1800 RPM otors versus 3600 RPM
1800 RPM otors versus 3600 RPM
(OP)
Hi guys,
I have a 150HP motor being controlled with a 200 HP VFD. The motor is rated for 3600 RPM. The client now wants to go with a 200 HP motor. Will the VFD need to be increased as well? I know the current ratings of VFD's are based on 4 pole 1800 RPM motors. How does having a 3600 RPM motor affect this?
Thanks for the insight.
I have a 150HP motor being controlled with a 200 HP VFD. The motor is rated for 3600 RPM. The client now wants to go with a 200 HP motor. Will the VFD need to be increased as well? I know the current ratings of VFD's are based on 4 pole 1800 RPM motors. How does having a 3600 RPM motor affect this?
Thanks for the insight.





RE: 1800 RPM otors versus 3600 RPM
It should not be difficult to find a new 200 HP inverter duty motor that is suitable for use with an existing 200 HP VFD.
RE: 1800 RPM otors versus 3600 RPM
http:/
RE: 1800 RPM otors versus 3600 RPM
You should determine why the client wants to go to a larger motor and check to see if both the continuous and intermittant capacity of the VFD will be adequate to provide the expected performance.
RE: 1800 RPM otors versus 3600 RPM
For example, your motor nameplate says 220 amps. The drive continuous rating at 10% overload for one minute is 230 amps. The drive 5 second rating is 265amps.
The system will be able to operate at 230/220 of motor nameplate continuous, at (230+23)/220 for 10 seconds, and at 265/220 for 5 seconds. All of this assumes the motor stays within its thermal limits as well.
Hope that clears things up.