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MESSTEC Power Converter GmbH
Operating Manual
TEC Controller
Document: 10100920OM
Revision: 1.1
Date: 10.10.2019
Page 46/71
By means of the PC-Software it is possible to set a maximum and a minimum
temperature. Then it is necessary to distinguish between two different transfer
modes:
Clipping
Slope Transformation
These modes are named "HW-Setpoint Boundary Mode" and can be set by
PC-Software.
8.1.1. HW-Setpoint Boundary Mode: Clipping
In this mode, the relationship between the HW-Setpoint-Voltage and the tem-
perature setpoint is not any longer linear for the whole range. Between min.
and max. temperature the relationship is like in basic mode. Below min. and
above max. temperature the transfer function is running horizontal (see solid
red line in figure 30 below).
Fig. 30: Clipping mode transfer function
Example (see figure 30 above):
Supposed, min. temperature is set to 20 °C and max. temperature is set to
30 °C by PC-Software then a HW-Setpoint-Voltage between 2 V and 3 V leads
to a temperature setpoint between 20 °C and 30 °C (arrows 2, 3 and 4).
HW-Setpoint-Voltages below 2 V will lead to 20 °C (arrow 1) and HW-Set-
point-Voltages above 3 V will lead to 30 °C (arrow 5).
For purpose of illustration, the basic transfer function is also shown in figu-
re 30 (dashed red line). It is apparent, that in between the two temperature
limits, the transfer function is conform to the basic transfer function. Below and