Allen-Bradley PowerFlex 755 User manual

Flying Start
PowerFlex 755 AC Drives
For Classroom Use Only!

Important User Information
This documentation, whether, illustrative, printed, “online” or electronic (hereinafter “Documentation”) is intended for use only as
a learning aid when using Rockwell Automation approved demonstration hardware, software and firmware. The Documentation
should only be used as a learning tool by qualified professionals.
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Reproduction of the contents of the Documentation, in whole or in part, without written permission of Rockwell Automation is
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Throughout this manual we use the following notes to make you aware of safetyconsiderations:
Identifies information about practices or circumstances
that can cause an explosion in a hazardous environment,
which may lead to personal injury or death, property damage, or economic loss.
Identifies information that is critical for successful application and understanding of the product.
Identifies information about practices or circumstances that can lead to personal injury or death, property
damage, or economic loss. Attentions help you:
• identify a hazard
• avoid a hazard
• recognize the consequence
Labels may be located on or inside the drive to alert people that dangerous voltage may be present.
Labels may be located on or inside the drive to alert people that surfaces may be dangerous temperatures.

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IntroSteps
Contents
Contents..........................................................................................................................................................................................3
Before you begin.............................................................................................................................................................................4
About this lab....................................................................................................................................................................................4
Tools & Prerequisites........................................................................................................................................................................4
Network Setup................................................................................................................................................................................. 5
About the PowerFlex 755 DHQ Demo Box...................................................................................................................................6
Drive Setup – Reset Defaults.........................................................................................................................................................7
Drive Setup – Auto Tune and Configuration Parameters............................................................................................................ 8
Connect to the Drive using Connected Components Workbench.....................................................................................................8
Configuring Drive Parameters...........................................................................................................................................................9
Flying Start.................................................................................................................................................................................... 12
Configuring the Drive Parameters for Flying Start..........................................................................................................................12
Demo..............................................................................................................................................................................................14
Enhanced Flying Start – Forward...................................................................................................................................................14
Sweep Flying Start – Forward.........................................................................................................................................................15
Sweep Flying Start – Reverse........................................................................................................................................................16

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Before you begin
Please review the following information before starting this lab.
About this lab
This session provides you with an opportunity to explore the Flying Start features of the PowerFlex 755 AC Drive. In this session
you will:
Demonstrate a scenario in which Flying Start is not used
Explore Flying Start Enhanced mode
Explore Flying Start Sweep mode
This lab takes approximately 40 minutes to complete.
Lab Objective
At the end of this lab you will be able to:
1. Configure the drive for Flying Start – Enhanced
2. Configure the drive for Flying Start – Sweep
Tools & Prerequisites
Software programs required
•Connected Components Workbench v9.01
•RSLinx Classic v3.80.00
Hardware devices required
•PowerFlex 755 DHQ Demo Box (PN-39023)
oPowerFlex 755 AC Drive (20G11-N-B-DM1AA6K32V8) – v12.001
•Ethernet patch cables
•Motor with flywheel attached

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Network Setup
Set IP Address of PowerFlex 755 to 192.168.1.30 by setting the IP address switches.
Ethernet Connections
1
PC
PF755 Ethernet Port
Hundreds – 0
Tens – 3
Ones – 0
Motor with Flywheel attached

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About the PowerFlex 755 DHQ Demo Box

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Drive Setup – Reset Defaults
Use the steps below to reset the drive to its default settings.
1. Press the ‘Folders’ button on the HIM keypad.
The button is located on the bottom row of the HIM Keypad (shown circled in the left image below). Pressing the ‘Folders’
button changes the HIM screen display to the Folders screen (see right image below).
PowerFlex 755
20G . . . B4P2
240V4.2A
00
PORTS
05 Universal Fdbk
00 PowerFlex 755
01 20-HIM-x6
06 Dual Encoder
2. Use the Enter key located in the center of theHIM keypad to select 00 PowerFlex 755.
3. Now, use the left or right arrow keys to navigate to the Memory heading, then select Set
Defaults.
4. Select This port only, then select the All option using the Enter key.
At this time the drive may display Fault 58, which is expected.
5. Clear the fault using the Red stop key (if necessary), then Confirm the reset.
6. Press ESC twice to return to the main display.

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Drive Setup – Auto Tune and Configuration Parameters
Use the settings below to auto tune the drive, and configure certain parameters for the lab.
Connect to the Drive using Connected Components Workbench
1. Open Connected ComponentsWorkbench using the icon on the desktop.
2. In the Device Toolbox expand Discover, then click Browse Connections in the Device Toolbox to open the
Connection Browser.
3. Browse to AB_ETH-1, Ethernet, and select 192.168.1.30, PowerFlex 755.
CCW will now connect to the drive, showing its information in the main pane of the software window.

