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Member Since 13 Feb 2008
Offline Last Active Apr 21 2008 05:07 PM

Topics I've Started

Small Vs Large Vfd Controllar

21 April 2008 - 05:07 PM

hi ,
why it is perticularly stated that certain pwm controllar support upto say 2.2kW whereas the higher igbt can be connected using high rated drivers to the same controllar?

D/a Using 16f73

03 March 2008 - 05:59 PM

i m using 16f73 for my x-y table and position is sensed with linear potentiometer.
now to drive dc motor to control speed i need D/A converter without loosing much (eight) pins.
is it posssible to use A/D somehow to get D/A ?

Use Of Chock In Vsd

02 March 2008 - 02:50 PM

i usually find three phase chock coils at input of vsd
some new type comes with inbuit chock but when opened it there is no physical chock in it.
first of all why is chock needed and how it is eliminated in second version?

Output Cable Length

16 February 2008 - 05:42 PM

How does output cable length affect the performence of VFD?

Earth Leackage Protection In Vfd

13 February 2008 - 02:33 AM

Hellow !
being a new user pl overlook the violation of etikates if went wrong.

I built vfd 220volt, 750W. i ve provided earth leackage protection using differential CT.
When i turn on the motor at any speed it shows more than 50 volts leackage voltage with respect to ground.
the motor is tested for 2Kv insulation test. What can be the possible reasons?