CHAPTER 4: OPERATING INSTRUCTIONS
UNIFLOW
®
4 PULSED HEAT CONTROL
990-908 4-7
Abbreviation Time Calculation
BAS Baseheat Initiation of process to end of Baseheat time.
RS1 Rise1
End of
Base to when the actual temperature reaches the Preheat temperature setting less
the user-set
Preheat Temperature Delta in the Profile.
PRE Preheat
From the point where
Rise1 reached the Preheat temperature setting less the Preheat
Temperature Delta
to end of Preheat Time
RS2 Rise2
End of
Preheat Time to when actual temperature reaches the Reflow temperature setting
less the
Reflow Temperature Delta.
RFL Reflow
From point where
Rise2 reached the Reflow Temperature setting less the Reflow
Temperature Delta to end of Reflow time
CL1 Cool1 End of Reflow Time to when Cool1 temperature setting is reached.
PSH Postheat End of Cool1 to end of Postheat Time.
CL2 Cool2 End of Postheat Time to when Cool2 temperature setting is reached.
Preheat and Reflow Control
The process timing for Preheat, Reflow and Postheat can be set for control based on TIME or
TEMPERATURE. This setting is made in the Schedule Setup.
If TIME is selected for Preheat and Reflow Control, the Control will execute the full Rise1 and Rise2 user-
set times before starting the Preheat and Reflow user-set times. The Control will follow the programmed
Rise1 and Rise2 ramp slopes for the full Rise1 and Rise2 times. The Control will also execute the full
Preheat and Reflow times.
If TEMPERATURE is selected for Preheat and Reflow Control, the Control will execute Rise1 until the
actual temperature reaches the Preheat temperature setting less the user-set Preheat Temperature Delta in
the Profile. At that point, the Control will switch to the Preheat stage and control to the Preheat
temperature for the length of time the user-set for the Preheat time. For example, if the Preheat
temperature is set to 150°C and the Preheat Temperature Delta is set to 10°C, Rise1 will end and Preheat
will begin when the temperature reaches 140°C during
Rise1. Rise2 and Reflow will perform in a
similar manner.
Functionality Example #1: Temperature is selected for Preheat and Reflow Control. This
example is based on the following Control settings:
Temperature delta for preheat = 10° C
Rise1 time of 2.0 seconds
Preheat time of 3 seconds
Preheat temperature of 150°C
To Next Page
Loading...