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mukesh.dic2005
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Join Date: Mar 2012
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What is Difference Between Input Chock and Output Chock?

03/28/2012 1:30 AM

Dear All,

Please suggest me what is the different between Input and Output chock of VFD?

I still confuse because of input frequency is 50Hz and output frequency is PWM.

Please give us suggestion how to calculate impedance and Time constant of Output and Input chock.

Thanks & regards,

Mukesh Dadhaniya

(Sr. Engineer)
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lyn
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#1

Re: What is difference between Input chock and output chock?

03/28/2012 1:43 AM

Don't you mean choke?
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mukesh.dic2005
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#3
In reply to #1

Re: What is difference between Input chock and output chock?

03/28/2012 3:23 AM

yes, Chock connected between Drive(VFD) and Motor. any one have idea ?
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PWSlack
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#4
In reply to #3

Re: What is difference between Input chock and output chock?

03/28/2012 4:58 AM

Yep #2↓.

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PWSlack
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#2

Re: What is difference between Input chock and output chock?

03/28/2012 3:14 AM

Proprietary CE-marked VFDs come with these components correctly selected. There is no need to worry or be confused about them, as someone else has already done just that and eliminated the confusion.

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electricalexpert65
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#5

Re: What is Difference Between Input Chock and Output Chock?

03/28/2012 11:34 AM

Input choke in a VFD is to avoid the harmonics generated by the VFD from flowing back to the grid (you see! a choke is an inductor, which would offer high impedance for the high frequency harmonics). It is also possible to prevent external harmonics from flowing into the VFD and corrupting it.

Whereas the output choke between a VFD output and the motor is to compensate for the long cable capacitance, thus preventing any damage to the motor due to the reflecting wave phenomenon.
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PWSlack
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#6

Re: What is Difference Between Input Chock and Output Chock?

10/20/2023 7:16 AM

These yellow things are <...chock[s]...>:

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SolarEagle
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#7

Re: What is Difference Between Input Chock and Output Chock?

10/20/2023 8:44 AM

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SolarEagle
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#8
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Re: What is Difference Between Input Chock and Output Chock?

10/20/2023 11:55 AM

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SolarEagle
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#9
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Re: What is Difference Between Input Chock and Output Chock?

10/20/2023 12:36 PM

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electricalexpert65 (1); lyn (1); mukesh.dic2005 (1); PWSlack (3); SolarEagle (3)

Previous in Forum: Effect of 380 & 400 Volt Motor on 415 Volt Supply   Next in Forum: ACSD Test for Nonuniform Insulated Transformer

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