Design :

The basic design of the Emtork Electric Actuator consists of an electric motor used as a prime mover and a gear box to reduce the speed & to increase the torque at the output end.
Various models have been developed to suit specific types of valves/dampers,process parameters, duty conditions etc. howeverthese have been developed on "Building block principle" by keeping the basic design common.
The basic actuator model i.e.'M0' and "M1" are the rotary models with an output torque of 8 kgm & 20 kgm respectively at various output speeds. For more output torque in rotary models, supplementary spur gearboxes are coupled to the basicactuators to make the models as M0/SG OR M1/SG.
For Quarterturn applications, the output speed of the basic M0& M1 models is reduced to 1 or 2 RPM. For higher torque ratings supplementary worm gear boxes are coupled to the basic actuators to ma e t e I models as M0/WG or M1 IWG.
For TMO / WG or TM l / WG models, foot mounting bracket & linkages are provided to make them suitable for damper operations.
The Linear actuators viz LM1& LM1 are developed by converting rotory movement into a linear one.
All the above models are available in Flame Proof Explosion proof versions, duly approved by CMRS Dhanbad for Gas Groups I, IIA, IIB & IIC, as per FS-2148.
All the above models are available for ON/OFF and Regulating duty applications.

Modes, Types & Models of Emtork Actuators :

Optional Features
• Electic motor- TESC,3ph,S2 OR S4 Duty
• Better class of insulation for motor
• Travel limits switches 2NO+2NC in place of 1NO+1NC-2 Nos
• Torque limits switch 2NO + 2NC in place of 1NO+1NC-2Nos
• Additional Travel limit switches (1NO + 1NC)-4Nos(Extra)
• Feed back potentiometer
• Remote position indicators-Analogue Digital Bar graph
• Space heater
• Electromagnetic brake for the motor
• Various types of local & remote panels
• Foot mounting brackets
• Set of Linkages
• Tailor made accessories to suit customer's specific requirements

Details of features of actuators

Drive Motor
Emtork actuator are equipped with three phase, squirrel cage induction motor having high starting torque, These motors comply with IS-325 specifications.

Supplycondition........................... 415 VAC, 3ph
Enclosure..................................... TEFC
Class of insulation....................... Std.'F'
Class of protection...................... IP55 / IP67
Duty............................................ Std. S1 / Optional S2 or S4
Ambient,temp............................. 45º C

Travel limit switches
These switches are provided to cut off the actuator supply at the end of the preset travel in either direction. These switches are operated by cams which can be reset at site.

Torque limit switches
These switches cut off the actuator supply in case the torque developed in the system is more than the desired preset value, in eitherdirection.
Every actuator is calibrated in the factory for the operating range of output torque by measuring it on the dynamometer. The reqd. operating torque can be reset at site by referring to the calibration chart fixed inside the cover of each unit.

Local indicator
A continuous type local position indicator is provided on the actuator to show the actual mechanical position of the final control element. As this works on gear mechanism it gives the indication irrespective of hand or electrical operation.

Handwheel with motor over-riding feature
Emtork actuator is provided with a handwheel for emergency manual operation. The selector fork lever when put on to 'Hand-position', disconnects the motor drive. When the motor is switched on, the hand wheel connection gets disenaaaed automatically.

Protection
The Emtork actuators are supplied with IP55/IP65/IP67/IP68 class of protection as per IS-4691 & IS2147 duly certified by CIL Banglore.

Output Shaft Designs
The basic rotary actuators are supplied with output shaft couplings types A,C,D, Easper DIN 3210. Similer output couplings can be given at the output end of the supplementary spur gear boxes. For supplementary worm gear boxes the output coupling will normally be type'E'.

Hammer Blow Effect
Sometimes it is necessary to provide a considerably higher starting torque to clear jammed valves. This is done by providing hammer blow effect which is an inbuilt feature of the 'Emtork' actuator and is achieved thru "Lost motion principle"

Feed back Potentiometer / Transmitter
A feed back signal, in terms of change in resistance or current proportional to the valve position, is available thru potentiometer or transmitter.

