16
+100%. Note: Max power out/Dead band/Cool and Heat gain are active and might affect the output
amplitude.
Algo Mode
The Algo mode is used to simulate "cool on”, “off" and "heat on" mode, similar to a thermostatic
controller. Dead-band setting turns off algo mode and Hysteresis turns on algo mode.
PID Mode
P, PI, PD, or PID mode will use all or selected parts of the PID regulator. Of course it is possible to
use PID mode and only set P, I or D constant to zero, but the possibility to change mode quickly
without changing the constants helps to trim the values for optimal use.
The picture shows the function of the PID regulator.
Output Block
The main output block handles the adjustments before the actual output signal.
St1
The set point temperature the regulator will control to. Range is -100 to 200°C.
Max power out
A limit can be specified to set a max output value. This function is always in effect. Valid range is
0 to 100%. Note that it is the average power that is reduced with PWM (Pulse Width Modulation), so
the peak voltage is still approximately the same as applied to the PR-59. This is why applied voltage
to the PR-59 should not be higher than Vmax of the load.
Dead-band
Specify a limit to the output control around zero. Any output lower than the value set in this field will
render 0% output. This is useful in order to avoid switching too fast between cooling and heating
mode in order to increase field life of the thermoelectric modules.
