Flowserve NRS 1-50 For TWO Electrodes - Manual (Page 19)

9
Commissioning
– continued –
Checking switchpoint and function
Start
Activity Indication Function
Apply
mains voltage.
All LEDs are illuminated.
System is being started and tested,
this takes approx. 0 sec.
Output contacts are open.
Signal outputs  and  are closed.
All LEDs are illuminated for
more than 0 sec.
System malfunction. Possible causes:
Faulty power supply, level switch defective.
Raise water in boiler until the
switchpoint “low water level (LW)”
is ecxeeded. Level electrode(s)
make(s) contact with the water.
Green LEDs for level
electrode  /  illuminated.
Output contacts are closed.
Signal outputs  and  open.
Checking switchpoint and function
Lower water level until it is below
the switchpoint “low water level
(LW)”. Level electrode(s) is/are
exposed.
Red LEDs
for level electrode  /  are
flashing.
De-energizing delay is running.
Signal outputs  and  are closed
instantaneously.
Red LEDs
for level electrode  / 
illuminated.
Delay time has elapsed,
output contacts open.
Signal outputs  and  are closed.
Possible installation faults
Status and indication Fault Remedy
Sightglass indicates level
below switchtpoint “low water
(LW)”, red LEDs for level
electrodes / not illuminated.
Safety circuit closed.
Electrode rod(s) is/are too long. Cut electrode rod(s) to the length dictated by the
switchpoint LW.
If installed inside the boiler: Up-
per vent hole in protection tube
does not exist or is obstructed.
Check installation of level electrode. Make sure
that the level in the protection tube corresponds
to the actual water level.
Water level sufficient. Red
LEDs for level electrodes  / 
illuminated! Safety circuit open.
Electrode rod(s) is/are too short. Replace electrode rod(s) and cut new rods to
the length dictated by the switchpoint LW.
The earth connection to the
vessel is interrupted.
Clean seating surfaces and screw in level
electrode with metallic joint ring. Do not insulate
the electrode with hemp or PTFE tape!
Electrical conductivity of the
boiler water too low.
Set response sensitivity of the level switch to
0.5 μS/cm.
Upper vent hole flooded.
Check installation of level electrode. Make sure
that the level in the protection tube corresponds
to the actual water level.
LED alarm  /
operating mode
Level electrode1
Test & diagnosis
button
LED alarm  /
operating mode
Level electrode 2
Test & diagnosis
button
Diagnosis LED
Fig. 14