Created Date: February 13,2008

Created by: milldrone

bauerct,

does the VFD care what the input frequency is?

In theory no. There may be under voltage issues although.

To do the 230 volt thing with a nominal 400 volt input you will need a drive capable of the 230 volt amperage of the motor. Ie. a 20 hp 480 volt drive.

Unfortunately there is no 120 hz setting in the GS2 or GS3 drives for parameter P0.02. So to get the voltage to be 230 volts at 60 hz you have to use the 400 hz setting.

P0.02 = 400 hz

P0.04 = 1800 rpm : note this may have to be 1801

P2.00 = 03 custom

P2.04 = 60 midpoint freq

P2.05 = 230 midpoint voltage

By the way most 480 volt 60 hz motors will run on 400 volt 50 hz. A VFD actually does this for you when the speed is at 50 hz, I t will shape the voltage to be 400 volts nominal, but the speed will be 5/6 of the 60 hz speed.

Vaughn

Created Date: February 13,2008

Created by: bauerct

We have a 10 HP 480/230 VAC 60 Hz motor that we would like to use in a system that has 380 VAC, 50 Hz available. I believe we can wire the motor for low voltage (230 VAC) and also limit the VFD output to match. This would take care of the voltage discrepancy keeping us from having to de-rate the motor but we are unsure how the line frequency (50Hz vs. 60Hz) would affect the torque/speed curve. Would it? If I set up the drive with the nameplate ratings of the motor, base speed = 1800 and base frequency = 60 Hz, does the VFD care what the input frequency is?