4.3 Ramp Rise Rate Setup Program
E5CK
4–9
Let's describe a typical example of a ramp rise rate setup program. In an
actual program, set the parameters to match the application.
Step 0 Step 1 Step 2 Step 3
10
100
30 60 90 120
Target SP 0 : 100
Rate of rise 0 : 3
Soak time 0 : 0.30
Target SP 1 : 10
Rate of rise 1 : 3
Soak time 1 : 0.30
“Number of steps” = 4, “Time unit of ramp rate” = minutes, “PV start” = 10
In a program comprising four steps, steps 0 and 1 follow the settings of the
target SP 0", rate of rise 0" and soak time 0" parameters. Steps 2 and
3 follow the settings of the target SP 1", rate of rise 1" and soak time
1" parameters.
(1) As the program starts at PV (PV start), the program starts operation
from 10" in this example.
(2) As the rate of rise is set to 3", the Present SP takes 30 minutes
(100Ć10/3=30) to reach the target SP value 100" in step 0. If the PV
is 40" when the program is started, this time then becomes 20 minĆ
utes using the same formula.
(3) In step 1, the Present SP does not change, and the step time is the valĆ
ue set to the soak time 0" parameter (in this example, 30 minutes").
(4) In step2, the Present SP changes according to the value of rate of rise
1" parameter from that of target SP 0" parameter to that of target
SP 1" parameter It takes 30 minutes in this example.
(5) In step 3, the Present SP does not change, and the step time is the valĆ
ue set to the soak time 1" parameter (in this example, 30 minutes").
Symbol Parameter Name: Mode Description
Step time/Rate of rise programming : Expansion Ramp rise rate
Target SP 0 to 7 : Program Ramp rise rate
Rate of rise 0 to 7 : Program Ramp rise rate
Soak time 0 to 7 : Program Ramp rise rate
: to
By ramp rise rate setup method, starting at input error, the program start step is the
step 1".
Operation
at Input Error
JProgram example
F Program
structure
F How the program
works
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