Similarly, if a tie breaker closes to join two sections, then the genset priority order for the new section consists of all the GENSET
controllers in the new section.
Priority in a section example
The system has six GENSET controllers. Gensets A, B and C are in section 1. Gensets D, E and F are in section 2. The tie
breaker between sections 1 and 2 is open.
The genset priority order is:
• Genset F, priority 1
• Genset C, priority 2
• Genset D, priority 3
• Genset A, priority 4
• Genset B, priority 5
• Genset E, priority 6
For section 1, the genset priority order is: C, A, B. For section 2, the genset priority order is: F, D, E.
7.3.2 Priority selection method
Configure this parameter under Configure > Parameters > System power management > Priority > Selection. The default
parameter is shown in bold.
Method
Notes
Manual
The genset priority is defined by pushing the push-button 1st priority on the display unit, or using the Modbus
interface.
See Manual genset priority later in this chapter for details.
Delayed
priority shift
This is the same as Manual priority, however, after a change in priorities, the new priority order will not start (or
stop) a genset until the next genset start (or stop) is required by the power management system.
See Manual genset priority later in this chapter for details.
Dynamic
Dynamic priority selection assigns the genset priority according to the order in which the gensets connect to the
busbar. This genset priority selection method maximises system reliability by prioritising the gensets that start
quickly and penalising slow starts and genset failure.
See Dynamic genset priority later in this chapter for details.
Running
hours
The genset priority is assigned to ensure that the genset running hours are all within the same range or offset. The
controller ignores the 1st priority push-button.
See Running hours for genset priority later in this chapter for details.
7.3.3 Manual genset priority
The controller priorities are always synchronised. If you manually change the priority in one controller, then the priorities in all the
other controllers are automatically updated.
If Manual, Delayed priority shift or Dynamic is selected as the priority selection method, then you can select the genset priorities
manually. For Manual and Delayed priority shift, the priorities are only set by the operator, and the controllers do not automatically
change the genset priorities.
DESIGNER'S HANDBOOK 4189340911K UK Page 223 of 521
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