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  • Users: hapetter
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  1. hapetter

    Temperature PID closed loop

    Hi. I have an application where i want to control the temperature in a room with a resistive load, Controlling the load with a PLC. Ok so im going to use a powercontroller. The power controller takes 4-20mA and controls the load 0-100%. To be able to control the temerature due to a temperature...
  2. hapetter

    heat control

    Hi. I like to control an electrical underfloor heating termostat with my PLC (Beckhoff). I like to be able to set setpoint (Temperature) and read flor temperature in the PLC 4-20ma or 0-10V is good, but also any bus signal is fine However I cant find a sutible termostat for this job. Any...
  3. hapetter

    CitectFacilities HMI/SCADA

    Hi, Anyone experience with Citect SCADA software. Im planning to use it in a building automation project. The vendor says it (CitectFacilities) is compleatly free. I find this hard to belive. It seems to be such a complex and powerful software. Is this true? Is it a good software? Thanks...
  4. hapetter

    Analog Output Scaling - Beckhoff

    Hi. I have an application where I going to control a servo motor. The input to servo motor driver card is +-10V. So I have a +-10V output card in my Beckhoff CX1030 controller. The position of the servo is +-30degree, hence +-10V is +-30degree. The speed of the servo is given by frequency of...
  5. hapetter

    Array of struct, ST language

    Hi. I try to implement an array of struct in IEC61131-3 ST language. The C code look like this: Code: Struct BDD { Unsigned char a1; Unsigned int a2; Unsigned int a3; Unsigned int a4; } struct BDD BDD_table[4] = { {'X', 1, 1, 2}, {'a', 0, 100, 0}, {'a', 1, 100, 2}, {'X', 2, 5, 4} };So...
  6. hapetter

    Using a PLC to control an analog driver board

    Hi. Im going to control a galvanometer (control of a mirror - set position (angle), set velocity, position feedback) with an analog driver board. The driver galvanometer is controlled like this: analogue input (selectable +/-3, 5, 8 or 10V). The position output is always +/-3V. Depending on...
  7. hapetter

    Dynamic simulation

    Hi. Im try to do a simulation. Its a complex assembly and I use automatically convert constraints to standard joint to save time. Now this is ok. However I like to delete some joints and change some welded groups but its not possible to delete or change anything. Why? Do I have to build...
  8. hapetter

    Optocupler question.

    If I have a sine AC signal (50Hz) signal going into a optocupler. How will the output look like?
  9. hapetter

    isolation transformer

    I need an isolation transformer. ratio 1:1, for PCB, low noise. Input voltage is 0-220VAC. Any suggestion? Thanks! Best Regards Hans Pettersson
  10. hapetter

    Voltage limiter with isolation and filter

    Im going to measure frequency from a hydro generator. task: The original signal is from the potential transformer (pt) connected to the terminals of the generator. This signal is first fed to an isolation transformer to isolate the digital side. Then the isolated signal goes through a filter...
  11. hapetter

    center of gravity

    I use inventor 5.0 I have some problem to understand the center of gravity function. Where is the reference point? Is it possible to se it visual? Kind Regards Hans

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