Flowserve NRS 1-40 User Manual

NRS 1-40

Installation Instructions 810635-03

Level Switch Type NRS 1-40



1

Contents

Page

Important Notes

Usage for the intended purpose ......................................................................................6

Safety note ......................................................................................................................6

Danger ............................................................................................................................ 6

Explanatory Notes

Scope of supply ..............................................................................................................6

Description ......................................................................................................................6

Function .......................................................................................................................... 7

Technical data .................................................................................................................8

Installation

NRS 1-40......................................................................................................................... 9

Example of installation ..................................................................................................29

Wiring

Wiring diagram ......................................................................................................3, 9, 10

Basic Adjustment

CAN bus ........................................................................................................................11

Node ID .........................................................................................................................11

Factory setting............................................................................................................... 11

Commissioning

NRS 1-40....................................................................................................................... 12

Operation

NRS 1-40....................................................................................................................... 12

Test Cycle

NRS 1-40................................................................................................................. 12, 13

Alarm

Low-level alarm for water-level limiter ...........................................................................13

Low-level alarm for water-level limiting system .............................................................13

System Malfunctions

Fault analysis, system faults 1 – 7 ........................................................................14 – 22

Operation Malfunctions

Fault finding list for troubleshooting ............................................................................... 23

Emergency Operation

Emergency operation of water-level limiting system ..................................................... 24

Annex

Factory set default node IDs .................................................................................24 – 26

Assigning/changing node ID .........................................................................................25

Declaration of conformity .............................................................................................. 27

2

Wiring Diagram

Twisted pair cable

Twisted pair cable

Protection circuit

– uninterrupted –

Further safety
equipment

Note:

The NRS 1-40 is
the first equipment
of the safety chain.

All relay contacts are
internally linked.

Photo-Mos output
24 V- 230 V AC/DC, 100 mA
Instantaneous LW alarm,
clocked malfunction signal

Fig.1

Control terminal
URB 1

Terminating resistor
120 Ω

Fig. 2

Switching
controller
NRS 1-40

Voltage supply

Terminating resistor
120 Ω

Controller
...

Level electrode
NRG16-40

CAN data line

Terminating resistor
120 Ω

Level sensor
NRG...

3

Part Drawings

Fig. 3

1

3 2567

4

A

A

B

Fig. 4

4

Key

Indicator LED

1

LED 1: Electrode 1

LED 2: Electrode 2

LED “Bus status”

2

LED “Power”

3

Enter /Test mode

4

Decrease

5

Increase

6

Program key

7

Two-pole code switch

8

9

Ten-pole code switch

A

Terminal strip

Screws for terminal strip

B

Alarm Malfunction

Low-level alarm Multifunction

Low-level alarm Multifunction

5

Important Notes

Usage for the intended purpose

Use switching controller NRS 1-40 only in conjunction with GESTRA level electrode
NRG 16-40, NRG 17-40 or NRG 19-40 for signalling low-water level (min. alarm).

Safety Note

Installation must only be performed 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 safety device.

Danger

The terminal strip of the NRS 1-40 is live during operation.
This presents the danger of electric shock.
Cut off power supply before fixing or removing the housing cover.

Explanatory Notes

Scope of Supply

NRS 1-40

1 Switching controller NRS 1-40 (plug-in unit in plastic case with terminals)
1 Terminating resistor 120 Ω
1 Installation and service manual

Description

The controller type NRS 1-40 is a self-monitoring low-water level limiter with periodic
self-checking and monitoring feature of the output relay contacts, to be used in
conjunction with one level electrode type NRG 16-40, 17-40 or 19-40. The controller
has the following function:

6

Explanatory Notes – continued –

Description – continued –

■ Low-water level alarm with one level electrode

The equipment detects the min. water level (low-level limiter) and complies with the
German regulations for use in steam and hot-water plants operating without constant
supervision according to TRD 401, TRD 602 and TRD 604.

When used with two level electrodes type NRG 16-40, 17-40 or 19-40, the controller
NRS 1-40 constitutes a high-integrity low-water level limiter system with periodic self­checking. The controller features the following function:

■ Low-water level alarm with two level electrodes

This equipment combination detects the min. water level (low-level limiting system) and
complies with the German regulations for use in steam and hot-water plants operating
without constant supervision according to TRD 604, sheet 1 and 2 (24/72 hours
operation without constant supervision).

