise or lower the liquid level in the

vessel until the desired value is reached.
Use button if you first want to

establish the proportional band or a
different switchpoint.

LED illuminated LEDs flash slowly

briefly

Press button briefly.
Lower the liquid level until switchpoint 4

within the desired control range is reached.

Note:

In the event of a system malfunction,
the LED(s) “Bus status” and/or “Power”
will be flashing rapidly when in program
mode.

Press button briefly.
Switchpoint 4 is now saved.

Press button briefly.
The lower limit of the proportional band

X

is now selected (switchpoint 3).

p

LED flashes LEDs flash slowly

briefly

LED illuminated LEDs flash slowly

briefly

LED illuminated LEDs flash slowly

briefly

Press button slowly.
Raise the liquid level until switchpoint 3

within the desired control range is reached.

Example:

Liquid level switchpoint 3 = 40% and
liquid level switchpoint 2 = 60% make a
proportional band X
The setpoint is at approx. 50%.

(60% – 40 %) = 20 %

p

LED flashes LEDs flash slowly

briefly

17

Commissioning – continued –

Establishing switchpoints and proportional band – continued –

Press button briefly.
Switchpoint 3 is now saved.

LED illuminated LEDs flash slowly

briefly

Press button briefly.
The upper limit of the proportional band

X

is now selected (switchpoint 2).

p

Press button briefly.
Raise liquid level until switchpoint 2

within the desired control range is
reached.

Example:

Liquid level switchpoint 3 = 40% and
liquid level switchpoint 2 = 60% make a

proportional band X

of 20%.

p

Press button briefly.
Switchpoint 2 is now saved.

LED illuminated LEDs flash slowly

briefly

LED flashes LED flash slowly

briefly

LED illuminated LEDs flash slowly

briefly

Press button briefly.
Switchpoint 1 is now selected.

18

LED illuminated LEDs flash slowly

briefly

Commissioning – continued –

Establishing switchpoints and proportional band – continued –

Press button briefly.
Raise liquid level until switchpoint 1

within the desired control range is
reached.

LED flashes LEDs flash slowly

briefly

Press button twice briefly.
Switchpoint 1 is now saved.
The NRR 2-40 is now again in operating

mode.

LED illuminated

twice briefly

19

Commissioning – continued –

Calibrating the feedback potentiometer of an external control valve

The feedback potentiometer of an external control valve with electric actuator has to
be manually calibrated before commissioning.

1. Ascertain the total resistance of the feedback potentiometer.

2. Set the control valve manually into mid-position.

3. Adjust manually the position of the feedback potentiometer until the partial
resistance values of the measured total resistance are equal.

Fig. 12

Attention

20

■ The GESTRA level controller type NRR 2-40 requires a 1000

feedback potentiometer.

■ The NRR 2-40 works as two-position controller when the terminals for

the feedback potentiometer are not wired or the feedback potentiometer
is defective.

■ Use the control and display unit URB 1 for semi-automatic calibration of

the feedback potentiometer of an external control valve without
measurement of the resistance value. For more details see the
installation instructions of the URB 1.

ΩΩ

Ω

ΩΩ

Operation

Normal operation

Normal operation, controller is working.
The green LEDs 2 and 3 flash when the
external control valve is opened or
closed.
All LEDs go out when the setpoint is
reached.
The LED “Power” is illuminated.

Alarm

There are two types of alarm:

■ High-level alarm

■ Low-level alarm

High-level alarm

LED 1 changes after the de-energizing
delay from rapid flashing to lighting.

Low-level alarm

LEDs flash when the control valve is motored

LED “Power” illuminated

illuminatedflashes

LED 4 changes after the de-energizing
delay from rapid flashing to lighting.

flashes illuminated

21

Operation – continued –

Relay test high/low-level alarm

Press button briefly.
The test mode is active for 5 seconds.

LEDs illuminated

briefly

Hold down button .

Indicator LED 4 goes out

LED 4 goes out.
A low-level alarm is simulated for

switchpoint 4.

Hold down button .

Indicator LED 1 goes out

LED 1 goes out.
A high-level alarm is simulated for

switchpoint 1.

System Malfunctions

There are four types of system malfunctions that might occur in the level electrode
and the level controller:

■ Max. admissible temperature in electrode terminal box exceeded

■ No or faulty communication between controller and electrode

■ Malfunction in CAN bus

■ Failure of 24 V power supply unit built in level controller NRR 2-40

22

Attention

The terminal strip of the NRR 2-40 is live during operation.
This presents the danger of electric shock.
Cut off power supply before mounting or removing the equipment.

System Malfunctions – continued –

Systematic Malfunction Analysis

The sources of malfunctions occurring in CAN bus systems operating with several
bus-based stations must be analysed systematically since faulty components or
incorrect settings can give rise to negative interactions with intact bus devices in
the CAN bus system. These unwanted interactions can cause error messages in
fully functional bus devices, which will make fault detection even more difficult.

