CHAPTER 3: USING PROGRAMMING FUNCTIONS
UNIFLOW
®
4 PULSED HEAT CONTROL
3-12 990-908
There is a big change in performance when jumping from Row K to L. Row L has roughly control
performance similar to Row A and Row K has roughly similar control performance to Row Q.
Performance is optimized within rows A through K or within rows L through Q.
When trying different PID Control numbers, move up from 185 or 243 for faster rise time or down
to reduce overshoot and oscillations. Move right from
185 or 243 to reduce overshoot and
oscillations. Move left from
185 or 243 for less damping of the temperature rise.
Pressing the GRAPH key when the
Schedule Setup, Page 3 of 5, screen is
displayed will change the display to the
Schedule Setup, Page 4 of 5. This screen
contains parameters for the Auxiliary
thermocouple’s Peak and Average limit
settings.
Press the 1 key to toggle ENABLE PEAK
AND AVG LIMITS
to between ON and
OFF.
If set to ON, then the Control will monitor
temperatures and trigger an Out of Limits
< SCHEDULE SETUP, Page 4 of 5 >
AUXILIARY THERMOCOUPLE
1. ENABLE PEAK AND AVG LIMITS : OFF
2. PREHT PEAK TIME DELAY : 00.0 SEC
3. PREHT AVG TIME DELAY : 00.0 SEC
4. PREHT PEAK HI TEMP LIMIT : +030 C
5. PREHT PEAK LO TEMP LIMIT : -030 C
6. PREHT AVG HI TEMP LIMIT : +030 C
7. PREHT AVG LO TEMP LIMIT : -030 C
8. REFLOW PEAK HI TEMP LIMIT : +030 C
9. REFLOW PEAK LO TEMP LIMI : -030 C
0. REFLOW AVG HI TEMP LIMIT : +030 C
<. REFLOW AVG LO TEMP LIMIT : -030 C
Number Select, Page, Graph / Data
if the peak and/or average temperature is
outside the set limits. If set to OFF, the Control will not monitor any peak or average temperatures.
Item 2 on the menu, PREHT PEAK TIME DELAY, allows the operator to set the Control to ignore the first
part of the Preheat process cycle when selecting the peak Preheat temperature. This parameter can be
set from 0 to 99.9 seconds. If this parameter is set equal to or greater than the Preheat Time, then the
Control will not evaluate any peak temperature error, and will use 0C as the Preheat Peak Temperature
for display and communication.
Item 3 on the menu, PREHT AVG TIME DELAY, allows the operator to set the Control to ignore the first
part of the Preheat process cycle when calculating the average Preheat temperature. This parameter can
be set from 0 to 99.9 seconds. If this parameter is set equal to or greater than the Preheat Time, then the
Control will not evaluate any average temperature error, and will use 0C as the Preheat Average
Temperature for display and communication.
Press the
4 through < keys to edit the high and low limits for the peak and average temperatures. The
number entered will be the difference between the profile set temperature and the limit. For example, if
the
AUX PREHEAT TEMPERATURE is set to 150 °C, and the peak temperature should not exceed 180 °C,
then you should enter 30 °C in the PRHEAT PEAK HI TEMP LIMIT field. Use the numeric keys on the front
panel to enter a number and then press the
▲, GRAPH or DATA keys to save the value. For the Reflow
process step the Control will use the AUX REFLOW TEMPERATURE as the reference temperature.
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