GESTRA NRS 2-40 User manual

1
Installation Instructions 810371-02
Level Switch Type NRS 2-40
NRS 2-40 

2
Contents
Usage to the intended purpose .......................................................................................7
Safety note / Danger .......................................................................................................7
NRS 2-40 ......................................................................................................................14
Control range ................................................................................................................14
Establish control range............................................................................................15, 16
Establish switchpoints within adjusted control range ....................................................16
Establish switchpoints ........................................................................................... 16 – 19
Commissioning
Explanatory Notes
Scope of supply ..............................................................................................................8
System description .........................................................................................................8
Function ..........................................................................................................................8
Technical data .................................................................................................................9
Wiring
Wiring diagram ...................................................................................................... 3, 4, 11
Basic Adjustment
CAN bus ........................................................................................................................ 12
Node ID .........................................................................................................................12
First / second control equipment ..................................................................................12
Factory setting ..............................................................................................................13
Installation
NRS 2-40 ......................................................................................................................10
Example of installation .................................................................................................29
Important Notes
Page
Normal operation ..........................................................................................................19
Alarm .............................................................................................................................19
High-level alarm ............................................................................................................19
Low-level alarm .............................................................................................................19
Relay test high/low (MAX/MIN) level .................................................................................20
Operation
Systematic fault finding procedure ................................................................................21
Analysis of system malfunctions 1 – 4 ....................................................................22–24
System Malfunctions
Fault-finding list for troubleshooting ........................................................................25, 26
Operation Malfunctions
Factory set default node IDs .........................................................................................27
Assigning / changing node IDs ................................................................................27, 28
Declaration of conformity ..............................................................................................29
Annex

3
Seite
Wiring Diagram
Fig. 2
Fig. 1
Paired cable
Paired cable
*) CEP = central earthing point
Control terminal
URB 1 Controller . . . Level electrodes NRG 26-40
Terminating resistor
120 Ω
Power supply CAN data line
Terminating resistor
120 Ω
Electrodes
...
Level switch
NRS 2-40
CEP*)
Relay Relay Relay Relay
1234
MAX MIN
Fill/
discharge
control
optional output
for actual value
4-20 mA
Terminating resistor
120 ΩΩ
ΩΩ
Ω
Potentiometer

4
Wiring Diagram
Fig. 4
Fig. 3
Discharge control –
Pump OFF at low level (MIN)
Fill control – Pump OFF at high level (MAX)
Paired cable
Paired cable
optional output
for actual value
4-20 mA
Terminating resistor
120 ΩΩ
ΩΩ
Ω
Potentiometer
Pump contactor
Paired cable
Paired cable
optional output
for actual value
4-20 mA
Terminating resistor
120 ΩΩ
ΩΩ
Ω
Potentiometer
Pump contactor

5
Parts Drawing
Fig. 6
Fig. 5
1
2
3567
A B
A
4

6
Indicator LEDs
LED 1 – switchpoint 1
LED 2 – switchpoint 2
LED 3 – switchpoint 3
LED 4 – switchpoint 4
LED “Bus status”
LED “Power”
Enter button / test mode
Decrease button
Increase button
Program button
Code switch, 10 poles
Terminal strip
Screws for terminal strip
Key
1
3
4
6
5
7
8
A
2
B
Discharge control Fill control
High-level alarm High-level alarm
Pump ON Pump OFF
PUMP OFF Pump ON
Low-level alarm Low-level alarm

7
Important Notes
Safety notes
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.
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 fixing or removing the cover.
Usage for the intended purpose
Use level switch NRS 2-40 in conjunction with level electrode NRG 26-40 only for
liquid level monitoring and control.

8
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.
Explanatory Notes
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 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:
■Four liquid levels with one switchpoint each.
■High-level alarm, low-level alarm, pump ON, pump OFF, with one switchpoint each.
■Continuous level monitoring within control band defined by two preset limits.
■Actual-value output 4-20 mA (optional)
■Contact multiplication by connecting in parallel a second level switch NRS 2-40
without optional actual value output.
The level data are transmitted via CAN-bus from the electrode NRG 26-40 to the level
switch.

