Operational Malfunctions; Danger; Fault-Finding List For Troubleshooting - Gestra NRS 1-9 Betriebsanleitung

Operational Malfunctions

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.
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.
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