Co2 progress and issues on the control system
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CO2 progress and issues on the control system. Lukasz Zwalinski – PH/DT 09.02.2009. Requirements for CO2 test stand. Requirements for test stand : 32 Analog Input s 4 Analog Output s 32 Digital Input s 32 Digital Output s SCADA system with long term logging.

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CO2 progress and issues on the control system

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Co2 progress and issues on the control system

CO2progress and issues on the control system

Lukasz Zwalinski – PH/DT

09.02.2009


Co2 progress and issues on the control system

Requirements for CO2 test stand

Requirements for test stand:

  • 32 Analog Inputs

  • 4 Analog Outputs

  • 32 Digital Inputs

  • 32 Digital Outputs

  • SCADA system with long term logging

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


There will be one pco with 3 option mode s driven by allowance table

Plant operation

CO2PCO

There will be one PCO with 3 option modes driven by allowance table

Switch between modes is executed manually by the operator request.

Start interlock: all requests are blocked when ON

SI1 – NO Option Mode Selected

Temporary Stop interlock: sends OFF request to the object when ON

TS1 – NO 24V PS01 Status OK; [10s delay]

Full Stop interlock: sends OFF request to the object & waits acknowledge when ON

FS1 – NO Process Stop Button OK OR NO Process Stop OK; [2s delay]

FS2 – HPC Pressure Switch Low =1 OR Pressure Switch High =1 [5s delay]

FS3 – Pump Thermal Switch TSL1101 [5s delay]

Configuration logic:

FeedBackON = True IF CO2 PCO (Run Order & One of the option modes selected)

FeedBackOFF = False IF NO CO2 PCO (Run Order & One of the option modes selected)

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


Co2 progress and issues on the control system

CO2PCO

Safety position

0

Start up request

Start up

1

T1

T0

Cool down request

Cool down loop

2

T2

T0

Cool down accumulator request

Cool down accumulator

3

T0

Plant operation

In option mode Stand-By we can distinguish stepper with 4 steps associated

Transition conditions:

T0 = Not Run Order OR Not Option Mode Stand-by

T1 = Run Order & Option Mode Stand-by

& liquid circulation is achieved Pump ON &FT1901 > xx

T2 = Run Order & Option Mode Stand-by &

TT1110 – 30C < TTsat(calculated from PT1104)

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


Co2 progress and issues on the control system

Dynamically calculated f(Rth)

0 ÷ 100 %

Analog Digital Object

High limit

PID

Out High limit

EH1104

PWM

MV

OutO

0÷100%

SP

Out Low limit

Low limit

0%

IF > 0 Then EH ON

ELSE OFF

IF < 0 Then CV ON

ELSE OFF

PT1103

Acc. Tsp

Psat(Tsp)

0%

Analog Object

Out High limit

High limit

PID

CV1104

MV

PWM

OutO

0÷100%

SP

Out Low limit

Low limit

Dynamically calculated f(sub-cool)

0 ÷ -100 %

Accumulator Control

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


Co2 progress and issues on the control system

Accumulator Control

Sub cooling:

Thermal resistance:

subcool = Tsat(PT1103) – TT1110

calculated every 5s

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


Co2 progress and issues on the control system

Interlocks

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


Co2 progress and issues on the control system

logic

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


Co2 progress and issues on the control system

2

3

5

6

4

1

Enthalpy (kJ/kg)

Enthalpy control

Øm = Qexperimet / (h5 - h4)

Qheater = (hrequested - h3) * Øm

Tsat = B / [ln(P)-A]-C A = 10.77 B = -1956 C = 271.04

  • It is not possible directly control the enthalpy in a PID loop.

  • The enthalpy must be derived from measured pressure and temperature and always be present in the

  • liquid phase which means that measured temperature should be at least 2C lower than calculated Tsat.

  • IF TT1103 -2C ≤ Tsat(PT1105) THEN enthalpy calculation ON

  • The enthalpy of point 3 can also be in the 2-phase area

  • The PLC is calculating enthalpy of a point 2 from measured temperature (TT1103) and pressure (PT1105).

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


Co2 progress and issues on the control system

UNICOS user interface

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


Co2 progress and issues on the control system

Software preparation

UNICOS project creation:1 – Exel specyfication preparation 2 – PLC hardware configuration3 – PLC & PVSS instance generation4 – Process logic programation5 – Code compilation 6 – Loadingto PLC7 – Commisionig & operation

Specyfication

SCADA server

Instance Generator

SIEMENS PLC

Logic Generator

All generated files will be kept in Subversion Version Control (SVN) service.

L.Zwalinski – PH/DTCO2 test stand control system 10.02.2010


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