JULABO SL-26 Heating Circulators - Manual (Page 53)

HL / SL
53
9.5.4. CoSpeed - extern
CoSpeed:
This parameter affects the temperature pattern only in case of external
control.
Possible parameters: 0 ... 5
°C
t
Setpoint
5
3
0
Int. temperature
Ext. temperature
During selftuning, the control parameters Xp, Tn,
and Tv of a controlled system are automatically
determined and stored. The time required for
tuning may vary depending on the controlled
system. This controller design allows protection of
sensitive objects requiring temperature control.
As soon as a co-speed factor is set, it is
considered in calculating the control parameters.
As shown in the diagram, tuning times are shorter
the higher the co-speed factor is, but overshoot
can occur in the internal system.
9.5.5. Control parameters – internal/external
Control parameters – internal/external
The control parameters preset at the factory are in most cases adequate
to achieve an optimal temperature pattern in the samples requiring
temperature control.
Each parameter may be manually set via the keypad if necessary to
allow optimal control performance.
Setting range:
internal / external
0.1 ... 99.9 K
Proportional range >Xp<
The proportional range is the temperature range below the setpoint
temperature value in which the control circuit reduces the heating power
from 100% to 0%.
Setting range:
internal / external
3 ...9999 s
Resetting time >Tn< (Integral component)
Compensation of the remaining control deviation due to proportional
control. An insufficient resetting time may cause instabilities to occur. An
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 overshoot 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.