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Recommend a process controller?

Discussion in 'Hobby Electronics' started by TR, Oct 1, 2004.

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  1. TR

    TR Guest

    A 50 KW alternator driven by an hydraulic motor in turn driven by an
    hydraulic pump directly driven by a Caterpillar 3512 diesel engine on a PTO.
    Caterpillar's speed is variable 650 to 1800 rpm. (used in motor vessel
    propulsion).

    Hydraulics electronically controlled to maintain alternator at 1500 rpm (50
    hz).

    Problem: The controller currently in use is more than twelve years old.
    The
    design of it was ahead of its time in commissioning. But is an electronic
    nightmare now. Two printed circuit boards. Two
    different electronic
    technicians have looked at it and are unable to rectify the system. It will
    not maintain 1500 rpm.

    The way it is set up: Three inputs to the controller. 1) Speed sensor off
    alternator shaft. 2) Hydraulic pump swash plate position feed back. [swash
    plate governing the flow of oil to the motor] 3)
    Desired set point for speed.
    One output: Servo to position the swashplate of the hydraulic pump.
    Controller powered by 24 volt DC.

    My electronics knowledge is not so crash hot. But I'm sure there must be in
    this day and age a simple process controller that can handle the task and is
    easy to set up.

    Can anyone suggest anything please? I'll furnish more info if required.

    Thanks,

    TR
     
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