Flowserve NRS 1-51 - Manual (Page 18)

8
Operation
Activity Indication Function
Level electrode exposed
Green LED
for level electrode  is illuminated
Output contacts are closed.
Signal output  is open.
Alarm
Level electrode submerged,
high water level (HW)
exceeded.
Red LED
for level electrode  is flashing
De-energizing delay is running.
Signal output  is closed instantaneously.
Red LED
for level electrode  is illuminated
Delay time has elapsed, output contacts open.
Signal output  is closed.
Test channel 1
During operation:
Press and hold down key 
until the end of the test, level
switch must function as if there
were an alarm.
Red LED
for level electrode  is flashing
Alarm simulated in channel  or .
De-energizing delay is running.
Signal output  is closed instantaneously.
Red LED
for level electrode  is illuminated
Delay time has elapsed, output contacts open.
Signal output  is closed. Test finished.
Operation, Alarm and Test
Indicators and adjustors
Fig. 14
Level electrode 1
Test & diagnosis
button
LED alarm  /
operating mode
Diagnosis LED
Attention
Before carrying out the fault diagnosis please check:
Mains supply:
Is the level switch supplied with the mains voltage specified on the name plate?
Wiring:
Is the wiring in accordance with the wiring diagram and the relevant schematic
representation of arrangement?
Troubleshooting
Indication, diagnosis and remedy