Design and theory of operation
20169223D 3-7
3.6 D90 Series Distribution Unit
This unit is the main interconnection unit. The 24V DC mains power,
alarm power, solenoid drive, rudder feedback and external alarms
are connected to this unit.
The Distribution Unit always contains at least one Power Supply
Board. Depending on requirement, one additional Power Supply
Board may be added.
In addition, the
Distribution Unit can
contain a combination
of the following
boards:
• Interconnection
Board
• Thruster Interface
Board
• Solid State Board
• Dual Analogue
Board
The Solid State Board
and Dual Analogue Board are identical in size and may be plugged
together to the Interconnection Board or Thruster Interface Board in
any combination.
The different versions of the D90 (also termed D9X) series are:
D90: Provides solid state switching of one directional valve
solenoids, 19-40V DC 3A
D91: Provides solid state switching of one directional valve
solenoids, 110V DC 1A
D92: Provides solid state switching of one directional valve
solenoids, 110/220V AC 1A
D93: Provides two galvanic isolated ±10V or 4-20 mA signals
For double set of directional valves, one extra Solid State Board must
be added.
POWER SUPPLY BOARD
(For detailed diagram refer to SCHEMATICS)
The 24V DC mains input voltage is connected to TB1 - 1/2.
The 24V DC is passing through a filter for protection of noise pulses
that may have been induced in the 24V DC mains supply line. To
obtain galvanic isolation from the 24V mains, for improved noise
protection, the 24V DC is chopped up by the oscillator. The pulsating
Terminals
Power supply board
Bus plug
Interconnection Board
or
Thruster Interface Board
Solid State Board
or
Dual Analog Board
Dual Analog Board
or
Solid State Board
Fig. 3-7
D9X PCBs
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