Flowserve NRS 1-42 - Manual (Page 21)

21
Fault finding list for troubleshooting
The terminal strip of the NRS 1-42 is live during operation.
This presents the danger of electric shock.
Cut off power supply before mounting or removing the equipment.
Danger
Device fails to work – no function
Fault: LED “Power” does not light up.
Remedy: Turn on the power. Connect the equipment in accordance with the wiring
diagram.
Switchpoints reached / level below switchpoints – no function
Fault: The electrode body does not have earth connection to the vessel.
Remedy: Clean seating surfaces and insert metal joint ring (of stainless steel 1.4301)
D 33 x 39 to DIN 7603.
Do not insulate the level electrode with hemp or PTFE tape!
Fault: The electric conductivity is too low.
Remedy: Set sensitivity to
≥≥≥≥≥
0.5 µS/cm.
Fault: The isolating valves of the external measuring pot (optional item) are
closed.
Remedy: Open isolating valves.
Fault: The vent hole in the protection tube does not exist, is obstructed or flooded.
Remedy: Check protection tube and, if necessary, provide vent hole.
Malfunctions
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 interference 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 the system after installation.