60 minutes
60 minutes
60 minutes
60 minutes
60 C
60 C
60 C
60 C
5 minutes
5 minutes
30
minutes
30
minutes
35
minutes
35
minutes
65 minutes
65 minutes
-10 C
-10 C
-10 C
-10 C
Figure 5.9
Figure 5.9
Temperature Profile
of Chamber
Temperature Profile
of Chamber
Example 2: Programmable Bread Baking Oven
Example 2: Programmable Bread Baking Oven
Bread is baked in batches. A ramp is incorporated to control the thermal
gradient to suit for making the bread. A dwell timer is used to shut off the oven
power and alert the baker. The system is configured as shown in the following
diagram.
Bread is baked in batches. A ramp is incorporated to control the thermal
gradient to suit for making the bread. A dwell timer is used to shut off the oven
power and alert the baker. The system is configured as shown in the following
diagram.
Figure 5.10
Figure 5.10
A Bread Baking Oven
A Bread Baking Oven
+
+
AC Relay
AC Relay
OFF
ON
220VAC
Mains
220VAC
Mains
Heater
Heater
Baking
Oven
Baking
Oven
Push ON switch to start a batch. The temperature will rise with a ramp rate
determined by RAMP value. Bread is baked with the set point temperature for
a definite time which is programmed by TIME value, and then the power is
shut off. The temperature profile is shown in the following Figure.
Push ON switch to start a batch. The temperature will rise with a ramp rate
determined by RAMP value. Bread is baked with the set point temperature for
a definite time which is programmed by TIME value, and then the power is
shut off. The temperature profile is shown in the following Figure.
The
-8300 provides 4-20 mA signal to control the speed of the Inverter.
SP.P2 being chosen for EIFN is for the purpose of accomplishing a dual PID
control. You can perform auto-tuning twice at SP1 and SP2 for initial setup to
the dual PID values. Refer
and
.
ETR
sections 3-19
4-3
The
-8300 provides 4-20 mA signal to control the speed of the Inverter.
SP.P2 being chosen for EIFN is for the purpose of accomplishing a dual PID
control. You can perform auto-tuning twice at SP1 and SP2 for initial setup to
the dual PID values. Refer
and
.
ETR
sections 3-19
4-3
40
minutes
40
minutes
40
minutes
40
minutes
180 C
180 C
180 C
180 C
Cooling
down
Cooling
down
Restart a
new batch
Restart a
new batch
30 C/min
30 C/min
PV
30 C
30 C
5
45
Time
( minutes )
Time
( minutes )
A1FN=TIMR
SPMD=MINR
Time=40.0 ( minutes )
RAMP=30.0 ( C/min )
A1FN=TIMR
SPMD=MINR
Time=40.0 ( minutes )
RAMP=30.0 ( C/min )
Figure 5.11
Figure 5.11
Temperature Profile
of Baking Oven
Temperature Profile
of Baking Oven
91
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20