This item of electrical equipment complies with the Technical Regulations on Protection
Circuits to DIN VDE 0116 (prEN 50156).

The level data are transferred from the electrode NRG 1...-40 to the controller via CAN
bus using the CANopen protocol. Only one low-level limiting system may be used per
CAN-based network.

Function

At regular intervals the level electrode NRG 1...-40 sends a data telegram to the
controller NRS 1-40. The data transfer is effected by means of a CAN bus according to
ISO 11898. The transferred measuring data are constantly evaluated by the controller.
A periodic self-checking routine tests every 3 seconds the integrity of the system and its
safety functions, with a malfunction in the controller resulting in immediate boiler shut­down. When the CAN bus line and, consequently, the data transmitting cycle are
interrupted, the controller sends a visual signal to indicate a faulty condition and the
relays are instantaneously de-energized (fail-safe position).

The controller also facilitates user-friendly performance tests and detection/
evaluation of malfunctions. To guarantee the correct and safe functioning of the low­level limiter a min. electrical conductivity of 0.5 µS/cm at 25 °C is required.

The relay de-energizing delay is normally set to 3 seconds at the factory but delays of
15 to 25 seconds are available on request.

Apart from the burner protection circuit there is also a separate Photo-MOS make
contact output for remote indication.

The automatic self-testing routine of the switching controllers checks every 3 sec. their
safety functions. The corresponding functions of the level electrodes will be tested by
the electrode's self-checking routine every 10 sec.

The malfunction information is updated with every self-test. If no faults have ocurred the
malfunction information will be deleted automatically. If faults persist the malfunction
information remains stored.

As part of the automatic self-testing routine of the switching controller, the switching-off
of the output relays every 6 hrs is checked, too. If a fault is detected the information on
this malfunction will be saved accordingly.

7

Explanatory Notes – continued –

Technical Data

Type approval no.

TÜV · WB · 99-403
EG BAF-MUC 0202 103881 002

Input

Interface for CAN bus to DIN ISO 11898 CANopen protocol

Output voltage supply for electrodes

18 – 36 V, short-circuit protected

Output for protection circuit

Two volt-free relay contacts, locally connected in series.
Max. contact rating for switching voltages 24 V AC/DC, 115 V AC and 230 V AC:
4 A resistive/inductive. Contact material: silver, hard-gold plated

Interference suppression

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

Signal output

Photo-MOS output, instantaneous with low level, timed malfunction signal, max. contact
rating for switching voltages 24 V AC, 115 V AC and 230 V AC/DC: 100 mA resistive

Relay de-energizing delay

Output “Low-level alarm”, set to 3 sec. (standard), optional for e. g. marine applications
15 sec. or 25 sec., internally linked for relay contact test

Indicators and adjustors

4 pushbuttons “Parameterisation/TEST”
1 red LED “Low-level alarm electrode 1”
1 red LED “Low-level alarm electrode 2”
2 red LEDs “Multifunction”
1 red LED “Bus status”
1 green LED “Power”
1 ten-pole code switch: 7 poles for setting node ID, 3 poles for setting baud rate
1 two-pole code switch for limiter/limiting system

Internal self-checking routine

Every 3 seconds

Periodic testing of output relay contacts

Every 6 hours

Supply voltage

230 V +/–10%, 50/60 Hz
115 V +/–10%, 50/60 Hz (optional)

Power consumption

10 VA

Sensitivity

≥ 0.5 µS/cm at 25 °C

Protection

Enclosure: IP 40 to DIN EN 60529
Terminal strip: IP 20 to DIN EN 60529

Admissible ambient temperature

0°C to 55°C

Enclosure material

Front panel: polycarbonate, grey. Enclosure: polycarbonate, black

Weight

Approx. 0.8 kg

8

Installation

NRS 1-40

Installation on mounting rail

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

2. Align switching controller, see Fig. 11, Fig. 12

Note

■

If an external measuring pot is used, each level electrode type
NRG 16-40 requires one switching controller NRS 1-40 and one
GESTRA monitoring unit SRL 6.

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 power consumption of the sensors dictates the conductor size.

