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 & Enter

Start-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.

Thank You

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