Dwyer 16A - Manual (Page 12)

to program the target set point and the time desired to reach that point. When the
ramp segment is executed by the control, it calculates the ramp required to move
the process from the starting value (current PV) to the desired value (programmed
SP) in the time allowed.
Soaks (or dwells) are ramp segments where the target set point is the same as the
beginning process value. This allows for multistage ramps without wasting interme-
diate soak steps. Care must be taken, however, that the process does actually reach
the soak value before the soak time starts. If not, the next segment will calculate a
slope from the starting PV to the target SP. Depending on your process require-
ments, this difference may be important. Make sure to test any program for desired
results before running production material.
Do not operate Self Tune while a ramp function is operating. The ramp func-
tion will prevent the Self Tune from operating properly. Make sure that all
tuning is set up before operating Ramp / Soak.
Program Setup
All of the programming for the Ramp / Soak function is done in the Secondary Menu.
You may wish to work out your program on paper before going into the programmer
menu sequence.
In the Secondary Menu INDEX to Pro9 and make sure that Pro9 is set to 0FF .
INDEX to PSEt and turn 0n . Press ENTER.
Skip the StAt setting (this is discussed later) and press INDEX to tbAS .
The time base menu item, tbAS , allows selection of the amount of time that is count-
ed per time unit. Setting tbAS to 1 makes all time settings use a time base of one
second. A tbAS setting of 60 makes all times settings use a time base of 60 sec-
onds, or one minute. Make the appropriate selection and then press ENTER
and INDEX to 1ti .
The following items repeat in the following order: 1ti , 1SP, 1A1 (if AL1 in the Secure
Menu is programmed set to EUnt ), 2ti , 2SP, 2A1, . . . , 16ti, 16SP, 16A1 . To avoid
repetition each item will only be described once.
Set 1ti to the amount of time you want for the first ramp. This value is in time units
(determined by the tbAS menu item) from 0 to 9999 . Press ENTER.
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