®

8S9S01SetarduaBhtgnelelbaC

FFO NO FFO s/tiBk052 m521

gnittesyrotcaF

NONOFFOs/tiBk521m0525.0x2x2

FFOFFONOs/tiBk001m53357.0x2x2

NOFFONOs/tiBk05m005

FFONONOs/tiBk02m0001

NONONOs/tiBk01m0001

sriapforebmuN

2

]

mm[ezisrotcudnocdna

43.0x2x2

notnedneped,tseuqerno

noitarugifnocsub

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 more than 125 m (up to 1000 m) is desired, make
sure to modify the baud rate accordingly. Refer to pages 25 and 26 for more
details.

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

9

Wiring – continued –

Wiring Diagram

Wiring diagram see page 3.

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 (1.0 A for 72 hrs operation).

■

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

Fig. 2

■

Use only one water-level limiting system per CAN bus network.

■

The CAN bus line must not be interrupted while operating with one or
more system components.

An interruption will result in disconnection caused by a
malfunction.

If the switching controller has to be replaced be sure to remove first the
terminal strips , Fig. 4

Note: Make sure that all system components connected are

operating

before removing the CAN bus line from the terminal strip.

A

not

10

Note

■

Connect screen only to terminal 3, ensuring electrical continuity and
connect equipment once to the central earthing point (CEP).

■

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, e. g. 0.1 µF/ 100 Ω.

■

Despite 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 page 23.

■

In the event of a shut-down due to a malfunction the signal output
(terminals 7 and 8) is cyclically opened and closed in order to ensure an
optical distinction between “Low-level alarm” (signal output closed) and
“Malfunction shut down”.

If necessary connect terminals 7 and 8 externally to an indicator lamp,

Fig. 1.

Wiring – continued –

Tools

■

Screwdriver for slotted screws, size 2.5, completely insulated according to
VDE 0680

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 NRS 1-40 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
(e. g. controller). Refer to pages 24 and 25 for more details.

Node ID

Note

■

The node ID 3* for the second level electrode NRG 16-40 must be
adjusted on site since the equipment features the factory set default
value 2 when delivered.

Factory setting

The switching controller features the following factory set default values:

■ Baud rate: 250 kb/s

■ Sensitivity: 0.5 µS/cm

■ Node ID: 001

■ Configuration: Operation with two level electrodes NRG 1...-40

■ Relay de-energizing delay: 3 s

11

Commissioning

NRS 1-40

Apply power to the unit.
The four indicator LEDs flash rapidly.
The LED “Power” lights up.
The test cycle takes about 3 sec.

Note

■

To analyse and eliminate malfunctions that may occur during the com­missioning procedure refer to section “System Malfunctions” on
page 14.

Operation

NRS 1-40

Normal operation, electrode(s) submerged.
The four indicator LEDs are not illuminated.
The LED “Power” lights up.

Indicator LEDs flash rapidly

LED “Power” illuminated

Indicator LEDs extinguished

Test Cycle

NRS 1-40

Press button briefly.
The test mode is activated for about

10 sec. Be sure to press
button or within these 10 sec.

Note:

The safety circuit will be interrupted during
the test cycle.

12

LED “Power” illuminated

Test Cycle – continued –

NRS 1-40

Press button for 3 sec.
LED 1 flashes rapidly and remains

permanently illuminated after 3 sec.
A low-level alarm is simulated for

electrode 1.

Indicator LED 1 changes after 3 sec. from rapid
flashing to lighting

3 sec.

Press button briefly.
LED 2 flashes rapidly and remains

permanently illuminated after 3 s.
A low-level alarm is simulated for

electrode 2.
This test cycle is performed for the water-

level limiting

system (two level electrodes).

Alarm

There are four different alarm conditions:

■

Low-level alarm for
water-level limiter
(one level electrode).

■

Low-level alarm for
water-level limiting system
(two level electrodes).

Low-level alarm for water level limiter

LED 1 flashes rapidly.
LED 1 remains permanently illuminated after

the de-energizing delay.

Indicator LED 2 changes after 3 sec. from rapid
flashing to lighting

Low-level alarm for water level limiting system

LED 1 and 2 flash rapidly.
LED 1 and 2 remain permanently illuminated

after the de-energizing delay.

13

Alarm – continued –

Note

■

The switching controller does not have its own lock-out circuit.
Lock-out and manual reset facilities are to be provided externally.

■

The signal output (terminal 7, 8) is instantaneously energized
(no delay of response) in the event of an alarm.

System Malfunctions

Faulty installation and/or configuration of CAN bus components, excessive
temperatures in the devices, defective electronic component parts or electromagnetic
interferences of the supply system can result in system malfunctions.

