A53 Z0 9 0020 L En Technical documentation
15.2
COM1: CRE Technology Inter-modules CAN bus
This CAN bus is used as a communication means between modules (GENSYS 2.0/MASTER 2.0) from a single
power plant. Features are:
Active and reactive load sharing.
Automatic load/unload.
Static paralleling.
Dead bus management.
Other data exchange.
Standard CAN bus rules apply here. Please refer to chapter above to connect your modules properly
through CAN bus.
15.2.1
CAN bus fault
CAN communication between CRE Technology modules is continuously checked by each module on the
CAN bus. The quantity of modules connected to the CAN bus should always be the same as the quantity of
modules declared inside each product (sum of GENSYS 2.0 + MASTER 2.0 modules, parameters [E1147] and
[E4006] respectively). Otherwise a CAN bus fault is triggered. This can also be the case if:
Two or more units share the same module number (check parameter [E1179] on each module).
120Ω termination resistors are not used correctly (see chapter above).
CAN bus cable is not properly connected.
This CAN bus fault can only be reset when the correct number of modules is seen on the CAN bus. As with
every protection, the way to handle a CAN bus fault can be selected among the list below. This is done
using parameter [E1259].
Behaviour when a CAN bus fault is triggered
Generator electrical fault
Soft shutdown (with cool down sequence)
Hard shutdown (no cool down sequence)
Droop mode; generates an alarm
Table 55 - CAN bus fault
Note that you may go to Display/Power plant overview pages to try to understand your wiring problem.
For example on a 4 generating sets power plant, if module #3 is disconnected from CAN bus, you will only
see its data in its Display/Power plant overview pages whereas you would see data from modules #1, #2
and #4 on the 3 other modules. This is shown on the drawing below.
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