3.3 Position proportional control of a ceramic kiln
3-9
Typical Control
Examples
3.3 Position proportional control of a ceramic kiln
The control method whereby a potentiometer is used to read the amount of opening of a valve and then
open or close the valve by means of an attached control motor is called position proportional control or on/
off servo control.
■ Application
To control a gas kiln using a position proportional control valve, select
the control valve control type and configure the instrumentation as
shown in the following example.
When there is a concern that sudden temperature
changes will damage or change the composition of an
object such as a ceramic work, the SP ramp function can
be used to limit the rate of change of the SP using the SP
ramp value and thereby cause the temperature to change
at a constant rate.
IN1
PV
+
-
SP SP ramp
Channel 1
Potentiometer
PID*
MV
OUT1
OUT2
SP
SP ramp
RUN
SP
Time
SP ramp
setting value
SP ramp in units of time
E5AR
E55A
(Recorder)
4 - 20 mA (transfer output)
Temperature sensor
Burner
26.9
1
Hint