Pid Controller Equipment - KPM PROCESS SENSORS METIS M308 User Manual

7.3.3 PID Controller Equipment

M3 and H3 pyrometers can optionally be equipped with an integrated PID controller. At this, the temperature
signal is converted into a control signal via a PID controller software. A setpoint value and the necessary PID
parameters are set to trigger a corresponding control value output. At the analog output 2, the control signal is
provided, via display and analog output 1 the current temperature reading is available (factory setting, assign-
ment can be changed in the pyrometer port settings, see
tings and Configuration).
button for the controller configuration.
A setpoint and the necessary PID control parameters are entered directly in the software and transferred to the
pyrometer by pressing the ENTER or tabulator key, control parameters also can be changed during running
control mode. Invalid value entries are automatically corrected to the next possible.
Control Parameters:
▪ Always visible parameters:
- Setpoint value: Setpoint specification.
- Ramp time (in 100 ms): The setpoint temperature will be
approached by increasing the temperature with a uniform
gradient of the temperature within the entered time (the
setpoint temperature in the grey field above can show
updated ramp temperatures if the buffer mode settings in the
data collection settings (see 7.3.2.4) are set to "with state in-
formation").
- Hold time: when reaching the desired value, the setpoint
value in can be maintained at the current value. The control
process stops automatically after the hold time is elapsed.
▪
Click the extension icon to open the grouped control
parameters.
▪ PID parameters:
- Proportional band Xp: The proportional band represents
the reciprocal of the gain of the controller (Entering 0.1-
1000%, 0.1 = highest gain, 1000 = lowest gain).
- Integral time Ti: The integral time constant represents a
kind of smoothing or delay.
|INFO|
Ti is a multiple of the sampling time. Therefore,
changes in the sample have an impact on this value.
- Derivative time Td: The derivative time constant slowdowns
the rapid rise to prevent overshooting (if, for example, the actual value has almost reached the target
value but still strong increases, Td slows a further increasing to prevent an overshoot).
|INFO|
Td is a multiple of the sampling time. Therefore, changes in the sample have an impact on this
value.
- Sampling time: Select how quick temperature values will be read out of the sensor. Select the parameter
depending on the inertia of the heating process
|INFO|
Ti and Td are a multiple of the sampling time. Therefore, changes in the sampling effect changes
in Ti and Td.
▪ Power adaptation:
- P-min: The minimum control output power defines the power set to the control output at least.
- P-max: The maximum control output limits the power to the entered value.
- P-zs: Limits the control output power as long as the beginning of the sensor's or pyrometer's temperature
range is reached. This is useful to avoid a too fast start of a heating process because the object
temperature is out of the pyrometer's temperature range.
- P dynamic: Limits the power, the control output can control suddenly (standard 100%).
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METIS M308 / M309 / M313 / M316 / M318 / H309 / H316 / H318 (12-pin)
An integrated PID controller is automatically detected by the software and activates the
6.3 Parameters / Settings and
Control window
Measured temp.
Setpoint display
Controller window
Setpoint specifi-
cation
Control parame-
ters
Automatically find
control values
Start / Stop con-
trol process
7.3.2 Device Set-