Doc. 2135-D01 Rev E 7-20-2001
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Control LED for TEC ON mode
If an LED is connected between pin 1 and pin 5, as shown in fig 2.4, the LED lights up when the TEC current output
is switched on (TEC ON mode).
Fig. 2.4 TEC ON monitoring
Connecting the TEC element
Connect the thermoelectric cooler between pin 4 (TEC anode) and pin 5 (TEC cathode) of the DB9 (R5). The TEC
element must be connected in a way that a cooling effect occurs if pin 4 is positive with respect to pin 5.
Attention:
If the TEC module is connected with incorrect polarity, the TEC module may overheat and be
destroyed.
Check the TEC polarity as follows:
•
Turn on the TEC 2000 (refer to chapter 2.1).
•
Connect the temperature sensor to the plug "TE OUTPUT" (R5) (refer to connecting the temperature sensor).
•
Select a suitable current limit "ILIM" for the TEC element (refer to chapter 2.3.1).
•
Switch the LCD display to the measurement range "TSET" and set the desired set temperature with the front
panel adjustment knob (11) (refer to Fig. 2.1).
•
By pressing the “ENABLE” button (10), switch on the TEC 2000. The LED "ENABLE" (9) lights up.
•
Switch the LCD display to the measurement range "TACT".
If the TEC module is connected with correct polarity, the difference between the set temperature "TSET" and the
actual temperature "TACT" will decrease. If the control loop parameters are set properly (refer to chapter 2.3.4), the
actual temperature will be in accordance with the set temperature.
If the TEC module is connected with incorrect polarity, the difference between set temperature and actual
temperature will continuously increase. In this case, switch off the TEC current by pressing the “ENABLE” button
(9) and change the TEC module wiring on the DB9 (R5).
Connecting the temperature sensor
The TEC 2000 can be used with a standard thermistor or with an IC temperature transducer such as an AD590/592,
or LM335. The temperature sensor is selected with switch (R6) on the rear panel.
The LEDs (1) or (2) indicate the sensor selected by the switch (R6).
If no temperature sensor is connected or if the temperature sensor does not correspond to the sensor type selected
with switch (R6), the LCD display (3) indicates overflow when "TACT" measurement value is indicated and the LED
"OPEN CKT" (7) lights up in TEC OFF mode.
The temperature sensor is connected, depending on the used sensor type, via the DB9 "TE OUTPUT" (R5) on the
rear panel.
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