Remote indicators
The signal coming from potentiometer is converted thru stabilised power source and read by Analogue/Digital/ Bar graph meters.

Space heater
An anti-condensation heater can be provided in the switching compartment while using the actuator in humid/damp environment.

Brake
Electromagnetic brake can be provided on the motor to stop the actuator instantly

Control Panels
Various types of control panels can be provided for local, remote and combined local + remote operations of the actuator.

Positioner
Panel Actvator mounted Electronic Positioner can be supplied which can accept a control command of 420 MA and position the final control element accordingly, 4-20 MA feed back signal is also available from the Positioner.

Integral Starter Unit

D.1 This is a field based operating unit, with electronic control logic, mounted on the actuator itself, for the unit functions
      like Open-Stop-Close and Local-Off-Remote with the help of lockable switch can be from this unit. This units can
      operate between-20 C to 80 C

D.2 Three Position Switch / Push buttons are provided for Open-Stop-Close functions also Open-Close indications
      lamps/LED are provided for full Open/Full Close position

D.3 Coupled with the actuator the entire assembly conforms to weather proof standard IP67

D.3 Status annunciations LED, which are available,
      Actuator running in Open
      Actuator running in Close
      Actuator in Local operation
      Actuator in Remote operation
      Open limit switch tripping
      Close limit switch tripping
      Actuator in inching mode
      Actuator in self-retaining mode
      24VDC control colt availability for customer use

D.5 Electromechanically interlocked contactors of 230V, 1phase 50Hz AC are provided in the starter unit

D.6 The starter unit has the following field selectable options, on demand. Closing by torque or closing by travel Remote
      operation can be dome by inching/non inching mode

D.7 Potential free contacts ate available for
      Thermal Over Load Relay trip
      Torque switch trip
      Thermo switch trip
      Local-Off-Remote positions
      Annunciation of power failure

D.8 Time delay is introduced between tripping of torque switch in closing direction and torque switch in open direction

D.9 Potential free contacts are available for power failure annunciation

D.10 Automatic phase sequence corrector facility is available,

D.11 24VCD remote command signal (Open-Stop-Close) from DCS shall be opto-isolated from electronics

D.12 The following modes available through DIP switches & are field congifigurable:Inching or non-inching, Valve seating
        by close torque or close limit

D-13 Fault annunciation LED are available
        Torque Switch Open
        Torque Switch Close
        Thermo switch trip
        Thermal Over load Relay trip
        Motor Single phasing

D.14 It will be possible to reverse the direction of travel (in local & remote) without giving stop command is self retaining
        as well as non-self retaining mode.

The unit will have interchangeable PCB which will be split into different functional modules mounted on mother board for
easy interchangeablity, The basic actuator and starter unit will be with Plug in type connectors.

E Positioner

E.1 Positioner will accept 4-20A control signals and give an outpur of 230 VAC, 10A Up/ Down relay signals.

E.2 This unit will have an adjustable dead band from 0.75% to 3%

E.3 The unit will have a time delay adjusted between 0.3 to 20 Seconds.

E.4 The opsitioner can be field settable for failure of signals in following modes.
      Fail to Open
      Fail to Close
      Fail to Stay put position

F Position Transmitter

F.1 The two wire R/I converter accepts optentiometric input of 100 –235/0-500 Feedback and and converts it to 4-20mA

F.2 External power source from 12-36V DC will have to be connected

F.3 The Positioning accuracy will be less than + 1

F.4 The position transmitter is epoxy filled with IP66 protection

G Signal Isolator

G.1 The isolator an integral part of starter unit, this accepts 4-20mA and gives an Isolated output of 4-20mA

G.2 Zero & Span adjustments are provided for setting

G.2 Load (impedance of the unit will be 500 ohms

Ordering Specifications

I) Basic models with supplementary spur & worm gear boxes