22
Connecting components
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© 2010 Thorlabs
Attention
An reverse poled TEC element may lead to thermal runaway and
destruction of the connected components.
See also ” Polarity check of the TEC element" as below.
1.6.9 Polarity check of the TEC element
Presettings
•
Connect TEC element and temperature sensor. The sensor must have good
thermal contact to the active surface of the TEC element.
•
Switch on the laser diode control system PRO8000 (-4) / PRO800.
•
Select the ITC8xxx module.
•
Select the correct type of sensor.
•
Set the appropriate value for I
MAX.
Polarity check of the TEC element
•
Observe T
ACT
(or R
ACT
) and switch on the module by pressing the key ”ON/OFF”.
If T
ACT
(or R
ACT
) runs away from T
SET
(or R
SET
), the TEC element is reverse poled.
Change polarity and repeat the procedure.
If T
ACT
(or R
ACT
) is oscillating around the value T
SET
(or R
SET
) the TEC element is
connected correctly, but the P-, I- and D-share values of the control loop are still
incorrect.
If T
ACT
(or R
ACT
) is settling properly to the value T
SET
(or R
SET
) the TEC element
has been connected correctly, the values for the P-, I- and D-share of the control
loop might still be improved.
(Refer to chapter 1.7.2, "PID adjustment" starting on page 25)
1.6.10 Connecting the status LED (not ITC8xxxDS15!)
To display the operating status of the temperature controller, a standard LED can be
connected between pin 1 and pin 8 of the TEC connector (see “Pin assignment TEC
connector”, page 19). The LED will light up if the output for the TEC current is
switched on.
Содержание ITC8 Series
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