32 310531
Configuring the PrecisionFlo Module
Adjust Kp and Kd Values Using an Oscilloscope
Connecting The Oscilloscope
If you are using an oscilloscope, follow this procedure
to connect it to the PrecisionFlo module:
1.
Connect one input channel of the oscilloscope to
the command signal jumper J7-pin 3 and the
common for the input channel to jumper J7-pin 4.
2.
Connect a second oscilloscope channel to the
outlet pressure transducer signal jumper J7-pin 5,
and the common to jumper J7-pin 6.
3.
Set the oscilloscope to trigger on a rise in the
outlet pressure transducer signal, and configure it
to store an entire 36-inch dispense path.
Set Kp (
with an oscilloscope)
To adjust Kp:
1.
Start the oscilloscope.
2.
Use the robot test program you created, from the
description on page 23, to dispense material in a
36 inch long path.
3.
Examine the oscilloscope trace and determine if
the outlet pressures for the first and third seg-
ments of the path are the same. If the pressures
are equal, the bead is even. If the pressures are
equal, go to step 6.
4.
If the1st and 3rd pressures are not the same,
increase Kp by 100 and examine the pressures
again. Continue to increase Kp in increments of
100 until either the pressures become equal, or
you reach 5000 Kp.
When the pressures become equal, go to step 6.
If Kp reaches 5000 and the pressures are still not
equal, go to step 5.
5.
Add 100 to Kd and rerun the test. If this does not
equalize the pressures, repeatedly increase Kd by
100 and retest until equality is achieved. Then
return to step 4.
6.
If the outlet pressure maintains its stability (Fig. 18
or Fig. 20), go to step 7.
If the bead does not maintain its stability, reduce
Kp by 100. Continue reducing Kp by 100 until sta-
bility is maintained. Then go to step 7.
7.
Fine tune Kp by:
a.
Adding 20 to Kp until the pressures become
equal.
b.
Then subtracting 20 from Kp until the pressur-
es maintain equality and stability.
8.
Fine tune Kp:
a.
Continue adding 20 to Kp until the outlet
pressures become equal, but the bead goes
unstable.
b.
Subtract 20 from Kp. The bead should now be
stable and have even outlet pressure.
9.
Go to the next section, Adjusting Kd
(with an
Oscilloscope).
