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Summary of Contents for GESTRA NRS 2-50
- Page 1 Level Switch NRS 2-50 NRS 2-51 Original Installation & Operating Manual 819179-05 E n g l i s h...
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Page 2: Table Of Contents
Wiring diagram for level switch NRS 2-51 .....................12 Key ...............................12 Supply voltage connection ........................13 Connecting the output contacts ......................13 Connecting the level electrode/level transmitter ..................13 Connecting the actual value output ......................13 Tools ..............................13 NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... - Page 3 Checking the function of the MIN/MAX output contacts ...............22 Passwort protection ..........................23 Troubleshooting Indications, diagnosis and remedies ......................24 Further information Action against high-frequency interference ...................25 Replacing/taking the equipment out of service ..................25 Disposal ..............................25 NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05...
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Page 4: Important Notes
7-segment LED display. In the event of a malfunction, the MIN and MAX alarm is triggered. If faults occur only in the NRS 2-50, NRS 2-51 level switch, the MIN and MAX alarm is triggered and the system is restarted. -
Page 5: Directives And Standards
Directives and standards VdTÜV Bulletin “Wasserstand 100” (Water Level 100) The NRS 2-50, NRS 2-51 level switch, in combination with the NRG 2.-.. level electrode and NRGT 26-. level transmitter, has type approval in accordance with VdTÜV Bulletin “Wasserstand 100” (Water Level 100), which describes the requirements for water level control and limiting equip- ment for boilers. -
Page 6: Technical Data
12 VDC Outputs: NRS 2-50, NRS 2-51: 2 volt-free relay contacts, 8 A 250 V AC / 30 V DC cos ϕ = 1. Off delay 3 seconds (MIN/MAX alarm, adjustable switchpoint). NRS 2-51: 1 volt-free relay contact, 8 A 250 V AC / 30 V DC cos ϕ = 1. -
Page 7: Product Package
Equipment. File E243189. Product package NRS 2-50 1 level switch NRS 2-50 1 Installation & Operating Manual NRS 2-51 1 level switch NRS 2-51 1 Installation & Operating Manual NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 8: Name Plate/Identification
Name plate, bottom Actual value output Fuse, Connection of provided level electrode/ on site level transmitter Power consumption Supply voltage Type approval number Disposal info Serial number Fig. 2 NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 9: Installation
The advantage of using the adapter is that the status is visible and alarms can be tested without open- ing the control cabinet door. When installed, the adapter has a rating of IP65. Please refer to the panel adapter Installation & Operating Manual 850625-xx for further information. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 10: Dimensions Of The Nrs 2-50, Nrs 2-51
Support rail TH 35, EN 60715 Installation in a control cabinet The NRS 2-50, NRS 2-51 level switch is clipped onto a type TH 35, EN 60715 support rail in the control cabinet. Fig. 1 4 NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 11: In The Control Cabinet: Wiring The Level Switch
Max. three NRS/NRR 2-5.. units can be connected (series connection). Central earthing point (CEP) in control cabinet MIN output contact, off delay 3 seconds MAX output contact, off delay 3 seconds Actual value output 4-20 mA NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 12: Wiring Diagram For Level Switch Nrs 2-51
Max. three NRS/NRR 2-5.. units can be connected (series connection). Central earthing point (CEP) in control cabinet MIN output contact, off delay 3 seconds MAX output contact, off delay 3 seconds Pump output contact Actual value output 4-20 mA NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 13: Supply Voltage Connection
EN 60730-1 or DIN EN 60950 between the current loop and live parts of the equipment that are not supplied with safety extra-low voltage (SELV). Attention Do not use unused terminals as support terminals. Tools Screwdriver size 3.5 x 100 mm, fully insulated to VDE 0680-1. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 14: In The System: Wiring The Level Electrode/Transmitter
In the system: Wiring the level electrode/transmitter Connecting the level electrode/level transmitter The NRS 2-50, NRS 2-51 level switch can be combined in a circuit with the NRG 21-.. and NRG 26-21 level electrodes and the NRGT 26-. level transmitter. -
Page 15: Changing The Factory Settings
Release the terminal strip on the right and left sides, by turning the screwdriver in the direction of the arrow. Remove the terminal strip. Fig. 4 When your changes are complete: Put on the lower terminal strip. Switch the supply voltage back on. The equipment restarts NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... - Page 16 Please pay attention to the NRGT 26-. Installation & Operating Manual when doing this. Do not change the settings of switches S1 and S4 on code switch NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05...
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Page 17: Operating The Level Switch
E.006 Error Level electrode/transmitter defective, measuring voltage/current too high E.012 Error Lower and upper ends of measuring range wrong way round E.013 Error MIN switchpoint higher than MAX switchpoint NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 18: Setting The Measuring Range
Please convert the measuring range into percent! Attention When connecting the NRGT 26-. level transmitter, please set the upper and lower end of the measuring range only in the transmitter. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 19: Bringing Into Service
Or after 30s, the actual value is displayed automatically. If password protection is enabled, you must enter the password before you can change parameters. For the password, see page 23. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 20: Setting The Measuring Range
100% of the measuring range. CAL.P can be adjusted e.g. 25%. between 25 and 100%. Note Adjusting the measuring range: The advantage of option 2 is that the tank only has to be partially filled. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 21: Operation, Alarm And Testing
MAX LED flashes red Off delay in progress. Water level at or above MAX Delay time elapsed, MAX output contacts 21/23 level switchpoint. MAX LED lights up red closed, 22/23 open. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 22: Indications
Turn the rotary knob until the actual value is displayed. Or after 30s, the actual value is displayed automatically. Note The actual value is shown on the 7-segment display. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 23: Passwort Protection
Disabled password protection is re-enabled after 30 minutes with no activity (rotary knob). The password must be entered again. When the equipment is restarted, the parameters are password-protected, if password protection was previously enabled. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 24: Troubleshooting
In the event of a malfunction in the level switch, the MIN and MAX alarm is triggered and the equipment restarts. If the process is continually repeated, the equipment must be replaced. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... -
Page 25: Further Information
In the event of malfunctions or faults that cannot be remedied with the aid of this Installation & Operat- ing Manual, please contact our service centre or authorised agent in your country. NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05... - Page 26 For your notes NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05...
- Page 27 For your notes NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-05...
- Page 28 You can find our authorised 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 Website www.gestra.com 819179-05/11-2021cm (808861-05) · GESTRA AG · Bremen · Printed in Germany...
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