25
Equipment fails to work
Error
Remedy
Power failure.
Switch on supply voltage. Check all electrical connections.
The thermal fuse has been triggered. LEDs 1 - 4 of
the control units NRS 2-40 and NRR 2-40 are flashing
slowly.
Check ambient temperature, make sure that it does not
exceed 70° C.
The earth connection to the vessel is interrupted.
Clean seating surfaces and screw in the level electrode
together with the joint ring 27 x 32, form D, DIN 7603
(made from 1.4301), bright annealed. Do
not
insulate the
electrode with hemp or PTFE tape!
Electronic module defective
Replace electronic module.
Troubleshooting
Indication, diagnosis and remedy
Attention
For further troubleshooting also observe the installation & operating manuals for con-
trol units NRS 2-40 and NRR 2-40 and the operating & display unit URB.
Action against high frequency interference
High frequency interference can occur for example as a result of out-of-phase switching operations.
Should such interference occur and lead to sporadic failures, we recommend the following actions in
order to suppress any interference.
Provide inductive loads with RC combinations according to manufacturer's specification to ensure
interference suppression.
Control cable(s) must run separately from high-voltage cables.
Increase the distance to sources of interference.
Check the connection of the screen to the central earthing point (CEP) in the control cabinet.
HF interference suppression by means of hinged-shell ferrite rings.
Further Notes
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