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Understanding
“VFD”
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Allen Bradley Power Flex 4M
Variable Frequency Drive
Practical
Demonstration of
VFD
Powerflex- 4M
0.4 KW= 0.5 Hp
I/P: 230V 1/3 Phase
O/P: 230 3 Phase
Motor Speed Directly Proportional to
Frequency
Motor RPM= (120*F)/P
Maximum Output Frequency Range
0 ~ 400 Hz
Motor
RUN/Stop
Indication
Command Freq.
Parameters
Direction
Volts reading
Fault
VFD Status ScreenAmperes
Indicates freq.
Control by VFD POT
Indicates Operation.
Control by Keypad
RUN VFD
STOP VFD
Change
DirectionKeys to
Read/Write
Parameters
Control Terminals
Relay Feedback
Terminals
Freq. Feedback
(0 ~ 10 V)
(0 ~ 50Hz)
Analog Voltage
Input (0 ~ 10V)
Analog Current
Input (4 ~ 20mA)
Motor Output
Terminals
3 Phase/ 1 Phase
220 VAC
VFD Wiring Diagram
Power Flex 4M
Parameters to be used in
this Course
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Reset the Drive & EnterStart-up Parameters
How to?
Programming the VFD
AB Powerflex 4M
Step 1:
Reset the Drive to Factory Setting
Parameter:
P112 – Reset to DefaultResets all parameter values to factory defaults.
Step 2: Enter Motor related Parameters
AB Powerflex 4M
P101 – Motor NP VoltageStop drive before changing this parameter.Set to the motor nameplate rated voltage.
P102 – Motor NP HertzStop drive before changing this parameter.Set to the motor nameplate rated frequency.
P103 – Motor OL CurrentSet to the maximum allowable motor current.
P104 – Minimum FrequencySets the lowest frequency the drive will output continuously. Min/Max: 0.0/400.0 Hz
P105 – Maximum FrequencySets the highest frequency the drive will output continuously. Min/Max: 0.0/400.0 Hz
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Source of Operation
Keypad
AB Powerflex 4M
P106 – Start SourceStop drive before changing this parameter.Sets the control scheme used to start the drive.
Source of Operation
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Source of Operation
3 Wire
AB Powerflex 4M
P106 – Start SourceStop drive before changing this parameter.Sets the control scheme used to start the drive.
Source of Operation
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Source of Operation
2 Wire
AB Powerflex 4M
P106 – Start SourceStop drive before changing this parameter.Sets the control scheme used to start the drive.
Source of Operation
AB Powerflex 4M
P107 – Stop ModeActive stop mode for all stop sources
0“Ramp, CF”(1) (Default)
Ramp to Stop. “Stop” command clears
active fault.
1“Coast, CF”(1)
Coast to Stop. “Stop” command clears
active fault.
Stop Method
P110 – Dec. Time
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Source of Speed
Drive Pot
Parameter Organization - Program
AB Powerflex 4M
P108 – Speed ReferenceSets the source of the speed reference to the drive.
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Source of Speed
Internal Freq.
Parameter Organization - Program
AB Powerflex 4M
P108 – Speed ReferenceSets the source of the speed reference to the drive.
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Source of Speed
0 ~ 10 VIN
Parameter Organization - Program
AB Powerflex 4M
P108 – Speed ReferenceSets the source of the speed reference to the drive.
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Source of Speed
Preset Freq.
Parameter Organization - Program
AB Powerflex 4M
P108 – Speed ReferenceSets the source of the speed reference to the drive.
DIN 2 DIN 1 Speed Parameter Speed (in Hz)
0 0 A410 10 Hz
0 1 A411 5 Hz
1 0 A412 15 Hz
1 1 A413 20Hz
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Acc./Dec. Time
AB Powerflex 4M
P110 – Dec. TimeSets the rate of deceleration for all speed decreases.
P109– Acc. TimeSets the rate of deceleration for all speed decreases.
Acc./ Dec.
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Acc./Dec. Time 2
AB Powerflex 4M
P110 – Dec. TimeSets the rate of deceleration (0.1 ~ 600secs).
P109– Acc. TimeSets the rate of acceleration (0 ~ 600secs).
Acc./ Dec. 2Default Acc./Dec. Time Acc./Dec. Time 2
A401– Acc. Time 2Sets the rate of acceleration (0 ~ 600secs).
A402 – Dec. TimeSets the rate of deceleration. (0.1 ~ 600secs)
T201/T202 – DIN FunctionEnter 1 for Acc./Dec. Time 2
Step 1- Enter the Time
Step 2- Assign the Function
Step 3- Energize DIN 1/DIN 2
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JOG Mode
Jog/Inch FrequencyTo adjust the Speed of Motor at Jog Mode
Jog Acc./ Dec Time0.1 to 600.0 sec or 0.01 to 600.0 sec
AB Powerflex 4M
T201/T202– DIN FunctionEnter 2 for Jog Mode
Step 2- Assign the Function
Step 3- Energize DIN 1/DIN 2
A404- Jog Freq.A405- Jog Acc./Dec. Time
Step 1- Enter the Jog Freq., Acc./Dec. Time
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LocalControl
Local ControlWhen active, sets integral keypad as start source and potentiometer on
the integral keypad as speed source
AB Powerflex 4M
T201/T202 – DIN FunctionEnter 5 for Local Operation
Step 1- Assign the Function
Step 2- Energize DIN 1/DIN 2
Operation Source
Speed Source
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AuxFault
Aux Fault- NCWhen enabled, an F2 Auxiliary Input fault will occur when the input is
removed.
