THORLABS ITC1 Series, Руководство по эксплуатации

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ITC1xx
4.5 Polarity Check of the TEC
Preconditions
·
Connect TEC element and temperature sensor (see section Temperature Controller ). The
sensor must have good thermal contact to the active surface of the TEC element.
·
Switch on the ITC1xx.
·
Select the correct type of sensor ( switch S3 ).
·
Set the appropriate value
1
) for I
TEC,LIM
, using the potentiometer P3 (measured at pin A9 of
ST1 ).
Polarity check of the TEC element
·
Adjust the temperature set point T
SET
or R
SET
using the potentiometer P4 (measured at pin
C11 of ST1 ) a few degrees away from the actual room temperature.
·
Observe T
ACT
or R
ACT
( ST1 pin C10 ) and switch on the module.
·
If T
ACT
or R
ACT
runs away from the set point, the TEC element is reverse poled. Change
polarity and repeat the procedure.
·
If T
ACT
or R
ACT
is oscillating around the set point, the TEC element is connected correctly,
but the P-, I- and D share values of the control loop need to be adjusted.
·
If T
ACT
or R
ACT
is settling properly to the set point, the TEC element has been connected
correctly, however the values for the P-, I- and D share of the control loop might still need
to be adjusted (Refer to section
PID Adjustment ).
1
) The total combined current for the ITC133 is limited by the total thermal dissipation loss.
When the standard heat sink is used, the total output current should be limited to 3 A (I
LD
+ I
TEC
£
3 A). Optimized cooling by fan or bigger heat sink allows 3 A LD and 3 A TEC at the same
time under the condition that the power supply provides 6.1 A.