Answer / kp

AC Drve operative for following features.
1.it is safty for motor.
2.energy saving.
3.Braking
4.costing/ramping.
5.easy to understant where is fauilure.
6.interlocking according to loop for Speed refrencr.
7.control V/F

Answer / stouhidee

At which the drive is use without any damage at its max.
efficiency.

whatis diference between zero pressure and obsolute pressure

1 Answers   ABB,

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We do have a problem in the company that is one PT connected to PlC which is mean 1 out of 1 in PLC system we do have the PAHH is 55 mbar and PALL 8 mbar with a timer of 15 sec for the PAHH the problem started when PAHH goes more than the set point which is 55 it reached up to 71 but due to timer doesn't trip . We force it and we checked everything nothing there . We replaced the transmitter problem still there the reading goes more than the 55 bar the range for transmitte is 0- 60 mbar . So we did loop check , aculaizing valve , wiring all are okay . What the possible causes for this ???

2 Answers   National Petrochemical Company,

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how magentic flow tx. vortex flow tx & ultrasonic flow tx works and its prinicle?its callibtration prosedure?

1 Answers  

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What is actuator what is motorized control valve?

5 Answers   Emco,

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There are two chlorination tonners both are connected to two pressure swithes and the pressure switch is connected to SOV which operates the valve to changeover the tonner selection i.e if pressure one tonner goes low the other tonner should come in line if it is inautomatic selection design a circuit using relays ?

0 Answers  

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In control valve proximity inductive sensor is taken as digital feedback for full open and full close.Normally its volts 24v when the sensor acts the feed back voltage 14v so that our relay not indicating in plc panel . kindly give the solution.

0 Answers  

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why we use 24v dc in instrument rahter than 230vac????

4 Answers  

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What is the SCAN time of a DCS/PLC? What is the typical value for scan time of DCS and PLC?

6 Answers   Essar, Gasco, Siemens,

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How to gennerate earth leakage monitoring alarm for solenoid valves in control system?

2 Answers  

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What are primary elements of measuring pressure? Which type of pressure can be measured by these elements?

0 Answers  

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all types instrumentation questions want

0 Answers   Bhel, Descon, HBL Power Systems,

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What is a PID controller and how can it to applied to our everyday life?

4 Answers  

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