AB Powerflex 4M
T201 – DIN FunctionEnter 3 for Aux Fault
Step 1- Assign the Function Step 2- Energize DIN 1To include fault
Clear Fault- NOWhen active, clears an active fault.
T202 – DIN FunctionEnter 7 for Clear Fault
Step 1- Assign the Function Step 2- Energize DIN 2To clear the fault
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Source of Speed
Override
0 ~ 10 VIN
Override 0 ~ 10VINSelects 0-10V or ±10V control as the frequency reference. Start source is
not changed.
AB Powerflex 4M
T201/T202 – DIN FunctionEnter 13 for 0 ~ 10VIN
Step 1- Assign the Function Step 2- Energize DIN 1/DIN 2To override 0 ~ 10V Source
VFDScaling
“Adjusting Voltage by Frequency Curves”
VFD Scaling
0V 5V 10V
1 Volt =5Hz
0 Hz
25 Hz
50 Hz
T211 = 0% (default)
Range 0 ~ 100%
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P104
Min. Freq.
(0 ~ 400 Hz)
P105
Max. Freq.
(0 ~ 400Hz)
t211
Min. Voltst212
Max. VoltsT212 = 100% (default)
Range 0 ~ 100%
VFD Scaling
0V 5V 10V
10 Hz
20 Hz
50 Hz
T211 = 0% (default)
Range 0 ~ 100%
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P104
Min. Freq.
(10 Hz)
P105
Max. Freq.
(0 ~ 400Hz)
t211
Min. Voltst212
Max. VoltsT212 = 100% (default)
Range 0 ~ 100%
VFD Scaling
1V 4.5V 10V
0 Hz
25 Hz
50 Hz
T211 = 10%
Range 0 ~ 100%
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P104
Min. Freq.
(0 ~ 400 Hz)
P105
Max. Freq.
(0 ~ 400Hz)
t211
Min. Voltst212
Max. VoltsT212 = 100% (default)
Range 0 ~ 100%
Scaling Value = Bias Voltage/Full Voltage x 100
= 1/10 x 100
= 10%
VFD Scaling
7.5V5V 10V
0 Hz
25 Hz
50 Hz
T211 = 50%
Range 0 ~ 100%
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P104
Min. Freq.
(0 ~ 400 Hz)
P105
Max. Freq.
(0 ~ 400Hz)
t211
Min. Voltst212
Max. VoltsT212 = 100% (default)
Range 0 ~ 100%
Scaling Value = Bias Voltage/Full Voltage x 100
= 5/10 x 100
= 50%
VFD Scaling
2.5V0V 5V
0 Hz
25 Hz
50 Hz
T211 = 0%
Range 0 ~ 100%
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P104
Min. Freq.
(0 ~ 400 Hz)
P105
Max. Freq.
(0 ~ 400Hz)
t211
Min. Volts
t212
Max. Volts
T212 = 50%
Range 0 ~ 100%
Scaling Value = (Full voltage - Bias Voltage)/Full Voltage x 100
= (10-5/10 x 100
= 50%
VFD Scaling
2.5V 5V 7.5V
0 Hz
25 Hz
50 Hz
T211 = 25%
Range 0 ~ 100%
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P104
Min. Freq.
(0 ~ 400 Hz)
P105
Max. Freq.
(0 ~ 400Hz)
t211
Min. Volts t212
Max. Volts
T212 = 75%
Range 0 ~ 100%
Scaling Value = (Full voltage - Bias Voltage)/Full Voltage x 100
= (10-2.5/10 x 100
= 75%
Scaling Value = Bias Voltage/Full Voltage x 100
= 2.5/10 x 100
= 25%
VFD Scaling
5V 7.5V
0 Hz
25 Hz
50 Hz
T211 = 50%
Range 0 ~ 100%
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P104
Min. Freq.
(0 ~ 400 Hz)
P105
Max. Freq.
(0 ~ 400Hz)
t211
Min. Volts t212
Max. Volts
T212 = 75%
Range 0 ~ 100%
Scaling Value = (Full voltage - Bias Voltage)/Full Voltage x 100
= (10-2.5/10 x 100
= 75%
Scaling Value = Bias Voltage/Full Voltage x 100
= 5/10 x 100
= 50%
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SignalsFeedback
Feedback – Relay Type
1. VFD Operation – Run & Stop
t221 =2
2. VFD Running Reverse
t221 = 3
3. VFD Desired Frequency Attained
t221= 6
t222 = Frequency
Related Parameter: t221 & t222
Sets the condition that changes the state of the output
relay contacts.
Sets the trip point for the digital
output relay if the value of t221
[Relay Out Sel] is 6, 7, 8, 10 or 11.
PLC & VFD Advanced Course4 PLC’s Training Platforms
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Thank You
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