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# Delta VFD Biasing Methods

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This presentation explains specifically how to vary the gain & offset of VFD to make customize Voltage by Frequency curves

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### Delta VFD Biasing Methods

1. 1. www.nfiautomation.org Delta VFD Biasing M Series
2. 2. www.nfiautomation.org VFD Biasing 1 Volt = 5 Hz Pr.03=50Hz--Max. output Freq. Pr.48=0%--bias adjustment Pr.49=0 -- bias polarity Pr.50=100% -- pot. freq. gain Pr.51=0 -- REV disable in negative bias 50 Hz 25 Hz 0 Hz 0 5V 10V
3. 3. www.nfiautomation.org VFD Biasing 1 Volt = 5 Hz Pr.03= 50Hz--Max. output Freq. Pr.48= 20%--bias adjustment Pr.49= 0 -- bias polarity Pr.50= 100% -- pot. freq. gain Pr.51= 0 -- REV disable in negative bias 50 Hz Bias Adjustment = (Bias Range)/(Full range) x 100 = 10/50 x 100 = 20% 25 Hz Bias Adjustment 10 Hz 0 Hz 0 5V 10V
4. 4. www.nfiautomation.org VFD Biasing Bias Adjustment = (XV/ Full voltage Range) x 100 (Full Freq. Range – Bias Freq. range) / (Full voltage range) = (Bias Freq. – 0 Hz) / XV Pot. Freq Gain = (Full voltage Range)/ (Effective Voltage Range) x 100 Pot. Freq Gain 50 Hz Pr.03= 50Hz--Max. output Freq. Pr.48= 25%--bias adjustment Pr.49= 0 -- bias polarity Pr.50= 80% -- pot. freq. gain Pr.51= 0 -- REV disable in negative bias 25 Hz Bias Adjustment 10 Hz 0 Hz -2.5V 0 5V 10V
5. 5. www.nfiautomation.org VFD Biasing Pot. Freq Gain = (Full voltage Range)/ (Effective Voltage Range) x 100 50 Hz Pot. Freq Gain Pr.03= 50Hz--Max. output Freq. Pr.48= 0%--bias adjustment Pr.49= 0 -- bias polarity Pr.50= 200% -- pot. freq. gain Pr.51=0 -- REV disable in negative bias 25 Hz 0 Hz 0 5V 10V 1 Volt = 5 Hz
6. 6. www.nfiautomation.org VFD Biasing Bias Adjustment = (XV/ Full voltage Range) x 100 (Full Freq. Range – Bias Freq. range) / (Full voltage range) = (Bias Freq. – 0 Hz) / XV Pot. Freq Gain = (Full voltage Range)/ (Effective Voltage Range) x 100 Pot. Freq Gain 50 Hz Pr.03= 50Hz--Max. output Freq. Pr.48= 42.8 %bias adjustment Pr.49= 0 -- bias polarity Pr.50= 70 % pot. freq. gain Pr.51= 0 -- REV disable in negative bias Bias Adjustment 15 Hz 4.28 0 5V 10V
7. 7. www.nfiautomation.org VFD Biasing Bias Adjustment = (Bias Voltage Range)/(Full Voltage range) x 100 = 1/10 x 100 = 10% 50 Hz Pr.03= 50Hz--Max. output Freq. Pr.48= 10%--bias adjustment Pr.49= 1 -- bias polarity Pr.50= 100% -- pot. freq. gain Pr.51= 0 -- REV disable in negative bias 45 Hz 25 Hz 0 Hz 0 Bias Adjustment 1 5V 10V
8. 8. www.nfiautomation.org VFD Biasing Bias Adjustment = (Bias Voltage Range)/(Full Voltage range) x 100 = 1/10 x 100 = 10% Pot. Freq Gain 50 Hz Pr.03= 50Hz--Max. output Freq. Pr.48= ____ bias adjustment Pr.49= 1 -- bias polarity Pr.50= ____-- pot. freq. gain Pr.51= 0 -- REV disable in negative bias 25 Hz 0 Hz 0 Bias Adjustment 5V 10V Pot. Freq Gain = (Full voltage Range)/ (Effective Voltage Range) x 100
9. 9. www.nfiautomation.org VFD Biasing Bias Adjustment = (Bias Voltage Range)/(Full Voltage range) x 100 = 5/10 x 100 = 50% 50 Hz Fwd 25 Hz 2.5V 0 0 Hz 5V Rev 7.5V 10V 25 Hz 50 Hz Pot. Freq Gain = (Full voltage Range)/ (Effective Voltage Range) x 100 Pr.03= 50Hz--Max. output Freq. Pr.48= 50%--bias adjustment Pr.49= 1 -- bias polarity Pr.50= 200% -- pot. freq. gain Pr.51= 1 -- REV disable in negative bias
10. 10. www.nfiautomation.org VFD Biasing Bias Adjustment = (Bias Voltage Range)/(Full Voltage range) x 100 = 10/10 x 100 = 100% 50 Hz Pr.03=50Hz--Max. output Freq. Pr.48=100%--bias adjustment Pr.49=1 -- bias polarity Pr.50=100% -- pot. freq. gain Pr.51=1 -- REV disable in negative bias 25 Hz 0 Hz 0 5V 10V
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13. 13. Thanks www.nfiautomation.org nfi