Related Manuals for GESTRA NRS 1-56
Summary of Contents for GESTRA NRS 1-56
- Page 1 Level Switch NRS 1-56 Original Installation & Operating Manual 850142-00 E n g l i s h...
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Page 2: Table Of Contents
Functional elements and dimensions ......................15 Installing the NRS 1-56 level switch ......................16 Electrical connection safety notes ....................... 16 Wiring diagram for the NRS 1-56 level switch .................... 17 Electrical connection ............................ 18 Connecting the 24 V DC power supply ..................... 18 Connecting the output contacts........................ - Page 3 Action against high-frequency interference ....................28 What to do in the event of system malfunctions..................29 Taking out of service ............................ 29 Disposal ................................ 29 Returning decontaminated equipment ......................29 EU Declaration of Conformity ........................30 NRS 1-56 - Installation & Operating Manual - 850142-00...
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Page 4: Content Of This Manual
You can find the latest Installation & Operating Manuals on our website: http://www.gestra.com/documents/brochures.html © Copyright All rights reserved. Any misuse, particularly reproduction and dissemination to third parties, is not permit- ted. The General Terms & Conditions of GESTRA AG apply. Scope of delivery/Product package 1 x level switch ■ ■... -
Page 5: How To Use This Manual
How to use this Manual This Installation & Operating Manual describes the correct use of the NRS 1-56 level switch. It applies to persons who integrate this equipment in control systems, install, bring into service, operate, maintain and dispose of this equipment. Anyone carrying out the above-mentioned activities must have read this Installation &... -
Page 6: Types Of Warning
Warning of a dangerous situation that may possibly result in death or serious injury. CAUTION Warning of a situation that may result in minor or moderate injury. ATTENTION Warning of a situation that results in damage to property or the environment. NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 7: Specialist Terms/Abbreviations
Here, we explain some abbreviations, specialist terms, etc., which are used in this Manual. NRG .. / NRS .. GESTRA equipment and type designations, see page 8. SELV Safety Extra Low Voltage NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 8: Usage For The Intended Purpose
The NRS 1-56 level switch also indicates two alarm states, which can be configured as MIN and MAX. Overview of possible unit combinations Level switch... -
Page 9: Applicable Directives And Standards
Usage for the intended purpose Applicable directives and standards The NRS 1-56 level switch has been tested and approved for use in the scope governed by the following directives and standards: Directives: Directive 2014/68/EU Pressure Equipment Directive ■ ■ Directive 2014/35/EU Low Voltage Directive ■... -
Page 10: Basic Safety Notes
Check that the plant is not carrying live voltage before commencing work. ■ ■ Faulty equipment jeopardises plant safety. If the NRS 1-56 level switch does not behave as described on page 23, it may be faulty. ■ ■ Perform failure analysis. -
Page 11: Function
Function The NRS 1-56 level switch measures using the conductivity principle and makes use of the electrical conductivity of the water to do this. The level switch is designed for different conductivities and for connection to four electrode rods in total. -
Page 12: Technical Data
Maximum switching current - 8 A at 250 V AC / 30 V DC - cos ϕ = 1 ■ ■ Inductive loads must have interference suppression (RC combination) as specified by the ■ ■ manufacturer Required external fuse for output contacts T2.5A ■ ■ NRS 1-56 - Installation & Operating Manual - 850142-00... - Page 13 ◆ ■ 2 x 1.5 mm stranded with sleeve ◆ ■ Housing attachment: Mounting clip on support rail TH 35 (to EN 60715) ■ ■ Weight Approx. 0.2 kg ■ ■ NRS 1-56 - Installation & Operating Manual - 850142-00...
