7. Power management
7.1 Power management principles
7.1.1 Introduction
Power management ensures that the required power is available, the system runs as efficiently as possible, and the system
responds appropriately to changes. This requires the controllers to share information and work together.
Power management scope
The power management system performs the following functions:
• Takes action to prevent blackouts
• Restores power after a blackout
• Automatically starts and stops gensets based on the load
• Shares the load between the generators
• Manages the genset priority
• Loads and de-loads generators
• Handles the shaft generator
• Handles shore connection
• Handles the bus tie breaker
• Includes the position of externally controlled breakers in power management calculations
• Manages heavy consumers
• Calculates the available power in the system
Control and modes
The controllers should normally be under power management control. The GENSET and EMERGENCY genset controllers can then
be in either AUTO or SEMI mode. The power management system functions best when all the controllers are in AUTO mode. SEMI
mode is a type of service mode, and controllers should not normally be in this mode.
A controller is under switchboard control when the operator or an external signal activates the Mode > Switchboard control digital
input, or deactivates the Mode > PMS control digital input. For certain errors, the power management system can also force
controllers under switchboard control.
More information
See System principles, Control and modes for more information.
DESIGNER'S HANDBOOK 4189340911K UK Page 207 of 521
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