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Configuring Drive Parameters
1. Select the Parameters button to view the parameters for the PowerFlex 755 drive.
2. Using the Group drop down list, expandMotor Control and select Motor Data.
3. Fill in the following parameters with thevalues found on themotor nameplate at this station.
Motor NP Volts
Motor NP Amps
Motor NP Hertz
Motor NP RPM
Motor NP Power
Be sure to press Enter after filling in each value to be sure the entry is confirmed.
4. Next, select Mtr Ctrl Options from the Group drop down list, and change the followingparameter, being sure to
press Enter after the change:
Motor Control Mode – Induction FV

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5. In the Group drop down menu, expand Drive Cfg and select Preferences. Change the following parameters:
300 – Speed Units – RPM
301 – Access Level - Expert
6. In the Group drop down menu, expand Speed Control, select Speed Reference andchange the following
parameters:
545 – Speed Ref A Select – Port 0: Preset Speed 1 (Picture A)
571 – Preset Speed 1 – 1400 (Picture B)
7. In the Group drop down menu, select Speed Regulator, and change the following parameter:
636 - Speed Reg BW – 5
8. In the Group drop down menu, expand Drive Cfg, then select Braking Features, and change the following
parameter:
409 - Dec Inhibit Act – Ignore
Picture A
Picture B

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Auto Tune
Follow the steps below to Auto Tune the Drive.
1. Using the Group drop down list, expandMotor Control and select Autotune, then change the Autotune value
to Rotate Tune.
Be sure to press Enter to confirm the Autotune value change.
2. Turn to the drive, and press the green Start button.
The drive will start its auto tune process. Follow its process using the display on the drive HIM module.
Inertia Tune
The motor has a large disk attached to the end of its shaft. By default, the Inertia parameter has a value of 2.00. In order to
make sure that the drive’s information is asprecise as possible, run an Inertia tune on the drive using CCW to update that value
to match the actual Inertia acting on the motor.
1. In CCW, in the Autotune field, select Inertia Tune.
2. Turn to the drive, and press the green Start button.
Follow the process on the HIM module of the drive.
The drive has now completed its auto tune procedure…. And has updated the remaining parameters determined during the
process.
You can now continue to the next section.

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Flying Start
The Flying Start feature is used to start an already rotating motor. When a drive is started in normal mode, it will apply a
frequency of 0 Hz to the motor and then ramp up to the desired frequency. If the motor is already rotating, the drive willtry to
force the motor to stop, which will generate large currents, which will cause an overcurrent fault.
There are two options to be considered when using the Flying Start feature of the PowerFlex 755 series drive.
Enhanced
Sweep
Use the steps below to configure the drive to allow the motor shaft to continue turning without power, then explore the different
options for Flying Start.
Configuring the Drive Parameters for Flying Start
The steps below will configure the drive to coast to a stop, configure a switch to determine Forward and Reverse Direction,
modify the Motor Control Mode, and modify the data displayed on the HIM module to easily view the changing frequency of the
drive.
1. Select the Parameters buttonto view the parameters for the PowerFlex 755 drive.
2. Using the Group drop down list, expand Drive Cfg and select Braking Features.
3. Click the field for Stop Mode A, and select Coast.
4. Using the Group drop down list, expand Feedback & I/O, and select Digin Functions.

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5. For 162 -DI Fwd Reverse, change the values to the following:
Port 7
1
2 – Input 2
6. Verify this change on the HIM module, by watching thedisplay while flipping the IN 2 switch on the demo box.
The HIM will display F, then R, as well as an arrow change when flipping the switch back and forth.
7. Make sure the switch is in the Forward position before continuing.
8. In the Group drop down list, select Mtr Ctrl Options found under Motor Control. Change the 35 – Motor Ctrl
Mode value to Induction SV.
9. In the Groups drop down list, expand Speed Control, and select Slip/Droop Comp. Change the following
parameter:
621 – Slip RPM at FLA – 0
10. Finally, turn to the drive, and on the HIM, select PAR# using the soft keys. With Parameter 1 showing, press
the soft key for Enter.
The HIM module will now show the Output Frequency value.

