May, 2013
Page 16 of 52
949-1194 Rev. 7
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 intermediate
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 requirements, 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 function 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
P r o 9
and make sure that
P r o 9
is set to
O F F
.
INDEX to
P S E t
and turn
O n
. Press ENTER.
Skip the
S t A t
setting (this is discussed later) and press INDEX to
1 t i
.
The following items repeat in the following order:
1 t i
,
1 S P
,
1 A 1
and/or
1 A 2
(if
A L 1
or
A L 2
in
the Secure Menu are programmed set to
E U n t
),
2 t i
,
2 S P
,
2 A 1
,...,
1 6 t i
,
1 6 S P
,
1 6 A 1
,
1 6 A 2
. To
avoid repetition each item will only be described once.
Set
1 t i
to the amount of time you want for the first ramp. This value is in time units
(determined by the
t b A S
menu item) from
0
to
9 9 9 9
. Press ENTER.
Set
1 S P
to the target value desired for the first ramp. This value is in actual units just like
S P 1
. If the control is programmed for temperature, then the SP displays are in temperature.
If the control is programmed for some other engineering unit, the SP is set in that unit.
Press INDEX to continue. If Alarm 1 is programmed as an event (
A L 1
=
E U n t
), then
1 A 1
will appear. If you wish the Alarm 1 contact to function for this segment, set
1 A 1
for
O n
. If
not, set for
O F F
. Press ENTER. When
1 A 1
is set to
O n
, the Alarm 1 function will be
active for the entire period set in
1 t i
above.
Complete setting the segment times (
2 t i
...
1 6 t i
), segment set points (
2 S P
...
1 6 S P
), and
event alarms (
2 A 1
...
1 6 A 1
) to
O n
or
O F F
.
For unneeded or unused segments set the segment times (
2 t i
...
1 6 t i
) to
0
, and set the
segment set points (
2 S P
...
1 6 S P
) to the same value as the last active set point. A segment
alarm may be set to indicate “end of run” at the segment number you select.
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