Watlow Series F4S/D - Manual (Page 34)

Six types of steps are available in the Series F4.
They are the building blocks of ramping profiles.
Use the six step types to create simple or complex
profiles involving all inputs and outputs. The Se-
ries F4 prompts you to define each step’ s proper-
ties, listed below.
• Autostart
• Ramp Time
• Ramp Rate
• Soak
• Jump
• End
Autostart
Autostart pauses a profile until the specified date
or day, and time (of a 24-hour-clock). Define the Au-
tostart by choosing:
1. Day (of the week) or Date,
2. Time
Note: To invoke an Autostart step in a profile, you
must activate the profile via the Profile Key and se-
lect the Autostart step.
Ramp Time
Ramp Time changes the set point to a new value in
a chosen period of time. Ramp Time is the same for
both channels of a dual-channel controller. Define
the Ramp Time step by choosing:
1. Wait for an event or process value;
(Wait for Events are set up in the Setup Page.)
2. Event outputs to turn on or off (if digital out-
puts are set up as events in the Setup Page);
3. Time (in hours, minutes and seconds);
4. Channel 1 Set Point;
5. Channel 2 Set Point (if dual channel);
6. PID set (one of five sets of heat/cool PID pa-
rameters per channel, pre-defined in the Oper-
ations Page);
7. Guaranteed Soak (requires the actual process
value to stay within the Soak Band as set in
the System Menu).
Ramp Rate
Ramp Rate (for single channel only) changes the
set point to a new value at a chosen rate. Define
the Ramp Rate step by choosing:
1. Wait for an event or process value;
(Wait for Events are set up in the Setup Page.)
2. Event outputs to turn on or off (if digital out-
puts are set up as events in the Setup Page);
3. Rate (units per minute);
4. Channel 1 Set Point;
5. PID set (one of five sets of heat/cool PID pa-
rameters, pre-defined in the Operations Page);
6. Guaranteed Soak (requires the actual process
value to stay within the Soak Band as set in
the System Menu).
1
Single
Channel
F4S
What Is a Ramping Profile?
A ramp is a programmed change from one set
point to another. A soak maintains the set point
over a period of time.
A profile is a set of instructions programmed as a
sequence of steps. The controller handles the pro-
file steps automatically, in sequence. As many as 40
different profiles and a total of 256 steps can be
stored in the Series F4’s non-volatile memory.
The 256 steps are grouped by profile. So, one pro-
file could have 256 steps; or 39 profiles could have
6 steps and one could have 22; or 32 profiles could
have eight steps each. The maximum number of
steps is 256, and the maximum number of profiles
is 40.
Figure 4.2 — An eight-step profile, as it might be logged
on a chart recorder.
Time
Te
mperature
4 . 2 ■ P r o f i l e P r o g r a m m i n g Wa t l o w S e r i e s F 4 S / D
Step Types — Building Blocks of Profiles