DSC - Inputs
Page 13 of 80
1.3 INPUTS
1.3.1 Power Supply
Description
The power supply for the Digital Steering Control System is typically
derived from the ship’s power source or from Jastram’s Motor Starter and
Alarm Unit. The DSC has a power switch on the side of the enclosure.
After this power switch, the supply is split into three separate circuits each
provided with its own short circuit protection fuse. The power supply is
monitored by the DSC and a fault condition can be displayed if the power
supply falls out of an acceptable range.
In addition to the constant power supply described above, a switched
power supply can also be connected to the DSC. In some cases the
power supply will be switched 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 HPU’s 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.
Specifications
Supply Voltage:............................ 12 or 24VDC, -10% +20%
Power Consumption:.................... Dependent on system configuration
approx. 7 Watts, DSC only
Short Circuit Protection: ............... Controller (F1), 4 Amps
Directional Solenoid (F2), 4 Amps
DHM/Speed Solenoids (F3), 4 Amps
Connector: ...................................5.08mm pitch screw terminals
Installation
Cable conductor (16 AWG) is the suggested minimum diameter based on
a maximum cable length of 200 ft. (61 m). For each additional 100 ft. (30
m) of cable length, the diameter of cable conductors should be increased
by 1 AWG.
Doc No.: MAN01504, 20-02-06 DSC 100 & MCP 100 Manual
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