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NRS 1-40
User Manual
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Flowserve NRS 1-40 User Manual

NRS 1-40
Installation Instructions 810635-03
Level Switch Type NRS 1-40
1
Contents
Page
Important Notes
Usage for the intended purpose ......................................................................................6
Safety note ......................................................................................................................6
Danger ............................................................................................................................ 6
Explanatory Notes
Scope of supply ..............................................................................................................6
Description ......................................................................................................................6
Function .......................................................................................................................... 7
Technical data .................................................................................................................8
Installation
NRS 1-40......................................................................................................................... 9
Example of installation ..................................................................................................29
Wiring
Wiring diagram ......................................................................................................3, 9, 10
Basic Adjustment
Node ID .........................................................................................................................11
Factory setting............................................................................................................... 11
Commissioning
Operation
Test Cycle
NRS 1-40................................................................................................................. 12, 13
Alarm
Low-level alarm for water-level limiter ...........................................................................13
Low-level alarm for water-level limiting system .............................................................13
System Malfunctions
Fault analysis, system faults 1 – 7 ........................................................................14 – 22
Operation Malfunctions
Fault finding list for troubleshooting ............................................................................... 23
Emergency Operation
Emergency operation of water-level limiting system ..................................................... 24
Annex
Factory set default node IDs .................................................................................24 – 26
Assigning/changing node ID .........................................................................................25
Declaration of conformity .............................................................................................. 27
2
Wiring Diagram
Twisted pair cable
Twisted pair cable
Protection circuit
– uninterrupted –
Further safety equipment
Note:
The NRS 1-40 is the first equipment of the safety chain.
All relay contacts are internally linked.
Photo-Mos output 24 V- 230 V AC/DC, 100 mA Instantaneous LW alarm, clocked malfunction signal
Fig.1
Control terminal URB 1
Terminating resistor 120 Ω
Fig. 2
Switching controller NRS 1-40
Voltage supply
Terminating resistor 120 Ω
Controller ...
Level electrode NRG16-40
CAN data line
Terminating resistor 120 Ω
Level sensor NRG...
3
Part Drawings
Fig. 3
1
3 2567
4
A
A
B
Fig. 4
4
Key
Indicator LED
1
LED 1: Electrode 1
LED 2: Electrode 2
LED “Bus status”
2
LED “Power”
3
Enter /Test mode
4
Decrease
5
Increase
6
Program key
7
Two-pole code switch
8
9
Ten-pole code switch
A
Terminal strip
Screws for terminal strip
B
Alarm Malfunction
Low-level alarm Multifunction
Low-level alarm Multifunction
5
Important Notes
Usage for the intended purpose
Use switching controller NRS 1-40 only in conjunction with GESTRA level electrode NRG 16-40, NRG 17-40 or NRG 19-40 for signalling low-water level (min. alarm).
Safety Note
Installation must only be performed 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 safety device.
Danger
The terminal strip of the NRS 1-40 is live during operation. This presents the danger of electric shock. Cut off power supply before fixing or removing the housing cover.
Explanatory Notes
Scope of Supply
NRS 1-40
1 Switching controller NRS 1-40 (plug-in unit in plastic case with terminals) 1 Terminating resistor 120 Ω 1 Installation and service manual
Description
The controller type NRS 1-40 is a self-monitoring low-water level limiter with periodic self-checking and monitoring feature of the output relay contacts, to be used in conjunction with one level electrode type NRG 16-40, 17-40 or 19-40. The controller has the following function:
6
Explanatory Notes – continued –
Description – continued –
■ Low-water level alarm with one level electrode
The equipment detects the min. water level (low-level limiter) and complies with the German regulations for use in steam and hot-water plants operating without constant supervision according to TRD 401, TRD 602 and TRD 604.
When used with two level electrodes type NRG 16-40, 17-40 or 19-40, the controller NRS 1-40 constitutes a high-integrity low-water level limiter system with periodic self­checking. The controller features the following function:
■ Low-water level alarm with two level electrodes
This equipment combination detects the min. water level (low-level limiting system) and complies with the German regulations for use in steam and hot-water plants operating without constant supervision according to TRD 604, sheet 1 and 2 (24/72 hours operation without constant supervision).
This item of electrical equipment complies with the Technical Regulations on Protection Circuits to DIN VDE 0116 (prEN 50156).
The level data are transferred from the electrode NRG 1...-40 to the controller via CAN bus using the CANopen protocol. Only one low-level limiting system may be used per CAN-based network.
Function
At regular intervals the level electrode NRG 1...-40 sends a data telegram to the controller NRS 1-40. The data transfer is effected by means of a CAN bus according to ISO 11898. The transferred measuring data are constantly evaluated by the controller. A periodic self-checking routine tests every 3 seconds the integrity of the system and its safety functions, with a malfunction in the controller resulting in immediate boiler shut­down. When the CAN bus line and, consequently, the data transmitting cycle are interrupted, the controller sends a visual signal to indicate a faulty condition and the relays are instantaneously de-energized (fail-safe position).
