Arroyo Instruments TECSource 5305, User Manual

Page: 34 / 44

Page 34 · 5300 Series TECSource User’s Manual
internal power supply will be adjusted down to minimize the thermal load inside
the instrument.
In some cases, power supply adjustments are not enough, and the instrument
will then reduce the drive current until the internal thermal load is within the
maximum allowable. In many cases, this will have little effect on the operation of
your application, but may slow the transition from one temperature to another.
However, there may be conditions where the reduced current actually prevents
the mount from achieving the desired operating temperature. The only solution
in this case is to increase the load voltage. The simplest method is to wire a
power resistor in series with the TEC to create additional voltage. Depending on
the voltage of your controller and application requirements, the value of the
resistor will vary, but is typically in the 0.5
Ω
to 1
Ω
range. Contact the factory for
additional support.
When in ITE mode, the current will not be limited, and an error will be generated
and the output turned off if operating outside the allowable range.
The graphs below illustrate the minimum voltage requirements for the standard
5305 , 5310 , and 5300-08-24 TECSource controllers. Custom configurations will
have a different profile.