Operating Manual - John Morris Scientific

Menu functions
Dynamic:
°C
normal
temp. stability
This parameter affects the temperature pattern only in case
of internal control.
aperiodic
Possible parameters:
setpoint
normal –Allows for reaching the setpoint faster, but
overshooting of up to 5 % is possible.
°C
normal
t
Aperiodic – (factory setting)
Target temperature is attained without overshooting.
temp. stability
aperiodic
With both adjustments an adequate temperature
stability is reached after approximately the same time.
temperature ramp
t
CoSpeed:
This parameter affects the temperature pattern only in case
of external control.
Possible parameters: 0 ... 5
°C
Int. temperature
Ext. temperature
5
3
0
Setpoint
t
During selftuning, the control parameters Xp, Tn
and Tv of a controlled system are automatically
determined and stored. Depending on the
controlled system, time for tuning can be
unequally longer. This controller layout allows
protection of sensitive objects requiring
temperature application.
As soon as a co-speed factor is set, it is
considered for calculating the control parameters.
As shown in the diagram, tuning times become
shorter the higher the co-speed factor is, but
overshooting can happen in the internal system.
Control parameters – intern / extern
The control parameters preset in factory are in most cases adequate for
achieving an optimum temperature pattern for the samples requiring
temperature application.
Each parameter may be manually set via the keypad if necessary, to allow
optimum control performance.
Setting range:
internal / external
0.1 ... 99.9 K
Proportional range >Xp<
The proportional range is the range below the selected temperature value in
which the control circuit reduces the heating power from 100 % to 0 %.
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