Flowserve LRR1-40 TDS Control Unit - Manual (Page 28)

28
System Faults
– co ntinued –
S ystematic malfunction analysis
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:
Step 1 (Start)
Detach
terminal strips
in all bus sensors.
Level electrode
Conductivity electrode
Pressure sensor
Temperature sensor
etc.
Step 2
Plug in terminal strip
of the sensor
of the system
e.g. LRR ...
and
LRG ... (sensor)
Check
Use fault-finding
list to identify
the fault(s)!
Final test
Have all faults
been eliminated ?
System Fault
Use fault-finding
list to identify the fault
Cut off power supply
to the equipment !
Step 3
Apply mains voltage
to bus devices
of the system
e.g. LRR ...
and
LRG ...
System O.K.
Detach
terminal strips
between bus devices
of the system
e.g. LRR ...
and
LRG ...
Check next system