Related Manuals for GESTRA NRS 2-4
Summary of Contents for GESTRA NRS 2-4
- Page 1 Level Switch NRS 2-4 Original Installation Instructions 810427-03 E n g l i s h...
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Page 2: Table Of Contents
ATEX (Atmosphère Explosible) .........................4 Explanatory Notes Scope of supply ............................5 Description .............................5 Function ..............................5 Design ..............................5 Technical Data NRS 2-4..............................6 Dimensions .............................7 Functional Elements NRS 2-4..............................8 Key .................................8 Installation NRS 2-4c ..............................9 NRS 2-4d ..............................9 Tools ...............................9... - Page 3 Contents – continued – Page Commissioning Procedure Checking electrical connection ......................12 Applying mains voltage .........................12 Danger ..............................12 Performance test ..........................12 Table 1 ..............................12 Operational Malfunctions Danger ..............................13 Fault finding list for troubleshooting ......................13 Annex Note on the Declaration of Conformity / Declaration by the Manufacturer CE .........14...
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Page 4: Important Notes
Important Notes Usage for the intended purpose The level switch NRS 2-4 is used in conjunction with level electrode NRG 211 and signals a maximum admissible liquid level. Safety note The level switch is a safety device and must only be installed, wired and commissioned by qualified and competent staff. -
Page 5: Explanatory Notes
Function The NRS 2-4 is a single-channel device equipped with a power supply unit and a voltage detector. The feed voltage (12 V DC) for the electrode is – depending on the operating condition – converted into a measuring voltage. -
Page 6: Technical Data
Technical Data NRS 2-4 Input measuring circuit 1 V to 10 V DC (measuring voltage coming from level electrode) Output measuring circuit 12 V DC (supply voltage for level electrode) Output 2 volt-free relay contacts. Max. contact rating with switching voltages of 24 V, 115 V and 230 V AC: resistive 4 A, inductive 0.75 A at cos j 0.5. -
Page 7: Dimensions
Technical Data – continued – Dimensions 30.48 (6 division units) Fig. 1... -
Page 8: Functional Elements
Functional Elements NRS 2-4 Fig. 2 32-pole screw-type connector, DIN 41612, design D LED “Power” LED “Malfunction in connecting line” LED “Malfunction in level electrode” LED “High level alarm” Fixing screws... -
Page 9: Installation
Installation NRS 2-4 c 1. Mount plastic guide rails in 19 magazine. 2. Install screw-type connector. 3. Insert level switch in 19 magazine and fix it with screws NRS 2-4 d 1. Insert level switch in 19 magazine and fix it with screws Tools Screwdriver 5.5/100... -
Page 10: Electrical Connection
Electrical Connection NRS 2-4 Note that screened four-core cable, e. g. I-Y(St)Y 2 x 2 x 0.8 or LIYCY 4 x 0.52 is required for wiring. Max. length: 500 m. Wire screw-type connector according to the wiring diagram. Fig. 3... -
Page 11: Key
Electrical Connection – continued – Level electrode NRG 211 Test loop for equipment Switching output for “Alarm” (optocoupler) Switching output for “Malfunction” (optocoupler) Switching output for “Alarm” (relay) Switching output for “Malfunction” (relay) Wiring diagram for two high-level switches installed in parallel (redundancy) Attention To protect the switching contacts fuse circuit with 2.5 A (slow-blow) or according to TRD regulations (1.0 A for 72 h operation). -
Page 12: Checking Electrical Connection
Commissioning Procedure Checking electrical connection Make sure that the NRS 2-4 and the associated level electrode NRG 211 are wired in accordance with the wiring diagram. Fig. 3 Applying mains voltage is illuminated. Fig. 2 Apply mains voltage. The green LED Danger The screw-type connector of the NRS 2-4 c/d is live during operation. -
Page 13: Danger
Operational Malfunctions Danger The screw-type connector of the NRS 2-4 c/d 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. - Page 14 For details on the conformity of our equipment according to the European Directives see our Declaration of Conformity or our Declaration of Manufacturer. The current Declaration of Conformity / Declaration of Manufacturer are available in the Internet under www.gestra./de/documents or can be requested from us.
- Page 15 For your notes...
- Page 16 Agencies all over the world: www.gestra.de GESTRA AG Münchener Straße 77 28215 Bremen Germany Telefon +49 421 3503-0 Telefax +49 421 3503-393 E-mail info@de.gestra.com www.gestra.de 810427-03/06-2016cm (808455-03) · GESTRA AG · Bremen · Printed in Germany...
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