what is the need for input and output chokes in variable speed drives
any criterial for choosing these
ram
Ac /dc Choke
Started by ram14375, May 06 2008 01:33 PM
1 reply to this topic
#1
ram14375
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Posted 06 May 2008 - 01:33 PM
hello everybody
what is the need for input and output chokes in variable speed drives
any criterial for choosing these
ram
what is the need for input and output chokes in variable speed drives
any criterial for choosing these
ram
#2
marke
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Posted 06 May 2008 - 07:05 PM
Hello ram
Input chokes add a reactive impedance to the supply as seen by the VFD and thereby limit any peak currents. This has the effect of reducing the potential for damage when there are transients on the supply, plus reducing the harmonic content of the current drawn from the supply, plus it helps to balance up the currents on the three phases.
Output chokes limit the rate of rise of current on the output and reduce the losses in the VFD when there is a high capacitance (long cables) on the output of the VFD.
Best regards,
Input chokes add a reactive impedance to the supply as seen by the VFD and thereby limit any peak currents. This has the effect of reducing the potential for damage when there are transients on the supply, plus reducing the harmonic content of the current drawn from the supply, plus it helps to balance up the currents on the three phases.
Output chokes limit the rate of rise of current on the output and reduce the losses in the VFD when there is a high capacitance (long cables) on the output of the VFD.
Best regards,
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