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Demo
In this demonstration, you will see what happens if a motor that is able to rotate withoutpower is commanded to start by the
drive.
1. Press the Start button on the HIM module of the drive.
2. Allow the motor to get up to its commanded speed, 1400 RPM.
This may take a few moments.
3. Now, press the Stop button on the HIM module, and allow the motor to coast for a minuteor so.
The drive is no longer controlling the motor – the motor will coast to a stop after a long period of time.
4. Press the Start button on the HIM module again.
The drive will display a fault – HW Overcurrent. This is because the drive will try to bring the motor down to a complete stop
before bringing it back up to speed.
5. Clear the fault using the Stop button.
Enhanced Flying Start – Forward
Use the steps below to explore the Enhanced option of the Flying Start feature.
1. In CCW, using the Group drop down list, expand Drive Cfg and select Start Features.
2. Change the 356 -Flying Start Mode parameter to Enhanced.
3. Turn to the drive and press Start.
Allow the drive to reach its speed.
4. Press the Stop button to stopthe drive.
Allow a minute or so to pass so that the motor begins to coast to a stop.
5. Now, press the Start button again.
Notice that the drive catches the motor right away, and brings it to its commanded speed.
The Enhanced option utilizes Counter-electromotive force, or CEMF. The drive sends current pulsesto the motor to find
and calculate the CEMF value, and when it finds that value, it is able to send the appropriate current to the motor to “catch”
the motor and then bring it up to the configured speed.

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Sweep Flying Start – Forward
The Sweep option for Flying Start utilizesa different method of finding the motor’s speed. Use the steps below to configurethe
drive for this option, then explore the results of that configuration.
1. In CCW, with the motor still turning, change the Flying Start Mode parameter to Sweep.
2. Change FS Speed Reg Ki to 1000.
This value is being changed to better demonstrate the Sweep Flying Start Mode feature.
3. Press the Stop button to stopthe drive.
Allow a minute or so to pass so that the motor begins to coast to a stop.
4. Now, press the Start button again, paying attention to the frequency displayed on thedrive, and the Analog
Output gaugeto the right of the drive in the demo box.
Notice that after a few seconds,the drive will catch the motor and bring it up to the commanded speed.
The drive sweeps the output frequency while watching the current in order to find the motor’s speed. It will then apply the
appropriate power to the motor, bringing it up to the configured speed.

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Sweep Flying Start – Reverse
In some applications, it is possible that the shaft of the motor will be found to be rotating in reverse without power applied. Use
the steps below to explore how Sweep Flying Start will address that situation.
1. With the motorstill running, flip the IN 2switch in the demo box to the right.
Because the motor was moving in the forward direction, the drive willramp the motor down to zero, then apply appropriate
power to reverse the motor’s direction. This may take a few moments, and the HIM module will display a flashing F and
arrow. Once the motor is moving in reverse, the HIM display willshow Rwith a reverse arrow.
2. Press the Stop button to stopthe drive.
Again, allow the motor to coast for a few seconds.
3. Flip the switch to the left, making sure the HIM module is indicating the forward direction.
4. Press the Start Button.
The drive will repeat the Sweep process, starting with the forward direction, and when it has determined that the motor is
not moving forward, it will then sweep the reverse direction.
FS Speed Reg Ki and Kp parameter values
The charts below show the frequency and the current being supplied to the motor. The motor is coasting, so
when the Start button is pressed on the drive, the drive will output the max forward speed, then start to
decrease according to a slope set by parameter 359 (FS Speed Reg Ki). When thatfrequency matches that
of the motor, the current dips, reverses, and the motor is accelerated back to the commanded speed.
The chart below shows the change of the current (blue), and the frequency (pink) as a result of this process
when using the default Ki (100) and Kp (75) values.

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Changed Ki parameter value
In the chart below, we see that the frequency trace has a more gradual slope(encircled in red). The drive
will take more time to detect the motor at this Kivalue – 1000.
Changed Kp parameter values

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In the chart below, we see two sweep procedures, paying close attention to the current trace in blue. Notice
that in the procedure on the left, the Kp value is set to 25, which results in a deeper dip in current when the
motor has been detected. In the sweep procedure on the right, the Kp value is set to 500, resulting in a
shallower dip of current.
Reverse Sweep
In the case of a motor turning in reverse of commanded direction, a flying start in sweep mode will still work.
The frequency will sweep in the forward direction first, and if it does not detect the motor, will begin sweeping
in the reverse direction. Once the motor has been detected, the drive will safely bring it to a stopped state,
then proceed to bring it to its commanded speed.

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Notes
Publication CE-DM253-EN-P — Sept 2015 Copyright© 2014 Rockwell Automation, Inc. All rights reserved.