Omron E5EK PROGRAMMABLE TYPE User Manual page 74

CHAPTER 4 APPLIED OPERATION
J Program example
F Program
structure
F How the program
works
Parameters
Operation
at Input Error
4--12
Let's describe a typical example of a ramp rise rate setup program. In
an actual program, set the parameters to match the application.
100
10
Step 0
30
Target SP 0 : 100
Rate of rise 0 : 3
Soak time 0 : 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 opera-
tion from "10" in this example.
(2) As the rate of rise is set to "3", the Present SP takes 30 minutes
(100-10/3=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
minutes using the same formula.
(3) In step 1, the Present SP does not change, and the step time is the
value set to the "soak time 0" parameter (in this example, "30 min-
utes").
(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
value set to the "soak time 1" parameter (in this example, "30 min-
utes").
Symbol Parameter Name: Mode
Step time/Rate of rise programming
Target SP 0 to 3
:
Rate of rise 0 to 3
:
Soak time 0 to 3
:
: : to
By ramp rise rate setup method, starting at input error, the program start step is
the "step 1".
Step 1 Step 2
60
Target SP 1
Rate of rise 1 : 3
Soak time 1
: Expansion
: Program
: Program
: Program
Step 3
90 120
: 10
: 0.30
Description
Ramp rise rate
Ramp rise rate
Ramp rise rate
Ramp rise rate