GESTRA NRS 1-40, Original Installation Manual

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29
System Malfunctions
Faulty installation and/or configuration of CAN bus components, excessive temperatures in the devices,
defective electronic component parts or electromagnetic interferences of the supply system can result
in system malfunctions. In the event of a system malfunction the safety circuit (terminal 25 and 29) is
instantly interrupted.
There are four system malfunctions that might occur in the level electrode and the switching controller.
n
Max. admissible temperature in electrode terminal box exceeded
n
No or faulty communication between controller and electrode
n
Fault in CAN bus
n
Failure of 24 V power supply unit built in switching controller NRS 140
The automatic selftesting routine checks the switching controller every 3 seconds and the sensors
(e.g. the level electrodes) every 10 seconds. During each selftesting routine the error messages will
be stored in the switching controller. The error messages remain stored until the cause of the fault(s) is
eliminated. If a malfunction is detected the signal output of the switching controller (terminals 7
and 8) will be opened and closed as a function of the triggering pulse. As part of the automatic self
testing routine the function of the output relays will also be checked every 6 hours.
The terminal strip of the NRS 140 is live during operation.
This presents the danger of electric shock.
Cut off power supply before mounting or removing the terminal strips or the housing
cover.
Danger
NRS 140