Flowserve NRS 1-50 For ONE Electrode - 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  /  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 enters the water.
Green LED
for level electrode  is illuminated
Output contacts are closed.
Signal outputs  /  open.
Checking switchpoint and function
Lower water level until it is
below the switchpoint “low
water level (LW)”. Level
electrode is exposed.
Red LED
for level electrode  is flashing
De-energizing delay is running.
Signal outputs  /  are closed instantaneously.
Red LED
for level electrode  is illuminated
Delay time has elapsed, output contacts open.
Signal outputs  /  are closed.
Possible installation faults
Status and indication Fault Remedy
Sightglass indicates level
below switchtpoint “low
water (LW)”, red LED for level
electrode  not illuminated.
Safety circuit closed.
Electrode rod is too long.
Cut electrode rod to the length dictated by the
switchpoint LW.
If installed inside the boiler: Upper
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 LED for level electrode 
is illuminated. Safety circuit
is open.
The electrode rod is too short.
Replace electrode rod and cut new rod to the
length dictated by the switchpoint LW.
The earth connection to the vessel
is interrupted.
Clean seating surfaces and screw in level elec-
trode 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 electrode 1
Test & diagnosis
button
LED alarm  /
operating mode
Test & diagnosis
button
Diagnosis LED
Fig. 12