SYSTEM OPERATION – Power Up
Page 43 of 80
3 SYSTEM OPERATION
3.1 POWER UP
With no power applied to the system, all solenoids controlled by the
system will be de-energized. Therefore, if the system includes a digital
helm with manual backup, the operator will have control of the rudder
position through the use of the manual helm pump. In addition, the
backup NFU system will be connected to the directional valve providing
power steering control of the rudder through the backup NFU system, if
one is connected.
Upon restoration of power after a power failure, the system will turn on
and resume control of the rudder under the same mode of steering control
that was active prior to the power failure. The system can also be set up,
through the DSC program, to always turn on in STANDBY/MANUAL mode
at the main control station. Under this power-up option the Station
Transfer function, if provided, will also be invoked in order to allow for
immediate resumption of steering control at remote stations.
In some cases a switched power supply will be provided to the DSC in
addition to the main power supply. The switched power supply is to be
connected through an auxiliary contact on the hydraulic power unit’s motor
starter contactor or through a pump sensor on an engine driven system.
This switched power supply is used by the DSC to determine if the
hydraulic pump is running or stopped. When the pump is not running the
DSC will automatically turn off the directional valve outputs and switch to
manual steering if provided.
When the switched power supply is turned off (i.e. pump stopped), the
system will remain on but all of the solenoid outputs will be turned off. The
indicator for the last selected steering station and mode will begin to flash
and the system will switch to STANDBY/MANUAL mode with its indicator
on steady. The station transfer function, if provided, will also be engaged
and the audio output will sound. The flashing indicator shows the operator
what station and mode the system will return to when the pump is turned
back on. While the system is in this state the operator can change the
mode of steering that the system will return to and silence the audio signal
by pressing the any of the mode buttons. The flashing indicator will follow
the selected mode. If the operator selects the STANDBY/MANUAL mode
the system will change to STANDBY/MANUAL and the flashing indictor
will turn off. The station transfer function will also be disengaged and the
audio indicator will turn off. This allows the operator to turn off the
hydraulic pump and place the steering control system is a standby mode.
Doc No.: MAN01504, 20-02-06 DSC 100 & MCP 100 Manual
To Next Page
Loading...