Chapter 5 Applications - Brainchild P41 User Manual

Chapter 5 Applications

Chapter 5 Applications
A heat treatment oven need to vary temperature as a function of time.
Because the process requires a rapid increase of temperature as it is
heated and a rapid decrease of temperature as it is cooled. In order to
achieve a rapid increase of temperature, an additional heater is turned
on at higher range of temperature. A cooling fan is turned on to
accelerate the cooling rate as the temperature falls fast. An alarm is
required to announce the operator as the procedure is finished.
Since the condition is changing when an additional heater is turned on,
the PID control parameter should be different from the case of single heater.
A P41 profiling controller is perfectly to meet the above requirements. The
system diagram is shown below:
11
12
78
28
3
Out1
4
Out2
Out3
Out4
P41
6 5 19 20 9 7 2 1
+
Fan
Aux. Aux.
Heater Heater
+
Main Heater Main Heater
UM0P411A
LC LC
LF LF
RUN
HLD
8
OFF
Oven
Recorder
14 +
15
17
EI
Figure 5.1 Figure 5.1
A Heat Treatment Oven A Heat Treatment Oven
Mains Mains
Supply Supply
ON