9
Technical data
Type approval no.
NRS 2-40: TÜV · WR · 98-399
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 Ωfor display of actual value (optional).
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

10
Wiring diagram
See wiring diagrams on pages 3 and 4.
Wiring
Installation
NRS 2-40
Tool
Installation on mounting rail
1. Clip level switch onto mounting rail 35 x 15 mm
(DIN EN 50022).
2. Align level switch, fig. 14, fig. 15
■Screwdriver (5.5/100)
Note that screened multi-core twisted-pair control cable is required, e. g.
UNITRONIC®BUS CAN 2 x 2 x ... 2or 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 measuring sensors dictates the conductor
size.
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 page 27 and 28 for more details.
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UNITRONIC ®is a registered trademark of LAPP Kabelwerke GmbH, Stuttgart

11
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 T 2.5 A or
according to TRD regulations (1.0 A for 72 hrs.).
■If two or more system components are connected in a CAN bus network,
the first and last equipment have to be provided with a terminating
resistor of 120 Ω. Fig. 2
■The CAN bus network must not be interrupted while operating.
Any interruption will result in HIGH/LOW level alarm!
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.
■Screwdriver for slotted screws, size 2.5, completely insulated according to
VDE 0680.
Tool
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 25
and 26.
A
Wiring – continued –

12
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 1and 123.
The NRS 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 27 and 28 for more details.
Node ID
Basic Adjustments
First and second control equipment
It is possible to operate the level switch NRS 2-40 together with a second level
switch NRS 2-40 when 8 instead of only 4 switchpoints are required.
The second level switch is termed “second control equipment” and must be
ordered separately.
The NRS 2-40 can also be operated together with the level controller NRR 2-40
as “second control equipment”.
The standard equipment NRS 2-40 is termed “first control equipment 1”.
Be sure to assign different node IDs for NRS 2-40 (first control equipment),
additional NRS 2-40 (second control equipment) and NRR 2-40 (controller)!
The name plate of the NRS 2-40 is marked “Control equipment 1” or
“Control equipment 2”.

13
Factory setting
Basic Adjustments – continued –
100 %
80%
60 %
40%
20%
Fig. 7
■Baud rate: 250 kb/s
■Control equipment: 1
■Node ID: 039
■Control equipment: 2
■Node ID: 040
■Switchpoint 1: 80 %
■Switchpoint 2: 60 %
■Switchpoint 3: 40 %
■Switchpoint 4: 20 %
The level switch features the following factory set default values:
■Relay with energizing delay switchpoint 1: 1s
■Relay with energizing delay switchpoint 2: 1s
■Relay with energizing delay switchpoint 3: 1s
■Relay with energizing delay switchpoint 4: 1s
■Relay with de-energizing delay switchpoint 1: 3s
■Relay with de-energizing delay switchpoint 2: 1s
■Relay with de-energizing delay switchpoint 3: 1s
■Relay with de-energizing delay switchpoint 4: 3s

14
Commissioning
NRS 2-40
Apply power to the unit.
The four indicator LEDs flash rapidly.
The LED “Power” lights up.
The system test cycle takes about 2 sec.
Indicator LEDs flash rapidly
LED “Power” illuminated
37
Desired control range [mm]
Max. control range
Lower control
range limit
26
NRG 26-40
Fig. 8
Control Range
Establish the control range
for your level monitoring
application.
1
2
2
1
1

15
Establish control range
Commissioning – continued –
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 – 24).
Press button for 3 sec.
Lower the liquid level in the vessel until the
lower limit of the control range is reached.
Use button if you want to establish the
upper limit of the desired control range first.
If two control devices are used only one
has to be adjusted.
Press button briefly.
Raise liquid level until the upper limit of
the desired control range is reached.
Press button briefly.
Press button briefly.
The lower limit of the control range is
now saved.
LEDs illuminated LEDs flash slowly
LED “Power”
3 sec.
briefly
LEDs flash LEDs flash slowly
LEDs illuminated LEDs flash slowly
briefly
LEDs illuminated LEDs flash slowly
briefly
LEDs flash LEDs flash slowly
briefly
1
1

