GESTRA NRS 2-40 User manual

1
EN
English
Original Installation Instructions
810371-05
Level Switch Type
NRS 2-40

2
Contents
Usage for the intended purpose ..............................................................................................................5
Safety note .............................................................................................................................................5
Danger ...................................................................................................................................................5
Attention.................................................................................................................................................5
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility) .......................................................5
ATEX (Atmosphère Explosible).................................................................................................................5
Important Notes
Page
Explanatory Notes
Scope of supply......................................................................................................................................6
Description .............................................................................................................................................6
Function .................................................................................................................................................6
System components ...............................................................................................................................6
Design....................................................................................................................................................6
NRS 240..............................................................................................................................................11
Tools.....................................................................................................................................................11
Example of installation..........................................................................................................................12
Key.......................................................................................................................................................11
Installation
NRS 240................................................................................................................................................7
Corrosion resistance...............................................................................................................................8
Name plate / marking .............................................................................................................................8
Dimensions.............................................................................................................................................8
Technical Data
NRS 240................................................................................................................................................9
Key.......................................................................................................................................................11
Design
NRS 240..............................................................................................................................................10
Key.......................................................................................................................................................11
Functional Elements

3
Electrical Connection
Control cable ........................................................................................................................................13
Note .....................................................................................................................................................14
CAN bus voltage supply ........................................................................................................................14
Attention...............................................................................................................................................14
Wiring diagram.............................................................................................................................15 – 17
Key.......................................................................................................................................................18
CAN bus wiring diagram .......................................................................................................................18
Attention...............................................................................................................................................19
Note .....................................................................................................................................................19
Tools.....................................................................................................................................................19
Using the operating & display unit URB... ..............................................................................................24
NRS 240..............................................................................................................................................24
Measuring range...................................................................................................................................24
Establishing measuring range.......................................................................................................24 – 25
Switchpoints and proportional band......................................................................................................26
Establishing switchpoints..............................................................................................................27 – 29
Contents – continued –
Commissioning
Page
NRS 240..............................................................................................................................................30
Operation
CAN bus ...............................................................................................................................................20
Node ID ................................................................................................................................................21
Factory setting......................................................................................................................................22
Assigning / changing node ID................................................................................................................23
Attention...............................................................................................................................................23
Code switch settings.............................................................................................................................23
Basic Settings

4
Danger .................................................................................................................................................33
NRS 240..............................................................................................................................................33
Danger .................................................................................................................................................34
Systematic malfunction analysis...........................................................................................................34
System malfunction 1...........................................................................................................................35
System malfunction 2...........................................................................................................................35
System malfunction 3...........................................................................................................................36
System malfunction 4...........................................................................................................................37
System Malfunctions
Danger .................................................................................................................................................38
Disposal................................................................................................................................................38
Decommissioning
Contents – continued –
Page
Faultfinding list for troubleshooting......................................................................................................32
Malfunctions
NRS 240..............................................................................................................................................31
Highlevel (MAX) alarm .........................................................................................................................31
Lowlevel (MIN) alarm...........................................................................................................................31
Alarm
NRS 240..............................................................................................................................................30
Test
Note regarding Declaration of Conformity / Declaration of Manufacturer................................................38
Annex

5
Important Notes
Danger
The terminal strip of the NRS 240 is live during operation. This presents the danger
of electric shock!
Cut off power supply before mounting or removing the terminal strips and the housing
cover.
Usage for the intended purpose
Use level switch NRS 240 in conjunction with level electrode NRG 2640 only for monitoring and
regulating the level of conductive liquids.
Safety note
The equipment must only be installed and commissioned by qualified and adequately trained personnel.
Maintenance and retrofitting must only be performed by entrusted personnel who – through adequate
training – have achieved a recognised level of competence.
ATEX (Atmosphère Explosible)
According to the European Directive ATEX 2014/34/EU the equipment must not be used in potentially
explosive atmospheres.
Attention
The name plate specifies the technical features of the equipment.
Note that any piece of equipment without its specific name plate must neither be
commissioned nor operated.
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)
The equipment meets the requirements of the Low Voltage Directive 2014/35/EU and the
EMC Directive 2014/30/EU.