There are four system malfunctions that might occur in the level electrode and the
switching controller.

■ Max. admissible temperature in electrode terminal box exceeded

■ No or faulty communication between controller and electrode

■ Fault in CAN bus

■ Failure of 24 V power supply unit built in switching controller NRS 1-40

The malfunction information is updated with every self-test (switching controller:
every 3 sec., level electrodes: every 10 sec.). If no faults have ocurred the malfunction
information will be deleted automatically. If faults persist the malfunction information
remains stored.

As part of the automatic self-testing routine of the switching controller, the switching­off of the output relays every 6 hrs is checked, too. If a fault is detected the signal
output (terminals 7 and 8) will be opened and closed as a function of time.

14

Danger

The terminal strip of the NRS 1-40 is live during operation.
This presents the danger of electric shock.
Cut off power supply before fixing 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:

15

System Malfunctions – continued –

Danger

The terminal strip of the NRS 1-40 is live during operation.
This presents the danger of electric shock.
Cut off power supply before fixing or removing the equipment.

System Malfunction 1

LED 1 flashes slowly.

LED 1 flashes slowly

A system malfunction in level
electrode 1 was detected.

Hold down button .

LED 1 and 2 flashes slowly

LED 1 and 2 flashes slowly

Fault

: The max. admissible temperature in the terminal box of the electrode

has been exceeded.

Remedy

Hold down button .

: Insulate electrode flange against heat radiation.

LED 2 flashes slowly

LED 2 flashes slowly.

Fault:
Remedy:

The electronic circuit board of the level electrode is defective.
Replace electronic circuit board of the level electrode 1.

The system will continue to work once
the causes of the system malfunctions
are completely eliminated.

16

System Malfunctions – continued –

System Malfunction 2

LED 2 flashes slowly.
A system malfunction in level

electrode 2 was detected.

Hold down button .
LED 1 and 2 flashes slowly.

Fault:

The max. admissible temperature in the terminal box of the electrode
has been exceeded.

Remedy:

Insulate electrode flange against thermal radiation.

Hold down button .
LED 2 flashes slowly.

LED 2 flashes slowly

LED 1 and 2 flashes slowly

LED 2 flashes slowly

Fault:
Remedy:

The electronic circuit board of the level electrode is defective.
Replace the electronic circuit board of the level electrode 2.

Press button twice for a few seconds
to acknowledge the malfunction
messages.

The system will continue to work once
the causes of the system malfunctions
are completely eliminated.

17

System Malfunctions – continued –

System Malfunction 3

LED 3 flashes slowly.
A communication malfunction in the

bus line has been detected.

Hold down button .
LED 1 flashes rapidly.
A bus communication malfunction

between level switch and level

electrode 1 has been detected.

Fault:
Remedy

The data transfer between level switch and electrode is interrupted.

: Make sure that the bus lines are wired in accordance with the wiring

diagram (observe polarity). All end-of-line devices must be provided
with a terminating resistor of 120 Ω! (see wiring diagram).

Cut off power supply and re-start the system after 5 sec.

Fault:
Remedy:

The baud rate of one or more bus devices is not set correctly.
Check baud rate settings of all bus devices. The baud rate settings
must be identical. Please refer to section “Annex”.

Cut off power supply and re-start the system after 5 sec.

LED 3 flashes slowly

LED 1 flashes rapidly

Fault:

Remedy:

Fault:

Remedy:

18

The overall length of the bus line does not correspond to the baud rate
setting.
Change baud rate settings of all bus based equipment as described under
“Annex”.

Cut off power supply and re-start the system after 5 sec.

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

System Malfunctions – continued –

System Malfunction 3 – continued –

Hold down button .
LED 2 flashes rapidly.
A bus communication malfunction

between level switch and level

electrode 2 has been detected.

Fault:
Remedy

Fault:
Remedy:

Fault:

Remedy:

Fault:

Remedy:

The data transfer between level switch and electrode is interrupted.

: Make sure that the bus lines are wired in accordance with the wiring

diagram (observe polarity). All end-of-line devices must be provided
with a terminating resistor of 120 Ω! (see wiring diagram).

Cut off power supply and re-start the system after 5 sec.

The baud rate of one or more bus devices is not set correctly.
Check baud rate settings of all bus devices. The baud rate settings
must be identical. Please refer to section “Annex”.

Cut off power supply and re-start the system after 5 sec.

