Understanding “VFD ” nfi Allen Bradley Power Flex 4M Variable Frequency Drive
Dec 20, 2014
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
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)
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
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
P106 – Start SourceStop drive before changing this parameter.
Sets the control scheme used to start the
drive.
Source of Operation
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
Parameter Organization - Program
AB Powerflex 4M
P108 – Speed ReferenceSets the source of the speed reference to the drive.
Parameter Organization - Program
AB Powerflex 4M
P108 – Speed ReferenceSets the source of the speed reference to the drive.
Parameter Organization - Program
AB Powerflex 4M
P108 – Speed ReferenceSets the source of the speed reference to the drive.
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
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.
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
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
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
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
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
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%
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.