6
System components
NRG 26-40
Level electrode NRG 2640, PN 40
Design
NRS 2-40
Enclosure made from insulating material with box terminals for installation in control cabinets.
The terminals are externally accessible.
Mounting on a standardised supporting rail TS 35 x 15 DIN EN 50022.
External dimensions: 73 x 100 x 118
Scope of supply
NRS 2-40
1 Level switch type NRS 240 (plugin unit in plastic case with box terminals)
1 Terminating resistor 120 Ω
1 Installation & Operating manual
Description
Use level switch type NRS 240 in combination with level electrode type NRG 2640 for level
monitoring. The level switch has the following functions:
nFour liquid levels with one switchpoint each.
nHighlevel alarm, lowlevel alarm, pump ON, pump OFF, with one switchpoint each.
nContinuous level monitoring within control band defined by two preset limits.
nActualvalue output 420 mA
nContact multiplication by connecting in parallel a second level switch NRS 240 without actual
value output.
The level data are transmitted via CANbus from the electrode NRG 2640 to the level controller or
further system components.
Explanatory Notes
Function
At regular intervals the level electrode type NRG 2640 sends a data telegram to the level switch
NRS 240. The data transfer is effected by means of a CAN bus according to DIN ISO 11898. The
transferred measuring data are then evaluated and assigned to the manually adjusted switchpoints.
To guarantee the correct functioning and safety of the system the data transmitting cycle is constantly
monitored by the level switch. When the CAN bus line is interrupted the level switch sends a visual
signal to indicate a malfunction and the relays 1 and 4 will be instantaneously deenergized (alarm
position).
Additional functions, e.g. (de)energizing delay times of the output relays (1 to 25 sec.) can be adjusted
with the control terminal and display unit URB 1 / URB 2.

7
NRS 2-40
Technical data
Type approval no.
NRS 240: TÜV .XX399
Input / Output
Interface for CAN bus to DIN ISO 11898 using CANopen
Output – voltage supply for electrodes
Power supply 24 V DC, shortcircuit protected
Analogue output 4 – 20 mA, load 500 Ω for display of actual value.
4 voltfree relay contacts.
Max. contact rating with switching voltages of 24 V AC,
115 V AC and 230 V AC: 4 A resistive, 0.75 A inductive at cos ϕ0.5
Max. contact rating with a switching voltage of 24 V DC: 4 A.
Contact material: silver, hardgold plated
Interference suppression
Provide contactor with an external RC combination (100 Ω / 47nF)
Relay de-energizing delay
Output “MIN”, “MAX” 3 s
Indicators and adjustors
1 red LED for switchpoint “High level” (MAX)
1 red LED for switchpoint “Low level” (MIN)
2 green LEDs for switchpoints “PUMP ON” and “PUM OFF”
1 green LED “Power”
1 red LED “Bus fault”
1 tenpole code switch for node ID and baud rate settings
4 pushbuttons
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
Enclosure material
Front panel: polycarbonate, grey
Case: polycarbonate, black
Weight
Approx. 0.8 kg

8
1
2
3
4
Test
P
123E
4
GESTRA
NRS 2-40
MAX
MIN
2716
12345678
17 18 19 20 21 22 23 24
9
25
10
26
11 12
28
13
29
14
30
15
Corrosion resistance
If the equipment is used for its intended purpose, its safety is not impaired by corrosion.
Technical data – continued –
Name plate / marking
Fig. 1
Dimensions
Fig. 2
118
100
73
Steuergerät
control device
appareille de commande
Tamb = 55 °C ( 131 °F)
IN / OUT: CAN-Bus
18-36 V DC
IP 40 (IP20)
230V -15/+10%5VA
Betriebsanleitung
beachten
See installation
instructions
Voir instructions de
montage
Node ID:___ ___ ___
Münchener Str. 77
D-28215 Bremen
TÜV . WR . -399
NRS 2-40
12345
S
24V
DC CAN-BUS
-CH CL+
1716
LN
S
1.
NRG 26-40 NRS 2-40 NRS 2-40
2.
1514
-
+
X ext
4-20 mA
13
S
Seriennummer

9
1
2
3
4
Test
P
123E
4
GESTRA
NRS 2-40
MAX
MIN
123456789101112131415
1
2716 17 18 19 20 21 22 23 24 25 26 28 29 30
1
ON 234567890
Design
0
Fig. 3
9
NRS 2-40
9
a

10
1
2
3
4
Te st
P
123E
4
GESTRA
NRS2-40
MAX
MIN
Functional Elements
NRS 2-40
Fig. 5
Fig. 4
1
7 6 5 4 3 2
2716 17 18 19 20 21 22 23 24 25 26 28 29 30
1
2
3
4
Te st
P
123E
4
GESTRA
NRS 2-40
MAX
MIN
1
ON 234567890
8

