Curious about something:
Say you have a VFD that is designed for a line voltage of 200-240AC, 3PH. At 240V, the DC bus voltage will obviously be higher than at 200V, and therefore the output pulses will be a higher voltage.
My question is- does the VFD compensate for this change in DC bus voltage, and adjust the PWM duty cycle? Or does it assume it always has the same bus voltage, as if it were running full load with a line voltage of say, 220V?
The VFD in question is an AB PowerFlex 523, but I'm curious if this applies to VFDs in general.
Thanks!
Say you have a VFD that is designed for a line voltage of 200-240AC, 3PH. At 240V, the DC bus voltage will obviously be higher than at 200V, and therefore the output pulses will be a higher voltage.
My question is- does the VFD compensate for this change in DC bus voltage, and adjust the PWM duty cycle? Or does it assume it always has the same bus voltage, as if it were running full load with a line voltage of say, 220V?
The VFD in question is an AB PowerFlex 523, but I'm curious if this applies to VFDs in general.
Thanks!