This Trainer is IBM PC based instrument. The software is WINDOWS based. The PID software requires to be SETUP before commencement of the experiment. This trainer has all the facilities to set PID parameters, change the process dynamics, connect external process instruments at its 4-20mA Tx and Rx terminals and observe their status on meters. Create process disturbances using step input. Change the rate of disturbance using built in simulator. It is possible to view the Process Variable (PV), Control Variable (CV) and Set Point

(SP) status on line all the time. It is possible to Zoom a section of the logged data (graph) and make, timing analysis of the process dynamics etc. This has facility to take printouts of either complete responses or a section of the response (zoomed) on normal Dot matrix printer or Laser printer. This can store the acquired responses of a particular experiment on a file for post analysis. Time markers can be set to study the process dynamics to study the behavior of controller.

PID control allows changing the Proportional, Integral, and Derivative Bands. Simulated output having different inertia load using a variable time constant can be simulated. By this method process dynamics can be changed. Disturbance generator provides STEP change to the process dynamics which instantaneously changes the state of output. Adjustable damping control is provided to change the rate-of decay of output. The state of change of controlling input and controlled outputs can be observed, on two analog meters.

One 4-20mA current transmitter and a number of 4-20mA receiver are provided for logging and controlling. Process parameters like, acquiring the status of an external control valve and sending current signal to an external transmitter, any other process, I to P converter or control equipment. The input / output responses can be recorded using an external recorder. This instrument requires an IBM PC with atleast one ISA slot on the motherboard for inserting dedicated ADD-ON card.

The following Screen can be seen on the computer’s screen in response to running PID program.

It is possible to print the response of the PID control functions on your printer for record purpose.
Upon saving this logged trend it is possible to make post analysis of the above controller. The following icons, represent various features available as post analysis options.

Specifications:

• Simulated RC load : 1set
  
• Disturbance Simulator Switch for STEP input: 1 No
  
• Damping control using Potentiometer: 1No
  
• Switch selectable 4 to 20 mA current receiver terminal, when in external mode
  
• Provision to measure controlling input and controlled output, on different terminals
  
• Switch selectable 4 to 20mA Analog Meter: 1 No
  
• Analog Voltmeter: 1 No
  
• Built-in power supply
  
• Interface cable set.

Note: Computer is not supplied with this trainer. Dedicated interface card will be provided for connecting to optional IBM or compatible computer.