Power Point Presentation of Automatics Division

7/28/2019 Power Point Presentation of Automatics Division

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WELCOMES YOU ALL


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WHAT IS AN ACTUATOR One who actuates, or puts into action.

A mechanism that puts something into automatic action

Actuators are special gears driven by electric motor. Actuators are used for remote operation for Shut Off /

Regulating valves or Dampers.

Can be equipped with switching / signaling devices, for

protection, interlocking and indication purposes.


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WHY AN ACTUATOR ? When the valve to be operated is very big.

Operating time is long

Operation is frequent.

Process linked.


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FUNCTIONS OF AN ACTUATOR

Actuators play an important role in automation

of process controls in industries.

Actuators are required to regulate flow,

velocity,draft or pressure of the process fluids.

The type of actuators depends on the power to

vary the orifice area in the valve body.


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CLASSIFICATION

Rotary / Linear actuator.

Part turn / Multi turn

Regulating / Non-regulating

Intelligent / Self Controlled / Normal.


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SELECTION OF ACTUATOR

TORQUE REQUIRED TO OPERATE THEVALVE

REGULATING / ON OFF DUTY

OPERATING TIME

STROKE LENGTH

PITCH DIAMETER

TYPE OF COUPLING

TYPE OF MEDIUM TO BE CONTROLLED


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ELECTRIC, PNEUMATIC & HYDRAULIC

ACTUATORSA COMPARISON

ELECTRIC PNEUMATIC HYDRAULIC

1) Economic

2) Simple Control

3) Reliable for Shortperiod Operation

4) Easy to install

5) Easy to maintain

6) Tight shutoff

1) Precise

Positioning

Fast Control

2) Easily

integrated to

control system

3) Basically

Linear

4) Lack in

Stiffness

5) Lack in

reliability

1) Stiff

2) Slow in

response

3) Complex

4) Require

additional

system

5) Difficult to

maintain

6) Linear

characteristic


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Actuators are used in: Power Generating stations

Steel, cement and glass industries

Pipe lines for transport of crude oil,natural gas or water

Air conditioning units

Food industries Any Process Industries which requires

automation of process control.


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ELECTRICAL PARTS OF ACTUATORS

Motors

Torque and Limit Switches

Terminals and Wiring


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MOTOR

Electric Actuators are equipped withsurface cooled, squirrel cage inductionmotors.

1 Phase or 3 phase motors or DC Motors

Class F insulated

S2 15 min - ON/OFF duty

S4 / S5 25% -1200 cycles / hour rated,

Modulating duty. Actuator motors are short time rated; as

the high inertia of continuously ratedmotors will inevitably damage the valves.


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MOTORS


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Motor Protection Athermistorembedded in the

windings shall directly sense motor

temperature and protect againstoverheating.

BMRBiMetal Relays In Motor

Control Centre


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Limit Switches

Position Limit switches ensure valve

operation within allowable ranges

Position Limits should be set every

time, any work carried out in

actuator, coupling block or valve

which results in disturbance in

position setting.


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Limit Assembly


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Torque Switches

Torque switches protect the valve against overtorque.

Torque setting is done when the actuator iscommissioned first and it should not bedisturbed .

Once the torque switch has tripped in eitherdirection, it can only be reset by operation of theactuator electrically or manually in the oppositedirection.


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Torque Switches


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Terminals and Wiring

Internal wiring is tropical grade

insulated, standard cable and

each wire is number identified in

accordance with terminalnumbering.