The controller also facilitates user-friendly performance tests and detection/ evaluation of malfunctions. To guarantee the correct and safe functioning of the low­level limiter a min. electrical conductivity of 0.5 µS/cm at 25 °C is required.
The relay de-energizing delay is normally set to 3 seconds at the factory but delays of 15 to 25 seconds are available on request.
Apart from the burner protection circuit there is also a separate Photo-MOS make contact output for remote indication.
The automatic self-testing routine of the switching controllers checks every 3 sec. their safety functions. The corresponding functions of the level electrodes will be tested by the electrode's self-checking routine every 10 sec.
The malfunction information is updated with every self-test. If no faults have ocurred the malfunction information will be deleted automatically. If faults persist the malfunction information remains stored.
As part of the automatic self-testing routine of the switching controller, the switching-off of the output relays every 6 hrs is checked, too. If a fault is detected the information on this malfunction will be saved accordingly.
7
Explanatory Notes – continued –
Technical Data
Type approval no.
TÜV · WB · 99-403 EG BAF-MUC 0202 103881 002
Input
Interface for CAN bus to DIN ISO 11898 CANopen protocol
Output voltage supply for electrodes
18 – 36 V, short-circuit protected
Output for protection circuit
Two volt-free relay contacts, locally connected in series. Max. contact rating for switching voltages 24 V AC/DC, 115 V AC and 230 V AC: 4 A resistive/inductive. Contact material: silver, hard-gold plated
Interference suppression
Provide contactor with external RC combination (100 Ω / 47 nF)
Signal output
Photo-MOS output, instantaneous with low level, timed malfunction signal, max. contact rating for switching voltages 24 V AC, 115 V AC and 230 V AC/DC: 100 mA resistive
Relay de-energizing delay
Output “Low-level alarm”, set to 3 sec. (standard), optional for e. g. marine applications 15 sec. or 25 sec., internally linked for relay contact test
Indicators and adjustors
4 pushbuttons “Parameterisation/TEST” 1 red LED “Low-level alarm electrode 1” 1 red LED “Low-level alarm electrode 2” 2 red LEDs “Multifunction” 1 red LED “Bus status” 1 green LED “Power” 1 ten-pole code switch: 7 poles for setting node ID, 3 poles for setting baud rate 1 two-pole code switch for limiter/limiting system
Internal self-checking routine
Every 3 seconds
Periodic testing of output relay contacts
Every 6 hours
Supply voltage
230 V +/–10%, 50/60 Hz 115 V +/–10%, 50/60 Hz (optional)
Power consumption
10 VA
Sensitivity
≥ 0.5 µS/cm at 25 °C
Protection
Enclosure: IP 40 to DIN EN 60529 Terminal strip: IP 20 to DIN EN 60529
Admissible ambient temperature
0°C to 55°C
Enclosure material
Front panel: polycarbonate, grey. Enclosure: polycarbonate, black
Weight
Approx. 0.8 kg
8
Installation
NRS 1-40
Installation on mounting rail
1. Clip switching controller onto mounting rail 35 x 15 mm (DIN EN 50022):
2. Align switching controller, see Fig. 11, Fig. 12
Note
■
If an external measuring pot is used, each level electrode type NRG 16-40 requires one switching controller NRS 1-40 and one GESTRA monitoring unit SRL 6.
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 power consumption of the 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 more than 125 m (up to 1000 m) is desired, make sure to modify the baud rate accordingly. Refer to pages 25 and 26 for more details.
UNITRONIC® is a registered trademark of LAPP Kabelwerke GmbH, Stuttgart
9
Wiring – continued –
Wiring Diagram
Wiring diagram see page 3.
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 (1.0 A for 72 hrs operation).
■
If 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. 2
■
Use only one water-level limiting system per CAN bus network.
■
The CAN bus line must not be interrupted while operating with one or more system components.
An interruption will result in disconnection caused by a malfunction.
If the switching controller has to be replaced be sure to remove first the terminal strips , Fig. 4
Note: Make sure that all system components connected are
operating
before removing the CAN bus line from the terminal strip.
A
not
10
Note
■
Connect screen only to terminal 3, ensuring electrical continuity and connect equipment once to the central earthing point (CEP).
■
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, e. g. 0.1 µF/ 100 Ω.
■
Despite 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 page 23.
■
In the event of a shut-down due to a malfunction the signal output (terminals 7 and 8) is cyclically opened and closed in order to ensure an optical distinction between “Low-level alarm” (signal output closed) and “Malfunction shut down”.
If necessary connect terminals 7 and 8 externally to an indicator lamp,
Fig. 1.
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