Flowserve NRS 1-50 For TWO Electrodes - Manual (Page 21)


Fault Indication and Troubleshooting
– continued –
Diagnosis
Display 1 and activity Display 2 Fault Remedy
LED alarm  and
diagnosis LED 
illuminated. Press and hold
down key 1.
Diagnosis
LED 
flashing.
Malfunction in level electrode ,
malfunction in level switch,
faulty wiring,
faulty measuring voltage.
– check wiring,
– measure electrode voltages,
– clean and, if necessary, exchange
– level electrode,
– exchange level switch.
Diagnosis
LED 
flashing.
Malfunction in level electrode ,
malfunction in level switch,
faulty wiring.
Diagnosis
LED 3
flashing.
Interference voltage causing
malfunction, boiler earth without
PE
Provide screen and earthing,
connect boiler with PE.
LED alarm  and
Diagnosis LED 
illuminated. Press and hold
down key 2
Diagnosis
LED 
flashing.
Malfunction in level electrode ,
malfunction in level switch,
faulty wiring,
faulty measuring voltage.
– check wiring,
– measure electrode voltages,
– clean and, if necessary, exchange
– level electrode,
– exchange level switch.
Diagnosis
LED 
flashing.
Malfunction in level electrode ,
malfunction in level switch,
faulty wiring.
Diagnosis
LED 3
flashing.
Interference voltage causing
malfunction, boiler earth without
PE.
Provide screen and earthing,
connect boiler with PE.
LED alarm  and 
and Diagnosis LED 3
illuminated. Press and hold
down key 1 or 2.
Diagnosis
LED 
flashing.
Malfunction in processor, stand-
by fault.
Observe operating instructions for
the logic unit SRL. Replace level
switch.
Diagnosis
LED 
flashing.
Internal voltage fault.
Replace level switch.
Diagnosis
LED 3
flashing.
Malfunction in relay.
Once the fault is eliminated, the level switch returns to normal operation.
After elimination of the fault switch off the mains voltage and switch it on again after approx. 5 sec.
Fault indication
Status Diagnosis Function Next activity
Faulty evaluation of level
electrode , channel 
Diagnosis LED  and
LED alarm  illuminated.
Output contacts are opened
instantaneously.
Signal output  closes
instantaneously.
next:
Press key 1.
Faulty evaluation of level
electrode , channel 
Diagnosis LED  and
LED alarm  illuminated.
Output contacts are opened
instantaneously.
Signal output  closes
instantaneously.
next:
Press key 2.
Malfunction in level switch
detected.
Diagnosis LED 3 and
LED alarm  and 
illuminated.
Output contacts are opened
instantaneously.
Signal outputs  and  are closed
instantaneously.
next:
Press key 1 or
key 2.
Indication, diagnosis and remedy
– continued –