Flowserve NRR 2-40 - Manual (Page 23)

23
System Malfunctions
– continued –
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 finding procedure:
Systematic Malfunction Analysis
Step 1 (Start)
Detach terminal strips
in all sensing units of
bus nodes.
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 strips
of the bus nodes
e. g.
NRS ...
and
NRG ... (sensing unit)
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 nodes,
e. g.
NRS ...
and
NRG ...
System O.K.
Detach terminal
strips between
bus nodes
e. g.
NRS ...
and
NRG ...
Check next system