The overall length of the bus line does not correspond to the baud rate
setting.
Change baud rate settings of all bus based equipment as described under
“Annex”.

Cut off power supply and re-start the system after 5 sec.

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

LED 2 flashes rapidly

19

System Malfunctions – continued –

System Malfunction 4

LED 4 flashes slowly.
A malfunction in the level switch has

been detected.

Fault:

The electronic circuit board of the level switch is defective (e. g. output
relay).

Remedy:

Fault:
Remedy:

Replace level switch. Restart system.

No voltage across terminal 25, self-checking routine unsuccessful.
Wire NRS 1-40 as first device in the safety chain.
Wire NRS 1-40 according to wiring diagram (ensure constant voltage
supply across terminal 25). Restart system.

Fault:
Remedy:

Voltage across terminal 26 and/or 30.
Do not connect these terminals.

System Malfunction 5

LEDs 1 to 4 flash rapidly.
A general communication

malfunction has been detected.

LED 4 flashes slowly

LEDs flash rapidly

Fault:
Remedy:

20

No communication between bus devices possible.
Check wiring, node ID, baud rate setting and bus cable.

Cut off power supply and re-start system after 5 sec.

System Malfunctions – continued –

System Malfunction 6

LED “Bus status” flashes slowly.

LED flashes slowly

Fault:
Remedy:

Fault:
Remedy:

Fault:

Remedy:

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

Cut off power supply and re-start system after 5 sec.

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

Cut off power supply and re-start system after 5 sec.

The overall length of the bus cable does not correspond to the selected
baud rate.
Change baud rate settings of all nodes according to page Annex.

Cut off power supply and re-start system after 5 sec.

21

System Malfunctions – continued –

System Malfunction 7

LED “Power” flashes slowly.

LED flashes slowly

Fault:

Remedy:

Fault:
Remedy:

The power supply unit (PSU) is overloaded. The power supply unit 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.

Cut off power supply and restart the system after 5 sec.

Power supply unit defective.
Replace power supply unit.

22

Operation Malfunctions

Danger

The terminal strip of the NRS 1-40 is live during operation.
This presents the danger of electric shock.
Cut off power supply before fixing or removing the equipment.

Fault finding list for troubleshooting

Equipment does not work – Malfunction message

Fault:

Remedy:

Water level below switchpoint LOW LEVEL – no function

Fault:
Remedy:

Water level not yet below switchpoint LOW LEVEL – Low level alarm is raised

Fault:
Remedy:

Fault:
Remedy:

In spite of correct wiring and commissioning of the equipment an
interference signal is indicated.
The interference signal is caused by H. F. interferences coming from the
installation. For interference suppression of the voltage supply we supply
ferrite rings, stock code 147253. The 230 V supply lines should be
looped through the ferrite ring five to ten times. If several controllers are
used in the 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.
Restart the system after installation.

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

diagram on page 3.

Low-level alarm is given despite the electrode being submerged.
The conductivity of the fluid to be monitored is < 0.5 µS/cm.

The electrode body does not have earth connection to the vessel.
Clean seating surfaces and insert metal joint ring
(of stainless steel 1.4301) D 27 x 32 to DIN 7603.

Do not insulate the level electrode with hemp or PTFE tape!

Fault:
Remedy:

Fault:

Remedy:

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

The vent hole in the protection tube does not exist, is obstructed or flooded.
Check protection tube and, if necessary, provide vent hole.

The isolating valves of the external measuring pot (optional item) are
closed.
Open isolating valves.

23

Emergency Operation

Emergency operation of water-level limiting system

If one level electrode fails to operate the installation can continue to operate in
emergency mode under constant supervision according to TRD 401 with one level
electrode.

1. Undo screws and remove the lower terminal strip , Fig. 4.

2. Set code selector switches “S1”and “S2” to “

3. Set code selector switches “S1” to “

B

8

9

ON” and “S2 - S7” to “OFF”. The switching

A

OFF”, Fig. 6, Fig. 8.

controller NRS 1-40 has now the node ID “1”, Fig. 7.

4. Set node ID of the working electrode to “2” (cf. section “Emergency operation”
in the Installation Manual for level electrodes NRG 16-40, 17-40, 19-40).

5. Affix lower terminal strip .

A

Attention

■ Enter beginning of emergency operation in the boiler log.

■ An installation operating in emergency mode has to be constantly

supervised.

