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Summary of Contents for GESTRA NRS 1-56
- Page 1 Level Switch NRS 1-56 Original Installation & EN (USA) Operating Manual 850697-00-00 English...
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Page 2: Table Of Contents
Discharge control - connection of various level electrodes ............20 Changing the equipment settings ..................... 21 Changing the sensitivity and function .................... 21 Configuring function and sensitivity ....................22 NRS 1-56 - USA - Installation & Operating Manual - 850697-00... - 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 UL components ..........................29 NRS 1-56 - USA - Installation & Operating Manual - 850697-00...
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Page 4: Content Of This Manual
The General Terms & Conditions of GESTRA AG apply. Scope of supply, product package 1 x level switch NRS 1-56 ■ 1 x Installation & Operating Manual ■ NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
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
CAUTION CAUTION Warning of a situation that may result in minor or moderate injury. ATTENTION ATTENTION Warning of a situation that results in damage to property or the environment. NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
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 - USA - Installation & Operating Manual - 850697-00... -
Page 8: Usage For The Intended Purpose
The NRS 1-56 is classified as operating control in accordance with UL 60730-1. The NRS 1-56 level switch also indicates two alarm states, which can be configured as MIN and MAX. -
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: Standards: UL 60730-1 and CAN/CSA E60730-1 ■ General Requirements for Automatic Electrical Controls UL 60730-2-15 and CAN/CSA E60730-2-15 ■... -
Page 10: Basic Safety Information
Check that the plant is not carrying live voltage before commencing work. ■ Faulty equipment is a danger to plant safety. If the NRS 1-56 level switch does not behave as described on page 23, it may be ■ faulty. -
Page 11: Function
Function The NRS 1-56 level switch uses the conductivity of the water to measure the level. The level switch is designed for different conductivities and for connection to a four tipped probe. The level switch functions as an on/off level control system (fill/discharge, switchable), and also indicates when the water reaches two independent alarm states, which can be configured as MIN or MAX. -
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) in accordance with the ■ manufacturer's specification Required external fuse for output contacts T2.5A (slow blow) ■ NRS 1-56 - USA - Installation & Operating Manual - 850697-00... - Page 13 2 x AWG16 (1.5 mm ) stranded with sleeve ◆ Terminal box attachment: Mounting clip on support rail TH 35 (according to EN 60715) ■ Weight Approx. 0.44 lb (0.2 kg) ■ NRS 1-56 - USA - Installation & Operating Manual - 850697-00...
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Page 14: Rating Plate, Identification Nrs 1-56
Use No.18 16 AWG Wire Size Only, Default factory settings Tightening: Torque 0.79Nm or 7lb in. Use with accessory: NRG 10-52, NRG 16-52 The NRS 1-56 level switch is delivered with the following factory default settings: Function: Fill control ■... -
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 function and see page 22. sensitivity Terminal box Support rail TH 35 NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
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 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 fill control) (pump OFF for fill control) Functional ground Tank or reference electrode Fig. 3 NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
Page 18: Electrical Connection
Use a shielded, multi-core TC-ER control cable with minimum wire size AWG 18, ■ e.g., OELFLEX CONTROL TM CY 5G1. Maximum cable length = 328.1 ft (100 m). ■ Route connecting cables separately from power cables. ■ NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
Page 19: Connection Examples
MIN1/MIN2 alarm and pump (ON/OFF) / sensitivity [> 5 ppm(10 µS/cm)] 1 2 3 4 5 6 7 8 NRG 1.-52 Pump OFF Pump ON MIN 1 (Alarm 1) MIN 2 (Alarm 2) Fig. 5 NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
Page 20: Discharge Control - Connection Of Various Level Electrodes
MAX1/MAX2 alarm and pump (ON/OFF) / sensitivity [> 5 ppm(10 µS/cm)] 1 2 3 4 5 6 7 8 NRG 1.-52 MAX 2 (Alarm 1) MAX 1 (Alarm 2) Pump ON Pump OFF Fig. 7 NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
Page 21: Changing The Equipment Settings
When your settings are complete: Re-insert the lower terminal strip. ■ Switch the mains voltage back on. The equipment restarts. ■ 2 3 4 2 3 4 Fig. 8 NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
Page 22: Configuring Function And Sensitivity
Alarm 2 = MIN / Alarm 1 = MAX (factory setting) Alarm 2 = MAX / Alarm 1 = MAX Sensitivity > 5 ppm (10 µS/cm) (factory setting) Fig. 9 NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
Page 23: Bringing Into Service - Starting, Checking Switchpoints And Function
Fill the tank until the water is above the “Pump OFF” level. The Pump LED The pump relay is de-energized. The “Pump OFF” electrode rod does not light up Contacts 19/20 are open. is immersed. NRS 1-56 - USA - Installation & Operating Manual - 850697-00... - Page 24 LED 1 or 2 lights up red, 16/18 are closed, 17/18 are open. rod is exposed. depending on the configuration * Factory setting of output contacts Alarm 2 = MIN NRS 1-56 - USA - Installation & Operating Manual - 850697-00...
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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 - USA - Installation & Operating Manual - 850697-00... - Page 26 If a genuine alarm occurs, this will not be tested during the test sequence. ■ Faulty equipment is a danger to plant safety. If the NRS 1-56 level switch does not behave as described in this section, it may be ■ faulty.
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Page 27: System Malfunctions
Disconnect all poles of the supply cable from the mains and secure so it cannot be ■ switched back on. Check that the plant is not carrying live voltage before commencing work. ■ NRS 1-56 - USA - Installation & Operating Manual - 850697-00... -
Page 28: Indication Of System Malfunctions
Check the connection of the shield to the central grounding point (CGP) 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 - USA - Installation & Operating Manual - 850697-00... -
Page 29: What To Do In The Event Of System Malfunctions
Check that the equipment is not carrying voltage. Unscrew and pull off the upper and lower terminal strips, see Fig. 2 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 For your notes NRS 1-56 - USA - Installation & Operating Manual - 850697-00...
- Page 31 For your notes NRS 1-56 - USA - Installation & Operating Manual - 850697-00...
- Page 32 You can find our authorized agents around the world at: www.gestra.com GESTRA AG Münchener Straße 77 28215 Bremen Germany Tel. +49 421 3503 0 +49 421 3503 393 e-mail info@de.gestra.com www.gestra.com 850697-00/08-2021cm (809144-00) · GESTRA AG · Bremen...
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