Flowserve URB 1 - Manual (Page 72)

72
Troubleshooting
The sources of malfunctions occurring 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 location procedure:
System Malfunctions
Step 1 (Start)
Detach terminal strips
in all sensing units of
bus devices.
Level electrode
Conductivity
electrode
Pressure sensor
Temperature sensor
Check
Use fault-finding list
to correct fault(s).
Final test: have all
faults been
eliminated?
Step 2
Plug in terminal strip
of the sensing unit of
one system, e. g.
NRS ...
and
NRG ... (sensor).
System
Malfunction
Use fault-finding list
to identify the fault(s).
Cut off power supply
to the equipment.
Step 3
Apply mains voltage
to bus devices of the
system e. g.
NRS ...
and
NRG ...
System O.K.
Detach terminal strips
between bus devices
of the sytem e. g.
NRS ...
and
NRG ...