CAUTION
The genset can be started from the local engine control panel, if such is installed. Therefore, DEIF recommends avoiding
local cranking and starting of the genset.
Block mode on a mains controller
If the mains controller is in block mode, it cannot perform any breaker operations. If any breaker is closed when the mains controller
is put into block mode, the mains breaker will be opened, but the tie breaker will remain closed to ensure the genset's ability to
support the load.
The purpose of block mode is to make sure that the mains breaker cannot close onto a transformer that is momentarily non-
functional due to performance of service. When block mode is used on a mains controller in a power management setup, the system
will know that the blocked mains controller will not be available.
Block mode in single DG application
If a genset, which is running in a single DG application with an MB and a GB, is set in block mode, the DG will stop and the GB will
open. When block mode is active the DG, the GB and the MB will not be operational, but if the MB was closed when block mode
was activated, the MB will stay closed.
INFO
Alarms are not influenced by block mode selection.
More information
Block mode is not the same as the Block fail class. See Fail class for more information about the Block fail class.
2.6 Single-line diagrams (no power management)
The following single-line diagrams show a variety of AGC applications. These applications do not require power management
(option G5).
2.6.1 Automatic Mains Failure
DESIGNER'S HANDBOOK 4189341275A EN Page 30 of 196
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