PowerFlex 520 Series PID Demo
Summary
TLDRIn this ESN TV video, VFD specialist Mark Garner explains the use of the PowerFlex 520 series' P mode with trim capabilities. The P mode, integral for maintaining process feedback like pressure or flow, operates by generating an error value based on the difference between the PID feedback and a reference. Garner distinguishes between the single P control loop in the PowerFlex 523 and the two available in the PowerFlex 525, which can only be used one at a time. He illustrates exclusive control in a pumping application and trim control in a winder application, demonstrating how the P mode adjusts motor speed to maintain set points. The video concludes with a practical demonstration using CCW software and emphasizes the importance of consulting the user manual for optimal P tuning.
Takeaways
- 🔧 The Powerflex 520 series drives feature a P (Proportional, Integral, Derivative) control loop designed for maintaining process feedback like pressure, flow, or tension at a set point.
- 🔄 The P Loop operates by calculating the error between the PID feedback and the reference, adjusting the frequency output to minimize this error.
- 📈 Powerflex 523 has one P control loop, while Powerflex 525 has two, though only one can be used at a time.
- 🎛️ Two common configurations for the P Loop are exclusive control and trim control, each serving different automation needs.
- 🚰 In exclusive control, the P output becomes the sole frequency command, as seen in pumping applications where system pressure is the focus.
- 📏 Trim control adds the PID output to the speed reference, useful in applications like winders where tension is managed against a master speed reference.
- 🛠️ Demonstration of P with trim control is shown using CCW software, where the setup includes selecting P1 output, P set point, and analog input for feedback.
- ⚙️ Keypad frequency is adjustable and trims the motor speed in response to changes in analog input voltage, within set limits.
- 📚 P tuning can be complex and may require trial and error; consulting the Powerflex 525 user manual and application notes is advised for optimal setup.
- 🤝 For further assistance or to understand P control theory better, reaching out to a local ESN account manager or automation specialist is recommended.
Q & A
What does 'P' stand for in the context of the PowerFlex 520 series drives?
-In the context of the PowerFlex 520 series drives, 'P' stands for Proportional, Integral, Derivative, which are control loop features built into the drives.
How does the P Loop in the PowerFlex 520 series work?
-The P Loop works by subtracting the PID feedback from a reference and generating an error value. It then reacts to this error based on the P gains and outputs a frequency to reduce the error value to zero.
What is the difference between PowerFlex 523 and PowerFlex 525 in terms of P control loops?
-The PowerFlex 523 has one P control loop, while the PowerFlex 525 has two P control loops, but they can only be used one at a time.
What are the two basic configuration examples where the P Loop may be used?
-The two basic configuration examples where the P Loop may be used are exclusive control and trim control.
In a pumping application, how does the P Loop maintain the desired system pressure set point?
-In a pumping application, the P reference equals the desired system pressure set point, and the pressure transducer signal provides PID feedback to the drive. Fluctuations in actual system pressure due to changes in flow result in a PID error value, and the drive adjusts the output frequency to correct the P error value, thus maintaining the desired system pressure set point.
How does trim control work in a winder application using the P Loop?
-In a winder application, the PID output is added to the speed reference. The P reference equals the equilibrium set point, and the dancer potentiometer signal provides PID feedback to the drive. As tension increases or decreases during the winding, the speed reference is trimmed to compensate, maintaining tension near the equilibrium set point.
What is the purpose of the setup wizard in the CCW software for configuring P with trim control?
-The setup wizard in the CCW software is used to configure P with trim control by setting up parameters such as speed reference, P set point, P feedback select, and keypad frequency.
What is the minimum and maximum frequency limits when using P with trim control in the demonstration?
-In the demonstration, the minimum frequency limit is 37 Hertz, which is three Hertz below the base frequency of 40 Hertz, and the maximum frequency limit is 43 Hertz.
Why is it recommended to consult the PowerFlex 525 user manual and application notes for setting up PID control?
-It is recommended to consult the PowerFlex 525 user manual and application notes for setting up PID control because P tuning can be complex and might require trial and error to achieve optimal results. The manual and notes provide detailed instructions specific to the application.
What is the importance of understanding P control theory for achieving effective and stable control of processes?
-Understanding P control theory is important for achieving effective and stable control of processes because it helps in setting up the correct parameters and understanding how the P Loop reacts to errors and adjusts the output frequency accordingly.
Outlines
🔧 Introduction to PowerFlex 520 Series P Mode with Trim Capabilities
Mark Garner, the VFD specialist, introduces a tutorial on using the PowerFlex 520 series variable frequency drives (VFDs) in P mode with trim capabilities. He emphasizes the importance of subscribing to the ESN TV YouTube channel for more automation content. The P mode, which stands for proportional, integral, and derivative control, is integral for maintaining process feedback such as pressure, flow, or tension at a set point. The P loop's function is explained as the process of subtracting PID feedback from a reference to generate an error value, which it then attempts to reduce to zero by adjusting the output frequency. The differences between the PowerFlex 523, which has one P control loop, and the PowerFlex 525, which has two but can only use one at a time, are highlighted. Two basic configuration examples are given: exclusive control, where the P output becomes the entire frequency command, and trim control, where the PID output is added to the speed reference. A pumping application and a winder application are used as examples to illustrate how the P loop maintains the desired system pressure and tension, respectively.