11
Design / Functional Elements / Installation
Key
1Indicator LEDs Discharge control Fill control Malfunction
LED 1 – switchpoint 1 Highlevel alarm Highlevel alarm Multifunction
LED 2 – switchpoint 2 Pump ON Pump OFF Multifunction
LED 3 – switchpoint 3 Pump OFF Pump ON Multifunction
LED 4 – switchpoint 4 Lowlevel alarm Lowlevel alarm Multifunction
2LED “Bus status”
3LED “Power”
4Enter button / test mode
5Decrease button
6Increase button
7Program button
8Code switch, 10 poles
9Terminal strip
0Screws for terminal strip
aEnclosure
bSupporting rail TS 35 x 15 to DIN EN 50022
Tools
nScrewdriver (5.5/100)
Installation
NRS 2-40
Installation on mounting rail
1. Clip control unit onto mounting rail 35 x 15 mm
(DIN EN 50022).
2. Align control unit, Fig. 7

12
2716
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17 18 19 20 21 22 23 24
9
25
10
26
11 12
28
13
29
14
30
15
1
2
3
4
Te st
P
123E
4
GESTRA
NRS 2-40
MAX
MIN
1
2
3
4
Te st
P
123E
4
GESTRA
NRS 2-40
MAX
MIN
2716
12345678
17 18 19 20 21 22 23 24
9
25
10
26
11 12
28
13
29
14
30
15
Installation – continued –
Fig. 6
Example of installation
b
9 0
0
Fig. 7
20 20
a

13
UNITRONIC®is a registered trademark of LAPP Kabelwerke GmbH, Stuttgart
Electrical Connection
Control cable
NRS, NRR, LRR, TRS, URB 1
Note that screened multicore twistedpair control cable is required for the BUS line, e.g. UNITRONIC®
BUS CAN 2 x 2 x ... mm2or RE2YCYVfl 2 x 2 x ... mm2.
Control cable assemblies (2 x 2 x 0.32 mm2with connector and coupler) of various lengths are
available as optional extra.
NRG, LRG, EF, URZ, TRV, URB 2
The equipment is fitted with a sensorconnector union (5 poles, Acoded). For the connection of the
BUS devices control cable assemblies (with connector and coupler) of various lengths are available as
optional extra.
Note that the recommended control cables are not UV resistant and, if installed outdoors (apart from
URB 2), must be protected by a UV resistant plastic jacket or a cable duct.
The baud rate (data transfer rate) dictates the cable length and conductor size of the cable between
the bus nodes. The total power consumption must also be taken into account when selecting the con
ductor size. The total power consumption is calculated from the number of bus nodes.
If the cable length between the steam boiler and the control cabinet exceeds 15 m, we recommend
that you fit a branching box that is resistant to electromagnetic interference (stock code no. 1501214)
and to use a control cable with a larger conductor size for the distance to the control cabinet.
S 8 S 9 S 10 Baud rate Cable length Number of pairs
and conductor size [mm2]
OFF ON OFF 250 kBit/s 125 m 2 x 2 x 0.32
Factory setting
ON ON OFF 125 kBit/s 250 m 2 x 2 x 0.5
OFF OFF ON 100 kBit/s 335 m 2 x 2 x 0.75
ON OFF ON 50 kBit/s 500 m on request, dependent on
bus configuration
OFF ON ON 20 kBit/s 1000 m
ON ON ON 10 kBit/s 1000 m
The baud rate is set via the code switch 9. Make sure that all bus nodes have the same settings.

14
Note
nThe max. baud rates and cable lengths indicated above are based on empirical values
obtained by GESTRA. In certain cases it may be necessary to reduce the baud rate in
order to ensure troublefree operation.
nThe design of the data cable has a strong influence on the eletromagnetic immunity
(EMC). Take special care when connecting the equipment.
nIf you do not use the control cable assemblies connect the connectors and jacks
for the control cables as indicated in the assignment diagram for sensor connector
unions.
CAN bus voltage supply
To ensure troublefree operation the CAN bus system must be supplied with sufficient voltage.
Please use the following table to check the voltage supply of your bus system.
Control units with
voltage supply
Qty. xPower rating per equipment = Sum
x6 W = W
Please enter data! Sum 1 = W
Measuring transducers,
transmitters, control units,
operating & display unit URB 1
Qty. xPower rating per equipment = Sum
x3 W = W
Operating & display unit URB 2 x5 W =W
Please enter data! Sum 2 = W
If sum 2 exceeds sum 1, the CAN bus voltage must be supplied by a separate, stabilised safety power
supply unit (e.g. SITOP smart 24 V, 2.5 A) with 24 V DC.
The power supply unit must be electrically isolated from dangerous contact voltages, meeting at least
the requirements on double or reinforced isolation acc. to DIN EN 50178 or DIN 610101 or
DIN EN 607301 or DIN EN 60950 (safe isolation).
The power supply unit must be provided with an overcurrent protective device in accordance with
EN 610101.
Attention
If a safety power supply unit (e.g. SITOP smart, 24 V, 2.5 A) is used for the voltage supply
of the CAN bus do not tap the supply voltage from the terminals 1 and 5 of the GESTRA
control devices.
SITOP smart is a registered trademark of Siemens AG, München
Electrical Connection – continued –

