DSC - Inputs
Page 14 of 80
The steering control power supply can be derived from the ship’s main
service switchboard or from Jastram’s Motor Starter & Alarm unit. The
steering control power supply is to be provided with a 10 Amp breaker and
local disconnect switch adjacent to the hydraulic power unit controlling the
rudder.
If a Switched Positive signal is used, this signal is to be on when the
hydraulic power unit motor is running and off when the hydraulic power
unit motor is stopped.
CAUTION:
Ensure main steering control power supply is turned off prior to connection
to the DSC. Check the polarity of power supply connections to the DSC.
Do not turn on the main steering control power supply until all connections
are made and checked.
WARNING:
IN SOME INSTALLATIONS THE POWER SUPPLY TO THE MAIN
STEERING CONTROL SYSTEM MUST BE DISCONNECTED IN ORDER
TO INVOKE OPERATION OF THE AUXILIARY STEERING GEAR. THE
MAIN STEERING CONTROL SYSTEM POWER SUPPLY CAN BE
DISCONNECTED AT ITS SOURCE OR BY USING THE POWER
SWITCH LOCATED ON THE LEFT SIDE OF THE DSC ENCLOSURE.
Commissioning
The DSC must be told if it is connected to a 12 or 24 VDC supply. The
DSC can also be set up to monitor the input power and display an alarm if
the supply falls out of an acceptable range. These settings are input
through the DSC Setup Software in the System Configuration Window
(see section 4.1.1
) or through the DSC menu of the keypad setup (see
section 4.2.1
).
1.3.2 Rudder Feedback
Description
The rudder feedback signal is an analog signal that represents the actual
position of the rudder the DSC is controlling. The rudder feedback input is
capable of supply power to and receiving signals from a resistive device
such as a potentiometer or from a device outputting a differential analog
voltage signal.
The rudder feedback signal is calibrated by the DSC and therefore it is not
necessary to make precise adjustments of the feedback signal with
respect to the actual rudder position. The polarity of the rudder feedback
Doc No.: MAN01504, 20-02-06 DSC 100 & MCP 100 Manual
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