JULABO CF41 Cryo-Compact Circulators - Manual (Page 39)

Cryo-Compact Circulators
39
Setting range:
internal / external
3 ...9999 s
Resetting time >Tn< (Integral component)
Compensation of the remaining control deviation due to proportional
regulation. An insufficient resetting time may cause instabilities to occur.
Excessive resetting time will unnecessarily prolong compensation of the
control difference.
Setting range:
internal / external
0 ... 999 s
Lead time >Tv< (Differential component)
The differential component reduces the control settling time. An insufficient
lead time will prolong the time required to compensate for disturbance effects
and cause high overshooting during run-up. An excessive lead time could
cause instabilities (oscillations) to occur.
Setting range:
0.1 ... 99.9 K
Proportional range >Xpu<
The proportional range Xpu of the cascaded controller is only needed for
external control.
Optimization instructions for the PID control parameters:
optimum setting
The heat-up curve reveals inappropriate control
settings.
Inappropriate settings may produce the following heat-up curves:
Xp too low Tv/Tn too low
Xp too high or Tv too high Tv/Tn too high or Xp too high