Pitch Control Interface (PCI)

Pitch Control Interface

The Q-TAGG Propulsion Control System is an expansion of the Diesel Engine Governor System DEGO IV.

In conjunction with the Pitch Control Interface (PCI) a versatile pitch control system is configured that covers all typical propulsion arrangements such as:

• Single engine with CPP

    • Twin engine with one CPP

  • 2 x twin engine with two CPPs

The controller interfaces with all major CPP manufacturers hydraulic systems.

Constant Power Mode

In this mode the Pitch/RPM working point is controlled to a max allowed propeller slip. This means acceleration without propeller cavitation and running the propeller at its best operational point for all sea- and weather conditions.

The propeller RPM and Pitch is optimized for the chosen kg/hour set-point, i.e. maximizing the nautical miles per kilowatt hour.

The power set-point is entered in the Touch Panel.

Combinator with Load Control

In Combinator mode the telegraph position is translated into engine speed- and propeller pitch set points. The engine(s) are controlled to the speed set point by the governor and the propeller pitch is regulated to the pitch set point according to the combinator curve. If the engine reaches a load limitation, the Load Controller takes over and reduces the pitch until the set-point for the load control is obtained.

Basic PCI unit specifications

Supply in

Two redundant inputs 18-32VDC with indiv. alarms + fuses.

Supply 0ut

5 pce outputs 10V short circuit proof (pot. supply)

4 pce 24V outputs stabilized (I/O supply)

Galvanic Isolation:

4 pce isolated circuits: DEGO1, DEGO2, Process I/O and outputs to valves

Analog Inputs: 5 pce 0-10V, 0-20mA or potentiometer

Digital inputs: 5 pce 24V

Digital Output: 1 pce 24V

O/D box interface

Valve Control:

24V 2A outputs for AH/AST valves

0-10V alt ±10V for analog control valve

Position Feedback:

0-20mA alt. ±10V

- Windmilling protection

- Engine Stall protection

- Propeller phase-synchronization

- Upgrade and retrofit

Control Modes

The system has three modes of operation that are selected from the bridge using the Touch Control Panels:

• Combinator with Load Control

• Constant RPM Mode

• Constant Power Mode