Originally Posted by
Wood768dGuy
The VFD is programmed to 400 Hz max. PD005 = 400 sets the max frequency the VFD will output. The VFD never drives higher than 400 Hz.
PD072 and PD073 program the curve the selected signal (in my case 0-10V, PD070=0) the VFD uses to calculate desired output frequency from the 0-10V signal. If that calculation yields a value higher than 400Hz, the VFD will only output 400 Hz.
On your note about PWM frequency - I don't see how that would varying PWM frequency would have any affect on anything, since PWM, by definition, has a fixed frequency. If it's a variable frequency signal, then it is not a PWM signal.