8
Operational Malfunctions
Fault finding list for troubleshooting
Fault:
The switching controller signals low-level alarm before the level in the boiler has fallen
below the low level mark.
Remedy:
Check length of low-water level electrode tip. Measure the conductivity of the process or
boiler water and compare the values obtained with the marking on the name plate.
Check correct wiring of switching controller and electrode in accordance with wiring
diagram,
fig. 10.
Fault:
After raising the water level above the low-level mark, the red LEDs
3
are not
extinguished or only after quite a considerable period.
Remedy:
Check whether a vent hole has been provided in the protection tube. If the electrode is
fitted in an external chamber, check position of isolating valves.
Fault:
One or both red LED(s)
3
light up without the level having fallen below the low-level
mark.
Remedy:
This means electronic failure within the switching controller, i. e. failure of one or both
channels. Replace switching controller.
Fault:
The switching controller signals high-level alarm before the level in the boiler has reached
the high level mark.
Remedy:
Check length of high water level electrode tip. Check whether the electrode tip has contact
with the chamber/protection tube or other boiler internals. Check correct wiring of level
switch and electrode in accordance with wiring diagram,
fig. 10
.
Fault:
After decreasing the water level below the high-level mark, the red LED
4
is not
extinguished or only extinguishes after quite a considerable period.
Remedy:
Check whether a vent hole has been provided in the protection tube. If the electrode is
fitted in an external chamber, check position of isolating valves.
If faults occur that are not listed above please contact our subsidiary or agency in your country.
Danger
The terminal strip of the NRS -9 is live during operation. This presents the danger
of electric shock!
Cut off power supply before fixing or removing the housing cover.
Summary of Contents for NRS 1-9
Page 2: ... Diese Seite bleibt absichtlich frei ...
Page 3: ... Deutsch D Seite 4 21 English Page 22 39 ...
Page 10: ...10 Technische Daten Fortsetzung Maße Fig 2 Fig 3 D 5 120 75 37 5 158 95 ...
Page 11: ...11 Aufbau Fig 6 E B C F D D Fig 4 Fig 5 F A NRS 1 9 D D ...
Page 12: ...12 Funktionselemente NRS 1 9 Fig 7 D G 1 2 3 4 5 6 ...
Page 15: ...15 H C I B A Einbau Fortsetzung Fig 9 Fig 8 Einbaubeispiele F F D ...
Page 28: ...28 Technical Data continued Dimensions Fig 2 Fig 3 5 120 75 37 5 158 95 ...
Page 29: ...29 Design NRS 1 9 Fig 6 E B C F D D Fig 4 Fig 5 D F A ...
Page 30: ...30 Functional Elements NRS 1 9 Fig 7 G 1 2 3 4 5 6 ...
Page 33: ...33 Installation continued Examples of installation H C I B A Fig 9 Fig 8 F F ...
Page 35: ...35 Wiring continued Wiring diagram Fig 10 NRS 1 9 NRG 16 36 1 4 3 2 1 4 3 2 ...
