Flowserve NRS 2-40 - Manual (Page 25)

25
Fault: Incorrect function at analogue output. The following actual value indicator
shows incorrect values.
Remedy: Correct the switchpoint settings and the control range settings of the
electrode.
Fault: Switchpoints and actual value indication drift continuously towards 100 %.
Remedy: Deposits have accumulated on the electrode rod. Remove the level
electrode and clean the electrode rod.
Fault: A high-level alarm is raised although the liquid level is below high level.
Remedy: Deposits have accumulated on the electrode rod.
Clean the electrode rod.
Defective electrode insulation. Replace level electrode.
Fault: Liquid level below switchpoint “
LOW LEVEL
”, device fails to switch.
Remedy: Check installation of level electrode and vent hole in the protection tube.
If an external measuring pot is used make sure to open the isolating
valves.
The terminal strip of the NRS 2-40 is live during operation.
This presents the danger of electric shock.
Cut off power supply before mounting or removing the equipment.
Device fails to work – no function
Fault: LED “Power” does not light up.
Remedy: Apply power. Connect the equipment properly, referring to wiring
diagrams.
Device does not work properly
Malfunctions
Danger
Fault-finding list for troubleshooting
Device fails to work – indication of malfunction
Fault: In spite of correct wiring and commissioning of the equipment an
interference signal is indicated.
Remedy: The interference signal is caused by H. F. interferences coming from the
installation. For interference suppression of the voltage supply we supply
ferrite rings, stock code 147253. The 230 V supply lines should be looped
through the ferrite ring five to ten times. If several controllers are used in
the system, they can be fed from the interference suppressed
supply lines. For the intererence suppression of the bus line we supply
hinged-shell ferrite rings, stock code 147254. The hinged-shell ferrite
rings are clamped onto the bus line close to the terminal strip of the
controller.
Restart system after installation.