Flowserve LRG 16-40 - Manual (Page 25)

5
Systematic malfunction analysis
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:
System Malfunctions
– continued –
Step 1 (Start)
Detach terminal strips
in all sensing units of
bus devices.
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 strips
of the sensing unit
of one system
e. g. NRS ...
and
NRG ... (electrodes)
System O.K.
Detach terminal strips
between bus devices
of the system
e. g. NRS ...
and
NRG ...
System
Malfunction
Use fault-finding
list to identify
the fault(s)!
Cut off power supply
to the equipment!
Check
Use fault-finding
list to correct
fault(s)!
Final test:
Have all faults
been eliminated?
Check next system