24
NRS 1-51 - USA - Installation & Operating Manual -
850695-00
Operation
Action
Indication
Function
Level electrode exposed
Green LED for
level electrode 1 lights up
Output contacts closed,
signal output 1 open.
Alarm
Level electrode immersed, high
water (HW) exceeded
Red LED for
level electrode 1 flashes
Off delay in progress,
signal output 1 closes without a delay.
Red LED for
level electrode 1 lights up
Delay has elapsed,
output contacts open.
Signal output 1 closed.
Channel 1 test
In operating mode:
Press button 1 and hold until
the end of the test. The level
switch must behave as if there
were an alarm.
Red LED for
level electrode 1 flashes
Alarm simulation in channel 1 or 2.
Off delay in progress,
signal output 1 closes without a delay.
Red LED for
level electrode 1 lights up
Delay has elapsed,
output contacts open.
Signal output 1 closed.
Test is complete.
If the test is failed, replace the level switch.
Operation, alarm and testing
Indicators and operation
Attention
Please check the following before fault diagnosis:
Supply voltage:
Is the level switch supplied with the voltage specified on the rating plate?
Wiring:
Does the wiring conform to the wiring diagram and your chosen switching
combination?
Fault indications and troubleshooting
Indications, diagnosis and corrective action
Test
Fig. 7
Level electrode 1
Test and diagnostic
button
Alarm 1 / operating
state LED
Diagnostic LED
