Flowserve NRG 26-40 - Manual (Page 23)

23
Malfunctions
Fault finding list for troubleshooting
Fault: LED “Power” does not light up.
Remedy: Apply mains voltage. Wire equipment according to the wiring diagram.
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 33 x 39 to DIN 7603.
Do not insulate level electrode with hemp or PTFE tape.
Fault: The thermal fuse has been triggered.
Remedy: The ambient temperature must not exceed 70 °C.
Fault: The LED I does not light up. No data exchange.
Remedy: Check level switch/controller. Connect electrode according to the wiring diagram.
The equipment fails to work – no function
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 47253.
The 230 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 47254. The hinged-shell ferrite rings are clamped
onto the bus line close to the terminal strip of the controller.
Operation
continued
Adjusting the attenuation of the level controller
continued
4. Re-insert the CAN bus connector.
Green LED  illuminated: The new attenuation setting has been accepted.
Red LED 2 illuminated: The new attenuation setting has not been accepted. Repeat the adjustment
procedure or replace the electronic insert.
5. Pull out the CAN bus connector. Set the original node ID and baud rate. Re-insert the CAN bus
connector. The level electrode will now use the new attenuation setting.
6. Replace housing cover G and use screws E to fix it.