Flowserve NRR 2-40 User Manual

NRR 2-40

Installation Instructions 810369-03

Level Controller Type NRR 2-40

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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

Wiring Diagram

NRR 2-40 as three-position stepping controller

Paired cable

Fig. 1

Fig. 2

Wiring Diagram

NRR 2-40 as continuous controller

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

Level controller NRR 2-40

Level electrode NRG16-42

Terminating resistor 120 Ω

Sensor ...

Parts Drawings

Fig. 5

234

Fig. 6

Key

Indicator LED

LED 1 – Switchpoint 1 LED 2 – Control valve closing

LED 3 – Control valve opening

LED 4 – Switchpoint 4

LED “Bus status”

LED “Power”

Enter button / Test mode

Decrease button

Increase button

6 7

Program button

Code selector switch, 10 poles

Terminal strip

Screws for terminal strip

High-level not allocated

not allocated

Low-level

MalfunctionAlarm

Multifunction Multifunction Multifunction

Multifunction

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.

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).

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

1 % to 100%

Valve position feedback

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

Switching range (dead band) X

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

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

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!

Tool

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

VDE 0680.

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