Understanding VFD Variable Frequency Drive
Practical Demonstration of VFD Delta- M Series 1.5 KW I/P: 230V 1/3 Phase O/P: 230 3 Phase
VFD Status Screen Motor OFF Command Freq. Parameters Direction Amperes Output Freq.
Freq. Display Keypad Control Terminals POT Extended Terminal Blocks
Control Terminals Relay Feedback Terminals Freq. Feedback Analog Voltage Input Analog Current Input
Motor Brake Terminals Motor Output Terminals
3 Phase/ 1 Phase 220 VAC
Source of Frequency Command Master frequency determined by digital keypad Master frequency determined by 0 to +10 V input on AVI terminal Master frequency determined by 4 to 20mA input on ACI terminal Master Frequency Determined by Rs 485 Comm. port Master frequency determined by potentiometer on digital keypad
Source of Frequency Command Master frequency determined by digital keypad Frequency Increment Frequency Decrement
Source of Frequency Command Master frequency determined by 0 to +10 V input on AVI terminal
Source of Frequency Command Master frequency determined by 4 to 20mA input on ACI terminal
Source of Frequency Command Master frequency determined by Rs 485 Comm. port
Source of Frequency Command Master frequency determined by potentiometer on digital keypad
Source of Operation Command Operation determined by digital keypad Operation determined by external control terminals, keypad STOP is effective Operation determined by external control terminals, keypad STOP is ineffective Operation determined by RS 485 Comm. port, keypad STOP is effective Operation determined by RS 485 Comm. port, keypad STOP is ineffective
Source of Operation Command Operation determined by digital keypad VFD STOP VFD RUNNING RUN STOP
Source of Operation Command Operation determined by external control terminals, keypad STOP is effective
Source of Operation Command Operation determined by external control terminals, keypad STOP is ineffective
Source of Operation Command Operation determined by external control terminals, keypad STOP is effective
Operation Control of VFD 2 Wire Control (1) On/Off & Direction from Toggle Button
Operation Control of VFD 2 Wire Control (2) On/Off & Direction from Toggle Button
Operation Control of VFD 3 Wire Control On/Off from Push Button & Toggle Button for Direction Control
Source of Operation Command Operation determined by RS 485 Comm. port, keypad STOP is effective
Source of Operation Command Operation determined by RS 485 Comm. port, keypad STOP is ineffective
STOP Method Ramp Stop Coast Stop
Maximum Output Frequency Range 0 ~ 400 Hz
Acc./ Dec. Time Voltage / Frequency Setting for various Applications
Jog Frequency To adjust the Speed of Motor at Jog Mode Jog Acc./ Dec Time 0.1 to 600.0 sec or 0.01 to 600.0 sec
Second Source of Frequency Command Keypad Up/Down AVI (0-10V) ACI (4-20mA) Keypad Potentiometer Reverse Operation Inhibition Parameter Lock PLC Operation Jog Acc./ Dec Time 0.1 to 600.0 sec or 0.01 to 600.0 sec
VFD Biasing Adjusting Voltage by Frequency Curves
www.automation.org VFD Biasing 1 Volt = 5 Hz 50 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 25 Hz 0 Hz 0 5V 10V
www.automation.org VFD Biasing 50 Hz 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 Bias Adjustment 25 Hz 10 Hz 0 Hz 0 5V 10V Bias Adjustment = (Bias Range)/(Full range) x 100 = 10/50 x 100 = 20%
VFD Biasing www.automation.org 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 Bias Adjustment 50 Hz 25 Hz 10 Hz 0 Hz -2.5V Pot. Freq Gain 0 5V 10V 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
www.automation.org VFD Biasing Pot. Freq Gain = (Full voltage Range)/ (Effective Voltage Range) x 100 50 Hz 25 Hz 0 Hz 0 5V Pot. Freq Gain 10V 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 1 Volt = 5 Hz
VFD Biasing www.automation.org 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 Bias Adjustment 50 Hz 15 Hz 4.28 Pot. Freq Gain 0 5V 10V 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
www.automation.org VFD Biasing Bias Adjustment = (Bias Voltage Range)/(Full Voltage range) x 100 = 1/10 x 100 = 10% 50 Hz 45 Hz 25 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 0 Hz 0 1 5V 10V Bias Adjustment
VFD Biasing Pot. Freq Gain www.automation.org Bias Adjustment = (Bias Voltage Range)/(Full Voltage range) x 100 = 1/10 x 100 = 10% 50 Hz 25 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 0 Hz Bias Adjustment 0 5V 10V Pot. Freq Gain = (Full voltage Range)/ (Effective Voltage Range) x 100
www.automation.org VFD Biasing 50 Hz 25 Hz Fwd Bias Adjustment = (Bias Voltage Range)/(Full Voltage range) x 100 = 5/10 x 100 = 50% 2.5V 0 Hz 0 5V 7.5V 10V Pr.03= 50Hz--Max. output Freq. Rev 25 Hz Pr.48= 50%--bias adjustment Pr.49= 1 -- bias polarity Pr.50= 200% -- pot. freq. gain 50 Hz Pr.51= 1 -- REV disable in negative bias Pot. Freq Gain = (Full voltage Range)/ (Effective Voltage Range) x 100
www.automation.org VFD Biasing Bias Adjustment = (Bias Voltage Range)/(Full Voltage range) x 100 = 10/10 x 100 = 100% 50 Hz 25 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 0 Hz 0 5V 10V
Analog Output Signal Analog Frequency Meter (0 to Maximum Output Frequency) Analog Current Meter (0 to 250% of the rated AC drive current) Analog Output Gain 0 ~ 200%
Over Voltage Stall Prevention Over-Current Stall Prevention during Acceleration
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