Future Design MCT-MC 4.3, User Manual

Page: 66 / 186

MCT-MC
4.3
FDC MCT-MC - 66 - Automatic Program Operation
NOTE: A step time of zero can be entered for a step to implement an immediate set point change. When
coupled with a hold back condition on the following step, there is no need to know the time it takes
for the process to reach set point. The hold back condition can be used to trigger the next step,
typically a soak, so that the desired soak time is achieved without having to determine what additional
time may be needed in order to make sure that the process reaches set point before starting the soak
time.
If the ramp units are set for units/hour or units/minute (instead of time), ramp steps are entered as a rate of
change in process units/time period. If a set point is entered for the step that matches the set point of the
previous step, the step will be skipped since the loop is already at set point.
6.1.2.1 Ramp/Soak Time Units Selection
The Time selection screen is accessed by selecting the “Time” menu item from the Edit pop-up menu. The
ramp and soak time selections both provide the option of hours and minutes (hh.mm) and minutes and seconds
(mm.ss). In addition, the ramp time selections include units/minute (u/min) and units/hour (u/hr). The selections
apply to all steps of the program. The time units can be changed at any time during program entry; however,
the time entry of each step is not scaled to the new unit selection when the change is made.