Table 7.5
Genset priority functions
Function
I/O
Type
Details
Power management > Is first
priority
Digital output Continuous
Activated when the GENSET controller has the first priority in the
section.
Power management > Is first
standby
Digital output Continuous
Activated when the GENSET controller controls the first genset in
the section that the power management system would attempt to
connect when another genset is required.
7.4 Genset start and stop
7.4.1 Introduction
The power management system automatically starts and stops gensets. Gensets are started to ensure that the required power is
always available. Gensets are stopped when enough power is available, for more efficient operation.
AUTO mode for automatic genset starts and stops
The load-dependent start function sends a genset start command when an additional genset is required to satisfy the system's
power requirements. The load-dependent stop function sends a genset stop command when the system's power requirements will
be satisfied even after that genset is stopped.
The load-dependent start function is active whenever at least one GENSET controller is in AUTO mode. However, the function will
only start additional gensets when there are additional GENSET controllers are available in AUTO mode.
The load-dependent stop function is active whenever at two GENSET controllers are in AUTO mode. However, the power
management system will not stop the last connected genset.
INFO
For load-dependent start and stop, only GENSET controllers in AUTO mode are included in the available power
calculations. Power from GENSET controllers that are in SEMI mode is not included.
Section-based power management rules
The load-dependent start and stop function parameters are included in the section-based power management rules.
Overriding automatic genset stops
There may be times when you do not want the load-dependent stop function to be active (for example, during harbour
manoeuvring). You can override load-dependent stops using a digital input (
Power management > Block load-dependent stop
).
Blackout and genset starts
The blackout recovery sequence responds immediately to a dead busbar, while a precautionary genset start responds to busbar
instability.
More information
See
Precautionary genset start
and
Blackout recovery
in this chapter for more information.
The EMERGENCY genset controller response to a blackout is based on its own AC measurements. The EMERGENCY genset
controller response is independent of the power management system response.
More information
See
EMERGENCY genset controller
for more information on the EMERGENCY genset controller blackout response.
DESIGNER'S HANDBOOK 4189340911K UK
Page 227 of 521
