Dwyer 32A - Manual (Page 12)

Page 12
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 Prog and make sure that Prog is set to OFF.
INDEX to PSEt and turn On.
Skip the StAt setting (this is discussed later) and press INDEX to 1ti.
The following items repeat in the following order: 1ti, 1SP, 1AL (if alarm is programmed as an event),
2ti, 2SP, 2AL, . . . , 16ti, 16SP, 16AL. 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 INDEX.
Set 1SP to the target value desired for the first ramp. This value is in actual units just like SP1. If the
control is programmed for temperature, then the SP displays are in temperature. If the control is pro-
grammed for some other engineering unit, the SP is set in that unit.
Press INDEX to continue. If Alarm is programmed as an event, then 1AL will appear. If you wish the
Alarm contact to function for this segment, set 1AL for On. If not, set for OFF. Press INDEX. If Alarm
is not programmed as an event, then 1AL will not appear. If 1AL is set to On, the Alarm function will
be active for the entire period as set in 1ti above.
Complete setting the segment times (2ti ... 16ti), segment set points (2SP... 16SP), and event alarm
(2AL ... 16AL) if it exists.
For unneeded or unused segments set the segment times (2ti ... 16ti) to 0, and set the segment set
points (2SP ... 16SP) to the same value as the last active set point. Event alarms may be set to indi-
cate "end of run" as you feel necessary.
The last menu item for the ramp / soak function is PEnd. PEnd determines what the control does when
the program has ended. You may choose to have the program repeat (LooP), Hold the last set point
(16SP), revert to the local SP1, or turn the outputs off (OoFF).
It is important to remember that if you want the program to repeat, you must allow the process to return
to the same condition that existed when the program first started. Remember that the ramp function
calculates the slope by drawing a line from the beginning PV to the ramp target set point. If the PV at
the end of the program is different than the PV at the initial start, the ramp will calculate differently.