8.3.9 Auxiliary supply ON
If a failure appears on the CANbus lines of an AGC, the following alarms appear in the example where a fail-
ure appears at ID 2:
Alarms Defective unit Functioning unit
System alarm Failed CAN tx line Failed CAN tx line
System alarm CAN ID 1P/S MISSING CAN ID 2P/S MISSING
Menu 7533 Miss. all units Miss. all units
Menu 7535 Any DG missing Any DG missing
If the auxiliary supply of the unit where the CANbus is not functioning is connected, the AGC can be adjusted
to another mode than AUTO. In that case, the genset will not take part in the power management routines.
Semi-automatic start or automatic start is possible if the mode is changed to SEMI or AUTO
mode. The only exception to this is when BLOCK mode is selected on a genset AGC. In this
situation, the GB can be closed without allowance from the power management system.
8.3.10 CAN failure mode
In case of a CAN failure on the internal CAN controlling the power management, the system can be set up in
different ways. In menu 7530, it is decided how the power management system will react in case of a CAN
failure.
Example 1:
● A break on the CAN line is made between ID1 and ID2 shown below.
● Both gensets are running and all breakers are closed.
1. If "SEMI-AUTO" is selected, all AGC units will change mode to semi-auto mode, and in this way
the regulators will continue to regulate the load on the gensets which are still "visible" on the inter-
nal CAN communication. This means that in the example with six gensets, the load sharing will
continue between the units which are still connected (ID1-ID3 and ID4-ID6).
AGC 100 Designer's Reference Handbook
4189340766 UK
Power management (AGC 14x only)
DEIF A/S Page 120 of 152
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