NEMA Unbalance VI

Owning Palette: Motor VIs

Requires: Electrical Power Toolkit

Calculates the unbalance in compliance with NEMA MG 1-2014.

Details  Example

	voltage RMS values specifies the three-phase voltage RMS. The array size must be a multiple of three. If you have multiple motors, ensure that you specify the three-phase voltage RMS motor by motor. National Instruments recommends using the line-to-line voltage RMS in delta connections to calculate unbalance.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	unbalance returns the unbalance, as a percentage, of voltage RMS values. Each element corresponds to the results of the three phases for each motor.
	unbalance derating factors returns the value to derate the motor load for unbalance calculation. Each array element corresponds to the results of one three-phase motor. NEMA MG 1-2014 does not define how to derate the motor load when the unbalance is greater than 5%.
	error out contains error information. This output provides standard error out functionality.

NEMA Unbalance Details

Related Information
Delta Connections
Measuring Unbalance
Wiring

Example

Refer to the Motor Monitoring.lvproj in the labview\examples\Electrical Power\Motor Monitoring directory for an example of using the NEMA Unbalance VI.