CHAPTER 3: USING PROGRAMMING FUNCTIONS
UNIFLOW
®
4 PULSED HEAT CONTROL
990-908 3-5
NOTE: The Reflow temperature will always be higher than the actual melting point of the solder or heat
seal adhesives due to heat losses in both the thermode and parts.
Reflow is shown as having a time length of 3.0 seconds and a set-point temperature of 350C. Time can
be set for 0.1 to 99.9 seconds. Set-point temperature can be set from 60C to 600C. Reflow can also be
set in an extended temperature range up to 999C
Cool1
You use
Cool1 to ensure that a solder joint or heat seal adhesive has solidified. If a Postheat stage is not
being used, an air actuated reflow soldering head or a heat seal head retracts the thermode from the parts
upon reaching the
Cool1 temperature. The Cool1 parameter shows 200C. Set-point temperature can be
set from 25° to 300°C. The Cool1 time is not controlled.
Postheat
You can use Postheat to provide a higher temperature for when the thermode will be lifted off the
process part. This feature provides a reduction in contaminant buildup on the thermode. The point at
which during the Postheat stage when the thermode will be lifted is determined by the user setting for
Head Up Delay.
Postheat is shown as having a time of 2.0 seconds and a set-point temperature of 250C. Time can be
set for 0 to 99.9 seconds. When it is set to 00.0 seconds, the Postheat state is omitted. Set-point
temperature can be set from 25C to 600C.
Cool2
You use Cool2 to establish a temperature for the end of process. The Cool2 parameter shows 150C.
Set-point temperature can be set from 25° to 300°C. The Cool2 time is not controlled.
Profile Description and Programming
The parameters contained in each profile are viewed and edited in two areas. The last two lines of the
GRAPH screen contain the temperature and time settings for each process cycle. The two Schedule
Setup
screens contain error limits, temperature envelopes, process and display parameters.
Temperature and Time Parameters
The temperature and time values are edited with the keys located on the front panel just below the
display. For detailed information on entering the temperature and time settings for a profile, refer to
Chapter 4, Operating Instructions, Section V.
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