13
Fault finding list for troubleshooting
Operational Malfunctions
Danger
The screw-type connector of the NRS 2-4 c/d is live during operation.
This presents the danger of electric shock!
Cut off power supply before inserting or removing the 19" slide-in unit and before carrying
out any installation or maintenance work.
If faults occur that are not listed above or cannot be corrected, please contact our service centre or
authorized agency in your country.
LED “Power” is not illuminated.
Fault:
Power failure
Remedy:
Measure voltage across A/C 28 and A/C 30, check voltage supply and electric connection
LED “Malfunction in level electrode” and LED “High level alarm” are illuminated.
Fault:
The safety screw of the level electrode has not been removed
Remedy:
Remove safety screw
Remedy:
Level electrode (insulation, stuffing box) defective
Remedy:
Measure measuring voltage across C 18 / A 18
Replace level electrode if measuring voltage
≥
9 V
LED “Malfunction in connecting line” illuminated.
Fault:
Electrode supply line defective (short circuited or interrupted)
Remedy:
Check electrode supply line and wiring
High water level is exceeded but only the green LED “Power” is illuminated.
Remedy:
Level electrode not submerged
Remedy:
Measure measuring voltage across C 18 / A 18
If no voltage can be measured check and, if necessary, change installation of level electrode
Fault:
Preamplifier in level electrode defective
Remedy:
Replace preamplifier if the 12 V supply voltage for the electrode is present but no measuring
voltage can be measured across C 16 / A 18
