CT LOCATION

jeet2907

Dear all

Please suggest me where i have to put CT for measuring load(Ampere) in VFD feeder,input side or output side of the VFD and why?

Dear,

Normal CTs will not give correct readings if you mount them at the VFD output side.
There are special HALL EFFECT CTs for output current monitoring. More over, all standard VFDs have Analog output (4-20mA) programmable for output current to monitor remotely on a meter near motor or on DCS display etc. In additon to this, VFD display parameteres also show the ouput current.

Regards,
Vijay

Vithani

jeet2907

Dear all

Please suggest me where i have to put CT for measuring load(Ampere) in VFD feeder,input side or output side of the VFD and why?

I also want to add that, this will depend upon which current you required to monitor

If you want Output current, you need to mount CT at output side but remember Output current will not be pure sine wave

And if you want to monitor load from supply side, you need to install CT at input side

Both Current will be different - check Inverter input current is low than output for more study

Regards,
Devesh