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Page 14: Name Plate/Identification Nrs 1-56
Disposal information Fig. 3 CE marking The date of production is printed on the side of the equipment. Factory settings The NRS 1-56 level switch is delivered with the following factory default settings: Function: Inlet control ■ ■ Sensitivity: > 10 μS/cm at 25 °C ■... -
Page 15: Functional Elements And Dimensions
Front membrane with LED, see page 23 removing the lower terminal strip. Lower terminal strip Equipment settings, 4-pole code switch, for setting the function see page 22. and sensitivity Housing Support rail TH 35 NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 16: Installing The Nrs 1-56 Level Switch
Installing the NRS 1-56 level switch The NRS 1-56 level switch snaps onto a TH 35 support rail in a control cabinet. DANGER There is a risk of electric shock during work on electrical systems. Switch off the voltage to the plant before you install the equipment. -
Page 17: Wiring Diagram For The Nrs 1-56 Level Switch
Alarm 1 (MIN/MAX) electrode rod Pump 2 electrode rod Pump 1 electrode rod (pump ON for inlet control) (pump OFF for inlet control) Functional earth Tank or reference electrode Fig. 5 NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 18: Electrical Connection
Electrical connection Connecting the 24 V DC power supply The NRS 1-56 level switch is supplied with 24 V DC. ■ ■ A safety power supply unit that delivers a Safety Extra Low Voltage (SELV) must be used to supply the ■ ■... -
Page 19: Connection Examples
MIN/MAX alarm and pump (ON/OFF) / sensitivity (> 10 μS/cm) with 4 x NRG 16-4 1 2 3 4 5 6 7 8 NRG16-4 NRG16-4 NRG16-4 MAX (Alarm 1) NRG16-4 Pump OFF Pump ON MIN (Alarm 2) Fig. 8 NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 20: Discharge Control - Various Level Electrodes Connected
MAX alarm and pump (ON/OFF) / sensitivity (> 10 μS/cm) with NRG 16-36 1 2 3 4 5 6 7 8 NRG 16-36 MAX1 (Alarm 1) Pump OFF Pump ON Fig. 11 NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 21: Changing The Equipment Settings
When your settings are complete: Plug the lower terminal strip back in. ■ ■ Switch the mains voltage back on. The equipment restarts. ■ ■ 2 3 4 2 3 4 Fig. 12 NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 22: Configuring The Function And Sensitivity
Alarm 2 = MIN / Alarm 1 = MAX (factory setting) Alarm 2 = MAX / Alarm 1 = MAX Sensitivity > 10 μS/cm (factory setting) Sensitivity > 0.5 μS/cm Fig. 13 NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 23: Bringing Into Service - Starting, Switchpoints And Function Test
Fill the tank until the water is above the “Pump OFF” level. The Pump LED The pump relay is de-energised. The “Pump OFF” electrode rod does not light up Contacts 19/20 are open. is immersed. NRS 1-56 - Installation & Operating Manual - 850142-00... - Page 24 MIN electrode rod is no longer LED 1 or 2 lights up red, closed, 17/18 are open. immersed. depending on the configuration * Factory setting of output contacts Alarm 2 = MIN NRS 1-56 - Installation & Operating Manual - 850142-00...
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Page 25: Bringing Into Service - Operation, Testing
LEDs flash to alert the user. If Alarm 1 and 2 are both configured as MIN or MAX alarms, there is no plausibility check of the two electrode rods. NRS 1-56 - Installation & Operating Manual - 850142-00... - Page 26 If a genuine alarm occurs, this will not be tested during the test sequence. ■ ■ Faulty equipment jeopardises plant safety. If the NRS 1-56 level switch does not behave as described in this section, it may be faulty. ■ ■ Perform failure analysis.
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Page 27: System Malfunctions
Disconnect all poles of the supply cable from the mains and secure so they cannot be ■ ■ switched back on. Check that the plant is not carrying live voltage before commencing work. ■ ■ NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 28: Indication Of System Malfunctions
Check the shield connection to the central earthing point (CEP) in the control cabinet. ■ ■ Suppress HF interference using hinged-shell ferrite rings. ■ ■ Route the connecting cables to the level electrodes separately from power lines. ■ ■ NRS 1-56 - Installation & Operating Manual - 850142-00... -
Page 29: What To Do In The Event Of System Malfunctions
Check that the equipment is not live. Unscrew and pull off the upper and lower terminal strips, see Fig. 4 A; C Release the slider holder on the base of the equipment, and detach the NRS 1-56 level switch from the support rail. -
Page 30: Eu Declaration Of Conformity
EU Declaration of Conformity We hereby declare that the NRS 1-56 level switch conforms to the following European Directives: Directive 2014/35/EU Low Voltage Directive ■ ■ Directive 2014/30/EU EMC Directive ■ ■ Directive 2011/65/EU RoHS Directive ■ ■ Please see our Declaration of Conformity for details on the conformity of our equipment with European Directives. - Page 31 For your notes NRS 1-56 - Installation & Operating Manual - 850142-00...
- Page 32 You can find our authorised agents around the world at: www.gestra.com GESTRA AG Münchener Strasse 77 28215 Bremen Germany Phone +49 421 3503-0 +49 421 3503-393 e-mail info@de.gestra.com www.gestra.com 850142-00/10-2019cm (808002-00) · GESTRA AG · Bremen · Printed in Germany...
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