Description Générale

"SERIN/CCB" is an unit whose goal is studying low power servo systems. It is a low power DC motor speed control trainer that has a breakdown


This trainer is a basic version of the Advanced and Computerised "SERIN/CC" Trainer, being advisable for an introductory study of closed and

open loop control systems.

It consists of an electromechanical unit with an DC motor and a tachometer, attached through an inertial wheel, mounted on a steel box that

contains the power stage and the acquisition and control board, as well as the supervision and control software.

This set allows open and closed loop control, control and generation of command variable, ramp generator, proportional error amplifier and PID,

current limiter, PWM modulator, turn inversion control, start and stop control, braking control, and breakdown simulator, that allows introducing a

great number of dysfunctions so that students may diagnose nature and location of the fault, without risking the integrity of the equipment.

Unit control may be done manually, on the unit itself, basically or in a more advance way through the control software SCADA. This control software

can do two kinds of control: Open-loop and Closed-loop control.

The base unit has four different parts as seen on the front panel:

- Connection zone for motor and tachogenerator.

- Manual or Compute rised Speed control. There is a lever-like switch for selecting the kind of control.

- PID zone. Here, the values of the PID constants can be manipulated (Proportional, Integral and Derivative). This functionality is only available for

PC mode, the speed control lever has to point to PC.

- Turning and stop control zone. Allows changing the turning sense and stopping the motor.

Simple integrated circuits to be able to analyse independently each functional stage.

Visible components with 2 mm connectors for voltage and current measurement.

Control through PWM pulses and power stage configured with MOSFET transistors.

Des exercices et pratiques guidées


  1. Some Practical Possibilities of the Unit:
  2. Open loop control response.
  3. Demonstration of a bracking ramp functioning.
  4. Functioning of a PWM modulator and the response of the system.
  5. Closed loop or feedback control through a Proportional control (P).
  6. Closed loop or feedback control through a Derivative control (D).
  7. Closed loop or feedback control through a Proportional-Integralcontroller (PI).
  8. Closed loop or feedback control through a Proportional-Derivative controller (PD).
  9. Achievement of an over damped system using a closed loopsystem.
  10. Achievement of a critically damped system using a closed loopPID.
  11. Instability, a characteristic of closed loop systems.
  12. Stabilisation of an unstable system.
  13. Faults simulation: Type of faults including on the unit:3
    1. Fault 1: The absolute value of the feedback signal from the tachogenerator is not calculated for its subtractionfrom the reference, thus, for one of the turning senses, the error is wrong.
    2. Fault 2: The value of the Proportional constant of the PID is divided by ten with the user unable to detect it but itseffect.
    3. Fault 3: The value of the Integral constant of the PID is divided by ten with the user unable to detect it but itseffect.
    4. Fault 4: The value of the Derivative constant of the PID is divided by ten with the user unable to detect it but itseffect.
    5. Fault 5: The signal from the tachogenerator is modified, making the PID control to believe that the speed isten times lower to the real one.
    6. None of these faults are exclusive, being possible to combine them.



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