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NRS 12

Installation Instructions 81878003

Level Switch

NRS 12

GESTRA Steam Systems

EN

English

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Содержание NRS 1-2

Страница 1: ...1 NRS 1 2 Installation Instructions 818780 03 Level Switch NRS 1 2 GESTRA Steam Systems EN English ...

Страница 2: ...Declaration by the Manufacturer 4 Important Notes Page Explanatory Notes Scope of supply 5 Description 5 Function 5 Components 5 Design 5 NRS 1 2 12 Attention 12 Tools 12 Key 12 Examples of installation 13 Installation Electrical Connection NRS 1 2 14 Note 14 Tools 14 Wiring diagram 15 NRS 1 2 6 Name plate marking 7 Dimensions 8 Technical Data NRS 1 2 9 Key 11 Design NRS 1 2 10 Key 11 Functional E...

Страница 3: ...ction 16 Applying mains voltage 16 Contents continued Commissioning Page Fault finding list for troubleshooting 17 18 Operational Malfunctions Danger 18 Disposal 18 Decommissioning Limit switch MIN MAX 16 Note 16 Performance Test ...

Страница 4: ... and the EMC Directive 2004 108 EC ATEX Atmosphere Explosible According to the European Directive 94 9 EC the equipment must not be used in potentially explosive areas Note on the Declaration of Conformity Declaration by the Manufacturer For details on the conformity of our equipment according to the European Directives see our Declaration of Conformity or our Declaration of Manufacturer The curre...

Страница 5: ... event of power failure The level switch features the following four operating modes n Normal operation no running dry no high water n MIN alarm running dry n MAX alarm high water n Alarm malfunction in level switch or level electrode Two red LEDs indicate low water LW high water HW or system error alarm Components NRG 16 4 Level electrode NRG 16 4 PN 40 ER 50 Level electrode ER 50 NRG 10 52 PN 6 ...

Страница 6: ...ng cycles Contact material silver hard gold plated Sensitivity of response electrical conductivity of water at 25 C 0 5 1000 μS cm or 10 10000 μS cm Electrode voltage 11 V AC free of direct voltage Indicators and adjustors 1 LED for MAX alarm 1 LED for MIN alarm 1 button for simulating a MIN alarm Supply voltage 24 V 110 V 120 V 220 V 240 V 50 to 100 Hz please indicate voltage when ordering When u...

Страница 7: ...e marking Equipment designation Fig 1 Supply voltage Sensitivity of response NRS 1 2 b GESTRA AG Bremen 230 V 50 Hz 3 5 VA Mat Nr 056390 0 5µS cm IP 40 Betriebsanleitung beachten See installation instructions Voir instructions de montage ...

Страница 8: ...8 Technical Data continued Dimensions Fig 2 106 7 32 51 Fig 3 112 85 ...

Страница 9: ...9 Design NRS 1 2 G Fig 6 G B C F E D Fig 4 Fig 5 NRS 1 2 MADE BY GESTRA Test NW MIN NW MAX HW A A ...

Страница 10: ...10 Functional Elements NRS 1 2 NRS 1 2 MADE BY GESTRA Test NW MIN NW MAX HW Fig 7 4 1 3 MAX 55 C MAX 95 IP 65 ...

Страница 11: ...Upper part D Mounting clip E Cable entry soft seal F Cable entry marked in housing G Fixing hole d 4 3 mm 1 Red LED for MAX alarm 2 Red LED for MIN alarm 3 Button TEST LW for simulating a MIN alarm Design Functional Elements Key ...

Страница 12: ... base B 3 Select cable entry E and remove corresponding seal On mounting panel 1 Loosen cover screws A and unplug cover C from its base B 2 Unscrew mounting clip D 3 Drill the hole G marked in the base to 4 3 mm 4 Select cable entry E F and remove corresponding seal 5 Fasten base with two screws M4 onto mounting panel A Cover screws B Base C Cover D Mounting clip E Cable entry soft seal F Cable en...

Страница 13: ...13 Installation continued Examples of installation MAX 55 C MAX 95 IP 65 NRS 1 2 MADE BY GESTRA Test NW MIN NW MAX HW E D B E H F F C A Fig 9 Fig 8 G G ...

Страница 14: ...sulated according to VDE 0680 1 Note n If the terminal for the low level MIN alarm is not connected provide terminals 11 and 12 with a wire bridge as otherwise the LED MIN indicating low water level would be permanently illuminated n Connect screen only to terminal 8 of the level switch n The sensitivity is indicated on the name plate n The rated supply voltage is indicated on the name plate n Whe...

Страница 15: ...ical Connection continued Wiring diagram Fig 10 Fig 11 Wire link please observe note on page 14 MAX HW Drawn position of contacts deenergized alarm MAX HW MIN LW NRG 1 52 ER 5 Supply voltage MIN alarm MAX alarm ...

Страница 16: ... the electrodes are submerged the LED MAX must be illuminated When pressing button TEST the LED MIN must also light up 3 To simulate the condition electrode submerged short circuit the corresponding electrode terminal with terminal 12 4 The electrode is supplied with 11 V AC 20 When the electrodes are exposed this voltage can be measured between the electrode tips and the earth connection by using...

Страница 17: ...ded with a vent hole If the electrode is installed in an external measuring pot check the position of the shut off valves Fault The red LED 2 is illuminated but the water level is above the low level MIN switchpoint Remedy A control channel in the level switch has failed Replace the level switch Low water level no alarm is raised Fault The water level has dropped below the low level MIN switchpoin...

Страница 18: ...MAX mark the red LED 1 is still illuminated or goes out only after quite a while Remedy Check whether a vent hole has been provided in the protection tube If the electrode is fitted in a measuring pot outside the boiler check the position of shut off valves Fault The red LEDs 1 is illuminated without the level having reached the high level MAX mark Remedy A control channel in the level switch has ...

Страница 19: ...19 For your notes ...

Страница 20: ...8227 06 GESTRA AG Bremen Printed in Germany 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 Web www gestra de ...

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