VFD Application Core Selection Guide

VFD Application Core Selection Guide

VFD Application Guide

CoolBLUE® cores per horsepower and cable length

CoolBLUE® CBO43HP1/4-50A4 CBO43HP1/4-50A4 CBO68HP51-100A6 CBO123HP101-428A12 CBO166HP429-1631A16 CBO326HP1632+A23
Power Range (hp) *1/4-10
(Use with NaLA®)
11-50
(Use with NaLA®)
51-100 101-428 429-1631 1632+
Cable Length # Cores # Cores # Cores # Cores # Cores # Cores
150ft/50m 2 4 4 4 4 4
300ft/100m 4 4 4 4 4 4
450ft/150m 6 6 6 6 6 6
900ft/300m 8 8 8 8 8 8

Note 1 – CoolBLUE normal operation is below 158°F/70°C.  It is important to use the correct number of cores to avoid saturation.
*Note 2 – On motors up to 10hp, two turns are needed through the cores (pass cable through cores twice).
Note 3 – Data above is for information and guideline purposes.  Please contact MH&W Engineering for detailed information.
Note 4 – Round and oval shaped cores are for ease of installation and mechanical functionality. Round and oval cores have same basic electrical absorption.
Note 5– Cores must be installed on the load side of the drive only.  If possible, installing cores in a drive cabinet is preferred.
Note 6 – Do not place conductive wires through the cores for holding cores in place.  MH&W offers brackets, and cable ties to hold cores in place.

NaLA® cores per horsepower and cable length

In applications where high reliability is needed, or 10hp motors and below, the use of NaLA® differential mode line absorber is necessary.  The use of NaLA® increases the reliability of these systems by further reducing the noise and peak values.  These cores must be placed around each individual cable.

NaLA® Part number  N18HP1/4-10 N18HP11-40 N29HP41-102 N57HP103-428 N75HP429-1631 N123HP1632+
Power Range (hp) 1/4-10 11-40 41-102 103-428 429-1631 over 1631
Cable Length # Cores # Cores # Cores # Cores # Cores # Cores
150ft/50m 2 1 1 1 1 1
300ft/100m 3 2 2 2 2 2
450ft/150m 4 3 3 3 3 3
900ft/300m 5 4 4 4 4 4

It is important to use the correct number of cores to prevent the cores from getting too hot.