We recommend the following systematic fault finding procedure:

Step 1 (Start)

Detach terminal strips
in all sensing units of
bus nodes.

Level electrode
Conductivity electrode
Pressure sensor
Temperature sensor

Check

Use fault-finding
list to correct
fault(s).

Final test:
have all faults
been eliminated?

System
Malfunction

Use fault-finding list
to identify the
fault(s).

Cut off power supply
to the equipment.

Step 2

Plug in terminal strips
of the bus nodes
e. g.

NRS ...

and

NRG ...

(sensing unit)

Step 3

Apply mains voltage
to bus nodes,
e. g.

NRS ...

and

NRG ...

Check next system

System O.K.

Detach terminal
strips between
bus nodes
e. g.

NRS ...

and

NRG ...

23

System Malfunctions – continued –

System malfunction 1

The four indicator LEDs flash slowly.
High/low-level alarm

LEDs flash slowly

Fault:
Remedy:

The max. admissible temperature in the electrode terminal box is exceeded.
Insulate electrode flange to protect the equipment against heat radiation.

As soon as the temperature drops below the max. admissible limit the equipment
automatically returns to normal operation.

System malfunction 2

LEDs flash rapidly

The four indicator LEDs flash rapidly.
High/low-level alarm

Fault:
Remedy:

Fault:
Remedy:

The CAN bus line between the bus-based devices is interrupted.
Check wiring and terminals. Restart system.

Incorrect node ID(s).
Set correct nodes ID(s), referring to section “Annex - assigning and
changing the node IDs”. Disconnect the system from its power supply.
After 5 sec. apply power and restart system.

24

System Malfunctions – continued –

System malfunction 3

LED “Bus status” flashes slowly.

Fault

: Malfunction in CAN bus.

Remedy:

LED “Bus status” flashes slowly.
High/low-level alarm

Restart system.

LED flashes slowly

LED flashes slowly

Fault:
Remedy:

Fault:
Remedy:

Fault

Remedy:

Data transfer in CAN bus interrupted.
The bus cables have to be correctly connected according to the wiring
diagram (observe polarity!). Make sure that all end-of-line devices are
provided with 120 Ω terminating resistors, see wiring diagram.

Disconnect the system from its power supply. After 5 sec. apply power
and restart system.

The baud rate of one or more bus-based devices is not set correctly.
Check baud rate settings of all bus devices. The baud rates must be
identical. Refer to section “Annex” for more details.

Disconnect the system from its power supply. After 5 sec. apply power
and restart system.

The overall length of the bus cable does not correspond to the selected
baud rate.
Change baud rate settings of all bus-based devices according to the
indications specified in “Annex”.

Disconnect the system from its power supply. After 5 sec. apply power
and restart system.

25

System Malfunctions – continued –

System malfunction 4

LED “Power” flashes slowly.

LED flashes slowly

Fault:

Remedy:

Fault:
Remedy:

The power supply unit (PSU) is overloaded and may be misused for other
components.
Check load of power supply unit. Be sure to use the PSU only for the
voltage supply of bus-based network components.

Disconnect the system from its power supply. After 5 sec. apply power
and restart system.

Power supply unit defective.
Replace PSU.

Operation Malfunctions

Attention

The terminal strip of the NRR 2-40 is live during operation.
This presents the danger of electric shock.
Cut off power supply before mounting or removing the equipment.

Fault-finding list for troubleshooting

Device does not work – no function

Fault:
Remedy:

LED “Power” does not light up.
Apply power. Connect the equipment properly, referring to wiring
diagrams.

26

Operation Malfunctions – continued –

Fault-finding list for troubleshooting – continued –
Device does not work – interference signal

Fault:

Remedy:

Device fails to function properly

In spite of correct wiring and commissioning of the equipment an
interference signal is indicated.
The interference signal is caused by high-frequency interferences coming
from the installation. For interference suppression we supply ferrite rings,
stock code # 147253. The 230 V supply lines should be looped five to ten
times through the ferrite ring. If several controllers are used in one
system, they can be fed from the interference suppressed supply lines.
For the interference suppression of the bus line we supply hinged-shell
ferrite rings, stock code # 147254. The hinged-shell ferrite rings are
clamped onto the bus line close to the terminal strip of the controller.

Fault:

Remedy:

Fault:
Remedy:

Fault
Remedy:

Fault:
Remedy:

Fault:
Remedy:

The device works as two-position controller

Fault:
Remedy:

Incorrect function at analogue output. The following actual value indicator
shows incorrect values.
Correct the switchpoint settings and the control range settings of the
electrode.

Switchpoints and actual value indication drift continuously towards 100%.
Deposits have accumulated on the electrode rod. Remove the level
electrode and clean the electrode rod.

