Answer / sameer

AC drive speed control on basis speed=120F/P
F is frequency which is variable

Answer / manoj

ac drives control speed by frequency as well as by voltages
.

Answer / pawan

There are three parts in AC drive
1. Rectifier ckt
2. Regulator
3. Invertor ckt (IGBT used)
Using AC drive we can change the frequency of motor by
varying the frequency of input/supply voltage.

Answer / amitbamal

N=120F/P

Answer / sks

AC drives known as VFD(variable frequency drives) operate
differently from DC drives known as VSD(variable speed drives )
the most basic difference being that DC drives may have a
constant dutycycle( ON to On-Off ratio) on PWM signal but AC
drives must have a variable duty cycle throughout as they
are frequency based and can't be instantly increased or
stopped at min or max frequency.

Answer / patrice

It is a three phases speed controller
the variable frequency controller is used in the industry
especially on conveyors systems or rotating machines to
adjust the speed according to the flow of the production
It is a regulation of speed

why we connect digital multimeter in series for dc current measurement and parallel for dc voltage measurement.

4 Answers  

i have done DAE in Instrumentation and Process Control. i have applied for an apprentice training in chemical company after three day my interview will be conduct but i need more information about industrial process control and controller. my e mail is imran_dilsetu@yahoo.com please tell me interview question relative to instrumentation ?

0 Answers  

god evening sir i am studying m.sc(tech)electronics &instrumention.am i elegible to all industies

0 Answers  

Give 2 application of quartz crystal used for process parameter measurement.

1 Answers   ADMA OPCO,

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1 Answers  

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1 Answers  

how to connect 3 wire 4-20 mA transmitter in Plc system PLC system and how explain how the measuring data communicate with plc system.

1 Answers  

Qatar fertilizer call me for interview as Instrumentation Project Engineer. Please let me know what kind of question they asked ? ALso they said they will take Written test, any idea about this written test ?

1 Answers   QAFCO,

While giving Power Supply of 24 VDC to a Transmitter,why Shield Terminal is connected either at Transmitter or at ISB.Why not Shield Terminal connected at both ends.If the Reason is to avoid Noise interference,which type of noice that is interfering.Is the Noice from the 24 VDC supply terminals or from any external source.

1 Answers  

if a tank is contaning oil and water than how can we measure the oil and water level seperately

3 Answers  

The DCS stand for________________________. it is composed of the following major components: a:______________ b:______________ c:______________ d:______________

2 Answers  

can anybody tel me how a vfd or any field instrument communicates/interface with plc/scada/cs.

0 Answers   Honeywell,