10 | P a g e
VFD Setup
To setup your VFD you will need to know your spindle motor’s frequency. It is also helpful to know the
maximum current that your spindle motor should ever draw. You should be able to find both values on the
motor’s nameplate.
If you cannot locate the motor’s frequency, the name plate should tell you how many poles there are on the
motor. Using the motor’s maximum RPM and its number of poles, you can calculate the frequency with the
formula below.
Frequency = Max RPM * Number of Poles / 120
You are now ready to setup your VFD.
Standard Setup
Your VFD comes pre-programmed from MachMotion. The following parameters should never be changed.
Parameter # Description Default
73 Analog Input Selection 10
74 Input Filter Constant 6
You may, however, have to change the following parameters.
Parameter # Description Standard
Range
1 Maximum Frequency (If less than 120 Hz) Max Motor Frequency
0-120Hz
2 Minimum Frequency 0
0-120Hz
3 Frequency Motor Frequency
0-400Hz
7 Acceleration Time 1-3
0-3600 Sec
8 Deceleration Time 1-3
0-3600 Sec
9 Max Motor Current Rated VFD Current
0-500
18 Maximum Frequency (If greater than 120 Hz) Max Motor Frequency
120-400Hz
72 PWM Frequency Selection 10
0-15
125 Maximum Frequency Max Motor Frequency
0-400Hz
All the frequency parameters (1 or 18, 3, and 125) will be the same value unless your maximum frequency is
different from the frequency on the spindle motor’s nameplate. Only set parameter 1 if your max spindle
frequency is less than 120 Hz. Only set parameter 18 if your max spindle frequency is greater than 120Hz.
If your spindle motor does not mention a minimum frequency, leave parameter 2 at zero. Also, if you cannot
find your max motor current, just set parameter 9 to the rated VFD current.
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