A high-level alarm is raised although the liquid level is below high level.
Deposits have accumulated on the electrode rod. Clean the electrode rod.
Defective electrode insulation. Replace level electrode.

Liquid level below switchpoint “low level”, device fails to switch.
Check installation of level electrode and vent hole in the protection tube.
If an external measuring pot is used make sure to open the isolating
valves.

“High-level” switchpoint exceeded – no indication.
Level switch defective. Replace the equipment.

Feedback potentiometer defective or not connected.
Connect equipment according to wiring diagram. Check feedback
potentiometer.

If faults occur that are not listed above or cannot be corrected, please contact our
service center or authorized agency in your country.

27

Annex

Warning

Ther terminal strip of the NRR 2-40 is live during operation. This presents
the danger of electric shock.

Cut off power supply before fixing or removing the housing lid or the
terminal strips.

Factory set default node IDs

Controller Level electrode

The node IDs of the individual units have to be adjusted manually.
For more information refer to the corresponding installations manuals.

Assigning/ changing node ID

If several systems of the same kind are to communicate in one CAN bus network, be
sure to assign one node ID for each individual system component (e. g. controller).

Detach terminal strip in order to set code switch .

Attention

■ Do not assign the same node ID twice within the CAN bus network.

A

8

Fig. 13

28

Annex – continued –

Node ID

OFF

S1

OFFS2
OFFS3

ON

S4

OFFS5

ON

S6

OFFS7

Fig. 14 (Factory setting)

S8

OFF

S9 S0

ON

ONON

16
32
64

OFF

ON

ON

OFF 1000 m

ON
ONON

Fig. 16 (Factory setting 250 kBit/s)

ON
ON
ON

40

1
2

S1

S2
4
8

S4

S7

Fig. 15 (Example)

Baud rate

Cable length

250 kBit/s

125 kBit/s
100 kBit/sOFFOFF 335 m

50 kBit/sOFF
20 kBit/s
10 kBit/s

ON
ON

OFFS3

ON

OFFS5
OFFS6

ON

125 mOFF

250 m

500 m

1000 m

Node ID

1
2
4

8
16
32
64

75

29

Annex – continued –

Warning

The terminal strip of the NRR 2-40 is live during operation.
This presents the danger of electric shock.

Cut off power supply before fixing or removing the housing lid or terminal
strips.

Neutral band

To guarantee a smooth controlled system you can establish a neutral band for the
setpoint W. The setpoint is defined by the proportional band which is determined by
switch point 2 and 3.

Detach terminal strip in order to set code switch .

A

Fig. 17 (Factory setting of neutral band)

Establishing/ changing neutral band

Note down current node ID and baud rate.

■ Node ID in this example “40”

■ Baud rate in this example

“

250 kBit/s”

8

Switch off mains voltage.
The four status LEDs go out.

The LED “Power” goes out.

30

LED “Power” extinguished

Annex – continued –

Adjust neutral band according to fig. 18.

■ Neutral band in this example “2 %”

Apply mains voltage.
The four status LEDs flash rapidly. If the

LED “Power” is alight, the adjustment
was successful.

If the LED (“Bus status”) above the LED
“Power” is alight, repeat the adjustment
procedure.

Switch off mains voltage.
The four status LEDs go out.

The LED “Power” goes out.

Adjust current node ID and baud rate.

■ Node ID in this example “40”

■ Baud rate in this example

“

250 kBit/s”

Apply mains voltage.
The four status LEDs flash rapidly.

The LED “Power” is illuminated.
The system is ready for operation.

Status LEDs flash rapidly

LED “Power” illuminated

LED “Power” extinguished

Status LEDs flash rapidly

LED “Power” illuminated

31

Annex – continued –

S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 N-Zone

OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF 0 %

OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF

Fig. 18

ON

OFF OFF 1 %

ON

OFF 2 %

ON ON

OFF 3 %

ON

ON

OFF

ON

ON ON

ON ON ON

5 %

7 %
10 %
15 %

32

For your notes

33

Annex – continued –

Declaration of conformity

We hereby declare that the equipment NRR 2-40 conforms to the following European
guidelines:

■ LV guideline 73/23/eec version 93/68/eec

■ EMC guideline 89/336/eec version 93/68/eec

which are based on the following harmonised standards:

■ LV standard DIN EN 50178

■ EMC standard DIN EN 50 081-2, DIN EN 61 000-6-2

This declaration is no longer valid if modifications are made to the equipment without
consultation with us.

Bremen, 23rd July 2002

GESTRA GmbH

Head of the Design Dept.

Uwe Bledschun

(Academically qualified engineer)

Key

Terminal strips

Supporting rail 35 x 15 to DIN EN 50022

Quality Assurance Manager

Lars Bohl

(Academically qualified engineer)

34

Example of Installation

Fig. 19

100

73

MAX 55 °C

118

MAX 95%

Fig. 20

20 20

35

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