Malfunctions – Flowserve NRS1-40.1 User Manual
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Fault finding list for level electrode NRG 1.-41.1 / control unit NRS 1-40.1
Fault finding list for temperature transmitter TRV 5-40 / control unit NRS 1-40.1
Switchpoint "High water (HW)" exceeded - no high level alarm
Fault:
LED "Power" and LEDs 1 - 4 are not illuminated.
Remedy: Apply mains voltage, wire equipment in accordance with wiring diagram.
Fault:
The electrode rod is too short.
Remedy: Replace electrode rod and cut electrode rod to the length dictated by the switchpoint HW.
Fault:
If the electrode is installed inside the boiler: The vent hole in the protection tube does not exist
or is obstructed.
Remedy: Check installation of level electrode. Make sure that the level in the protection tube corre-
sponds to the actual water level.
Fault:
The earth connection to the vessel is interrupted.
Remedy: Clean seating surfaces and screw in the electrode together with the supplied joint ring
∅27x32 DIN 7603. Do not insulate the electrode with hemp or PTFE tape!
Switchpoint "High water (HW)" not yet exceeded - but a high level alarm is raised
Fault:
The electrode rod is too long.
Remedy: Cut electrode rod to the length dictated by the switchpoint HW.
Fault:
The insulation of the level electrode is faulty.
Remedy: Replace level electrode.
Switchpoint "MAX temperature" not yet exceeded - but a MAX temperature alarm is raised
Fault:
The temperature sensor is defective.
Remedy: Check whether the temperature sensor (Pt 100) gives correct readings (basic values of meas-
uring resistors to DIN 43760 for Pt 100). In case of incorrect readings replace the measuring
element of the temperature sensor.
If faults occur that are not listed above or cannot be corrected, please
contact our service centre or authorized agency in your country.