ILX Lightwave LDC-3700B Series - Setting Temperature Controller Limits

OPERATIONS
Operating the TE Controller from the Front Panel
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CHAPTER 2
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then release the SET switch. When the SET switch is released, the new value will be stored in non−
volatile memory.
At this point the sensor type is selected, the appropriate constants are entered and the temperature
control loop gain is set. Next, the display will be configured to read in the correct units for operation
in Constant Temperature mode. The enunciators next to the TEC display will indicate the display
mode corresponding to the switch pressed (
o
C will illuminate when the T push button is pressed).
The TEC DISPLAY section is used to select the displayed temperature, T, sensor value, R, or TE
module current, I
TE
. Press T for temperature and the display will indicate measured temperature in
°C. When the R switch is pressed, the display will show the measured thermistor resistance in KΩ,
the measured LM335 voltage in mV (not enunciated), or the measured AD590 current in µA (not
enunciated), depending on the position of the back panel SENSOR SELECT switch. When I
TE
is
pressed, the A enunciator will illuminate and the display will show measured TE module current in
amps. Likewise, if the SET switch is pressed (and R mode is selected), the display will show the
thermistor resistance set point value in KΩ, or the LM335 set point voltage in mV (not enunciated),
or the AD590 set point current in µA (not enunciated), depending on the position of the SENSOR
SELECT switch on the rear panel. If I
TE
is selected and the SET push button is pressed, the
instrument will display the TE module current set point in Amps.
Setting Temperature Controller Limits
The LDC−3700B Controller is capable of protecting your thermoelectric (TE) modules. The
Temperature Controller current limit function, LIM I
TE,
limits the controller’s output current so that the
instrument does not provide more current than your TE module can safely handle. During controller
operation, if the TEC current limit is reached, the TE CURRENT LIMIT error indicator (underneath
the TEC display) will flash. The TEC current limit is displayed in Amps.
Note, it is normal for the TE Current limit to be reached when the TEC output is first turned on.
Typically the TE current will be maximum (in limit) until the actual temperature is within a few
degrees of the set point.
To set the TE module current limit to 2 Amps, press the (PARAMETER) SELECT switch until the
LIM I
TE
indicator is lit. Press and hold in the SET switch while turning the ADJUST knob until 2.000
A is displayed on the TEC display. When the SET switch is released, this new value will be stored in
non−volatile memory.
T
E
LIM I
SAV
E
CONST
GAIN
LIM T
HI
TEC
LIM I
CAL PD
LIM I
LIM
P
RECA LL
SET
SELECT
PARA M ETE
R
LASER
TEC DISPLAY
T
R
I
TE
SET
TE
LIM I
SAV E
CONST
GAIN
LIM T
HI
TEC
LIM I
CAL PD
LIM I
LIM P
RECA LL
SET
SELECT
PARAM ETE
R
LASER
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