DynaJet® IC7140
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Calibrating the System
The following steps will use the DynaJet IC7140’s Proportional Gain
and Derivative Gain settings to calibrate the system:
1.
Set Operation Mode to Adjustable Droplet Mode.
Adjustable Droplet Mode – Select the intended
nozzle and the droplet size range with the option
to adjust the target droplet size.
2.
Choose the nozzle being used from the Nozzle Favourites screen.
When communicating with a rate controller, be sure that both the
rate controller and the DynaJet are set to the same nozzle.
3.
Run “Highest Pressure/Smallest Droplet Size” configuration.
4.
Notate Proportional Gain and Derivative Gain values for reference
with Lower Pressure/Larger Droplet Size verification.
5.
Run “Lower Pressure/Larger Droplet Size” verification.
If more than one nozzle size is going to be used on the machine, then
using a different Gain Preset, run a test with the same values for
Proportional Gain and Derivative Gain for the other nozzles. Always
check at the highest pressure/smallest droplet size that will typically
be used.
Change the DynaJet control to Manual Mode can assist in trying to
isolate oscillations by determine if an oscillation in the system is being
caused by the rate controller of the DynaJet. If oscillations continue
while in Manual Mode, the issue may be with rate controller.
If oscillations are seen in Manual Mode due to the rate controller,
adjustments to the rate controller’s Control Hold Delay may need to be
made.
◄
A Control Hold Delay set (numerically) too high will be slow
to adjust pressure and may cause the control to have to
make a second adjustment to the flow.
◄
A Control Hold Delay set (numerically) too low will react too
quickly to dynamic changes on the machine and may start
the pressure adjustment in the wrong direction (which will
also make the control slow to get to rate)
Highest Pressure/Smallest Droplet Size
Calibrate Proportional Gain
1.
On the Operation screen, using the DROPLET SIZE
ENGAGEMENT/ DISENGAGEMENT KEYS, choose the highest
pressure/smallest droplet size that will typically be used by
disabling Droplet Size Keys.
Example:
to
2.
Run the system and view on the DynaJet IC7140 the Current
Nozzle Pressure diamond on the Nozzle Gauge when changing
speed.
3.
Increase the Proportional gain until system is oscillating across
the target pressure then stepped down to stability. Most machines
operate with a setting between 4 to 12 for Proportional gain.
Proportional Gain value at highest pressure/smallest droplet size:____
Calibrate Derivative Gain
4.
Using the same speed changes as before, view the Current
Nozzle Pressure diamond on the Nozzle Gauge when changing
speed
5.
Begin increasing Derivative gain to see how quickly you can get
the pressure to get to target without inducing an oscillation. Most
machines operate with a setting between 4 to 8 for Derivative
gain.
Derivative Gain value at highest pressure/smallest droplet size:____
Lower Pressure/Larger Droplet Size
6.
After Proportional Gain and Derivative Gain have been set, using
the Droplet Size Keys, choose a lower pressure/larger droplet size
that will typically be used by disabling Droplet Size Keys.
Example:
to
7.
Run the system using the same speed changes and view on the
DynaJet IC7140 the Current Nozzle Pressure diamond on the
Nozzle Gauge when changing speed.
Typically, the settings will not have to be changed for the lower
pressure applications.
Summary of Contents for DYNAJET IC7 140
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