The 505 has three turbine start modes (manual, semi-automatic or automatic)
from which to choose from. One of these start modes must be chosen and
programmed to perform a system startup. Once a ‘RUN’ command is issued, the
speed setpoint and valve limiter are manipulated automatically by the 505 or
manually by the operator, depending on which start mode is selected. After a
turbine start has been completed, turbine speed will be controlled at a minimum
controlling speed. The minimum controlling speed may be idle if idle/rated is
being used, low idle if the auto start sequence is used, or minimum governor if
neither idle/rated or auto start sequence is used.