Burkert Type TAT002 - Manual (Page 12)

10 - 0911
english
2.6 Parameters
Explanation of the PID components:
• The proportional components act on changes within the band around
the set-value.
• The differential components influence the speed of temperature
changes.
• The integral components adds together all surfaces (time x tempe-
rature), that arise from the deviation of the actual value from the set-
value. The greater the deviation, the higher the effect.
NOTE • An increase of the proportional range results in a larger
remaining control deviation between the set-value and the
actual value.
• A significant reduction of the proportional range reduces
the control deviation, although the control behaviour will
become less stable.
• The derivative action time (differential time) affects the
output dependent on the speed of the temperature change.
An increase of the drivative action time reduces the
vibration tendency after system stabilisation, but can
generate higher vibration with larger deviations, however.
• An reduction of the integral range increases the effect
on the deviation between the set-value and the actual
value.
Control
Hy1 Hysteresis 1 Switch hysteresis of Set-value 1 with
positive or negative values. The default
range is dependent on the input type.
The parameter may not be entered as
zero. The control function is predefined
with S1C.
Hysteresis 2 Switch hysteresis of Set-value 2 with
positive or negative values (as Hy1).
The control function is predefined with
S2C.
Control type onF = ON/OFF db = not predefined!
Pid = PID; tt = not predefined!
Lowest set-value setting Set-value limits 1 for operator
Lowest set-value setting Set-value limits 2 for operator