VFD Application Guide

Core Selector

The “NEW” Core Selector allows selecting and requesting a quote for the correct number of cores for your VFD -Motor system even easier with a few simple clicks.

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Nanotech® Core Selector

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Common Mode Choke per Horsepower and Cable Length

MH&W Part #CBO43HP1/4-50A4CBO43HP1/4-50A4CBO68HP51-100A6CBO155HP101-428A12CBR166HP420-1631A16CBO326HP1632+A23
Power Range (hp)*1/4-1011-5051-100101-428429-16311632+
Cable Length **# Cores# Cores# Cores# Cores# Cores# Cores
150ft/50m244444
300ft/100m444444
450ft/150m666666
900ft/300m888888

Note 1 – Data above is for information/guideline purposes.
Note 2 – All cables/phases must travel through the Common Mode Chokes. Differential Mode Chokes are installed around each individual power cable, regardless of how many cables. Per application guide, Differential Mode Chokes are per cable. No ground or shielding through cores!
*Note 3 – On motors up to 10hp, two turns are needed through the Common Mode Chokes (pass cable through cores twice).
Note 4 – It is important to use the correct number and type of cores.
Note 5 – For servo and DC motors, please call MH&W Engineering.
Note 6 – Install cores on load side of drive for typical motor applications. Cores may be installed on the line side of VFD as well to reduce conductive and radiated emissions back to the power grid.
Note 7 – MH&W offers brackets, and cable ties to hold cores in place. Please call MH&W Engineering for alternative methods.

** Cable length between drive and motor must be multiplied by the number of cables per phase, to calculate the total cable length to be used in above guide for Common Mode Chokes. The actual length of each cable is used in the Differential Mode Chokes guide.
*** For cable runs over 950ft, contact MH&W Engineering.
Contact your local MH&W Engineer for detailed information.

Differential Mode Chokes per Horsepower and Cable Length

The use of Differential Mode Chokes increases the reliability of these systems by further reducing the noise and peak values. These cores must be placed around each individual cable.

MH&W Part #N18HP1/4-10N18HP11-40N29HP41-102N57HP103-428N75HP429-1631
N123HP1632+
Power Range (hp)1/4-1011-4041-102103-428429-16311632 and above
Cable Length# Cores# Cores# Cores# Cores# Cores# Cores
150ft/50m211111
300ft/100m322222
450ft/150m433333
900ft/300m544444
It is important to use the correct number of cores to prevent the cores from getting too hot.

Note 1 – Data above is for information/guideline purposes.
Note 2 – All cables/phases must travel through the Common Mode Chokes. Differential Mode Chokes are installed around each individual power cable, regardless of how many cables. Per application guide, Differential Mode Chokes are per cable. No ground or shielding through cores!
*Note 3 – On motors up to 10hp, two turns are needed through the Common Mode Chokes (pass cable through cores twice).
Note 4 – It is important to use the correct number and type of cores.
Note 5 – For servo and DC motors, please call MH&W Engineering.
Note 6 – Install cores on load side of drive for typical motor applications. Cores may be installed on the line side of VFD as well to reduce conductive and radiated emissions back to the power grid.
Note 7 – MH&W offers brackets, and cable ties to hold cores in place. Please call MH&W Engineering for alternative methods.

** Cable length between drive and motor must be multiplied by the number of cables per phase, to calculate the total cable length to be used in above guide for Common Mode Chokes. The actual length of each cable is used in the Differential Mode Chokes guide.
*** For cable runs over 950ft, contact MH&W Engineering.

Contact your local MH&W Engineer for detailed information.