How the non-connected genset function works
Non-connected genset running in AUTO
The timer starts ....
... the timer expires.
The power management system stops the genset.
7.4.11 Precautionary genset start
During critical operations, you may want to have a genset running and ready to connect. You can therefore configure an input with
the Precautionary genset start function. See Precautionary genset start based on an input below.
In addition, for busbar frequency and voltage alarms, the power management system automatically starts a genset as a precaution.
See Precautionary genset start based on an alarm below.
INFO
There is a maximum of one precautionary genset start per section. That is, only one genset starts when the section has
more than one activated Precautionary genset start inputs and/or multiple alarm conditions for a precautionary genset start.
The display unit for the GENSET controller shows the controller status text: Precautionary standby.
How the precautionary genset start works
When a precautionary genset start is needed, the power management system automatically starts the first available genset in the
priority order for the section. However, the power management system does not connect the genset (that is, the generator breaker
does not close). This genset acts as a running standby.
If a precautionary genset start is needed, and the power management system or an operator closes the generator breaker of the
running standby, then the power management system starts the next genset in the priority list as the running standby.
If the power management system disconnects a higher priority genset, then that genset becomes the running standby. The lower
priority genset is treated as a non-connected genset.
When the input or the alarm is deactivated, then the running standby is not needed. The genset runs until the Local power
management > Non-connected genset > Stop timer > Delay timer expires and the power management system stops the genset.
Alternatively, an operator or external signal can put the controller into SEMI mode and stop the genset.
DESIGNER'S HANDBOOK 4189340911K UK Page 239 of 521
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