Motor Rotation
Motor Rotation
(OP)
Usually I swap any two leads to correct a motor rotation issue during start up process.
In the case of a VFD I can only do this correction between the VFD and the motor, is this correct.
In the case of a VFD I can only do this correction between the VFD and the motor, is this correct.






RE: Motor Rotation
RE: Motor Rotation
Some drives have this feature built in so no cable swapping would be necessary.
RE: Motor Rotation
in your VFD you can activate the reverse key
or you can have a switch to change direction for you
RE: Motor Rotation
RE: Motor Rotation
RE: Motor Rotation
I too would have brought up davidbeach's comment had he not beat me to it. I can't tell you how many trouble calls I have fielded because the user swapped the VFD output leads, but then the motor ran backwards when the bypass contactor was turned on! If you drive has them, you need to swap both the VFD output AND the line input cables. As gordonl said, the VFD does not know or care, but the bypass contactor does.
"Venditori de oleum-vipera non vigere excordis populi"
RE: Motor Rotation
sorry, jraef you were a mite late.
RE: Motor Rotation
Many VFDs have AC-DC-AC conversion that mandates it. In some AC-AC power electronic converters without the bypass switch, it would be possible to interchange the input leads.
RE: Motor Rotation
" In some AC-AC power electronic converters without the bypass switch, it would be possible to interchange the input leads." If by "power converter" you mean a current source inverter, I agree, but don't think that enough of those are still sold new to risk the possible confusion. 99.99999% of inverters sold now are PWM, and swaping input leads will do nothing for the motor.
"Venditori de oleum-vipera non vigere excordis populi"