8.4.2 Fail class
The fail classes described in the Designer’s Reference Handbook are still valid when the power management
option is selected. In addition to these fail classes, the safety stop can be used in the AGC units with power
management.
This means that when a trip + stop alarm occurs, the faulty genset will stay on the busbar until the next priori-
ty genset is started and synchronised to the bus. When the incoming genset has taken the load, the faulty
genset will ramp down the power, followed by trip of the breaker, cooling down of the engine and finally stop.
If the faulty genset has the last priority, or no standby gensets are available, then it will stay on the busbar
and will not trip.
If no genset can start in a safety stop situation, then the faulty genset will not be stopped.
Therefore it is important that the safety stop is backed up, e.g. by a trip and stop alarm or a
shutdown alarm.
8.4.3 Local/remote/timer operation
The plant can be adjusted to local, remote or timer operation (menu 8021). This selection is done in the com-
mand unit, i.e. one of the generator units.
The setting defines how the plant is started while it is in AUTO mode.
The settings can be changed in M-Logic and via display or PC utility software.
Display Utility SW
(Parameter setup)
M-Logic
Local X X X
Remote start X X X
Timer start X X -
The purpose of the selection is to decide whether the plant can be started from the display (local operator),
from remote (e.g. PLC) or by an internal timer. Remote means that the control can be carried out by activat-
ing the digital input or through Modbus/Profibus communication.
8.4.4 Local selection
All operation is carried out on the display. In island operation any generator unit display can be used, and in
load takeover, mains power export and fixed power the mains unit display must be used. The plant mode
must be AUTO.
8.4.5 Remote selection
The plant is started using the digital input "auto start/stop" when "remote" is selected.
Island mode
In island mode the "auto start/stop" input on any of the generator AGCs can be used for starting the plant.
However, DEIF recommends to wire up the "auto start/stop" input to all of the AGCs to be sure that the auto-
matic operation is able to continue even though one of the DGs is taken out for service (power supply discon-
nected to the AGC).
AGC 100 Designer's Reference Handbook
4189340766 UK
Power management (AGC 14x only)
DEIF A/S Page 124 of 152
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