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.

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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

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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