23
Important
Please check the following before fault diagnosis:
Supply voltage:
Is the level switch supplied with the voltage specified on the name plate?
Wiring:
Does the wiring conform to the wiring diagram?
Fault indications and troubleshooting
Display, diagnosis and troubleshooting
Important
n
For further diagnosis, please refer to the NRG 21-.. NRG 26-21 and NRS 26-1
installation & operating manual.
In the event of a level controller malfunction, the MIN and MAX alarm is triggered and the
equipment restarts.
If the process is continually repeated, the equipment must be replaced.
Note
Faults indicated by the 7-segment display
Fault code
Fault
Remedy
E.005
Faulty level electrode, measuring voltage
< 0.5 VDC
Check level electrode and replace if necessary.
Check electrical connection.
Faulty level transmitter, measuring current
< 4 mA
Check level transmitter and replace if necessary.
Check electrical connection.
E.006
Faulty level electrode, measuring voltage
> 7 VDC
Check level electrode and replace if necessary.
Check electrical connection.
Faulty level transmitter, measuring current
> 20 mA
Check level transmitter and replace if necessary.
Check electrical connection.
E.012
Lower and upper ends of measuring range
changed around
Reset measuring range
E.013
MIN switchpoint higher than MAX switch-
point
Reset switchpoints
In the event of a malfunction, the MIN and MAX alarm is triggered.
