Application

The ship’s chief engineer required several modes of operation in order to

optimize the performance of the yacht’s electrical system.

During normal operation, the load on the ship can be supplied by one genset, but when seas are

rough and the ship’s stabilizers are running, there is a need for additional generation.

In this mode of operation, both gensets must run continuously.

Also, the ship needs to be connected to shore power when in port.

In order to eliminate a blackout on the ship during the power transfer,

and to reduce the amount of load generated to the shore power,

a scheme was developed to provide an automatic closed transition using a Woodward SPM‐D.

Using the sequencing functionality of the EGCP‐3. the control is configured to

start an additional unit two seconds after the load on the master unit exceeds 75%.

When the load reduces to below 30%, the slave unit is removed from the system after 60 seconds.

The controls needs to be able to trade master/slave relationships,

so a switch is used to place one control in Auto and Run w/ Load (Master)

and the second unit in Auto (Slave). Both controls have the option to operate in either

mode—so if sequencing needs to be avoided, the operator can place both

controls in Auto and Run w/ Load, and both units will share the entire electrical load.