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3 External Connections ITC8xxx

3.2.5 Polarity Check of the TEC Element

Pre-Settings

· Connect TEC element and temperature sensor. The sensor must be in good thermal contact

to the active surface of the TEC element.

· Switch on the PRO8000 (-4) / PRO800 system.

· Select the ITC8000 module.

· Select the correct type of sensor.

· Set the correct value for ITEC, MAX.

Polarity check of the TEC element

Observe TACT (or RACT) and switch on the module by pressing the key ”ON/OFF”

· If TACT (or RACT) runs away from TSET (or RSET), the TEC element is reverse poled. Change

polarity and repeat the procedure.

· If TACT (or RACT) is oscillating around the value TSET (or RSET), the TEC element is connected

correctly, but the P, I and D share values of the control loop are still incorrect. (Refer to

section PID Ajustment )

· If TACT (or RACT) is settling properly to the value TSET (or RSET), the TEC element has been

connected correctly, the values for the P-, I- and D-share of the control loop may still need

improvement.

3.2.6 Connecting the Status Display LED

To display the operating status of the temperature controller, a standard LED may be used

between pin 1 and pin 8. The LED will light up when the current output is switched on.

Note Not for ITC8000DS15!

THORLABS ITC8000 User Manual

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