We're back at another episode of Problem Solved. What's our topic today?
We're gonna talk about an F5 startup using closed loop operation today.
All right, let's do this.
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Alright, let's dive into it. What are the basic requirements for this F5 startup?
Yeah, Jake, similar to our start a video with the S6 drive we'll need our
five basic components to start up a closed-loop drive with an F5. We need our
AC incoming power, our KEB F5 drive, a motor, a feedback system for speed
control, and our programming software to set up the drive. We're working with our
F5 desk demo today. And on the demo we have our AC incoming power that goes
into our F5 KEB drive. The KEB drive is powering our KEB asynchronous
induction motor. The induction motor is fitted with an incremental encoder, which
is connected via our green cable here for our feedback system, and we also have
our blue, USB-to-serial converter which is connecting to our COMBIVIS 6
software on our local PC.
Now that we have the hardware requirements down
Can you walk us through the steps to program the F5 Drive for closed loop operation?
Of course, let's do it.
I started off by connecting my KEB F5 Drive to my local
PC using our KEB USB-to-serial converter. I've opened COMBIVIS 6 on
my PC, scanned for my device, and now we're ready to begin programming via
COMBIVIS 6. So, let's get to it.
I have already created a closed loop startup for F5 parameter list,
which is shown here on the left side under the navigator window.
Unlike the S6 drive the F5 drive does not have integrated programming
wizards and instead the programming is strictly parameter based.
Just for reference, this parameter list was created in accordance with the F5
application manual, which is available to customers who use the free registration
of COMBIVIS 6 on our keb.de web page.
Opening the parameter list, we see a list populated with parameters and their
desired program values. Looking at the columns in the parameter list we have
our read/write indicator, ID text, parameter name, offline value column,
which represents the desired value we are writing in our program, the online value
column. We are going to ignore this column at the moment, but this displays
the active parameter value inside a connected KEB Drive.
And the comment column,
this allows for user comments and notes. Breaking down this parameter list
we can see most of the basic ten steps that help us set up the F5 for closed loop
operation. Before starting step one however we must ensure that the F5 Drive
is disabled or is in an "noP" state. Then beginning with step 1, we set our
control type to the value "4." This essentially sets the drive operation for
an induction motor and sets the speed range of up to 4,000 RPM maximum.
Step 2 of the parameter lists loads factory default settings to ensure we are
starting our parameterization from scratch. Step 3 of the startup sets
the drive into closed-loop control with encoder feedback. And step 4 then sets
the feedback device to encoder 1. In step 5, we are going to set the pulses
per revolution, or PPR of the incremental encoder, which is 2500 for this
particular encoder device. For step 6, we're going to be inputting our motor
rated data, which would be obtained from the motor nameplate or motor
specification sheet from the manufacturer. We require the rated
current, rated speed, rated voltage, rated power, rated power factor, and rated
frequency. The stator resistance, Sigma inductance, rotor resistance, and head
inductance, will be computed shortly via the motor identification in step 9.
In step 7, we are going to modify a few parameters that are very important for
optimized performance in closed loop operation, using the motor model.
These parameters help set proper flux control and magnetization build-up and
allow the drive to calculate dead time characteristics and motor dependent data.
Moving on to step 8, we will set our desired maximum speed and for this test
I will set the value of that maximum speed to 1000 rpm.
Enter.
Now that we've finished setting step 8, we are going to want to download our program values
into the F5 Drive. essentially what we are wanting to do is to push the offline
values that we have programmed into the online values of the drive. To do this we
can go up here to this green downward arrow which says download lists to device.
We will click that. It asks, "would you like to start the download?"
We will click, yes. And now this will program our drive via this download
And once that's successful, we have programmed our drive. But we are not
quite done yet. Step 9 of our startup procedure is
actually to perform an auto identification for the motor, or a motor
identification. To do this, we will go back to our drive tab. And then we will
go into the "Online Wizards" tab of the drive. And if it's not already selected
we will want to make sure to select motor ident on the left. And when you
select the motor ident tab, our motor identification wizard window populates
the screen. We're going to jump right to box 2 "Type Plate," since the drive was
already adjusted and programmed via the program download we just did. In the type
plate, we are going to want to confirm our motor nameplate data, that is
actually on the physical motor that we are working with. This data should be
accurate since we programmed it via the download we just did, but it's good to do
a second verification here. Once we verify that this type plate data is
accurate for the motor we're running. We can start the identification.
I usually click the down arrow and select "Auto ident with move"
Now this is only to be used if a motor is completely unloaded
and un-coupled from any other load.
If your motor is loaded or coupled to any other mechanical object, it is best to use
"Auto ident without move" to ensure the best possible identification.
So selecting "Auto ident with move," in this case, a pop-up appears and allows us to again
confirm our motor nameplate data, which then we will click OK.
The actual value source, or speed feedback is set to encoder channel 1,
which is what we want. So we will click OK here.
This pop-up asks us to start identification.
During the identification the motor may move and you may hear
audible noises of varying frequency, which is completely normal for the
identification process. The identification may take anywhere from
30 seconds up to a couple minutes, depending on the system.
So we will click Yes, or OK.
So now we will set our control release, which we have set.
And now we will click, "OK," and our identification will begin.
(VFD frequency noises)
All right, we will reset our control release.
And that completes our motor identification in step 8 of our startup.
Going back into the closed loop parameter list, just for a moment. We see
that the resistance and inductance values have changed in the online value
column. From our motor learn, these values were learned, and then modified in the
drive real time. Now that we have performed our motor identification we
are ready for the final step, which is some test runs of our F5 Drive and motor.
For our test run, I have created a scope trace which will capture and monitor the
inverter state and encoder speed of the motor. Opening that scope, we are going to
be monitoring encoder 1 speed, and the inverter status of the drive.
Using a potentiometer connected to the analog input of the drive, we can vary the speed
and perform some motor function test.
So let's give this a shot and spin the motor.
And that is how we start up an F5 drive-in close-up operation.
So now we've gone through the steps on how to start up an F5 Drive.
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We look forward to solving more of your problems in the future.
Have a great day.