13
RAMPING—
The system utilizes a ramping function to minimize over
-
shooting the temperature setpoint. Every time
the system is powered on or the temperature setpoint is changed, a controlled ramp rate from the current tempera-
ture to the temperature setpoint takes place. This allows the system to achieve its temperature in a steady manner.
-
During the ramp cycle, the temperature controller will alternate the display between the normal state and the
ramping notification. The ramping notification displays
“
Attn
”
in the lower display and
“
rP1
”
in the
upper display
(“
Attention; Ramping
”).
-
The temperature controller accomplishes the ramping cycle by setting an
“
internal setpoint
”
that takes precedence
over the main setpoint when ramping. At the start of the ramp cycle, the
“
internal setpoint
”
is then set equal to
the current temperature and increased by 1°F every 15 seconds (4°F per minute) until the
“
internal setpoint
”
is
equal to the actual setpoint. Please note that though the ramping cycle has been completed, it still may take a few
moments for the fluid to reach the setpoint.
•
Press the
“
RIGHT ARROW
”
to display the Operations menu. Press the
“
LEFT ARROW
”
at any time to return to the
main display.
•
Use the numeric slide or the +/
-
keys to toggle between menu items
•
Use RIGHT ARROW to select menu item
•
Press HOME button at anytime to return to Home screen.
•
Press the
“
FN Button
”
to effectively pause the heating operation. Press the
“
FN Button
”
again to resume normal
operation.
-
This heater pause is achieved by changing the control mode to Manual and locking the heater output at 0%. This
can be seen by cycling to the heater power display as described above.
AUTOTUNE—
The temperature controller has been enabled with an Autotune function.
The Autotune function is an automatic sequence that optimizes the heating PID parameters to the specific system
and fluid. During this sequence, the controller learns how the system reacts and adjusts the control loop to result in a
better heater response.
•
The system response is dependent on many things. Including:
Fluid type
Flow rate
Ambient temperature
Overall system configuration.
•
Before enabling the Autotune sequence, make sure the system is operating as it normally would during the spray
application.
Note:
If the fluid being heated is extremely temperature sensitive, before enabling the Autotune sequence it is sug-
gested to lower the temperature setpoint below the maximum fluid temperature.
•
During the Autotune sequence, the temperature controller will intentionally overshoot the temperature setpoint
and then drop below the setpoint. This may happen several times.
•
During the Autotune sequence, the display will flash
and
. Once the Autotune is complet-
ed, the display will return to its normal state.
•
Allow the controller to complete the full Autotune sequence before adjusting the temperature or turning off the
controller.