■ Install a visible sign or signal in the control room to indicate emergency

operation.

■ Immediately replace faulty level electrode.

■ Enter end of emergency operation in the boiler log.

Annex

Danger

The terminal strip of the NRS 1-40 is live during operation.
This presents the danger of electric shock.
Cut off power supply before fixing or removing the equipment.

Factory set default node IDs

Switching

Level electrode

controller

The individual node IDs must be manually adjusted on the equipment.
Please observe the installation instructions of the device in question.

24

Annex – continued –

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 strips in order to change the code switch settings and .

Attention

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

A 8 9

98

Fig. 5

25

Annex – continued –

8 8

Electrode

ON

S1

ON

S2

Fig. 6 Fig. 8

ON

S1

OFFS2
OFFS3
OFFS4
OFFS5
OFFS6
OFFS7

Fig. 7 (Factory setting) Fig. 9 (Example)

S8

OFF

ON

OFF

ON

OFF 1000 m

ON

Fig. 10 (Factory setting: 250 kBits/s)

S9 S0

ON
ON

OFF
OFF

ON
ON

1+2

Node ID

1
2
4

8
16
32
64

OFF
OFF

ON
ON

ON
ON

1

Baud rate

250 kBit/s
125 kBit/s

100 kBit/s

50 kBit/s
20 kBit/s

50 kBit/s

S1

S1

S3
S4

Cable length

Electrode
OFF
OFFS2

Node ID
OFF
OFFS2

ON
ON

OFFS5
OFFS6
OFFS7

125 m
250 m

335 m
500 m

1000 m

1

99

12

1
2
4

8
16
32
64

26

Annex – continued –

Declaration of conformity

We hereby declare that the equipment NRS 1-40 conforms to the following
European guidelines:

■

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

■

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

■

Pressure Equipment Directive
PED 97/23/eec of 29

The equipment is a safety accessory as defined in section 1, paragraph 2.1.3,
Conformity assessment procedure applied according to Annex III, Module B and D.

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

Other technical rules and regulations applied: VdTÜV Bulletin “Water Level 100”
(4/1990 and draft 8/2001).

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

th

May 1997

Bremen, 27th March 2002

GESTRA GmbH

Head of the Electronics Design Dept.

Stefan Bode

(Academically qualified engineer)

Quality Assurance Manager

Lars Bohl

(Academically qualified engineer)

27

Key

Terminal strips

A

Supporting rail 35 x15 to DIN EN 50022

C

28

Example of Installation

A

A

Fig. 11

100

C

73

MAX 55 °C

118

MAX 95 %

Fig. 12

20 20

29

For your notes

30

For your notes

31

GESTRA Gesellschaften · GESTRA Companies · Sociétés GESTRA · Sociedades Gestra · Società GESTRA

Vertretungen weltweit · Agencies all over the world · Représentations dans le monde entier · Representaciones en todo el mundo · Agenzie in tutto il mondo

Great Britain
Flowserve Flow Control (UK) Ltd.

Burrel Road, Haywards Heath
West Sussex RH 16 1TL
Tel. [phone] / 31 44 00
Fax [phone] / 31 45 57
E-mail: [e-mail]

France
Flowserve Flow Control S.A. S.

10 Avenue du Centaure, BP 8263
F-95801 CERGY PONTOISE CEDEX
Tél. [phone]
Fax 00.33.1 / 344326 87
E-mail: [e-mail]

España
GESTRA ESPAÑOLA S.A.

Luis Cabrera, 86-88
E-28002 Madrid
Tel. [phone]
Fax [phone]
E-mail: [e-mail]

Italia

Flowserve S.p. A

Divisione Italgestra
Via Prealpi, 30 – 20032 Cormano (MI)
Tel. [phone]
Fax [phone]
E-mail: [e-mail]

Portugal

Flowserve Portuguesa, Lda.

Av. Dr. Antunes Guimarães, 1159
Porto 4100-082
Tel. [phone]
Fax [phone]
E-mail: [e-mail]

®

GESTRA GmbH

Postfach 10 54 60, D-28054 Bremen, Münchener Str. 77, D-28215 Bremen
Telefon [phone], Telefax [phone]
E-Mail [e-mail], Internet www.gestra.de

A Unit of Flowserve Corporation

810635-03/304cm · ©2001 GESTRA GmbH · Bremen · Printed in Germany

32