Flowserve NRG16-41 - Manual (Page 24)

4
Malfunctions
Fault finding list for troubleshooting
Equipment fails to work – Indication of a malfunction
Fault: In spite of correct wiring and commissioning of the equipment an interference signal
is indicated.
Remedy: The interference signal is caused by H. F. interferences coming from the installation.
For interference suppression of the voltage supply we supply ferrite rings, stock code
4753. The 30 V supply lines should be looped through the ferrite ring five to ten
times. If several controllers are used in the system, they can be fed from the interference
suppressed supply lines. For the interference suppression of the bus line we supply
hinged-shell ferrite rings, stock code 4754. The hinged-shell ferrite rings are clamped
onto the bus line close to the terminal strip of the controller.
Level electrode exposed – High-level alarm
Fault: Mains voltage not applied.
Remedy: Apply mains voltage. Connect electrode according to wiring diagram.
Fault: Thermal fuse has been triggered.
Remedy: The ambient temperature must not exceed 70 °C.
Fault: The electrode housing does not have earth connection to the boiler.
Remedy: Clean seating surfaces and insert metal joint ring (of stainless steel .430) D 7 x 3
to DIN 7603. Do not insulate level electrode with hemp or PTFE tape.
Fault: No data exchange with CAN bus.
Remedy: Check switching controller NRS -4. Connect level electrode according
to wiring diagram.
Fault: The internal insulation of the electrode rod is damaged.
Remedy: Replace level electrode.
High water level reached – no function
Fault: The electrode rods have earth contact.
Remedy: Change installation position.
Fault: The vent hole in the protection tube does not exist, is obstructed or flooded.
Remedy: Check protection tube and, if necessary, provide vent hole.
Fault: The isolating valves of the external measuring pot (optional item) are closed.
Remedy: Open isolating valves.
If faults occur that are not listed above or cannot be corrected, please contact our service centre or
authorized agency in your country.