GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions
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Flux Curve
The Flux Curve describes the relationship between the induction motor voltage and
current. Specifical ly, each point of the curve specifies the voltage that is measur ed at
the motor terminals for a particular excitation curr ent, under no load conditions at the
nameplate frequency.
Function configuration
The Flux Curve consists of five voltage and current points. Two parameters are
associated with each point. The following table lists the parameters that configure the
Flux Curve.
Parameter Description
Flux curve voltage 1 No load voltage for data point 1. RMS volts
Flux curve voltage 2 No load voltage for data point 2. RMS volts
Flux curve voltage 3 No load voltage for data point 3. RMS volts
Flux curve voltage 4 No load voltage for data point 4. RMS volts
Flux curve voltage 5 No load voltage for data point 5. RMS volts
Flux curve amps 1 No load current for data point 1. RMS amps
Flux curve amps 2 No load current for data point 2. RMS amps
Flux curve amps 3 No load current for data point 3. RMS amps
Flux curve amps 4 No load current for data point 4. RMS amps
Flux curve amps 5 No load current for data point 5. RMS amps
The parameters listed above specify the curve if they conta in meaningful values. If
all the parameters ar e set to <No Value>, then the control uses th e curve measured
during Motor Control Tuneup.
Function description
Often the motor data sheet contains four or five voltage an d current measurements
that specify the Flux C urve. The voltage points are generally labeled "VNL" and the
current points "IN L".
If five data points are ava ilable on the motor data sheet, th ey can be entered directly
into the configuration parameters. Flux curve voltage 1 and Flux curve amps 1
represent the small est voltage and current, and Flux curve voltage 5 and Flux curve
amps 5 represent the largest volta ge and current.
If fewer than five data poin ts are available on the motor data sh eet, the highest data
points should contain meaningful values and the lowest data points should be set to
<No Value>. To reset one of the parameters to <No Value>, highlight the value and
press the Delete key.
If the curve data is not available, all the configuration parameters should be set to
<No Value>, and the Flux Cu rve should be determined usin g the Motor Control
Tuneup.