Multivariable process control system

Multivariable Process Control System (Flow, Level, Temperature, Pressure) Volume 1/2

Plan Part 1. Introduction to FLTP Part 2. Main Units of the trainer Part

Introduction How do we control the tank in the field without the

Introduction It is difficult to control the liquid vessel manually because it

Introduction (Cont’d) Therefore, the Process Control System is helpful by controlling the

Introduction Cont’d Multivariable Process Control System can control the flow rate, level,

External Process Unit FLTP-U/EV

Basic panel

1) Main Units of the trainer FLTP 1)Power supply unit

1.1 Power Supply Unit (FLTP-A/EV) Consists of 5 windows

1st window has 4

1.2 Module for temperature control mod. FLTP-B/EV

Has Conditioner on the left

Question

Which kind of thermocouples do you know?

http://digital.ni.com/public.nsf/allkb/29FC44A9C662D80186256B02008387CF

For FLTP Conditioner
Thermocouple J
STT – Smart Temp. Transmitter
NTC – Negative

1.2.1 Module for temperature control mod. FLTP-B/EV

Has Conditioner on the left

Question.

What is amplifier?

1.2.2 Amplifier (Brief explanation)

Amplifier – modulates the output stronger than

1.3. Flow Rate- Level Control (FLTP-C/EV)

Has 2 conditioners, 1 amplifier and

1.3.1 Flow Rate Control

Measures the flow rate with a paddle wheel
Unit

1.3.2 Level Control

Shows the level of the tank
Measured with piezometric sensor

1.4 Pressure Unit (FLTP-D/EV)

Has signal conditioner and amplifier
Pressure is measured in

1.5. External Unit (FLTP-U/EV)

Has plexiglass panel
Has 3 tanks:
1) 25litres stainless

1.5. External Unit (FLTP-U/EV)

Piezometric Level Sensor

1.5. External Unit (FLTP-U/EV)

Thermostat (0-50C)

1.5. External Unit (FLTP-U/EV)

On/ Off Exhaust Solenoid Valve

1.5. External Unit (FLTP-U/EV)

Pressure Switch

1.5. External Unit (FLTP-U/EV)

PVC Proportional Valve

1.5. External Unit (FLTP-U/EV)

Paddle Wheel Flow meter

Paddle wheel flow measurement

Has a magnet in one of the paddles
Hall

1.5. External Unit (FLTP-U/EV)

PVD Proportional Valve

1.5. External Unit (FLTP-U/EV)

Temperature Sensors

1.5. External Unit (FLTP-U/EV)

PVC Proportional Valve

PVD Proportional Valve

Pressure Switch

Thermostat (0-50C)

Piezometric Level

9____________________

8_____________________

11________________

6)_________________

2)______________________

5___________________________

10______________________

1)____________

3)_________________

4)____________

7_____________________

12________________

Valves

Positive crankcase ventilation (PVC) is used to limit the pressure or

1.5 Work Principle of External Unit.

Liquid is kept in the

2. Control Units

PLC Trainer
Industrial PID
Control Card

2.1 PLC Trainer (PLC-5A/EV) Учебная панель

Has 16 digital inputs
14 digital outputs
4 Analog

2.2 PID Controller

Has inputs
Outputs

Control Card (MFI-U/EV)

Has 8Digital Inputs;
8Digital Outputs
16 Analog inputs
2 Analog Outputs

3 Control Techniques

PID Control

Amplifier

Heater

Transducer

Signal Conditioner

Set-Point

Question. Is it open loop or closed loop control?

PID Control

Amplifier

Heater

Transducer

Signal Conditioner

Set-Point

Feedback

Answer: It is closed loop control because of PID Control and feedback

PID

Open Loop Control

Signal Conditioner

Question

What are the transducers?

3 Transducers

Converter from physical variable to the electrical variable.
Example: Pressure

Question

What is the Conditioner?

Conditioner

Converter from undesirable electrical variable into suitable electrical variable
Always comes with

Temperature Control

PID Control

Amplifier

Heater

Transducer

Signal Conditioner

Set-Point

PV

Pressure Control

PID Control

Amplifier

Pump

Transducer

Signal Conditioner

Set-Point

PV