CHAPTER 3: USING PROGRAMMING FUNCTIONS
UNIFLOW
®
4 PULSED HEAT CONTROL
990-908 3-11
Item 4 on the menu, PID CONTROL, allows
the operator to fine tune the temperature
control. A PID CONTROL number in the
range of 100 to 269 can be selected from
the following table to achieve different
control features such as faster rise time or
less temperature overshoot. The default is
PID CONTROL 262,
Item 5 on the menu, SOLDER COOL
VALVE DELAY
, allows the operator to
< PID CONTROL >
PID CONTROL : 132
After edit Page to accept new value
Number Change, ◄► Adjust, Graph / Data
delay the turn-on of the Solder Cool Valve
after the end of the Reflow or Postheat periods. This single delay applies to both the end of Reflow and
Postheat periods. This parameter can be set from 0 to 9.9 seconds.
Selecting the PID CONTROL Number
The following table provides a guide to selection of a PID CONTROL number. It is recommended to start
with a PID CONTROL number of 185. With this initial setting you can then optimize the Coarse Heat
Rate
and Fine Heat Rate settings. After that you can return to the PID CONTROL number for additional
adjustments. For applications that require very fast rise of temperature with minimal overshoot, you'll
need to experiment with changes to all three control parameters: PID CONTROL, COARSE HEAT RATE,
and FINE HEAT RATE.
The table of PID CONTROL
numbers consists of two
separate sections.
Rows A through K typically
rovide the best PID CONTROL
number for most thermodes.
PID CONTROL numbers in rows
L
through Q may provide better
erformance for thermodes of
very low thermal mass or for
applications where additional
damping of oscillations is
needed.
When selecting a PID CONTROL
number in rows L through Q it is
recommended to start with a
PID
CONTROL
number of 243.
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