GESTRA NRR 2-40, Installation Instructions Manual

Page: 36 / 40

36
The sources of malfunctions occuring in CAN bus systems operating with several busbased stations
must be analysed systematically since faulty components or incorrect settings can give rise to negative
interactions with intact bus devices in the CAN bus system. These unwanted interactions can cause
error messages in fully functional bus devices, which will make fault detection even more difficult.
We recommend the following systematic fault finding procedure:
Systematic malfunction analysis
System malfunctions
– continued –
Step 1 (Start)
Detach terminal strips
of all busbased
sensors!
Level electrode
Conductivity electrode
Pressure sensor
Temperature sensor etc.
Step 3
Apply mains voltage
to bus devices of the
system
e. g. NRS ...
and NRG ...
Step 2
Plug in terminal strip
of the sensor
of the system
e. g. NRS ...
and
NRG ... (sensor)
System O.K.
Detach terminal
strips between
BUS nodes
of the system
e. g. NRS ...
and NRG ... !
System fault
Use
faultfinding list
to identify the fault(s)!
Cut off power supply to
the equipment!
Test
Use
faultfinding list
to eliminate the fault(s)!
Final test
− Have all faults been
eliminated?
Check next system
Danger
The terminal strip of the equipment is live during operation.
This presents the risk of severe cases of electric shock! Cut off power supply
to the equipment before mounting or removing the terminal strips and the housing cover.