Flowserve NRS 2-4 User Manual

NRS 2-4

Installation Instructions 810427- 00

Level Switch Type NRS 2-4

A Siebe Group Product

1

Dimensions/Parts Drawings

NRS 2-4

MAX

NRS 2-4

MAX

128,5

Fig. 1

169

45.72 (9TE)

(TE = division units)
1 TE = 5.08 mm)

E
D

A

F

C
B

MAX 70°C

MAX 95%

Fig. 2

2

IP 10

Key

A

32 way Euro card connector

B
C
D
E
F

OPERATION

LED
LED MALFUNCTION WIRE
LED DEFECTIVE PROBE
LED HIGH LEVEL
Fixing screws

3

Contents

Page

Important notes

Safety Note .....................................................................................................................5

Warning ...........................................................................................................................5

Explanatory Notes

System description ......................................................................................................... 6

Function .......................................................................................................................... 6

Design ............................................................................................................................. 6

Technical Data ................................................................................................................7

Installation

Design “c”/“d” ..................................................................................................................8

Tools ................................................................................................................................ 8

Wiring

Design “c”/“d” ..................................................................................................................9

Wiring diagram ................................................................................................................9

Key to wiring diagram ...................................................................................................10

Attention...................................................................................................................... ..10

Commissioning

Warning.........................................................................................................................11

Important note .............................................................................................................. 11

Check wiring .................................................................................................................11

Apply mains voltage......................................................................................................11

Check switching function ..............................................................................................11

Check voltage ...............................................................................................................11

Table 1 Measuring voltages ..........................................................................................12

Annex

Warning.........................................................................................................................13

Fault finding list .............................................................................................................13

Declaration of conformity ..............................................................................................13

4

Important Notes

Safety Note

Use level switch NRS 2-4 in combination with GESTRA level probe type
NRG 211 only.

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 NRS 2- 4 is live during operation. This presents
the danger of electric shock.
Cut off power supply before inserting or removing the 19" slide-in unit
and before carrying out any installation or maintenance work.

5

Explanatory Notes

Scope of supply
NRS 2-4, design “c”

1 Level switch NRS 2-4
2 Guide rails
1 32 pole screw-type connector
1 Installation instructions

NRS 2-4, design “d”

1 Level switch NRS 2-4
1 Installation instructions

System description

The level switch NRS 2-4 is an analogue electronic amplifier for the capacitance
electrode type NRG 211.

In combination with this level electrode it can detect high water level. In addition, the
level switch evaluates possible malfunction signals coming from the electrode and
monitors the electrode supply cable and can therefore be used as part of a
controlled draining system in power stations.

Function

The measuring voltage delivered by the electrode is decoded as a function of its
magnitude and indicated by LEDs when there is a malfunction in the electrode
supply cable or in the electrode and when the electrode is exposed or submerged
(high level).

In the case of a malfunction the output relay malfunction is energized. When the
electrode is submerged (high level) the output relay alarm is energized.

Optocouplers are connected in parallel and assigned to the output relays. They will
be energized in the event of a malfunction or an alarm.

Design
Design “c”

19" slide-in unit with guide rails and 32 pole screw-type connector for installation in
19" magazines to DIN 41494 part 5.

Design “d”

Spare 19" slide-in unit

6

Technical Data
Supply voltage

24V DC

Power consumption

2VA

Output – Measuring circuit

12 V DC (supply voltage going to level electrode)
30mA

Input – Measuring circuit

1–10V DC (measur ing voltage coming from level electrode)

Output – Control circuit

2 volt-free relay contacts
Max. contact rating with switching voltages of 24 /115 /230 V AC: 4A resistive,

0.75 A inductive at cos ϕ 0.5.
Max. contact rating with switching voltage 24V DC: 4A
Service life of relay: 30x10

6

switching cycles
2 optocouples (npn), short-circuit protected due to inherent current limiting
characteristics
Max. ratings: 70 V, 10mA

Indicators and adjustors

1 green LED
yellow LED

OPERATION, 1 red LED HIGH LEVEL, 1 yellow LED DEFECTIVE ELECTRODE, 1

MALFUNCTION IN CABLE

Protection

IP 10 to DIN 40050

Max. admissible ambient temperature

0°C to + 70°C

Case

19" slide-in unit with front panel to DIN 41494 par t 5 and rear 32 way Euro card
connector to DIN 41612 for installation into 19" magazine
Front panel: aluminium

