Vetus DBPPJA Manual Del Usuario página 11

4 Troubleshooting
When investigating hardware problems in a CAN bus system, visual
inspections, multimeters and oscilloscopes are important tools. For
more advanced diagnostics, a CAN analyser can be used to monitor
and decode CAN traffic.
Fault Explanation
Supply voltage and If a node or the entire bus experiences voltage levels outside the
polarity specified range, this can lead to hardware failure or damage.
Grounding Differences in ground potential between different nodes can
cause problems. It is important to ensure a common ground
reference for all nodes.
Wire lengths Long branches from the main bus line to a device or very long
CAN bus lengths can introduce signal reflections or weakening.
Poor termination The V-CAN system must be terminated with 120 ohm termina-
(termination resistor) tion resistors at both ends. Incorrect or missing termination may
cause communication failures.
Short circuit This can happen between CAN_H and CAN_L lines, or between
one of these lines and ground or power supply voltage. This may
be due to faulty connectors, damaged cables or problems in
nodes.
Signal interruption Broken wires, disconnected connectors or faulty pins can lead
to open circuits. When there is an open circuit, some or all nodes
may not be able to communicate.
Physical damage Physical damage to cables, connectors or nodes (due to wear
and tear, environmental factors or accidents) can cause intermit-
tent or consistent hardware problems.
Electrical interfer- The CAN bus is generally resistant to interference. However,
ence strong electromagnetic interference, often from nearby circuits
or high-current devices, may interfere with CAN signals.
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CAN bus errors refer to physical problems or malfunctions that can
impede the proper functioning of the CAN network.
Below are some examples of CAN bus errors.
Solution
Check the V-CAN supply voltage. This is 12 VDC.
Check the polarity.
Check that all negative terminals are connected
(applies to all system power supplies present)
and that they are in good condition.
Check the CAN bus line length. Apply the
CAN repeater (CANR) if the length exceeds 40
metres.
Check the termination resistors and replace
them if necessary.
Check all V-CAN components.
Check all V-CAN components.
Check all V-CAN components.
Check the entire CAN bus system for the pres-
ence of strong electromagnetic interference
sources.
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