15
Wiring diagram
Electrical Connection – continued –
Fig. 8
2716
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17 18 19 20 21 22 23 24
9
25
10
26
11 12
28
13
29
14
30
15
1
2
3
4
Te st
P
123E
4
GESTRA
NRS 2-40
MAX
MIN
S
C
L
CH
24V DC
CAN-Bus
+
120 Ω
LN
MINMAX
d
e gf
l
l
kh

16
Fig. 9
Discharge control – Pump OFF at low level (MIN)
Wiring diagram – continued –
Electrical Connection – continued –
2716
12345678
17 18 19 20 21 22 23 24
9
25
10
26
11 12
28
13
29
14
30
15
1
2
3
4
Te st
P
123E
4
GESTRA
NRS 2-40
MAX
MIN
S
C
L
C
H
24V DC
CAN-Bus
+
120 Ω
K1
K1L
N
lh
k
l
Pump contactor

17
Wiring diagram – continued
Electrical Connection – continued –
2716
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17 18 19 20 21 22 23 24
9
25
10
26
11 12
28
13
29
14
30
15
1
2
3
4
Te st
P
123E
4
GESTRA
NRS 2-40
MAX
MIN
S
C
L
C
H
24V DC
CAN-Bus
+
120 Ω
K1
K1
L
N
lh
k
l
Fig. 10
Fill control – Pump OFF at high level (MAX)
Pump contactor

18
d Mains voltage
e MAX limit contact (MAX alarm)
f Pump control
Fill control: = Pump OFF
= Pump ON
Discharge control: = Pump ON
= Pump OFF
g MIN limit contact (MIN alarm)
h Actual value output 420 mA
k Terminating resistor 120 Ω, RES 1 or RES 2
l Twisted pair control cable for CAN bus line
m Valve actuator
n Feedback potentiometer 1000 Ω actuator
Key
Electrical Connection – continued –
CAN bus wiring diagram
Fig. 14 RES 2
CEP*)
NRS, NRR, LRR,
TRS, URB 1
URB 2 NRG, LRG,
EF, URZ TRV
RES 1
*) Central earthing point

19
Electrical Connection – continued –
Tools
nScrewdriver for slotted screws, size 2.5, completely insulated according to VDE 06801
Note
nConnect screen only to terminal 3, ensuring electrical continuity and connect equip
ment once to the central earthing point (CEP).
nThe loop resistance must be under 10 Ω.
nThe rated voltage is stated on the name plate.
nWhen switching off inductive loads, voltage spikes are produced that may impair the
operation of control and measuring systems. Connected contactors must therefore be
provided with RC combinations, e. g. 0.1 µF / 100 Ω.
nDespite correct wiring system failure and malfunction messages may occur because
of high frequency malfunctions caused by the system. For more information refer to
the section “Troubleshooting”.
Attention
nWire equipment in series. Startype wiring is not permitted.
nInterlink screens of control cables such that electrical continuity is ensured and
connect them once to the central earthing point (CEP). If equipotential currents may
occur, e.g. in outdoor installations, separate the screen from the central earthing point
(CEP).
nTo protect the switching contacts fuse circuit with 2.5 A (slow blow) or according to
TRD regulations (1.0 A for 72 hrs operation).
nIf 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. 12, Fig. 13
nThe CAN bus line must not be interrupted while operating with one or more system
components.
In the event of an interruption the safety circuit will be opened!
If the switching controller has to be replaced first remove the terminal strips 9, Fig. 3
Note: Make sure that all system components connected are not operating before
removing the CAN bus line from the terminal strip.

20
CAN bus
All level and conductivity controllers and associated electrodes are interconnected by means of a CAN
bus adopting 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 1and 123.
The equipment 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 and probe) acc. to the
table on page 21.
If the length of the CAN bus cable exceeds 125 m, use code switch 8(Fig. 18) to change the
switch positions.
Note: The baud rate must be identical for all items of euqipment!
For more information refer to the section “Basic Settings – Code switch settings”.
Basic Settings