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TERMINAL PLAN

ELEC/O&A/AUTOMATICS / TS-II

M

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24R Y B

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

OT CT OL-1

CL-1 OL-2 CL-2

POTWINDING

THERMOSWITCH

3~

TERMINAL PLAN FOR ACTUATORS

OT- Open torqueCT-Close torqueOL- Open limitCL- Close limitPOT-Potentiometer

46 47 48

The switch position corresponds to valve in mid position

OL2- Auxiliary Open L/SCL2- Auxiliary Close L/S


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MECHANICAL PARTS

1. CENTRE COLUMN2. WORM SHAFT

3. WORM WHEEL4. LIMIT DRIVE SHAFT5. TORQUE SENSING MECHANISM

6. CLUTCH MECHANISM7. BASE ASSEMBLY8. DRIVE SLEEVE


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1. CENTRE COLUMN


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2 . WORM SHAFT


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WORM SHAFT


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3 . WORM WHEEL


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WORM WHEEL


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4 . TORQUE SENSINGMECHANISM


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TORQUE SENSING MECHANISM


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5 . CLUTCHMECHANISM


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CLUTCH MECHANISM


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6 . BASE ASSEMBLYOR

COUPLING BLOCK


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Output Drive Assembly


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TYPE A


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TYPE B,C,D,E


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DRIVE NUTSOR

STEM NUT

DRIVE SLEEVE


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DRIVE SLEEVE

DRIVE SLEEVE


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DRIVE SLEEVE


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FULLY ASSEMBLED ACTUATOR


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CONTROL SCHEME


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POWER CIRCUIT

CONTROL CIRCUIT


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CONTROL CIRCUIT

CONTROL CIRCUIT


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CONTROL CIRCUIT

21

OPEN COMMAND

(FROM UCB)

03 04 26 29 42 39201930

CLOSE COMMAND

(FROM UCB)

TO CVA PANEL

A B C D E F

COUPLING

RELAY

PANEL

VALVE IN OPERATION SWITCHGEAR

HEALTHY

POWER AND CONTROL CIRCUITTS II / ELEC/ O&A/AUTOMATICS PAGE : 1/1ENGLISH ELECTRIC MODULEMODIFIED

11.07.2006

05 06 07 08 13

9698

95 O/L

(N)

CLOSE

TEST

OPEN

TEST

R G

2P3

2P4

K2

0202

H10 H11

23

2P3

2P4

K1

A

B

K1

A

B

K2

1P1

1P2

K11P1

1P2

K2

09 19

A1

A2

K5

31

1507

01

17 0354

51

K5S37 1S13

1S14

S38 1S13

1S14Q

O/L

F1-F3

K1 K2

R

Y

B

R Y B

M

415/110V

T1

v1

v2

F10

X5

V1

V2

E21

E61

E25

E65

F57

F58

2A

2A 2AE20

E60

14

1716

15

90

N415 V, 3 ,4W, 50 Hz BUS

415 V TEST SUPPLY BUS

01 02

02

51 54

2P1

2P2

K2

2P1

2P2

K1

39

35

POWER

CIRCUITCONTROL

TRANSFORMER OLR

SUPERVISION

CONTACTOR

TEST PUSH

BUTTONS

OPEN

CONTACTOR

CLOSE

CONTACTORINDICATION CIRCUITS

( LOCAL )

SWITCH GEAR TROUBLE

INDICATION TO UCB

0202

01

01

02

4748

5960

K5

37

37

2427

4645

56

57

55

58

STAGE-2

DAMPERS


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LOGICDIAGRAMS

STAGE 1 LOGIC DIAGRAM


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PRE COMMISSIONING CHECK


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PRE COMMISSIONING CHECK

LIST

1.LIMIT SWITCH CHECK 2.TORQUE SWITCH CHECK

3.WINDING RESISTANCE & IR VALUE

OF THE MOTOR AND CABLE 4.CONTROL CABLE FEEDBACK TO

UCB

5.SWITCHGEAR HEALTHINESS ( OLR,

FUSES) 6.DELAY IN POWER CONTACTORS

ACTION

COMMISSIONING


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COMMISSIONING

1 . KEEP THE VALVE IN THE MIDDLE 2 . CHECK THE DOR RECEIVE COMMAND

FROM SWITCHGEAR

3 . CLOSE THE VALVE MANUALLY AND SETTHE CLOSE LIMIT.

4 . OPEN THE VALVE MANUALLY AND SETTHE OPEN LIMIT

5 . OPERATE THE VALVE FROM UCB. 6 . CHECK FOR LIMIT AND TORQUE SWITCHACTIONS IN BOTH THE DIRECTIONS, BY

ACTUATING THEM.

ACTUATOR


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ACTUATOR CRITERIA :

OUTPUT TORQUE : KG-M (or) NM

OUTPUT SPEED : RPM NORMAL OR REGULATING DUTY

OUTPUT TYPE : A,B,C,D,E

TORQUE : K . F

F- THRUST, K-Depends On Stem Dia,Stem Pitch

THRUST F : A.delta P.C+ E Kg

A- Cross Sec ,Area Of Valve Port Cm2

delta P . Max.Diff.Pressure Kg/Cm2 C .Valve Factor Depends on

Medium is liquid or Gas Medium Temperature

Type of Valve (Parallel Side/Wedge Gate/Globe)

E.Gland Friction Allowance Depends on Stem Diameter

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Power Point Presentation of Automatics Division