Operation:Power Management System (PMS) is installed in the ship’s engine room to look after the safety and operation of the power generating machinery, which includes auxiliary generator, turbine generator, and shaft generator.The Shaft Generator – Motor circuit breaker is usually closed, if not, an operator can close the circuit breaker via the PMS panel. This command is released if sufficient apparent power is available. The two modes explained above is controlled by PMS of the ship.Shaft Motor Mode: The shaft motor mode can be further classified into:Run up assistance (override function):This mode can be selected in the PMS panel and once selected, it will override the currently active mode. The preconditions to enable this mode are:Thermal run-up main engine (load program is active)The auxiliary or/and turbine generator are already connected to the busbar in automatic modeUnder this mode, the shaft motor uses power from the auxiliary and turbine generators and then supplies the additional propulsion power to the main engine during acceleration from maneuvering speed to cruising speed, resulting in the reduction of thermal stress.If the turbine generator and the connected auxiliary engine produces more power than required, the PMS will reduce the power of the Diesel(s) and stop the excess running auxiliary engine to save fuel.ELS (Economical Load Sharing):This mode is useful when turbine generator is available in the engine room. To run this mode, following precondition to be fulfilled:The turbine generator or Diesel generator is already connected to the bus bar in automatic modeFrom the available steam and exhaust heat of the main engine, the turbine generator will produce as much power as possible. The excess power (power left after supplying to ships machinery and cargo load) will be used to power the shaft motor, which will then assist in the propulsion. Consequently, the load on the main engine will reduce and it will consume less fuel oil.This is possible under normal sea running conditions when the turbine generator produces more power than required for the ship network and reefer container supply. In case of raised consumption or lower power production, the PMS will reduce the load of the shaft motor. If the load is nearly 0 KW, the PMS will change the shaft motor to the shaft generator.