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MESSTEC Power Converter GmbH
Operating Manual
TEC Controller
Document: 10100920OM
Revision: 1.1
Date: 10.10.2019
Page 13/71
4.2. Electrical Setup for Control and Monitoring
In the following some generic wiring examples are shown.
The power supply, Peltier element and temperature sensor are wired in the same
way in all examples.
An Enable switch is wired to the HW ENABLE input in all examples. This is due to
the fact, that even if the ENABLE Mode is set to SW (PC-Software), it is still neces-
sary to activate the HW ENABLE input for safety reasons (see "Control Signals Digi-
tal X2"). It is not recommended, to replace the switch by a wire bridge.
A Reset switch is wired to the RESET input in all examples. In normal operation this
switch is namely not necessary. But in case of failure, the Reset switch is essential
to be able to clear errors and subsequently continue operation. Alternatively, if the
TEC-Controller is operated by PC-Software, there is also a Reset button available in
the GUI.
In the following, some sample applications are shown:
Figure 6
The internal setpoint potentiometer is applied. Therefore a simple wire bridge must
be installed.
Figure 7
An external setpoint potentiometer is installed. Please also note chapter "Wiring
examples for the analog input CA-SETPOINT".
Figure 8
The HW ENABLE input is set to High-active in the IO-configuration (PC-Software).
Therefore, the Enable switch is wired to +5V REFERENCE. In any case, a pullup or
rather pulldown resistor is not necessary.
Figure 9
The SETPOINT MODE is set to SW (software). Now, the temperature setpoint is
adjusted in the GUI of the PC-Software. Wiring of the HW SETPOINT input can be
omitted completely.
Figure 10
The output signals READY and STATUS are wired to external LEDs.
Figure 11
The output signals READY and STATUS are wired to external relays. They are po-
wered by a separate power supply. Make sure, the outputs are configured to OC
(open collector) in this case. Output sink current is max. 500 mA in OC mode.