16
Establish control range – continued –
Commissioning – continued –
Press button twice briefly.
The upper limit of the desired control
range is now saved.
The NRS 2-40 is back in operating
mode.
Switchpoint 1
Switchpoint 2
Switchpoint 3
Switchpoint 4
Adjusted control range
Fig. 9
Press button briefly.
Raise or lower the liquid level in the
vessel until the desired value is reached.
Use button if you want to establish a
different switchpoint first.
Establish switchpoints within the adjusted control range
Establish switchpoints
twice briefly
LED illuminated LEDs flash slowly
briefly
NRG 26-40
1
5
5
4
3
2
1
4
3
2

17
Establish control range – continued –
Commissioning – continued –
Press button briefly.
Lower or raise liquid level until
switchpoint 4 within the adjusted control
range is reached.
Note:
In the event of a system malfunction the
LED(s) “Bus status” and/or “Power” will
be flashing rapidly.
Press button briefly.
Switchpoint 4 is now saved.
Press button briefly.
Switchpoint 3 is now active.
Press button briefly.
Raise liquid level until switchpoint 3
within the adjusted control range is
reached.
Press button briefly.
Switchpoint 3 is now saved.
LED illuminated LEDs flash slowly
briefly
LED illuminated LEDs flash slowly
briefly
LED illuminated LEDs flash slowly
briefly
LED flashes LEDs flash slowly
briefly
LED illuminated LEDs flash slowly
briefly

18
Establish control range – continued –
Commissioning – continued –
Press button briefly.
Switchpoint 2 is now active.
Press button briefly.
Raise liquid level until switchpoint 2
within the adjusted control range is
reached.
Press button briefly.
Switchpoint 2 is saved.
Press button briefly.
Switchpoint 1 is now active.
Press button briefly.
Raise liquid level until switchpoint 1
within the adjusted control range is
reached.
LED illuminated LEDs flash slowly
briefly
LED illuminated LEDs flash slowly
briefly
LED illuminated LEDs flash slowly
briefly
LED illuminated LEDs flash slowly
briefly
LED illuminated LEDs flash slowly
briefly

19
Establish control range – continued –
Commissioning – continued –
Press button twice briefly.
Switchpoint 1 is saved.
The NRS 2-40 is again in operating
mode.
Normal operation
Operation
Normal operation – switching controller is
working.
All LEDs go out as soon as the setpoint is
reached.
The LED “Power” is illuminated.
Alarm
There are two alarm conditions:
■High-level alarm
■Low-level alarm
LED 1 changes after the de-energizing
delay from rapid flashing to lighting.
LED 4 changes after the de-energizing
delay from rapid flashing to lighting.
High-level alarm
Low-level alarm
illuminatedflashes
flashes illuminated
LED illuminated
twice briefly
LEDs go out upon reaching the setpoint
LED “Power” illuminated

20
Hold down button .
LED 4 goes out.
A low-level alarm is simulated for
switchpoint 4.
Press button briefly.
The test mode is active for 5 seconds.
Hold down button .
LED 1 goes out.
A high-level alarm is simulated for
switchpoint 1.
Relay test high/low level alarm (MIN/MAX)
Operation – continued –
System Malfunctions
There are four types of system malfunctions that might occur in the level electrode and
the level switch:
■Max. admissible temperature in electrode terminal box exceeded
■No or faulty communication between switching controller and electrode
■Fault in CAN bus
■Failure of 24 V power supply unit built in level controller NRS 2-40
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 equipment.
Danger
LEDs illuminated
briefly
LED 4 goes out
LED 1 goes out