Weight

Approx. 0.6 kg

7

Installation

Design “c”/“d”

1. Install guide rails and screw-type connector into 19" magazine.

2. Insert 19" slide-in unit into the guide rails until it hits the stop.

3. Fasten the fixing screws .

Tools

n

Screwdriver for slotted screws, size 5 mm, completely insulated acc. to VDE 0680

F

8

Wiring

Design “c”/“d”

Wiring is effected via the 32 pole screw-type connector.
Use screened three-core cable, conductor size 0.8 mm², max. cable length 500 m for
the supply of the electrode.

Wiring diagramm

24V DC

2

C28
A28

A30
C30

A24
C24

1

DC

DC

12V DC

M

C16

C18

A18

1

32

NRG 211

12V DC 12V DCNRS 2-4 NRS 2-4

MM

III

NRS 2-4

A22

C22

A20

C20

C 8
C 12
A 10

A 2
A 6
C 4

3

4

MAX

5

6

7

Fig. 3

C16

C18

A18

1

1

NRG 211

32

C16

C18

A18

9

Key to wiring diagram

1

NRG 211 with Har ting connector

2

Test loop

3

Alarm

4

Malfunction

5

Alarm

6

Malfunction

7

2 NRS 2-4 connected in parallel (redundancy)

Attention

n

Protect the control circuit with a T 2.5 A fuse.

n

Connect screen only to the assigned terminal of the NRS 2- 4.

n

The screen must not make any other electrical contact.

n

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.

10

Commissioning

Warning

The terminal strip of the NRS 2- 4 is live during operation. This presents the
danger of electric shock.
Cut off power supply before removing or inserting the 19" slide-in unit or
undertaking any kind of installation or maintenance work.

Please note

The level switch NRS 2-4 can only be operated and checked in
combination with the level electrode NRG 211-1.

Check wiring

1. Check whether the 19" slide-in unit has been properly installed in the magazine.

2. Check whether the mains supply corresponds to the wiring carried out on
the equipment.

Apply mains voltage

1. Switch on the mains supply and check whether the mains voltage is applied
across the device. The LED is provided for visual check.

B

Check switching functions

1. Check the switching function HIGH LEVEL. To assist with this objective raise the water
level in the tank above the preset high level. The LED located at the NRS 2-4

E

must light up and the corresponding function in the secondary circuit must be
operated.

2. Lower the water level. The level switch NRS 2-4 must switch back to normal
operation.

Check voltage

1. Check the supply and measuring voltage of the level electrode. The voltages can
be measured at the electrode or level switch. Fig. 3 .
Supply voltage: 12 V DC
Measuring voltage: see table 1 – measuring voltage on page 12

11

Table 1 measuring voltages

Measuring
voltage U

M

Decoding

0V–1V Malfunction in electrode supply cable (short circuit or interruption)
1V–4V Electrode exposed or fluid temperature ≥ 395 °C
4V–7V Electrode submerged,

HIGH LEVEL

≥7V Malfunction in electrode (defective insulation seal, leaky stuffing box)

12

Annex

Warning

The terminal strip of the NRS 2-4 is live during operation. This presents the
danger of electric shock.
Cut off power supply before inserting or removing the 19" slide-in unit and
before undertaking any installation or maintenance work.

Fault finding list
After switching on the mains voltage the LED is not illuminated

Fault: The mains voltage is not applied across the equipment.
Remedy: Apply mains voltage. Check installation of the 19" slide-in unit.

Declaration of conformity

We hereby declare that the equipment NRS 2-4 conforms to the following European
guidelines:

n

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

n

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

which are based on the following harmonised standards:

n

LV standard EN 60947-5-1: 1991

n

EMC standard EN 50 081-2, EN 50 082-2

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

Bremen, 28th April 1997

GESTRA GmbH

B

Dr. Anno Krautwald

Dr. Christian Politt

13

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A Unit of Flowserve Corporation

A Siebe Group Company

810427-00/499c · ©1998 GESTRA GmbH · Bremen · Printed in Germany