34
NRGS 15-1 - USA - Installation & Operating Manual -
850690-00
Fault indications and troubleshooting
Indications, diagnosis and corrective action
Switchpoints reached - incorrect function
Status and display
Error
Corrective action
Incorrect function when
switchpoints are reached.
Electrode rods were cut to the
wrong length.
Assign electrode rods correctly and change
connections in the electronic circuit board.
Code switch incorrectly set.
Set code switch in line with the selected
function.
Level switch is not working
No supply voltage. ON LED
is not lit.
No power supply.
Switch on supply voltage. Check all electri-
cal connections.
No function.
Ground connection to tank is
interrupted.
Clean sealing surfaces and screw in level
switch with metal sealing ring. Do not
insulate with hemp or PTFE tape.
Electronic circuit board is faulty. Replace electronic circuit board.
Replacing the electronic circuit board
To replace the electronic circuit board, take the level switch out of service and cut off the power
supply.
1. Undo the cover screws
(
and remove the cover
)
.
(Figs. 4, 5)
2. Disconnect the electrode wires from the terminal lugs
"
on the electronic circuit board.
Detach all terminal strips
6
,
8
,
$
.
3. Unscrew the fastening screws
9
for the electronic circuit board and take out the circuit board.
The electronic circuit board is available as a spare part.
4. Install the new electronic circuit board in reverse order to the above.
Note
When ordering spare parts, please state the material numbers on the rating plate.
After you have replaced the electronic circuit board, please repeat the steps
for bringing into service.