Mindmap
Keywords
💡Powerflex 520 series
💡P mode
💡Trim capabilities
💡PID control loop
💡Set point
💡Process feedback
💡Error value
💡Exclusive control
💡Trim control
💡CCW software
💡P tuning
Highlights
Introduction of Mark Garner as a VFD specialist for ESN, focusing on the PowerFlex 520 series drives.
Encouragement to subscribe to ESN TV YouTube channel for more automation content.
Explanation of the P (proportional-integral-derivative) mode and its role in controlling process feedback like pressure, flow, or tension.
The PowerFlex 520 series uses PID feedback to maintain a setpoint by generating an error value and adjusting frequency accordingly.
Key difference: PowerFlex 523 has one P control loop, while the PowerFlex 525 has two P control loops, but only one can be used at a time.
Two configuration examples of P mode: exclusive control and trim control.
Exclusive control explained using a pumping application, where the drive adjusts motor speed to maintain system pressure setpoint.
Trim control explained using a winder application, where the drive adjusts speed to maintain tension equilibrium.
Demonstration of P with trim control using the CCW software.
In the demonstration, the setup wizard is used to configure speed control, where the speed reference is set to P1 output.
Analog input of 0-10 volts is used as P feedback, with keypad frequency set for 40 Hz and the ability to trim up or down by 3 Hz.
Explanation of how increasing and decreasing voltage affects motor speed, with a lower limit of 37 Hz and upper limit of 43 Hz.
Clarification that P tuning can be complex and may require trial and error for optimal results.
Recommendation to consult the PowerFlex 525 user manual for detailed instructions on PID control setup.
Final reminder that understanding P control theory is essential for stable and effective process control.
Transcripts
hello I'm Mark Garner the vfd specialist
for es& in this video we will be going
over how to use the powerflex 520 series
P mode with trim capabilities but before
we get started please be sure to
subscribe to ESN tv YouTube channel for
more automation
[Music]
content P stands for proportional
integral derivative and our control Loop
features built into the powerflex 520
series of drives the P Loop is used to
maintain a process feedback such as
pressure flow or tension at a desired
set point the P Loop works by
subtracting the PID feedback from a
reference and generating the error value
the P Loop reacts to the error based on
the P gains and outputs a frequency to
try to reduce the error value to zero
it's important to know that the
powerflex 523 has one p control Loop
while the powerflex 525 has two P
control loops however with the 525 they
can only be used one at a time two basic
configuration examples where the P Loop
may be used are exclusive control and
trim control in exclusive control the
speed reference becomes zero and the P
output becomes the entire frequency
command taking a pumping application for
example the P reference equals the
desired system pressure set point the
pressure transducer signal provides the
PID feedback to the drive fluctuations
in actual system pressure due to changes
in flow result in a PID error value the
drive output frequency increases or
decreases to vary motor shaft speed to
correct the P error value the desired
system pressure set point is maintained
as valves in the system are open and
closed causing changes in flow in trim
control the PID output is added to the
speed reference in this example of a
Winder application the P reference
equals the equilibrium set point the
dancer potentiometer signal provides PID
feedback to the drive fluctuations and
tension result in PID error value the
master speed reference sets the wine
unwind speed as tension increases or
decreases during the winding the speed
reference is trimmed to compensate
tension is maintain near the equilibrium
set point now we're going to demonstrate
the p with trim control as we open up
your CCW software as you can see under
the setup wizard you go under speed
control and you can see that our speed
reference is set for P1
output our select is going to be P set
point our P feedback select is going to
be 0 to 10 volts it's going to be our
analog input and we're actually going to
trim on the keypad frequency keypad
frequency is going to be set for 40
HZ we're going to be able to trim go up
and go down three Herz okay we're going
to start the
drive the keypad frequency is set for 40
Herz as you can
see the analog input here is set for 5
volts as I increase the voltage of the
analog input you'll notice that the
frequency is going down so we're
actually slowing the
motor we'll keep increasing as you can
see it will not go below 37 Hertz which
is three Hertz below the 40
as I decrease the 5
volts we'll go back to 40
Hertz and as I keep decreasing the
frequency will rise and the speed will
increase but note we will not go above
43 Hertz that is p with gy
control remember that P tuning can be a
bit complex and might require some trial
and error to achieve optimal results I
highly recommend Consulting the
powerflex 525 user manual and any
relevant application notes to detailed
instructions on setting up PID control
specific to your application having a
solid understanding of P control theory
will greatly help in achieving effective
and stable control of your processes
thank you for watching and if you need
further assistance please reach out to
your local ESN account manager or
automation
[Music]
specialist
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